"Description
The 12V 4-way Bluetooth relay module contains 4 channels of 12V/10A relay module and SPP-C Bluetooth serial slave module, which can be used to control relay switching by sending commands via the mobile phone APP.
Features:
1, on-board high-performance MCU and SPP-C Bluetooth 2.1 slave module;
2, provide blue functional tooth relay control APP;
3, control distance: 10M (empty environment);
4, working voltage: DC12V;
5, On-board 4 12V, 10A/250V AC 10A/30V DC relays, which can continuously pull 100,000 times, with diode escaping protection, short response time;
6, with 4 optocoupler isolation, strong anti-interference ability;
7, onboard Bluetooth status indicator and relay indicator;
8, reserved UART debug interface and MCU program download interface.
Explanation:
Board size: 62.7*63.2mm
Board function description:
1, onboard resources:
IN+, IN-: 12V power input;
TX, RX:UART serial port pin;
5V, GND, SWIM, NRST: Microcontroller program download port.
LED D2/D3/D4/D5 (red light): Relay operation indicator light
LED D1 (blue light): Bluetooth status indicator, described as follows:
(1) Slow flashing means waiting for a connection with the mobile phone;
(2) When it is always on, it means success and establishing a connection with the mobile phone.
Reserved 2 jumper caps: Please plug in the right end (ie RX with RX1 and TX with TX1) in normal use. If you want to use USB to TTL serial port module to debug SPP-C module, please insert it to the left end ( Otherwise there may be interference).
COM1: public end;
NC1: Normally closed, the relay is short-circuited with COM1 before the relay is closed, and it is vacant after being sucked up;
NO1: Normally open, the relay is vacant before being sucked in, and shorted to COM1 after sucking.
COM2: public end;
NC2: Normally closed, the relay is shorted to COM2 before the relay is closed, and it is vacant after being sucked.
NO2: Normally open, the relay is suspended before closing, and shorted to COM2 after pull-in.
COM3: public
NC3: Normally closed, the relay is shorted to COM3 before the relay is closed, and it is vacant after suction.
NO3: Normally open, the relay is suspended before being sucked, and shorted to COM3 after picking up.
COM4: public end;
NC4: Normally closed, short-circuited with COM4 before the relay is closed, and then it is vacant after suction.
NO4: Normally open, the relay is vacant before it is sucked in, and it is short-circuited with COM4 after pull-in.

Relay control instructions (hex hexadecimal):
Open the first relay: A0 01 01 A2
Turn off the first relay: A0 01 00 A1
Open the first relay: A0 02 01 A3
Turn off the first relay: A0 02 00 A2
Open the third relay: A0 03 01 A4
Turn off the third relay: A0 03 00 A3
Open the fourth relay: A0 04 01 A5
Turn off the fourth relay: A0 04 00 A4

1, connected to the power: the module's IN + and IN - respectively connected to the positive and negative 12V power supply
2, use APP control 4 relays
   There are 2 APP options: one is a special APP for Bluetooth relay developed by Alsay Electronics, and the other is a universal APP downloaded by Android App Mall.

Package includes:

1X 12V/10A 4-Channel Bluetooth Relay Module Mobile APP Remote Control Switch
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