Automation HAT is a home monitoring and automation controller featuring relays, analog channels, powered outputs, and buffered inputs (all 24V tolerant). This library will also work with Automation HAT's smaller siblings - Automation pHAT and Automation HAT Mini.
We've created an easy installation script that will install all pre-requisites and get your Automation HAT, pHAT or HAT Mini up and running with minimal efforts. To run it, fire up Terminal which you'll find in Menu -> Accessories -> Terminal on your Raspberry Pi desktop, as illustrated below:
In the new terminal window type the command exactly as it appears below (check for typos) and follow the on-screen instructions:
curl https://get.pimoroni.com/automationhat | bash
Alternatively, on Raspbian, you can download the
pimoroni-dashboard and install your product by browsing to the relevant entry:
sudo apt-get install pimoroni
(you will find the Dashboard under 'Accessories' too, in the Pi menu - or just run
pimoroni-dashboard at the command line)
If you choose to download examples you'll find them in
sudo apt-get install python3-automationhat
sudo pip3 install automationhat
sudo apt-get install python-automationhat
sudo pip2 install automationhat
If you want to contribute, or like living on the edge of your seat by having the latest code, you should clone this repository,
cd to the library directory, and run:
sudo python3 setup.py install
sudo python setup.py install whichever your primary Python environment may be)
In all cases you will have to enable the i2c bus.
The ADS1015 is a 12-bit ADC, but since the 12th bit is the sign-bit there are only 11-bits of resolution available for positive voltage readings. The input voltage for 24v channels is scaled from 0-25.85v (25.85 rather than 24 due to how the resistor divider is set up) to 0-3.3v.
Since the full-scale range of the ADC is set to 4.096v, this means that 0-3.3v gives only ~1649 possible usable values making the input measurement granularity somewhere around 0.015v (25.85 / 1649) for the 24v inputs and 0.002v for the 3.3v input.
More information on this topic can be found here: https://forums.pimoroni.com/t/automation-hat-accuracy/7252/3