Microchip Segment - schmartboard.com · LEDs are just beginning to emerge as a viable alternative...

SchmartBoard 2010 MCU ChallengeMicrochip Segment

Project #: MP004

Matt Bommicino

Project Description:

Residential LED RGB Lighting System

LEDs are just beginning to emerge as a viable alternative to traditional arti�cial sources of light. This is exciting because the LED has the potential to o�er more �exibility than any other light source available. The manipulation of light coloring that was previously only available through hardware �ltering can be accomplished and changed on the �y.

This project aims to be a proof-of-concept which explores the use of high-brightness RGB LEDs as a primary source of ambient light in a home environment. The system is designed to give the user an unprecedented level of control over his lighting using both wire-less and wire line digital communication.

Table of Contents

1. System Overview

a. Block Diagram

b. Description

2. Main Controller

a. Picture & Wire Key

b. Design Description

c. Schematic

d. Ethernet Module Schematic

e. Bill of Materials

3. LED Board

a. Picture


c. Schematic

d. Bill of Materials

4. Wireless Remote

a. Picture


c. Schematic

d. Bill of Materials

5. Miscellaneous

a. PC LED Client Program

b. Modification of Microchip Application Libraries

c. Implementation details

802.

15 W

irel

ess

Home Router

LED

Co

ntr

olle

r

Lig

ht

Bo

ard

Lig

ht

Bo

ard

Lig

ht

Bo

ard

Ded

icat

ed R

emo

te

Computer

Smar

t P

ho

ne

2-W

ire

Bu

s

Ethernet

2-W

ire

Bu

s

2-Wire Bus

18

-36

V D

C

18

-36

V D

C

18-36V DC

Features

Main controller relies on Schmartboard

Implementation includes five fully dimmable 16M color capable LED modules

Cost optimized LED board design

LED modules communicate with controller via simple 2‐wire protocol

Lights can be controlled over Ethernet

Lights can be controlled via low‐cost 802.15.4 wireless

Each light is individually addressable and dimmable

Adjustment ability provided for mismatched color balance between LEDs

Active current monitoring and fault interruption capability

Smartphone client pages allows light control with a cell phone

Wireless capacitive touch Schmartboard–based remote with color GUI

Cross platform control utility communicates with TCP sockets

System Overview Description

The system consists of a main controller, one or more LED light boards, and several available

human interfaces. The primary function of the main controller it to accept communication from the

human interfaces and translate commands to 2‐wire bus commands. In addition, it controls and

monitors power being delivered to the LED boards. The bus is composed of 4 wires, two for power and

two for data. The 2‐wire bus is functionally equivalent to the I2C protocol with the exception of

increased allowable bus capacitance and reduced speed. Individual LED boards are assigned addresses

per the I2C protocol. Each LED board accepts 18‐36V DC and is individually responsible for accepting

commands from the controller and adjusting the brightness of each color of the LED via PWM.

The controller communicates with human interfaces via two interfaces, Ethernet and 802.15.4

wireless using the Microchip proprietary MiWi protocol. The MiWi interface is designed to

communicate with low cost purpose designed hardware peripherals. The Ethernet interface

communicates with existing computing devices. An HTTP server has been used to create a smart phone

interface. Communication with the PC client, a cross‐platform Adobe Air application, is achieved via a

custom protocol utilizing TCP sockets.

Main ControllerAccepts commands from human interfaces and forwards

those commands to the individual LED boards.

Power

Ground

2-Wire Bus

SPI Bus

Chip Select

Analog Sense

Bus Power Control

LCD Data Wires

RF Int/Reset

Wire Key

Main Controller Design Description

I chose the PIC18F27J13 primarily because of the large available flash memory of 128K, enough

to comfortable accommodate the Microchip TCP/IP library. Another import consideration was the

availability of two MSSP modules, allowing the use of hardware SPI for Ethernet and wireless and

hardware I2C for LED Board bus communication. Low level Ethernet communication is handled by the

Microchip ENC424J600 mounted on a custom module. 802.15.4 Wireless is implemented using the

handy MRF24J40MA ready to go module. On the protocol level, I chose the MiWi P2P protocol because

of the simple communication requirements of this application.

An external EEPROM stores the currently available LED Board addresses. Those addresses are

communicated to a client each time the client boots. The current voltage is sensed through a resistor

divider. The controller turns on and off the power to the 2‐wire bus using a p‐type MOSFET. When

power is flowing, current is sensed using a shunt resistor and current sense amplifier. The controller

constantly checks for over‐current conditions and removes the power to the LED Board bus when

appropriate. The voltage and current measurements can also be communicated to the clients for

information purposes. An attached LCD also communicates the current and voltage measurements in

addition to displaying the current IP address, MiWi channel, and signal strength.

Power for the controller is produced from the main DC voltage using an MC34063 based buck

converter. The MCU, Ethernet board, and wireless module operate at 3.3V. To accommodate this, the

voltage regulator on the Schmartboard was removed and the equivalent 3.3V version was installed.

SWC 1

SWE 2

TCAP 3GND4

-VIN5 VCC 6

IPK7

DRVC8U2

MC34063AD

VIN

F1

0.47

R8

D4 330uHL2

GND

GNDGND

1uH

L1

22uFC5

GNDGND

100pFC8

GND

3.8KR9

1.2KR5

GND

5V

IN1

4

OUT 3

GND

U3LD1117S33*

GND

1uFC6

GND

VCC

1 2

P1Header 2

VIN

GND

SDASCL

1234

P2

Header 4

GND

VOUT

1.5KR7 1.5K

R6

5V5V

Q1

FQU11P06

VIN0.05

R2

VOUT

D111V

Q2ZVNL120A

GND

PW_ON

IN-1

GND2

PRE OUT3

BUF IN4 OUT 5V+ 6NC 7IN+ 8U1

INA271

GND

VCC

I_SENSE

100nF

C1

10nF

C2

GND

GND

1nFC3

GND

10KR3

D36.8V

D26.8V

GNDGND

22KR1

1.3KR4

GND

V_SENSE

VOUT

GND

100uF

C4

100uFC7

*Mounted on Schmartboard

Power Supply and Analog Sense

INT 1

CS 2

SO 3

SI 4

SCK 5

VSS 6

VDD 7

U7

ENJ464J600 Module

MISOMOSISCK

GND

VCC

ENC464J600_CS

MCLR1 RA0/AN0/C1INA/ULPWU/RP0 2

RA1/AN1/C2INA/RP1 3

RA2/AN2/VREF-/CVREF/C2INB 4

RA3/AN3/VREF+/C1INB 5

VDDCORE/VCAP6

RA5/AN4/SS1/HLVDIN/RP2 7

VSS8

OSC1/CLKI/RA79

OSC2/CLKO/RA610

RC0/T1OSO/T1CKI/RP11 11

RC1/T1OSI/RP12 12

RC2/AN11/CTPLS/RP13 13

RC3/SCK1/SCL1/RP14 14

RC4/SDI1/SDA1/RP15 15

RC5/SDO1/RP16 16

RC6/TX1/CK1/RP17 17

RC7/RX1/DT1/RP18 18

VSS19

VDD20

RB0/AN12/INT0/RP3 21

RB1/AN10/RTCC/RP4 22

RB2/AN8/CTEDG1/REFO/RP5 23

RB3/AN9/CTEDG2/RP6 24

RB4/KBI0/RP7/SCL2 25

RB5/KBI1/RP8/SDA2 26

RB6/KBI2/PGC/RP9 27

RB7/KBI3/PGD/RP10 28

U5

PIC18F27J13T-I/SO*

MISOMOSI

SCK

GNDGND

GND

100nF*C15

VCC4.7uF*C11

4.7uF*C12

GND

ENC464J600_CS

SDASCL

PW_ON

I_SENSEV_SENSE

GND1

VCC2

VO3

RS4

R/W5

E6

DB07

DB18

DB29

DB310

DB411

DB512

DB613

DB714

A15

K16

LCD1

GND

VCC

GND

VCC

OUT 1C_FLY-3

IN2

GN

D4

C_FLY+5

TPS60402DBVTG4U4

GND

1uF

C13Cap

1uF

C14Cap

1uF

C10Cap

GNDGND

VCC 4.7K

R11 LCD_BIAS

LCD_BIAS

*Mounted on Schmartboard

1K*R10

VCC

100nF*

C9GND

S1

SW-PB*GND

LCD_RW

LCD_RSLCD_E

LCD_D0LCD_D1LCD_D2LCD_D3

LCD_D0LCD_D1LCD_D2LCD_D3

LCD_RS

LCD_ELCD_RW

RF_INT

RF_CSRF_RST

GND 1

RESET4 WAKE3 INT6

SDI5

SCK2 SDO7

CS8

NC 9

VIN 10

GND 11GND 12

U6

MRF24J40MA-I/RMGND

VCC

MISOMOSI

SCK

RF_CS

RF_RST

RF_INT

MCU Connections

VSSOSC1

OSC22

OSC13

VDDOSC 4

AD4 5

AD5 6

AD6 7

AD7 8

LEDB9 LEDA10

RBIAS 11

VDDPLL 12

VSSPLL13

VSSRX14

VDDRX 15

TPIN+ 16

TPIN- 17

VDDTX 18

VSSTX19

TPOUT+ 20

TPOUT- 21

VSSTX22

CLKOUT 23

INT/SPISEL24

AD8 25

AD9 26

AD10 27

AD11 28

AD12 29

AD13 30

AD14 31

PSPCFG032

VSS33

CS/CS34

EN/WR/SO35

RD/RW/SI36

SCK/AL37

AD0 38

AD1 39

AD2 40

AD3 41

VSS42

VCAP 43

VDD 44

U1

ENC424J600-I/PT

TPIN+TPIN-

TPOUT+TPOUT-

OSC2OSC1 TPO

UT+

TPOU

T-

TPIN+

TPIN-

TPIN+

TPIN-

TPOUT+

TPOUT-

49.9R8

49.9R9

49.9R3

49.9R5

VCC

GND

VCC 10R4

.01uF

C5Cap

GND

.01uF

C6Cap

GND

6.8nF

C3

Cap

6.8nF

C4

Cap

VCCGND

10uFC7

GND

.1uFC8

GND

VCC

6.8KR1

5.6KR2

GND

.1uFC9

GND

VCC

.1uFC10

GND

VCC

.1uFC11

GND

VCC

.1uFC12

GND

VCC

VCCVCCVCCVCC

GNDGNDGNDGNDGND

D1LED2

D2LED2

680R6

680R7

GND

GND

CS

SCK

SI

SO

INT

INT

VCC

100KR10

OSC2

OSC112

Y1XTAL 25Mhz

22pF

C1

22pF

C2

GND

GND

1234567

P1

Header 7

VCCGND

CS

SCKSISO

MH1

85 6 7

MH2

2 3 41

J1

43202-8924 GND

GND

INT

ENC424J600 Ethernet Module

Description Designator Quantity Value Source Part # Price Qty 1 Ext Price

SchmartBoard PIC MCU Board 1 Schmartboard.com 710‐0004‐01 15 15

SchmartBoard 2x2 Throughole Board 1 Schmartboard.com 201‐0001‐01 5 5

Ceramic Capacitor C1,C9, C15 1 100nF Mouser K104K15X7RF5TL2 0.06 0.06

Ceramic Capacitor C2 1 10nF Mouser K103M15X7RF53H5 0.05 0.05

Ceramic Capacitor C3 1 1nF Mouser K102K15X7RF5TH5 0.05 0.05

Polarized Capacitor (Radial) C4, C7 2 100uF Mouser UVR1H101MPD1TD 0.06 0.12

Capacitor C5 1 22uF Mouser UVR1H220MDD1TA 0.02 0.02

Ceramic Capacitor C6 1 1uF Mouser RPEE41E105M3M1C03A 0.26 0.26

Ceramic Capacitor C8 1 100pF Mouser K101K15C0GF53L2 0.06 0.06

Capacitor C10, C13, C14 3 1uF Mouser GRM21BR71A225KA01K 0.03 0.09

Capacitor C11, C12 2 4.7uF* Mouser FK24X5R0J475K 0.34 0.68

Zener Diode D1 1 11V Mouser N4741A,133 0.04 0.04

Zener Diode D2, D3 2 6.8V Mouser 1N957B 0.02 0.04

S h k Di d D4 1 M 1N5819 0 09 0 09Schottky Diode D4 1 Mouser 1N5819 0.09 0.09

Polyfuse F1 1 Mouser 60R065XU 0.21 0.21

Inductor L1 1 1uH Mouser 11R102C 0.31 0.31

Inductor L2 1 330uH Mouser RLB9012‐331KL 0.58 0.58

LCD 16X2 Character lcd LCD1 1 Mouser NHD‐0216K1Z‐NSW‐BBW‐L 11.7 11.7

P‐Channel MOSFET Q1 1 Mouser FQP17P06 0.8 0.8

N‐Channel MOSFET Q2 1 Mouser BS108ZL1G 0.28 0.28

Resistor R1 1 22K Mouser MF1/4LCT52R223J 0 05 0 05Resistor R1 1 22K Mouser MF1/4LCT52R223J 0.05 0.05

Resistor R2 1 0.05 Mouser OAR1R050FLF 0.77 0.77

Resistor R3 1 10K Mouser CCF5510K0FKE36 0.04 0.04

Resistor R4 1 1.3K Mouser MF1/4DCT52R1301F 0.05 0.05


Resistor R6, R7 2 1.5K Mouser CCF551K50FKE36 0.04 0.08

Resistor R8 1 0.47 Mouser NFR25H0004707JA500 0.25 0.25

Resistor R9 1 3 8K Mouser MF1/4DCT52R3831F 0 05 0 05Resistor R9 1 3.8K Mouser MF1/4DCT52R3831F 0.05 0.05

Resistor R10 1 1K* Mouser CCF551K00FKE36 0.04 0.04


Current Sense Amplifier U1 1 Mouser INA271 1.52 1.52

DC‐to‐DC Converter Control Circuit U2 1 Mouser MC34063AP 0.61 0.61

500mA, Very Low Drop (0.45V) Voltage Regulator U3 1 Mouser LD1117S33 0.51 0.51

Switchcap Voltage Inverter U4 1 Mouser TPS60402DBVTG4 1.35 1.35

PIC18F27J13 U5 1 Microchip PIC18F27J13T‐I/SO 3.41 3.41PIC18F27J13 U5 1 Microchip PIC18F27J13T‐I/SO 3.41 3.41

MRF24J40MA RF Module U6 1 Microchip MRF24J40MA‐I/RM 9.95 9.95

ENC464J600 Module

Capacitor C1, C2 2 22pF Mouser C0805C220J1GACTU 0.04 0.08

Capacitor C3, C4 2 6.8nF Mouser 140‐CC501B682K‐RC 0.04 0.08

Capacitor C5, C6 2 .01uF Mouser C2012X7R1H103K 0.04 0.08

Capacitor C7 1 10uF Mouser GRM21BC81A106KE18L 0.05 0.05Capacitor C7 1 10uF Mouser GRM21BC81A106KE18L 0.05 0.05

Capacitor C8, C9, C10, C11, C12 5 .1uF Mouser C0805C104M5UAC7210 0.04 0.2

Green LED D1 1 Mouser 598‐8160‐107F 0.1 0.1

Orange LED D2 1 Mouser 598‐8120‐107F 0.1 0.1

Pulse Ethernet Jack W/ Magnetics J1 1 Mouser J00‐0061NL 3.9 3.9

Resistor R1 1 6.8K Mouser CRCW08056K80FKEA 0.05 0.05

Resistor R2 1 5.6K Mouser CRCW08055K60FKEA 0.05 0.05

Resistor R3, R5, R8, R9 4 49.9 Mouser 292‐49.9‐RC 0.04 0.16, , ,

Resistor R4 1 10 Mouser 292‐10‐RC 0.04 0.04

Resistor R6, R7 2 680 Mouser 260‐680‐RC 0.04 0.08

Resistor R10 1 100K Mouser 292‐100K‐RC 0.04 0.04

Stand‐Alone 10/100 Ethernet Controller with SPI or Parallel InterU1 1 Microchip ENC424J600‐I/PT 3.58 3.58

Crystal Y1 1 Mouser ABLS‐25.000MHZ‐B4‐F‐T 0.43 0.43

Total 63.24

LED BoardsAccepts commands from main controller and sets each element

of the RGB LED to the appropriate brightness using PWM

LED Board Design Description

The LED board is designed to drive a 3W common cathode RGB LED. The most influential

factor on the design of the LED board was cost. A reasonable setup requires multiple LED boards. I

wanted that to be as practical as possible and therefore I was aiming for a BOM of $10.00 in single

quantities (not including the LED itself). Ultimately, I ended up at $11.45, but I surmise that careful

shopping could easily drop it below the 10$ point.

A PIC16F1823 MCU is used to interpret bus commands from the controller, perform PWM

brightness control, and use PWM to provide a reference voltage that sets the current flow through the

LED. The PIC uses the hardware I2C peripheral operating in slave mode. The board will respond to its

address or the general call address. The PIC is powered from an LM317 regulator. The tight budget

eliminated purpose‐designed LED driving ICs from consideration. The board consists of two MC34063

switching regulator circuits. One produces 2.8V for the red element and the other produces 3.8V for

the green and blue elements. The voltages are fed into simple individual current‐mode LDO regulators

constructed from discreet components. Each regulator uses two op‐amps on a single MCP6L02 IC. The

first op‐amp references and amplifies the sense voltage. The second op‐amp is used in a positive

feedback configuration to pull current from the base of a PNP transistor until the sense voltage

matches the reference voltage generated by the PIC16F1823 MCU.

Each color of an RGB LED is an individual element; therefore, some type of blending device is

required to eliminate perceivable color separation. To accomplish this, Plexiglas was sanded then cut

into 2.5” x 3.0” rectangles. The LED board is mounted on top of an aluminum base and the Plexiglas is

attached directly above the LED. A flat piece works well because the edges of the Plexiglas extend

beyond the approximately 160 degree emitting angle of the LED.

The MCU is programmed to follow serial I2C style commands in the following format:

First Byte Second Byte Third Byte

LED Board Address Command Code Parameter

The following command codes are available

Command Code Description Parameter Description

2 Set red brightness from 0 to 255 The brightness (0 to 255)

3 Set green brightness from 0 to 255 The brightness (0 to 255)

4 Set blue brightness from 0 to 255 The brightness (0 to 255)

5 Set the brightness of all colors The brightness (0 to 255)

12 Set the default red brightness, this will be the brightness at power‐on.

The brightness (0 to 255)

13 Same as above for green The brightness (0 to 255)

14 Same as above for blue The brightness (0 to 255)

32 Set red scale – all brightness commands will be scaled according to this value. This is used to normalize different LED boards with varying coloring. This Must be followed by confirmation.

The Scale value to scale the brightness by (1 to 255). If the scale value is set at 200, issuing command 2 with 255 will actually result in a 200 value.

42 The same as above but must immediately follow command 32 for the scale to be saved

Same as above

33 Same as 32 but for green

43 Same as 42 but for green

34 Same as 32 but for blue

44 Same as 42 but for blue

223 Set the I2C address. This must be performed when there is only one LED board on the bus. The general call address can be used. Must be immediately followed by a confirmation.

The desired I2C address

23 Same as above but must immediately follow for a successful save.

Same as above

245 Set the PWM value for the reference voltage. Must be followed by confirmation command.

The PWM value (1 to 100)

45 Confirm PWM value set. Same as above.

Issuing a read (I2C address + 1) allows the reading of three bytes. The first is the current red value, the

second is the current green value, and the third is the current blue value.

SWC

1

SWE

2

TCA

P3

GN

D4

-VIN

5V

CC6

IPK

7

DRV

C8

U2

MC3

4063

AD

GN

D

36V 10

0pF

C3

GN

D

36V

0.33R3

FB

D1

Scho

ttky

GN

D

56U

h

L2

470u

F

C4

GN

D

1uH

L3

100u

F

C5

GN

D

VG

B

3KR1

1.5K

R2G

ND

FB

SWC

1

SWE

2

TCA

P3

GN

D4

-VIN

5V

CC6

IPK

7

DRV

C8

U3

MC3

4063

AD

GN

D

36V

200p

FC8

GN

D

36V

0.20R8

FB2

D2

Scho

ttky

GN

D

100u

H

L4

470u

F

C9

GN

D

1uH

L5

100u

F

C10

GN

D

VR

ED

2.2k

R6

1.8KR7

GN

DFB2

36V

220u

F

C6

GN

D

IN1

OU

T2

OU

T3

4

NC

5O

UT

6

OU

T7

NC

8

AD

J

U1

LM31

7LD

36V 10

0nF

C210

0nF

C1

VC

C

270

R4 820

R5

1uH

L1

GN

D

GN

D

GN

D

VD

D1

RA5

2

RA4/

AN

33

MCL

R/R

A3

4

RC5

5

RC4

6

RC3

7RC

28

RC1

9RC

010

RA2

11RA

1/IC

SPC

LK12

RA0/

ICSP

DA

T/D

ACO

UT

13V

SS14

U4

PIC1

6F18

23

SCL

SDA

RPW

MG

PWM

BPW

M

GN

D

100n

F

C7

MCL

R

PGD

PGC

1 2 3 4 5

P2M

CLR

PGD

PGCV

CC

1234

P1

Header 4

36V

GN

D

SCLSDA

VC

C

100n

FC1

4

GN

D

36V

MCLR

VC

C22K

R31

REF_

PWM

REF_PWM 1KR30

VREF

F1 60R0

65X

U

SCL

SDA 2

1

3

D4

CM12

19-0

2

GN

D

Pow

er C

onve

rsio

n &

MCU

3 21

84

U5A

756

8 4

U5B

VG

B Q1

TIP4

2

0.20

R15

4.7K

R12

4.7K

R18

22K

R21

22K

R9

GN

D

GN

D

VC

C

22K

R24

Q4

GN

D

GPW

M

470

R27

3 21

84

U6A

756

8 4

U6B

VG

B Q2

TIP4

2

0.20

R16

4.7K

R13

4.7K

R19

22K

R22

22K

R10

GN

D

GN

D

VC

C

22K

R25

Q5

GN

D

BPW

M

470

R28

3 21

84

U7A

756

8 4

U7B

VRE

D Q3

TIP4

2

0.18

R17

4.7K

R14

4.7K

R20

22K

R23

22K

R11

GN

D

GN

D

VCC

22K

R26

Q6

GN

D

RPW

M

470

R29

100n

FC1

3

VC

C

GN

D

100n

FC1

1

VCC

GN

D

100n

FC1

2

VC

C

GN

D

VREF

VREF

VREF

P3 Gre

en A

node

P4 Blue

Ano

de

P5 Red

Ano

de

P6 LED

Kat

hode

GN

D

100n

F

C15

100n

F

C16

Cap

100n

F

C17

GN

D

GN

D

GN

D

GN

D

GN

D

GN

D

LED

Cur

rent

Reg

ulat

ion

& P

WM

Top

Laye

rBo

ttom

Lay

erCo

mpo

nent

Pl

acem

ent

Description Designator Qty Value Source Part # Price Qty 1 E Price Qty 1 Price Qty 1K E Price Qty 1K

Ceramic Cap

C1,C2, C7, C11, C12,

C13, C14, C15, C16,

C17 9 100nF Mouser C0805C104M5UAC721 0.02 0.18 0.01 0.09

Ceramic Cap C3 1 100pF Mouser GRM2165C2A101GA0 0.03 0.03 0.01 0.01

Solid Aluminum SMD Cap C4, C9 2 470uF Mouser UUR0J471MNL1GS 0.11 0.22 0.096 0.192

Tantatulum Cap C5, C10 2 100uF Future 293D107X06R3C2TE3 0.31 0.62 0.184 0.368

Solid Aluminum SMD Cap 50V C6 1 220uF Mouser EMVA500ADA221MJA 0.35 0.35 0.245 0.245

Ceramic Cap C8 1 200pF Mouser GRM2165C1H201JA01 0.09 0.09 0.023 0.023

Schottky Diode D1, D2 2 Mouser CD214A‐B130LF 0.11 0.22 0.081 0.162

2 Channel 4pF TVS / ESD ProtectorD4 1 Mouser CM1219‐02SO 0.27 0.27 0.18 0.18

Polyfuse 60V 0.65A F1 1 Future 60R065XU 0.21 0.21 0.21 0.21

Inductor L1, L3, L5 3 1uH Mouser GLFR2012T1R0M‐LR 0.3 0.9 0.125 0.375

Inductor L2 1 56Uh Mouser SRR1208‐560YL 0.84 0.84 0.43 0.43

Inductor L4 1 100uH dipmicro.com DE1714 0.56 0.56 0.387 0.387

PNP Power Transistor Q1, Q2, Q3 3 Future TIP42 0.23 0.69 0.23 0.69

N Mosfet Q4, Q5, Q6 3 Mouser PMV56XN 0.13 0.39 0.11 0.33

Resistor R1 1 3K Mouser 292‐3.0K‐RC 0.04 0.04 0.018 0.018

Resistor R2 1 1.5K Mouser 292‐1.5K‐RC 0.04 0.04 0.018 0.018

Resistor R3 1 0.33 Future RL1220S‐R33‐F 0.04 0.04 0.04 0.04

Resistor R4 1 270 Mouser 292‐267‐RC 0.04 0.04 0.018 0.018

Resistor R5 1 820 Mouser 292‐825‐RC 0.04 0.04 0.018 0.018

Resistor R6 1 2.2k Mouser 292‐2.21K‐RC 0.04 0.04 0.018 0.018

Resistor R7 1 1.8K Mouser 292‐1.82K‐RC 0.04 0.04 0.018 0.018

Resistor R8, R15, R16 3 0.20 Mouser 73L3R20J 0.11 0.33 0.048 0.144

Resistor

R9, R10, R11, R21,

R22, R23, R24, R25,

R26, R31 10 22K Mouser 292‐22.1K‐RC 0.04 0.4 0.018 0.18

Resistor

R12, R13, R14, R18,

R19, R20 6 4.7K Mouser 292‐4.75K‐RC 0.04 0.24 0.018 0.108

Resistor R17 1 0.18 Future RL1220S‐R18‐F 0.25 0.25 0.25 0.25

Resistor R27, R28, R29 3 470 Mouser 292‐475‐RC 0.04 0.12 0.018 0.054

Resistor R30 1 1K Mouser 292‐3.0K‐RC 0.04 0.04 0.018 0.018

LM317 Adjustable Voltage Reg U1 1 Mouser LM317LBDG 0.49 0.49 0.235 0.235

DC‐to‐DC Converter Control CircuiU2, U3 2 Mouser MC34063ADRJR 0.76 1.52 0.262 0.524

Microchop MCU U4 1 Microchip PIC16F1823‐I/ST 1.19 1.19 0.91 0.91

85 µA Dual Op Amp U5, U6, U7 3 Mouser MCP6L02T‐E/MS 0.34 1.02 0.24 0.72

Total 11.45 Total 6.983

Wireless RemoteCommunicates with people via a capacitive touch interface and

relays commands to the main controller.

Remote Control Design Description

The LED remote communicates with the controller via its 802.15.4 wireless interface. Control is

achieved using capacitive touch buttons, a capacitive touch slider, and a Nokia 6100 LCD module which

was acquired on eBay. The remote features a 64K flash PIC18LF26K22 mounted on a Schmartboard and

housed along with the LCD and capacitive touch board inside a Bud hh‐3570‐g enclosure. The label was

created with an inkjet. The MCU was chosen primarily because almost every pin has the ability to

operate as a capacitive touch channel, this provided excellent design flexibility. Physical RF

communication is performed by the MRF24J40MA module which is attached to the SPI bus. The remote

is can be awoken from sleep with a single hardwired button which activates an external interrupt. The

remote can be put to sleep the same way or will go to sleep automatically after a timeout period.

The remote uses 4 AA batteries wired in a series‐parallel configuration producing a fully charged

voltage of about 3.1V and lasting (with alkaline) for about 5400mAH. A custom power board accepts the

power from the batteries and produces 3.3V through an MC1640 boost regulator, allowing consistent

operation until the batteries are completely drained. A second boost regulator produces 6V for the LCD

module which it uses for its series‐wired LED backlight. Since the PIC has the ability to operate down to

1.8V, the boost regulator is shut‐off in sleep modes for minimum power consumption. Initial active

current is about 100mA and sleep current is less than 20uA. Battery life should exceed 40 hours of active

usage and 20 years of standby time. The input voltage regulator on the Schmartboard was removed

because of the need for low quiescent current in sleep mode.

GND 1

RESET4 WAKE3 INT6

SDI5

SCK2 SDO7

CS8

NC 9

VIN 10

GND 11GND 12

U1

MRF24J40MA-I/RM

MCLR1

RA0/AN02

RA1/AN13

RA2/AN24

RA3/AN35

RA46

RA5/AN47

VSS8

RA79

RA610

RC011

RC112

RC2/AN1413

RC3/AN1514 RC4/AN16 15RC5/AN17 16RC6/AN18 17RC7/AN19 18VSS 19VDD 20RB0/AN12 21RB1/AN10 22RB2/AN8 23RB3/AN9 24RB4/AN11 25RB5/AN13 26RB6 27RB7 28U2

PIC18LF26K22*

1KR1

VCC

100nF*

C1GND

S2

SW-PB*GND

VCC

GND

RF_CSMOSIMISOSCK

RF_INT

RF_RST

RF_INT

RF_CSRF_RST

MISOMOSI

SCKLCD_EN

BOOST_ENPWR_BTNRED_KEY

GREEN_KEY

BLUE_KEY

POWER_KEY

SELECTALL_KEYYEK_ODNUYEK_ENOTCELES

MAINTENENCE_KEYSLIDER1SLIDER2LCD_RES

LCD_CS

LCD_DATALCD_CLKGND

GND

VCC

100nF*

C2GND

RSTDATCLKCS

P2

To LCD Module

LCD_RES

LCD_CS

LCD_DATALCD_CLK

LCDVCCGNDBST

P3

To Power Board

BOOST_EN

LCD_ENVCC

GND

1234567891011

P1

To Cap Touch BoardGND

RED_KEYGREEN_KEYBLUE_KEYPOWER_KEY

SELECTALL_KEYUNDO_KEY

MAINTENENCE_KEYSLIDER1SLIDER2

SELECTONE_KEY

*Mounted On Schmartboard

S1

SW-PB*PWR_BTN

GND

MCU Connections

Vfb1

Sgnd2

Pgnd3

EN4 SW 5

Voutp 6

Vouts 7

Vin 8U1

MCP1640C-I/MC-ND

SW1

GND2

FB3 EN 4

Vin 5U2

TPS61041

VBat

2.2uF

C5GND

LCD_EN

D1

D Schottky

4.7uH

L3

Inductor

10uFC6

GND

GND

12

P4

To LCDLCD_V+

LCD_V+

680KR3

LCD_V-

LCD_V-

GND

LCD_EN

GND

BOOST_EN

1234

P3

To SchmartBoard

VDD

GND

LCD_EN

BOOST_EN

VBat

4.7uH

L1Inductor

2.2uF

C1GND

10uF

C3GND

1uH

L2Inductor

GND1uF

C4VDD

VOUT

VO

UT

560KR1

330KR2

GND

10pFC2

GND

GND

P1

To Battery +

P2

To Battery -

Q1

NTR3162

VBat

Q2

Q3

LCD_V+

LCD_V-160KR4

Power Supply Board

Description Designator Quantity Value Source Part # Price Qty 1 Ext Price

SchmartBoard PIC MCU Board 1 Schmartboard.com 710‐0004‐01 15 15

Nokia LCD Module 1 SparkFun LCD‐08600 35 35

MRF24J40MA RF Module U1 1 Microchip MRF24J40MA 9.95 9.95

Ceramic Capacitor C1, C2 2 Mouser C0805C104M5UAC7210 0.02 0.04

PIC18LF26K22 U2 1 Microchip PIC18F26K22‐I/SO 2.66 2.66

Tact Switch S2 1 Mouser MJTP1234 0.26 0.26

Bud Plastic Enclosure 1 Mouser HH‐3570‐G 7.3 7.3

Power Board

Ceramic Capacitor C1, C5 2 2.2uF Mouser GRM21BR71A225KA01K 0.03 0.06

Ceramic Capacitor C2 1 10pF Mouser C0805C100J5GACTU 0.06 0.06

Ceramic Capacitor C3, C6 2 10uF Mouser GRM21BC81A106KE18L 0.05 0.1

Ceramic Capacitor C4 1 1uF Mouser GRM21BR71A225KA01K 0.03 0.03

Schottky Diode D1 1 Mouser PMEG2005CT 0.09 0.09

Inductor L1, L3 2 4.7uH Mouser GLCR2012T4R7M‐HC 0.36 0.72

Inductor L2 1 1uH Mouser LQM21PN1R0MC0D 0.34 0.34

P Mosfet Q1 1 Mouser NTR3162 0.12 0.12

N Mosfet Q2, Q3 2 Mouser PMV56XN 0.13 0.26





Boost Converter IC U1 1 Mouser MCP1640C‐I/MC‐ND 0.66 0.66

Boost Converter IC U2 1 Mouser TPS61041DBVR 2.04 2.04

Total 74.85

PC LED Client

This desktop program allows �ne control of the LED Boards connected to the bus. The program was created using the Adobe open source Flex framework. It runs on the Air platform, which is basically a desktop version of �ash. It is a multi-os interpreted platform, much like Java. I chose it because there are several provisions of the platform that allow for rapid development. I have only tested the program on Windows but it should also run on Mac OS X and Linux. The above screenshot shows the Color Wheel. Holding down the mouse and scrubbing around the wheel changes the color of the LEDs in real time.

On the color temperature tab, the controls are designed to emulate a variety of di�erent light sources. The user can mimic the light produced by candles, midday sun, or even a black light.

The color values are based on work by James Hastings-Trew that I found pub-lished at :

http://planetpixelemporium.com/tutorialpages/light.html

The author claims to have simply eyeballed the color values using 3D rendering software. I have found them to feel much more accurate than the colors achieved through calculations.

This is the maintenance page. Here is where voltage and current values can be monitored. The boxes on the left allow addition and deletions from the EEPROM of the main controller that stores the addresses of the available LED boards. Changes here will be re�ected in the other client interfaces because they query the main control-ler upon connection.

The utility for setting scale values at the bottom is used for equalizing di�erent LED boards whose colors may be slightly out sink with each other (i.e. from di�erent bins).

Modification of Microchip Application Libraries

Some files in the Microchip Application Library had to be modified to accommodate my configuration.

For this reason, my source files include the applicable libraries in their entirety. Use, distribution, or

modification requires that you agree to Microchip’s licensing terms. An overview of the changes is listed

here.

MiWi Library and MRF24J40 transceiver driver:

The library was not compatible with the TCP/IP stack. Both libraries used a function entitles

TickGet and both libraries wanted control of Timer 1. A find and replace was performed and all instances

of TickGet in the MiWi library were renamed to MiTickGet. Timer 1 was set up identically in both

libraries therefore the conflict only involved the interrupt routine. The MRF24J40 driver uses both

interrupt routines. The low priority interrupt was moved out of the MRF24J40 driver file and into the

main routine were both the tick routines for the TCP/IP stack and MiWi stack are called. The final

problem was the inability of the MRF24J40 driver to use the second hardware SPI. The MSPI.c driver was

changed to used register names defines in hardwareprofile.h instead of hardcoded register names to

solve that issue.

ENC424/624J600 Driver:

The TCP/IP stack would not retrieve an IP from my router via DHCP until I added a 2 second

delay directly after the reset of the ENC424J600. I didn’t investigate this further. I would guess it has

something to do with my particular network setup or my particular hardware implementation of the

ENC424J600, possibly the lack of a hardware reset line. This was the only change required to the TCP/IP

stack.

mTouch Capacitive Touch Library:

The PIC18LF26K22 is brand new and the cap touch library did not yet support it. I added the new

channels (previously topped out at 13) to the header files. I made changes to the ADC routines to

support different register names, notably to accommodate the ANSEL registers instead of the older

ANCON registers. I added a new udata section to mTouchCap_PIC18_CTMU_Physical.c because the new

ADC channel support caused it to exceed the 256 byte frame limitation. Finally, I made the optional

addition of a function pointer inside the DirectKey struct that gets called when the direct key is pressed,

making event implementation bit easier.

Implementation Details

The controller has been mounted out of site in the attic. Ethernet is connected and a strong wireless signal is achievable from this location.

Five LED boards have been placed on a ledge that separates the kitchen and the living room. Five 3W LEDs make a modest 15W setup. Although the LEDs were intended for “mood lighting” they provide a reasonable amount of ambient light to a large room. The LEDs are close to the white ceiling, providing a good surface to re�ect and scatter the light.

A picture taken without �ash at night. The installed LED Boards serve as the only light source.

Microchip Segment - schmartboard.com · LEDs are just beginning to emerge as a viable alternative...

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