# pi_gpiozero_examples

A collection of examples for using the gpiozero library for reading sensors and activating actuators


# First steps

Install python3-gpiozero

`$ sudo apt update && sudo apt install python3-gpiozero`

All of these examples are based on [the excellent documentation of the gpiozero library](https://gpiozero.readthedocs.io/en/stable/index.html)

## analogSensor.py

How to read analog values using a MCP3008 ADC (analog to digital converter)

## distanceSensor.py

Using HC-SRO4 distance sensor

Hardware required: 
	
	* 330 & 470 ohm resistors
	* HC-SRO4 Distance sensor

## ldrLed.py

Using an LDR to set the values of an LED, also smoothing and constraining sensor values in the process

Hardware required:

	* LDR
	* LED
	* 330 ohm resistor

## servo.py

Operate a servo

## webLed.py

Turn an LED on or off based on the input from a web page

Requires `flask` (`$ sudo apt install python3-flask`)

To change the look of the HTML page, have a look at the folder `template`

## remoteGpioFromHome.py

Interact with an LED using remote-gpio. This allows you to write python code on your own laptop but to use sensors and actuators on the Pi.

## remoteGpioFromPi.py

Read buttons on different Pis in the VPN to trigger an LED.

## heartbeat.py

Changed the implementation of [tut RPi's Heartbeat Pulse Sensor](https://github.com/tutRPi/Raspberry-Pi-Heartbeat-Pulse-Sensor) to work with gpiozero. 

Look at `heartbeat.py` for how to use it. `pulsesensor.py` is the underlying pulse detection logic. 

Works in conjunction with analog heartbeat sensors and the MCP3008 ADC.