11-20-2016, 08:57 PM
First off, I’d like to mention the very fast delivery: ordered on Sunday, arrived on Wednesday (the Netherlands)! I’ve ordered two sensors for my first steps into domotica:
- CO2 monitor (CM1102, temperature+humidity+pressure (= BME280); no RF
- WiFi thermometer (temperature+humidity+pressure (= BME280)
The CO2 and humidity values are all looking good, however I’m having issues with the temperature measurements: both devices output too high values: in a 19C room, the CO2 monitor reads 22C and the WiFi thermometer 24C.
I wondered whether heat from other components would be the cause of this, so I’ve taken an infrared thermometer and checked the outside of the casing.
- CO2 monitor: 32C above the CO2 sensor, 21C above the temperature sensor
- WiFi thermometer: 24C above the WiFi chip, 22C above the temperature sensor
No significant difference in results between using the chrome configuration tool, or using Domoticz to read out the sensors. No difference between power sources (pc port, Sony charger, Anker charger). Taking the WiFi thermometer out of its casing seemed to slightly lower readings, but it's still too high. There's also very little variance in readings (~0.5C) despite room temperature going up and down.
Is there something wrong with my unit, or is it reading the temperature from the other components? I was planning on ordering more WiFi thermometers for each room, but being a few degrees to high with little variation makes them pretty useless.
- CO2 monitor (CM1102, temperature+humidity+pressure (= BME280); no RF
- WiFi thermometer (temperature+humidity+pressure (= BME280)
The CO2 and humidity values are all looking good, however I’m having issues with the temperature measurements: both devices output too high values: in a 19C room, the CO2 monitor reads 22C and the WiFi thermometer 24C.
I wondered whether heat from other components would be the cause of this, so I’ve taken an infrared thermometer and checked the outside of the casing.
- CO2 monitor: 32C above the CO2 sensor, 21C above the temperature sensor
- WiFi thermometer: 24C above the WiFi chip, 22C above the temperature sensor
No significant difference in results between using the chrome configuration tool, or using Domoticz to read out the sensors. No difference between power sources (pc port, Sony charger, Anker charger). Taking the WiFi thermometer out of its casing seemed to slightly lower readings, but it's still too high. There's also very little variance in readings (~0.5C) despite room temperature going up and down.
Is there something wrong with my unit, or is it reading the temperature from the other components? I was planning on ordering more WiFi thermometers for each room, but being a few degrees to high with little variation makes them pretty useless.