Battery Powered 433 MHz Tracking Transmitter
(LPD frequency range)This small PCB delivers a tracking signal which can be received by
a readily available LPD receiver. A MSP430F1232 controls the Hope RFM02 transmitter module. Three beep in FM with a duration
of together around 1 second can be received after a selectable time . Between the three beeps, the whole system turns in power down mode and consumes just around 50 uA.
Features: Size : 20mm x 48mm RF range : 4 channels 433.400 MHz LPD CH 14
433.800 MHz LPD CH 30
434.200 MHz LPD CH 46
434.650 MHz LPD CH 64
Power range : 4 levels - 13 dBm
- 7 dBm
3 dBm ( with optimal environment)
Repeat Time for Beep: 4 selectable delay times
10 seconds 1.550 mA/h
30 seconds 0.175 mA/h
60 seconds 0.113 mA/h
120 seconds 0.082 mA/h
Transmit Time : less than a second Power consumption : Power down mode : 50 uA
Transmitter active : 25 mA ( full power setting)
Voltage : 3.7 V cell phone accumulator and/or
3.5 .. 5.4 V external power.
Automatic switch over.
One may download the C code for the MSP430F1232 here. (5K zipped)
Look at the schematic here. (pdf)
The assembly drawing of the PCB can be found here. (pdf)