Wireless Doorbell Using Antique Phone

The project aims to create a wireless doorbell that consists of subscriber line interface circuit, Arduino, antique phone, and battery-operated doorbell.

The device works by pressing a button to ring a phone as the button on the transmitter connects the circuit to the battery, lights the LED, and sends a signal to the receiver. The receiver rings what used to be its speaker as it gets the signal. The speaker connection goes to an input (wirelessRingPin) on the Arduino which sees the pulse from the transmitter and turns on ringModePin by getting the AG1170 ready to ring the phone. One of the connections to the AG1170 (forwardReversePin) is turned ON/OFF 20 times a second by the Arduino. To power the ringer coil, the phone needsa AG1170 to amplify the signal to 70V. the phone is rang twice by the Arduino then waits for someone to again push the button.

The old phone used was Ericsson DE 200 which was cleaned with a rag dampened in one of those environment friendly range based cleaners. Some generic white colored and ammonia like smell metal polish was used to clean the tarnished chrome on the dial.

Rest of the project