Monitor 12 VDC with 415/933 MHz device

[Dan Hinckley]

Has anyone spotted a 415/933 MHz device to monitor a 12 VDC source, which can then be used with the SDR driver for weewx?

[Thomas Carlin]

Hey Dan,

Not an expert by any means, but this can easily be accomplished with an Arduino/clone/ESP8266/Any micro controller, a little code and a little circuitry (Think voltage divider for simplicity).  Depending on the micro controller, you may need to add an ADC (Analog Digital Converter)/ and a 415/933 Mhz transmitter.  

If WiFi is close by, your best bet may be an ESP8266.  I'm using this for many things on my station, monitoring irrigation, grid power, extra temp/humidity sensors, garage door status, Geiger counter, the list goes on.  I wrote a basic threaded MQTT driver for Weewx, and am pulling in an additional 75 measurements from 9 sensors.  Pulling from a SDR will be a little more complicated, because you may have to design you own "protocol" to transmit and decode the data, verify its validity, but with a little experimentation it should be doable.

Stick your project in a small project box, and you can be looking quite professional!

http://carlincomputing.com/weewx