KC868-ASR ESP32 SD card sensor record board based on ESP32 chip. It have many hardware resource for you to use. It have two channel relay, two GPIOs for temperature or humidity sensors. one SD card socket and DS3231 high quality RTC chip. It’s very easy for home automation DIY. You can write any code by Arduino IDE to ESP32 module. We will supply demo code for different samples. Everyone can modify and change the code for your own smart home automation system project. it support use by ESPHome for home assistant or tasmota firmware for smart home automation DIY.