Voice Recording module board is based on ISD18B20, which is a single-chip single-message record/playback device. Recordings are stored into on-chip non-volatile memory, providing Zero-power message storage. With the embedded Flash memory employed, data retention up to 100 years and typical 100,000 erase/record cycles can be reached. Time for recording is 8-20 seconds.
Features:
Power Input: DC 2.4-5.5V .
With internal audio amplifier, this board can drive 8 Ohm 0.5W speaker directly.
Microphone is on board.
Board dimension: 54mm x 38mm.
All the pins of ISD1820 are extended out with an connector, which can powered and controlled by microprocessor directly.
 
Recording and playback control: Key control or single-chip, control lines IO Has been elicited;
Press to control the recording and playback operation method:
RECkey: Recording button, press and hold can be recorded, release the button to stop recording;
RLAYEkey: Trigger mode playback, click to play the current entire paragraph of the voice;
PLAYLkey: Jog mode playback, press and hold before playback, release to stop playback;
RPLJumper: Loop mode control, can be looped;
FTJumper: Through control, can make the microphone head voice to the speaker playback;

Note: The module output power is small, so the sound is also small, it is recommended to use a digital audio amplifier board and use 3W Speakers to achieve greater sound effects.