The design is very simple it is based on a ESP8266 development board like: The circuit has a very few components: J1 – a 3 contact terminal strip for power and the output from the RFID reader R1 – a 3.3K 1/4 watt resistor R2 – a 6.8K 1/4 watt resistor, R1 and R2 protect … Continue reading MQTT WiFi RFID Reader