21-09-2008, 11:41 AM
Definition
Cellular through remote control switch implies control of devices at a remote location via circuit interfaced to the remote telephone line/device by dialing specific DTMF (dual tune multi frequency) digits from a local telephone. This project Cellular through remote control switch has the following features
1. It can control multiple load (on/off/status each load)
2. It provides you feedback when the circuit is in energized state and also sends an acknowledgement indicating action with respect to the switching on of each load and switching off of all loads (together).
It can selectively switch on any one or more loads one after the other and switch off all loads simultaneously
OPERATION
1. Dial the Phone Number - a OK tone produced
2. Password - 4321
3. Load number - 1, 2, 3, 4
4. Control number - 9/on, O/off, # / status
When the phone number is dialed the ring detector sense the ring and the auto lifter works after some time. When the auto lifter works an OK tone is produced. Then the password is entered. The password is 123451 Then to check the status of the corresponding load enter # and load number. To on the load enter 9 and load number. To off the load enter 0 and load number. The whole operation is done within 3 minutes. After 3 minutes the operation is timeout.
