I am designing (in my head) a temperature station that will consist of a base unit and one or more remote units. The remote units will send data to the base unit using the TWS-434 wireless transmitter module from rentron or similar. The corresponding receiver module, RWS-434 or similar, will be used in the base unit.
This project is still mostly an idea in my head.
Data Byte 0 0 0 0 0 0 0 0 |_________|____ bits 0-5 : number 0-63 |_________________ bit 6 : type 1=temp 0=batt |____________________ bit 7 : sign 1=neg 0=pos a valid data byte is preceded by two header bytes (0xaa) and followed by the bitwise inverse of the data byte for error checking type check mask = 0x40 sign check mask = 0x80 value mask = 0x3f