Any idea on how to make (or where to obtain schematic / kit) an IR sensor, which triggers a powerful bright light when it detects motion or body heat?
Also, can anybody explain or clarify how relays actually work? As in, does the relay actually have to be connected in some way to the circuit it will be triggering, or is it remote? e.g an infra red alarm, relay triggers a siren of some kind... does the siren have to be physically connected to the ir circuit?
thanks for your help
Also, can anybody explain or clarify how relays actually work? As in, does the relay actually have to be connected in some way to the circuit it will be triggering, or is it remote? e.g an infra red alarm, relay triggers a siren of some kind... does the siren have to be physically connected to the ir circuit?
thanks for your help