Review on 🌡️ Comimark High Precision Transmitter 1Pcs SHT20 Temperature Humidity Sensor Modbus RS485 by Ronald Howlett

Working. like, something like. Of the four devices purchased, two no longer measure humidity and one returns garbage to measure temperature and humidity. They seem to generate a significant amount of heat inside. With a 24 V power supply and still air, the temperature display rises by 4-8 degrees Celsius within a few minutes. This applies to all divisions. and only the initial readings approximate ambient temperature. If you have a switchable fan, the readings are useless because you can't calibrate it. Who knows, you might want to leave them unpowered unless you're actively taking readings every few minutes. I'm not sure how accurate the humidity is, but two devices next to each other show +/- 10% RH. Two points to use: The device must be powered on and enabled for the address configurations to take effect. You must wait after writing a configuration register before reading another register. otherwise, the read operation fails. Example: Write Modbus address register, wait 500 ms, read Modbus address register.