Why doesn’t the Arduino connect to the phone dialer?

When the phone isn’t being dialed, the switch in the dial unit is closed (a so-called NORMALLY CLOSED switch, for obvious reasons) so the circuit connects pin 2 to ground (which to the Arduino is LOW). This is because there is much less resistance through the 470 ohm resistor than the 10K resistor.

How do I use an old rotary phone with an Arduino?

An old rotary phone can be used for a number of purposes in your Arduino projects - use it as a novel input device, or use the Arduino to interface a rotary phone to your computer. This is a very basic guide describing how to interface the dial to an Arduino, and get the number dialed passed into a computer over the Arduino’s serial link.

Why is pin 2 on the Arduino on high?

Pin 2 will go HIGH for each pulse as the dial rotates. When the phone isn’t being dialed, the switch in the dial unit is closed (a so-called NORMALLY CLOSED switch, for obvious reasons) so the circuit connects pin 2 to ground (which to the Arduino is LOW).

How to connect the sim800/sim900 module to Arduino?

Connect SIM800/SIM900 Module to Arduino digital pin 2 & 3. Similarly connect the 16x2 LCD to Arduino analog pins A0, A1, A2, A3, A4, A5. Similarly connect 4x4 Keypad to Arduino digital pins 11, 10, 9, 8, 7, 6, 5, 4.

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Frequently Asked Questions
Why doesn’t the Arduino connect to the phone dialer?
When the phone isn’t being dialed, the switch in the dial unit is closed (a so-called NORMALLY CLOSED switch, for obvious reasons) so the circuit connects pin 2 to ground (which to the Arduino is LOW). This is because there is much less resistance through the 470 ohm resistor than the 10K resistor.
How do I use an old rotary phone with an Arduino?
An old rotary phone can be used for a number of purposes in your Arduino projects - use it as a novel input device, or use the Arduino to interface a rotary phone to your computer. This is a very basic guide describing how to interface the dial to an Arduino, and get the number dialed passed into a computer over the Arduino’s serial link.
Why is pin 2 on the Arduino on high?
Pin 2 will go HIGH for each pulse as the dial rotates. When the phone isn’t being dialed, the switch in the dial unit is closed (a so-called NORMALLY CLOSED switch, for obvious reasons) so the circuit connects pin 2 to ground (which to the Arduino is LOW).
How to connect the sim800/sim900 module to Arduino?
Connect SIM800/SIM900 Module to Arduino digital pin 2 & 3. Similarly connect the 16x2 LCD to Arduino analog pins A0, A1, A2, A3, A4, A5. Similarly connect 4x4 Keypad to Arduino digital pins 11, 10, 9, 8, 7, 6, 5, 4.

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