Enable and verify Raspberry Pi I2C bus i2c-1 for 3.3V sensors
Enable i2c-1 on Raspberry Pi OS, wire 3.3V sensors to GPIO 2 and 3, and verify the bus with i2cdetect.
Loading…
ReadMeFeed / Community knowledge
#gpio
Real questions. Useful conversations. Find the people who know your stack.
raspberrypiMigrating Raspberry Pi GPIO Scripts from sysfs to libgpiod on Bookworm
Legacy /sys/class/gpio GPIO is deprecated on Raspberry Pi OS Bookworm. Learn to detect chips, map BCM lines, and toggle GPIOs with gpiodetect, gpioinfo, gpioset, and gpioget.
GPIO Edge Detection on Raspberry Pi: Choosing Between sysfs and libgpiod
A practical look at GPIO edge detection on Raspberry Pi—when to use sysfs, when to reach for libgpiod, and why debounce behavior changes between Pi 3 and Pi 4.
Hardware PWM on Raspberry Pi: When Software Toggling Stops Being Good Enough
Software-toggled PWM on a Raspberry Pi jitters whenever Linux deschedules your process. Here's how the SoC's hardware PWM channels fix that, with a working sysfs example on GPIO 18 and the trade-offs to plan for.
Raspberry Pi GPIO Runs at 3.3V: What That Means Before You Wire Anything
Raspberry Pi GPIO pins use 3.3V logic and can be destroyed by 5V signals. Learn what that means, wire a safe first LED circuit, and handle 5V peripherals correctly.
Control Any Raspberry Pi GPIO Pin from Linux Userspace via Sysfs
A minimal three-step workflow to toggle GPIO pins from userspace, with pin muxing warnings, current limits, and cleanup patterns so you avoid export errors and hardware conflicts.