Last active
August 14, 2025 06:14
-
-
Save vurdalakov/7e2aca81c067b879b906513838cf9af9 to your computer and use it in GitHub Desktop.
A MicroPython program that scans all available I2C bus configurations on the Raspberry Pi Pico (RP2040 and RP2350), cycling through high, standard, and low frequencies to detect and list connected I2C devices.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# A MicroPython program that scans all available I2C bus configurations on the Raspberry Pi Pico (RP2040 and RP2350), | |
# cycling through high, standard, and low frequencies to detect and list connected I2C devices. | |
# https://gist.github.com/vurdalakov/7e2aca81c067b879b906513838cf9af9 | |
from machine import Pin, I2C | |
count = 0 | |
# RP2040 and RP2350A have 30 GPIOs; RP2350B has 48 GPIOs | |
for i in range(0, 48, 2): | |
if i in (22, 24, 28): | |
# GPIOs 23, 24, 25, and 29 are utilized internally on the Pico board | |
continue | |
i2c_id = int(i % 4 / 2) | |
sda_pin = i | |
scl_pin = i + 1 | |
for i2c_freq in (400000, 100000, 10000, 1000): | |
print(f"--- I2C {i2c_id}, SDA {sda_pin}, SCL {scl_pin}, {i2c_freq:6d} Hz", end="\r") | |
try: | |
i2c = I2C(id=i2c_id, sda=Pin(sda_pin), scl=Pin(scl_pin), freq=i2c_freq) | |
except ValueError: | |
continue | |
device_addresses = i2c.scan() | |
if len(device_addresses) > 0: | |
print() | |
for device_address in device_addresses: | |
print(f"({count}) hex: 0x{device_address:02X}, dec: {device_address:3d}") | |
count = count + 1 | |
break | |
print(' '*40, end="\r") | |
print(f"=== I2C devices found: {count}") |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
--- I2C 1, SDA 6, SCL 7, 400000 Hz | |
(0) hex: 0x57, dec: 87 | |
(1) hex: 0x68, dec: 104 | |
=== I2C devices found: 2 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment