Characteristics:

• On-board N76E003/STM8S003 and ESP-01 WIFI module
• Having two modes:
  
  • Mode 1: Cell phones carry on the wifi module directly
  • Mode 2: Cell phone and wifi module carry on the same router
    Additional function: As a USB relay module when unplugging the ESP-01
• Transmission distance:
  
  • In the open environment, the maximum transmission distance is 100m when the cell phone carries on the wifi module directly ;
  • when the wifi module and cell phone carrying on the same router, the transmission distance depends on the router’s signal intensity;
• Use Smartconfig technology of ESP8266 to configure the password for the
  ESP-01 module with APP
• 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
• On-board model selection and working position indicator LED
• On-board preserved UART debug interface and MCU program interface
• 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
• LED 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:
  
  •  It means internal self-configuration or lost connection with the router when D6 off
  • It means the ESP-01 are waiting for the APP configure the password for it when D6 fast blink every 0.5S
  • It means the whole configuration is done and waiting for establishing TCP connection with APP when D6 slow blink every 2S
  • It means the TCP connection between ESP-01 and APP is OK when D6 on all the time.
• Relay control command (must be hex format):
• Open the first relay: A0 01 01 A2
• Close the first Relay: A0 01 00 A1
• Open the second relay: A0 02 01 A3
• Close the second Relay: A0 02 00 A2