KC868-A2 esp32 4G relay board based on ESP32 wifi chip, many hardware resource for you to use. it support GSM module for SMS, voice call, GPRS communication. Support 4G SIM7600 module or 2G SIM800L module. Use SMS or call to turn ON/OFF relay will be very easy for home automation DIY. You can write any code by Arduino IDE to ESP32 wifi/bluetooth/ethernet RS485 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.
Related technical information
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schematic: https://www.kincony.com/download/KC868-A2-schematic.pdf
ESP32 I/O pin define: https://www.kincony.com/forum/showthread.php?tid=2691
config yaml file for home assistant: https://www.kincony.com/forum/showthread.php?tid=2692
arduino demo source code: https://www.kincony.com/forum/forumdisplay.php?fid=43
KCS v2 firmware online guide: https://www.kincony.com/esp32-kcsv2-firmware.html
KCS v2 function explanation video tour: https://youtu.be/-DexVHAxPUM
