The RCWL sensor has a lil solder jumper on the back that lets you turn it into “IIC” mode – we tried it out and … it kinda works! This sensor can be used on an I2C bus, but it doesn’t seem to do well if sharing it with other devices. Still, if you have a microcontroller or microcomputer that doesn’t have fast GPIO for toggle/pulse or a hardware UART, you definitely can use it for inexpensive sensing. Note that on this QT Py RP2040 we’ve got the OLED on a different I2C bus which is why it’s happily running for hours now. In stock at the adafruit shop! https://www.adafruit.com/product/4742 & video.
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