Exploring Raspberry Pi 3 to Teensy with MicroPython

In the world of microcontrollers and single - board computers, the Raspberry Pi 3 and Teensy are two popular platforms. When combined with MicroPython, a lean and efficient implementation of the Python 3 programming language that is optimized to run on microcontrollers, they offer a powerful and accessible way for teens and hobbyists to dive into electronics and programming. This blog will guide you through the fundamental concepts, usage methods, common practices, and best practices of using Raspberry Pi 3 and Teensy with MicroPython.

Table of Contents#

  1. Fundamental Concepts
    • What is Raspberry Pi 3?
    • What is Teensy?
    • What is MicroPython?
  2. Usage Methods
    • Setting up Raspberry Pi 3 with MicroPython
    • Setting up Teensy with MicroPython
    • Communication between Raspberry Pi 3 and Teensy
  3. Common Practices
    • GPIO control on Raspberry Pi 3 using MicroPython
    • Sensor interfacing on Teensy with MicroPython
    • Data transfer between the two platforms
  4. Best Practices
    • Code organization and modularity
    • Error handling and debugging
    • Power management
  5. Conclusion
  6. References

Fundamental Concepts#

What is Raspberry Pi 3?#

The Raspberry Pi 3 is a credit - card sized single - board computer developed in the United Kingdom by the Raspberry Pi Foundation to promote the teaching of basic computer science in schools and developing countries. It has a 1.2GHz 64 - bit quad - core ARM Cortex - A53 CPU, 1GB of RAM, built - in Wi - Fi and Bluetooth, and multiple GPIO (General Purpose Input/Output) pins. This makes it suitable for a wide range of applications, from home automation to media centers.

What is Teensy?#

Teensy is a family of microcontroller development boards known for their small size, low power consumption, and high performance. Teensy boards have different levels of capabilities, with some offering features like a large number of GPIO pins, analog input/output, and high - speed USB interfaces. They are often used in projects where space and power efficiency are crucial, such as wearable electronics and small - scale robotics.

What is MicroPython?#

MicroPython is a version of Python 3 designed for microcontrollers and constrained environments. It includes a small subset of the Python standard library, along with additional modules for interacting with hardware features like GPIO pins, sensors, and communication interfaces. MicroPython allows users to write code in a high - level, easy - to - understand language, reducing the learning curve compared to traditional low - level programming languages like C or Assembly.

Usage Methods#

Setting up Raspberry Pi 3 with MicroPython#

  1. Install Raspbian: Start by installing the Raspbian operating system on your Raspberry Pi 3. You can use tools like Etcher to write the Raspbian image to an SD card.
  2. Enable SSH and VNC (Optional): If you want to access your Raspberry Pi remotely, enable SSH and VNC in the Raspberry Pi Configuration tool.
  3. Install MicroPython: You can install MicroPython on the Raspberry Pi by opening the terminal and running the following command:
sudo apt - get update
sudo apt - get install micropython
  1. Run MicroPython: You can start the MicroPython interpreter by typing micropython in the terminal.

Setting up Teensy with MicroPython#

  1. Download the MicroPython Firmware: Visit the official MicroPython website and download the appropriate firmware for your Teensy board.
  2. Flash the Firmware: Use the Teensy Loader application to flash the MicroPython firmware onto your Teensy board. Make sure your Teensy is in bootloader mode before flashing.
  3. Connect to the Teensy: Connect your Teensy to your computer via USB. You can use a serial terminal program like PuTTY or screen to communicate with the MicroPython interpreter on the Teensy.

Communication between Raspberry Pi 3 and Teensy#

One common way to establish communication between the Raspberry Pi 3 and Teensy is through the USB serial interface.

  1. On the Teensy:
import machine
import uos
import utime
 
# Initialize serial communication
uart = machine.UART(0, baudrate = 115200)
 
while True:
    if uart.any():
        data = uart.read()
        print('Received:', data)
    utime.sleep(0.1)
  1. On the Raspberry Pi:
import serial
import time
 
ser = serial.Serial('/dev/ttyACM0', 115200)
 
while True:
    ser.write(b'Hello from Raspberry Pi!')
    time.sleep(1)

Common Practices#

GPIO control on Raspberry Pi 3 using MicroPython#

import machine
import utime
 
# Set up a GPIO pin as an output
led = machine.Pin(17, machine.Pin.OUT)
 
while True:
    led.on()
    utime.sleep(1)
    led.off()
    utime.sleep(1)

Sensor interfacing on Teensy with MicroPython#

import machine
import utime
 
# Set up an analog input pin for a sensor
sensor = machine.ADC(0)
 
while True:
    sensor_value = sensor.read()
    print('Sensor value:', sensor_value)
    utime.sleep(1)

Data transfer between the two platforms#

The example above for communication between the Raspberry Pi 3 and Teensy shows how data can be transferred. The Raspberry Pi can send commands or data to the Teensy, and the Teensy can respond with sensor readings or other relevant information.

Best Practices#

Code organization and modularity#

  • Separate functions: Break your code into small, reusable functions. For example, if you have a function to read sensor data on the Teensy, make it a separate function that can be called from different parts of your code.
  • Use classes: If your project becomes more complex, use classes to organize related functionality. For example, you can create a class for a specific sensor that encapsulates all the methods for reading and processing sensor data.

Error handling and debugging#

  • Try - except blocks: Use try - except blocks in your MicroPython code to handle potential errors. For example, when reading data from a sensor, if there is an error in the reading, you can catch the exception and handle it gracefully.
try:
    sensor_value = sensor.read()
except Exception as e:
    print('Error reading sensor:', e)
  • Print debugging information: Insert print statements in your code to help you understand what is happening at different stages of execution.

Power management#

  • Sleep modes: On both the Raspberry Pi 3 and Teensy, use sleep modes when the device is not actively performing tasks. For example, on the Teensy, you can use the machine.deepsleep() function to put the device into a low - power state.

Conclusion#

Combining Raspberry Pi 3, Teensy, and MicroPython offers a powerful and accessible way to develop electronics projects. With the high - level programming capabilities of MicroPython, users can quickly prototype and implement complex functionality on these platforms. By following the usage methods, common practices, and best practices outlined in this blog, you can efficiently use these technologies to bring your projects to life.

References#

2025-10