Pico Book

Implementations of the exercises in Get Started with MicroPython on Raspberry Pi Pico

Design goals

• Modular code
• Minimize thinking about pins and other physical minutiae, allow mental focus on behavior
• Support automated unit and functional tests
• Minimize on-device QA

To achieve these goals, the code is broken out into components, singletons, models and scripts A component is a physical device wired to the Pico using one or more pins. A model is a collection of components that interact. The primary singleton is the Pico class, which represents the microcontroller configuration i.e., allocation of pins. Scripts tie different components, models and singletons together into an executable.

Dependencies

• Micropython 1.17 or greater
• UnitTest
  • Install with micropython -m upip install unittest

Hardware Used

• Towerpro MG92 Microservo
• LEDs
• PS1240 Piezo Buzzer
• Potentiometer
• TinSharp TC1602A LCD
• PIR Sensor
• AHT20 Humidity/Temperature Sensor
• Adafruit AirLift ESP32 Wifi Board

Functional Testing

To prove correct functioning of components and models, we can write functional tests that observe the states of IO channels. This is possible by providing mock implementations of machine classes for Pin, PWM, ADC, I2C and SPI.

Running Tests

micropython run_tests.py

Running Scripts

Within a micropython interactive session exec(open('scripts/the_script.py').read())