The main components are atmega328p micro cpu, RFM12b radio modules and DS18S20 for temperature measurement.
Temperature sender unit
Sender code – github
Senders can power up using USB power converters or pattery pack.
Display unit gets power from any USB.
Display unit owns LCD plug (MCP23008) between atmega328p and LDC.
Now I thought it might by cool to collect all sensors data.
So I build network module who collects the same data that display module gets but sends it to my zabbix server.
Network module is built using ENC28J60
So now I can see cool graphs