Building gauges and gadgets with Arduinos, Raspberry Pis and Switec stepper motors.

Nov 12, 2016 - 1 minute read - Comments - Python Raspberry Pi

py-gaugette Gets a Refresh

I’ve made some major changes to the py-gaugette library to address several issues that have accumulated over time, namely:

  • added interrupt-driven option to rotary encoder
  • fully Python 3 compatible
  • works with current version of Py-WiringPi
  • uses dependency injection for GPIO and SPI interfaces
  • updated Google Sheets code to use new API

Dependency Injection for GPIO and SPI

Classes that interact with the GPIO or SPI interfaces now take an instance of that interface as a parameter to the constructor. This avoids the issue of having multiple classes trying to initialise the GPIO library, and makes it easy to pass alternative interface implementations.

Interrupts for Rotary Encoders

The original implementation of the rotary encoder library used polling. On the Raspberry Pi it now supports interrupts. The previous polling behaviour is still supported.

Fully Python 3 Compatible

While the library has been mostly Python 3 compatible, there were a few exceptions. In particular the SSD1306 class depended heavily on the Python 2 behaviour of the division operator, which changed in Python 3. I’ve rewritten the calculations to mostly use bit shifts rather than division.