Description Two Relay Module Arduino Two Relay Module Arduino relay module equipped with an ESP-01 WIFI module and 8-bit high-performance MCU. Characteristics: 1, On-board N76E003/STM8S003 and ESP-01 WIFI module 2, Having two modes: (1) Mode 1: Cell phones carry on the wifi module directly (2) Mode 2: Cell phone and wifi module carry on the same router Additional function: As a USB relay module when unplugging the ESP-01 3, Transmission distance: In the open environment, the maximum transmission distance is 100m when the cell phone carry on the wifi module directly ; when the wifi module and cell phone carrying on the same router, the transmission distance depend on the router’s signal intensity; 4, Use Smartconfig technology of ESP8266 to configure the password for the ESP-01 module with APP 5, On-board 5V, 10 A / 250 v AC 10 A / 30 v DC relay, absorb 100000 times continuously, Module with diode effusion protection, short response time 6, On-board model selection and working position indicator LED 7, On-board preserved UART debug interface and MCU program interface 8, Size: 59*40mm Interface and sources: IN , IN-: 5V power input TX, RX: UART communication SWIM, NRST: MCU program interface S1: Mode selection key, default is mode 1 S2: Restore key D2 and D4(red): Relay indicator LED D7(red): Mode 1 indicator LED D5(blue): Mode 2 indicator LED D6(green): Working state indicator, the description of D6 as below: LED (1) It means internal self-configuration or lost connection with the router when D6 off (2) It means the ESP-01 are waiting for the APP configure the password for it when D6 fast blink every 0.5S (3) It means the whole configuration is done and waiting for establishing TCP connection with APP when D6 slow blink every 2S (4) It means the TCP connection between ESP-01 and APP is OK when D6 on all the time.
