Hi everyone,
Is there any way that I can make my Arduino board make an analog phone call (landline phone calls)? Is there any phone shield for this?
Thank you.
Not that I am aware of, but please note that analog phones have (relative) high voltages that can easily damage an Arduino.
Do you want to call or be called?
What is the goal you have in mind?
robtillaart:
Not that I am aware of, but please note that analog phones have (relative) high voltages that can easily damage an Arduino.
Do you want to call or be called?
To Call & be Called
robtillaart:
What is the goal you have in mind?
Making a regular telephone device with some extra funtions
Any commerical device requires FCC approved interface access to the POTS via a "DAA module". This handles the electrical interface to the phone line and allow fairly easy interface to the logic controls (go on-hook, go off-hook, ring indicator) and audio interface (2 wire to 4 wire hybrid audio in and out corcuit). You can look for such modules on E-bay, surplus outlets, or sometime hack them from older Hayes type modems or other consumer equipment designed to plug into phone lines. The phone company is very picky about how you wire to the phone system. You are not allowed to ground either tip or ring wires. During active ringing there is 90vac 20hz on the wires, -48vdc during on-hook condition. Damage to the arduino is very possible if you don't follow proper interfacing methods.
Lefty