Hi,
I am trying to build an alarm system that can detect when units have been moved more than a certain distance from the alarm unit, and sets the alarm off.
I have designed a simple circuit using quite a few PICAXE chips with BASIC programming to operate the circuit.
HOwever I am really struggling to find a suitable wireless connection between units and the actual alarm unit, so that the unit can differentiate between different units (with different signals or something?).
I have tried IR however that has the major disadvantage that it only works in straight lines of site. I also looked at using a radio garage door opener to create a permanent signal, and the radio transmitter can be attached to the unit that i want to alarm. However this drains the battery of the transmitter incredibly quickly, using one for such a long period of time is against RF regulations, and also I do not know how to get multiple transmitters on the same frequency to be individually identified by the radio receiver so that it can output specific codes for each transmitter and even less so how this can be interfaced to a picaxe circuit.
Any help will be greatly appreciated!!
Many Thanks
I am trying to build an alarm system that can detect when units have been moved more than a certain distance from the alarm unit, and sets the alarm off.
I have designed a simple circuit using quite a few PICAXE chips with BASIC programming to operate the circuit.
HOwever I am really struggling to find a suitable wireless connection between units and the actual alarm unit, so that the unit can differentiate between different units (with different signals or something?).
I have tried IR however that has the major disadvantage that it only works in straight lines of site. I also looked at using a radio garage door opener to create a permanent signal, and the radio transmitter can be attached to the unit that i want to alarm. However this drains the battery of the transmitter incredibly quickly, using one for such a long period of time is against RF regulations, and also I do not know how to get multiple transmitters on the same frequency to be individually identified by the radio receiver so that it can output specific codes for each transmitter and even less so how this can be interfaced to a picaxe circuit.
Any help will be greatly appreciated!!
Many Thanks