Post on 11-Jan-2016
transcript
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