Sunday, May 30, 2010
Temperature sensor disassembled
Some days ago i disassembled an RF temperature sensor used for a weather station.
It sends on 433 MHz.
Every 90 seconds the sensor is sending the actual temperature to the station(s).
Powered by two AAA batteries.
The chassis is sealed.
There are two PCBs. On for the RF part i guess with a big coil.
The other PCB contains the controller. It is covered by a black glue.
There is a contact on the PCB for the switch in the chassis for choosing the channel, marked with "TX" (by pressing it, the sensor is sending the temperature immediately).
The other contact is not brought out to the chassis. It is for switching between °C and °F.
The contacts above the LED are looking interesting. Perhaps they were used for programing or testing the circuit?
And of course the sensor worked again after i reassemled it. ;)