# buzzer


A program to run alarm on button pushed.

To activate the alarm, push the button. Same for desactivation.
The alarm is launched in a separate task and controlled by
the main task (which holds the push button logic).

You can run the application in "DEBUG" mode using:
`make run-debug name=buzzer`
The FreeRTOS engine is replaced by threads. 

## Hardware

### Variant 1

* 1x Passive Buzzer
* 1x Push button
* 1 NPN transistor for signal amplification
* 1x 1k ohm resistor (NPN collector)
* 2x 10k ohm resistor

<div align="center">
<img src="circuit.jpg" style="transform:rotate(-90deg); margin:-100px;" width="300" />
</div>

### Variant 2
You can play with the frequency [1500; 2000] hz thanks to the potentiometer.

* Variant 1
* 1x Rotary potentiometer
* 1x blue LED

<div align="center">
<img src="circuit_variant.jpg" style="transform:rotate(-90deg); margin:-90px;" width="300" />
</div>

Enjoy ! 😉