Uploaded March 2025 | Updated September 2026, 1 week ago
Micropython I2C communication with Raspberry Pi Pico as Responder
Setup:
Controller:
- Raspberry Pi Zero 2
Responders:
- Raspberry Pi Pico
- RP2040-Zero
- RP2350-Zero
Connections (for video recording only):
- RPi Zero 2 connected via WiFi
- Picos connected via USB
Data Transmission:
- Data fields are encapsulated in dataframes with a checksum for validation at the receiver.
- Structure: STX + Field1 + Field2 + ... + Checksum + ETX (with escape characters if needed).
- Each transmission includes up to four 16-bit fields.
- The responder returns an 8-bit response: 1 if the checksum is correct, 0 otherwise.
I2C Bus:
- 4.7kΩ pull-up resistors on SDA & SCL.
- 470Ω series resistors on SDA & SCL (at Raspberry Pi Zero).
Code & Examples: github.com/AndreaFavero71/i2c_pico_responder
One example demonstrates using one Pico as the Controller and others as Responders.
This protocol is now used in this robot: youtu.be/ORftNl7bZG4
Micropython I2C communication with Raspberry Pi Pico as Responder
Setup:
Controller:
- Raspberry Pi Zero 2
Responders:
- Raspberry Pi Pico
- RP2040-Zero
- RP2350-Zero
Connections (for video recording only):
- RPi Zero 2 connected via WiFi
- Picos connected via USB
Data Transmission:
- Data fields are encapsulated in dataframes with a checksum for validation at the receiver.
- Structure: STX + Field1 + Field2 + ... + Checksum + ETX (with escape characters if needed).
- Each transmission includes up to four 16-bit fields.
- The responder returns an 8-bit response: 1 if the checksum is correct, 0 otherwise.
I2C Bus:
- 4.7kΩ pull-up resistors on SDA & SCL.
- 470Ω series resistors on SDA & SCL (at Raspberry Pi Zero).
Code & Examples: github.com/AndreaFavero71/i2c_pico_responder
One example demonstrates using one Pico as the Controller and others as Responders.
This protocol is now used in this robot: youtu.be/ORftNl7bZG4
