Solar-powered presence sensor using high-frequency radio technology and PIR, for ESPHome

Xtend Solarmi PS02C3-ESP-EU — Presence Sensor with mmWave and PIR

Home automation relies on accurate presence detection, and this sensor is designed to address exactly that. By combining mmWave radar and a PIR sensor, it can precisely detect not only motion but also the subtle presence of individuals—making it an ideal solution for systems like ESPHome and Home Assistant. The built-in ESP32C3 chip ensures fast data processing and seamless integration. Furthermore, the radar sensitivity and detection range can be adjusted to suit your specific needs, offering installation flexibility and minimizing false triggers.

Precise Detection and Customization

This sensor is capable of detecting both the presence of people in a room and their subtle movements, enabling it to trigger automations—such as turning on the lights. With adjustable parameters for sensitivity, detection distance, and delay time, its functionality can be tailored to various environments, making it an excellent choice for residential spaces or offices.

Simple Integration and Advanced Features

Equipped with an integrated CH340C serial chip, firmware updates are a breeze, simplifying maintenance and the addition of new features. The built-in ESP32C3 chip supports 2.4 GHz Wi-Fi connectivity, ensuring stable communication with your Home Assistant system. Additionally, the sensor includes an integrated brightness sensor, which can be used for further automation—for example, adjusting lighting intensity based on ambient light levels.

Technical Specifications

• Power Supply: DC 5V/1A via USB-C
• Radar Frequency: 24 GHz (ISM)
• Operating Temperature: 0 °C to +40 °C
• Operating Humidity: 5-95% RH
• Dimensions: 56 × 55 × 21 mm

GPIO Configuration

• Radar Output: GPIO4
• PIR Output: GPIO3
• Radar Transmitter: GPIO8
• Radar Receiver: GPIO5
• LED: GPIO2
• Button: GPIO9
• BH1750 SDA: GPIO18
• BH1750 SCL: GPIO19

Installation Recommendations

To ensure optimal performance, install the sensor away from air conditioning units, fans, or curtains that could cause interference. Avoid directing the signal toward floors or walls to prevent unwanted reflections. Keep the sensor clean and ensure there is sufficient space around it for proper air circulation.