Hello everyone, I am an independent researcher for a project in Singapore titled “FoodWall” with the mission of going beyond leafy greens and LEDs into solar powered vertical technology that produces a well balanced diet including calories and protein. Myself and a Georgia Tech intern are working on the designs for the foodwall system and publishing to Github and our website with articles and we also have a workshop with a closed growth chamber fully equiped with 150W fully ajustable spectrum LED lights and a 2m hydroponic tower able to hold 8x plants at a time.
The problem - DHT22 fails
We have a problem with our DHT22. The sensors are connected in a loop together with a common +5.5V power supply and after reading for some time, eventually they fail and stop reading, and can only be reset by cycling the power supply. The timing of when the fail is a bit unpredictable, sometimes it can run for up to 3-6 hrs, sometimes it fails only after 30 min. The readings are taken using Arduino, and then the data is consolidated by a Raspberry Pi via Serial USB. The intention is for the RBPI to then post to a web service, although this part is not yet implemented. I have put up details of the problem on stackexchange, and also I have uploaded all of the code and a circuit diagram onto the Github repo “plantlab”