Using Qwiic/Stemma QT (I2C)

Piunora comes equipped with a Stemma QT / Qwiic connector which is a standard originally coined by Sparkfun to easily connect I2C devices with a standardized cable and connector. Adafruit sells compatible products under the brand Stemma QT.

Qwiic Connector

The connector on Piunora is connected to I2C-1 which is also the default I2C port in Blinka. So you can access the I2C port in blinka with the board.SDA and board.SCL (given you have import board).

Almost if not all Blinka/CircuitPython code examples for Qwiic or Stemma QT devices should just work as is.

Here an example for interfacing with the Adafruit VCNL4040 proximity and lux sensor and letting it do virtual key presses. You may need to install the python keyboard library with pip install keyboard

import math
import time
import board
import busio
import adafruit_vcnl4040
import neopixel
import simpleio
import keyboard

pixels = neopixel.NeoPixel(board.D12, 1, brightness=0.2)
i2c = busio.I2C(board.SCL, board.SDA)
sensor = adafruit_vcnl4040.VCNL4040(i2c)

while True:
	print("Proximity:", sensor.proximity)
	pixels.fill((0, math.floor(simpleio.map_range(sensor.proximity,3,200,0,255)), 0))

	if sensor.proximity > 6:'space')
Last modified December 2, 2021