Hi everyone! 
I’m trying to get a MR24HPC1 mmWave sensor working with an ESP32C3 Supermini (Tenstar Robot) through ESPHome, but I’m running into a small hurdle. While the device connects successfully, all the sensor states remain “Unknown” in Home Assistant.
Setup Details
Hardware:
- ESP32C3 Supermini (Tenstar Robot)
- MR24HPC1 mmWave Sensor
Connections:
| ESP32C3 Pin | MR24HPC1 Pin |
|---|---|
| 5V | VCC |
| GND | GND |
| GPIO4 (D2) | RX |
| GPIO5 (D3) | TX |
Software:
- ESPHome 2024.12.2
- Latest Home Assistant Core
What’s Working
- Device successfully connects to WiFi (great signal: -41 dB)
- Shows up in Home Assistant
- ESPHome compilation and installation are successful
- No visible errors in logs
What’s Not Working
- All sensor entities show as “Unknown”
- No sensor data seems to be coming through
ESPHome Configuration
Here’s the relevant parts of my YAML:
uart:
id: uart_bus
baud_rate: 115200
rx_pin: 4
tx_pin: 5
parity: NONE
stop_bits: 1
seeed_mr24hpc1:
id: my_seeed_mr24hpc1
# [Sensor configurations follow...]
What I’ve Tried
- Direct .bin firmware flash
- Using ESPHome Builder within Home Assistant
- Double-checked all wiring connections
- Verified power supply
- Enabled DEBUG logging
Logs
The device connects fine, but there’s no sensor data coming through. Here’s a snippet from the logs showing successful connection:
[22:13:33][C][wifi:436]: IP Address: 192.168.178.86
[22:13:33][C][wifi:443]: Signal strength: -41 dB ▂▄▆█
Has anyone successfully integrated this sensor with an ESP32C3? Any ideas what I might be missing?
I feel like the issue lies in the connection between the mmwave and the ESP. The Pin layout on the official Xiao ESP32-C3 is different, but i chose the right GPIO Pins for my controller.
Thanks in advance for any help! 