Custom ESPHome Component for the LWLP5000 Differential Pressure Sensor

Fri, 15 May 2026 00:00:00 +0000

I wanted to measure differential pressure in my house just because I was curious about the airflow. The Fermion LWLP5000 by DFRobot seemed like a good fit. High resolution, ±500 Pa range, sub-Pa accuracy, and it throws in a temperature reading for free.

The problem was that ESPHome doesn’t support it. There’s an Arduino library from DFRobot, but going that route means giving up everything that makes ESPHome nice — OTA updates, Home Assistant integration, YAML-based filtering. I didn’t want to maintain a custom Arduino sketch just for one sensor.

So I wrote a proper ESPHome external component for it. This is how that went.

Sensors on Hammer's Lair

Custom ESPHome Component for the LWLP5000 Differential Pressure Sensor