Temperature sensing with low cost high frequency probes trial results

Dr Scott Mills

Dr Dane ThomasDr Peter Hayman

Compatible with rechargeable 3.7 V Lithium Ion batteries

1 WattSolar panel

Voltage regulator and charger control

ATmega328P8bit32 kB Flash1 kB EEPROM2 kB RAM20 MHz

CR2032 Lithium Ioncoin battery backup for RTC

Temperature corrected Real Time Clock

4 GB micro SDStorage

Price In case $68.90

DS18B20

Range -55 to +125˚CAccuracy ±0.5 ˚C from -10 to 125˚CResolution 0.065˚C at 12-bit

1-Wire®

Target 0.1˚C resolution with ±0.1 ˚C accuracy

1-Wire parasitic power modedozens of sensors can be driven and accessed on a single wire

Kent Town temperature sensor trial

GoldStandard

Experimental Sensor 4

Industry Standard 8 9

BOM Sensor

LowCost

TinyTag

Stevenson Screen

BeehiveScreen

NoScreen

Temperature Sensor

54.9%

19.3%

placed in the BOM Stevenson Screen

n = 59,165

GoldStandard

High Precision ExperimentalSensor

Exhibits Thermal Lag

Industry Standard 9

BOM Sensor

LowCost

TinyTag

Stevenson Screen

BeehiveScreen

NoScreen

GoldStandard

High Precision Higher DaytimeLower Nighttime

Thermal LagHigher DaytimeLower Nighttime

+Thermal Lag

Experimental Sensor

BOM Sensor

LowCost

TinyTag

Stevenson Screen

BeehiveScreen

NoScreen

GoldStandard

High Precision Higher DaytimeLower Nighttime

Thermal LagHigher DaytimeLower Nighttime

+Thermal Lag

Challenging Results

BOM Sensor

LowCost

TinyTag

Stevenson Screen

BeehiveScreen

NoScreen