temperature sensing with low cost high frequency probes trial results dr scott mills dr dane thomas...

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