esphome with 433mhz thermometer cresta/alecto protocols

ESPHome
1

Hi

I have some cheap wireless thermometers that broadcast over 433mhz temperature and humidity. protocol is cresta or alecto.

I’m currently using rflink on arduino with esprflinkmqtt on esp8266 to publish rflink messages to home assistant via mqtt

I would like to replace that with an esp32 and a 433mhz receiver directly connected to it.
I know there exists remote receiver in esphome, but it seems to manage only remotes, not thermometers.

Anyone knows a solution to add wireless thermometers to esphome?
thanks

2

Hi, please have a look here TFA Dostmann la Crosse 30-32xx Temperature Humidity outdoor sensor rc-switch. The used protocol seems similar to the alecto protocol.
At start I used remote_receiver with a raw dump and a rc_switch dump to see if the bit data are received.

remote_receiver:
  pin: GPIO04
  # dump: rc_switch
  tolerance: # signal receive is very sensitive to this tolerance!
    type: percentage 
    value: 55% # I don't know why?
  filter: 100us # rc-switch differs heavily from result, greater 200us no data ??
  idle: 4ms # sync is about 4 * 1.7 ms

With this knowledge you have to find your relevant bits in the bit stream. Again the RTL-433 project may be a great help.
Good luck.