Step 3: Background: How the Recording Module Works
This recording module can store sound clips up to 20 seconds long. The play function is activated when the play pin on the chip is set to the logical LOW state (in this case less than 4 volts). This is normally accomplished by pressing the play button which connects the pin to ground (0 volts). It can also be done with an external switch. A close inspection of the circuit board reveals that there are two open pinholes that are also connected to the play pin. By attaching one wire to ground and one wire to either of these pinholes, you can use a secondary circuit or switch to activate the recording module. In this project we will be using the output of the wireless receiver as the switch to initiate the play function.