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Close the fourth relay: A0 04 00 A4 Parameter: Onboard processor: STM8S103 and ESP-01WIFI module Operating mode: Mode 1: The mobile phone is directly mounted on the WIFI module; Mode 2: The mobile phone and WIFI module are loaded on the router at the same time; Additional function: It can also be used as a USB relay when ESP-01 is unplugged. Transmission Distance: (1) In an open environment, when the mobile phone is mounted on the win module, the maximum stable transmission distance is 100m; (2) When the WIFI module and mobile phone are installed on the router at the same time, the transmission distance depends on the signal strength of the router. Function: Use Smartconfig technology to complete ESP-01 on mobile phone APP WIFI module account password configuration, the configured account and password have power-off memory function; Onboard: 10A / 250V AC 10A / 30V DC relay, which can be connected 100,000 times continuously, With two-pole effusion protection, short response time; on-board mode selection and real-time working status indicator. Reserved: UART debugging interface and STM8 SWIM program download interface Suitable for mobile phones: Android phones, not for Apple phones 1 Way relay module 5v/12v IN +, IN-: 5V / 12V power input; TX, RX: UART serial port pins; 5V / 12V, GND, SWIM, NRST: STM8S microcontroller program download port Button S1: mode switch, the default is mode 1 Button S2: Restore factory settings LED D2 and D4 (red light): relay working indicator, light when open LED D7 (red light): Mode 1 indicator LED D5 (blue light): Mode 2 indicator LED D6 (green light): working status indicator, described as follows: (1) When off, it means that it is self-configuring or loses connection with the router; (2) When flashing at 0.5S, it means waiting for the APP to configure a WIFI acco