Test Programme for this exercise is located here....
https://technocoma.blogspot.com/p/tes...



After receiving multiple requests and information pertaining the the BMe280 sensor I have procured several for testing and comparison against the DHT22 sensor which I have used in previous videos. With a somewhat even price comparison as shown between amazon and Bangood between the two, power consumption for the DHT22 being higher in reading scenarios if power budget is a concern. The BME280 dos require some quick assembly if the pin headers are to be used.


Example links only below, do your own comparison!!!!


BME280 -
https://amzn.to/3yN34Xg



DHT22-
https://amzn.to/3Z2tI9i



Wiring the the TTGO is simple, one being I2C the other using a single GPIO. After checking, I'd modified one of the older DHT22 programs to accommodate both sensors for comparison. Initially i had ised a plastic bag to shield the sensors from the AC and fan but it appeared erratic over the course of 30 minutes, looking with the flir showed that the BME280 was too close to the TTGO. Adding extensions solved this, also using a second TTGO helped accuracy and putting all components into a project box further stabilized this. Variation between both BME280s was almost non-existent.


The second cold start test of 30 minutes revealed no skew in temperature, dispelling any internal heater possibility. Further tests of the pressure sensor showed almost no variation and tested close to the value on my Ipad.



In all tests it seems the BME280 did better than the DHT22.

#esp32 #arduino #maker #iot #maker