iButton technology - john yumbya
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IBUTTON TECHNOLOGY John Yumbya
description
As part of one of our collaboration projects we used the iButton technology to collect weather information in farmers' fields in Kenya and Tanzania. Project: Linking genetic vulnerability to loss of resilience to adapt to climate change, http://www.abcic.org/index.php/programs/climate-change/linking-genetic-vulnerability-to-loss-of-resilience
Transcript of iButton technology - john yumbya
IBUTTON TECHNOLOGY
John Yumbya
Introduction •The challenge is to collect detailed weather data, spatially
and temporally
•Available weather stations and data loggers are fairly
expensive
•More simple environmental sensors are now available in the
market
•They are less costly, can be easily replaced when lost, and
can be placed in less accessible areas such as in farmer’s fields
What is an Ibutton? •A computer chip enclosed in a
16mm thick stainless steel can
•Developed by Maxim Integrated
Components required for recording
data with iButtons •Data logger iButtons - DS-1923
Hygrochron
•PVC pole - to hold the iButton in the field.
•A computer
•Blue Dot Receptor + 1-Wire Adaptor
•A reader - TDHC 400b Handheld
Thermochron Downloader
•Software to interface iButton devices to
computers
DS1923 Hygrochron iButton
Device •Temperature and/or humidity logger
•Rugged
•Self-sufficient system - measures and records the result in a
protected memory section
•Recording is done at a user-defined rate.
•A total of 8,192 8-bit or 4,096 16-bit readings taken at
equidistant intervals ranging from 1s to 273 hrs can be stored.
DS1923 Hygrochron iButton
Device – Conti… •512 bytes of SRAM for storing application-specific
information, 64 bytes for calibration data.
•Mission to collect data can be programmed to begin
immediately, after a user-defined delay, or after a
temperature alarm.
•Access to the memory and control functions can be
password-protected
•Lithium-metal batteries
Application of iButton technology
in our projects
Hombolo Wote
Nyando
Hombolo
Nyando
0
20
40
60
80
100
120
0
5
10
15
20
25
30 1/2
4/2
014
1/2
6/2
014
1/2
8/2
014
1/3
0/2
014
2/1
/2014
2/3
/2014
2/5
/2014
2/7
/2014
2/9
/2014
2/1
1/2
014
2/1
3/2
014
2/1
5/2
014
2/1
7/2
014
2/1
9/2
014
2/2
1/2
014
2/2
3/2
014
2/2
5/2
014
2/2
7/2
014
3/1
/2014
3/3
/2014
3/5
/2014
3/7
/2014
3/9
/2014
3/1
1/2
014
3/1
3/2
014
3/1
5/2
014
3/1
7/2
014
3/1
9/2
014
3/2
1/2
014
3/2
3/2
014
3/2
5/2
014
3/2
7/2
014
3/2
9/2
014
3/3
1/2
014
4/2
/2014
Avera
ge h
um
idit
y
Avera
ge t
em
pera
ture
Date
Average humidity and temperature at
Mkoyo
Average of Temperature Average of Humidity
Hombolo
Nyando
0
5
10
15
20
25
30
35
40
45 1/2
4/2
014
1/2
6/2
014
1/2
8/2
014
1/3
0/2
014
2/1
/2014
2/3
/2014
2/5
/2014
2/7
/2014
2/9
/2014
2/1
1/2
014
2/1
3/2
014
2/1
5/2
014
2/1
7/2
014
2/1
9/2
014
2/2
1/2
014
2/2
3/2
014
2/2
5/2
014
2/2
7/2
014
3/1
/2014
3/3
/2014
3/5
/2014
3/7
/2014
3/9
/2014
3/1
1/2
014
3/1
3/2
014
3/1
5/2
014
3/1
7/2
014
3/1
9/2
014
3/2
1/2
014
3/2
3/2
014
3/2
5/2
014
3/2
7/2
014
3/2
9/2
014
3/3
1/2
014
4/2
/2014
Tem
pera
ture
(0C
)
Date
Max and Min Temperature at Mkoyo
Min of Temperature Max of Temperature
Advantages of iButtons
•Very easy to use and convenient for users
•Portable and wearable.
•Ruggedness
•Durable
•Water proof.
Disadvantages of iButtons
•Compared to true weather stations, iButtons are less
accurate
•Very easy to get lost
Thank you
