This kit makes it possible to turn up to three devices on or off over the telephone. It is also possible to check the condition of a switch (open or closed). Example: when you are away on holiday, you may switch the lights on and off from time to time, check the alarm or turn on the heating before returning home. A major advantage of this circuit lies in the fact that audio signals are used to tell whether a specific output has been turned on or off. Operation is protected by a user defined code, which is simply keyed in from the telephone keypad.
Controlled from a touch tone phone (DTMF)
Unit gives audible feedback of output status
Adjustable security code
Room for three output relays, one relay included
Input to monitor the status of a switch from a distance
Automatic pickup can be selected for ± 8 or ± 3 rings
Automatic hang-up if no code is entered within 20 seconds
A relay is included for one output: 10A / 250VAC
Power supply: 12VAC or DC / 300mA
Dimensions: 4.1 x 5.1"
Difficulty: Intermediate (Velleman Level 3 out of 5)