Hello everyone, I’ve been diving into the world of home automation lately and decided to set up a motion detection system using the LD2410 and BH1750 sensors. It’s been an exciting journey, but not without its challenges!
My Setup
I’m using a D1 Mini ESP32 to connect these sensors. The LD2410 is hooked up via UART, while the BH1750 is connected through I2C. The goal was to create a system that detects motion and measures light levels, integrating everything into Home Assistant.
The Problem
Initially, I faced a significant hurdle when the BH1750 sensor wouldn’t connect via I2C. Despite multiple attempts, the sensor remained unresponsive. The logs indicated that the I2C bus couldn’t detect any devices, which was perplexing since the sensor worked fine when tested independently.
Troubleshooting
I started by checking the connections. The BH1750 was connected to GPIO4 (SDA) and GPIO5 (SCL) on the D1 Mini. I also ensured that the power supply was stable, ruling out voltage issues. However, the problem persisted.
Next, I reviewed the configuration in the ESPHome YAML file. The I2C bus was correctly defined, and the sensor was properly addressed. I even tried different I2C addresses, but nothing changed.
The Breakthrough
After some research, I realized that the issue might be related to the UART and I2C buses conflicting. The LD2410 was using high-speed UART communication, which might have been interfering with the I2C signals. To test this theory, I adjusted the UART settings to reduce the baud rate and added delays between sensor readings. This adjustment allowed the I2C bus to function without interference.
Final Solution
The key was to ensure that the UART and I2C buses didn’t overlap in a way that caused conflicts. By carefully managing the communication protocols and timing, I was able to get both sensors working seamlessly together. The BH1750 now provides accurate light level readings, while the LD2410 detects motion reliably.
Lessons Learned
This experience taught me the importance of understanding how different communication protocols interact on a single device. It’s crucial to manage bus contention and ensure that each component has the necessary resources to operate without interference.
I hope this story helps anyone else facing similar issues. If you have questions or need further clarification, feel free to ask! Happy coding and happy automating! 