Waveshare PoE HAT (B) for Raspberry Pi 3B+/4B | 802.3af & OLED Display

Simplify Your Setup with 802.3af Power Over Ethernet Deliver both stable power and a high-speed network connection through a single Ethernet cable to eliminate desktop cable clutter. The Waveshare PoE HAT (B) features a fully isolated switched-mode power supply (SMPS) that safely steps down 37V-57V PoE input to a clean 5V 2.5A output for your Raspberry Pi. This makes it incredibly easy to deploy Raspberry Pi clusters, digital signage, or remote security cameras in locations where standard AC wall outlets are unavailable. Real-Time System Monitoring via 0.91" OLED Keep track of your Raspberry Pi's vital statistics instantly on the built-in 128x32 pixel OLED screen. Driven by the reliable SSD1306 controller, this crisp white display can be programmed to show your device's IP address, CPU temperature, and fan status in real-time. This visual feedback is invaluable for headless server setups, allowing IT administrators to diagnose network issues or thermal throttling without needing to SSH into the system. Intelligent Active Cooling System Prevent thermal throttling during heavy workloads with the programmable onboard cooling fan. The HAT features a physical switch that allows you to set the fan to run automatically upon power-up or configure it for programmable control via the I2C bus. By utilizing the integrated PCF8574 IO expander, the fan operates efficiently without consuming your Raspberry Pi's primary GPIO pins, ensuring your processor stays cool even during intensive edge-computing tasks. Pro Tip from Our Technicians Ensure your network router or switch is actively 802.3af-compliant before connecting this HAT to avoid power delivery failures. Our Sham Shui Po DIY specialists remind you that standard "passive PoE" injectors will not work and may damage the board. Additionally, because the OLED and fan control utilize the I2C interface, you can easily daisy-chain other I2C sensors using the extra expansion pads provided on the board.