[Wim-T]

Hello community,

I have finally finished my 4Pro transmitter unit.
Can the UVM-30A and the solar cell for solar radiation measurement be connected to the 4Pro transmitter unit directly without the solar/UV interface?
It is not yet clear to me how the solar cell or the UVM-30A are connected. I am currently using the interface, but I would like to do without it.
The transmitter unit can be supplied with voltage via a solar module. If I connect this to the 12V interface and if so, what does the battery look like, is it also connected to the 12V interface and/or do I need a charging module for the battery ?
My last question concerns the TX LED and the fan LED. In the parts list, the FAN LED is specified as a "Blue" LED, the TX LED has no color assigned. Can I also use other colors for the LEDs? As far as I remember, some colored LEDs also have different voltages. Would I have to replace resistor R8 with a different value to change the voltage for the FAN LED?

I just had a question about the HTU21 temperature sensor. I wanted to try out a different T/H sensor instead of the SHT31 and the HTU21. I received this sensor:
Si7021 Humidity Sensor Temperature Sensor I2C SHT21 HTU21 GY-21 Sensor Module
Can someone tell me exactly what kind of sensor I have? I can't find any explanation about the sensor on the web. In the firmware for the transmitter unit I can set 1 for SHT21 or 2 for HTU21 for TH Sensor0 and then I get identical values displayed on the serial monitor.
Can anyone give me a hint about this?

Greetings.....

Hello Sun_Dancer,

Maybe this url can help you for the HTU 21, i did not use this sensor by myself but i try to help with information.
https://learn.adafruit.com/adafruit-htu2...ity-sensor  https://learn.adafruit.com/adafruit-htu2...or/pinouts

Kind regards,
Wim