If you want change record duration, an external resistor is necessary to select the record duration and sampling frequency, which can range from 8 – 20 seconds (4-12kHz sampling frequency). The Voice Record Module of our provide default connect 100k resistor through P2 by short cap. So the default record duration is 10s.
We can build a Auto PIR Alarm small project. We have record a short alert tone in Voice record module. Then we controlPIR Sensor and Voice record module by Freaduino ATMage328. Of course you can also use PIR and record function. Use your imagination.
Programming Demo code like :
If you want extern power amplifier circuit to Speakers, you can use LM386, D2283, D2322, TA7368, MC34119 etc amplifier IC. Note, SP+ or SP- is you do not want to use, must vacant, do not connect to GND. Used LM386 power amplifier circuit as below: