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You can modify the Bluetooth name and PIN(Access Password) use " UST to TTL232", For details, see file " Bluetooth parameter modification"
Parameter
1. Operating voltage: DC 12V
2. External relay is required to play a switching function
3. Bluetooth name is QS-8RELAY password:123456
4. Revise the name fD 02 ef + The total length is 1 bytes + length + Device name byte (The longest is 10 bytes) + length + matching password（PIN the longest is 6 bytes）+ 5d
（such as:revise equipment name: QS-RELAY matching password:1234 send: FD 02 EF 0F 0851 53 2D 52 45 4C 41 590431 32 33 345D）
Modify successfully:df ff 00 00 5d Modify failed, No response:df 00 00 00 5d
First, APP sends the name of the device to be modified, disconnects the Bluetooth connection, resets the Bluetooth module after the hardware is received, delays a few seconds, and then configure the Bluetooth device.
1. 8 channels free control, automatic connection function, no cumbersome operation.
2. Support only android phones with Bluetooth 4.0.
3. You can modify the Bluetooth name and PIN(Access Password) through AT commands.
4. Operating voltage: DC 12V.
5. Operating Current: Standby current (all relays closed) 15MA, 1 relay open 41MA, 2 relays open 69MA, 3 relays open 96MA, 4 relays open 123MA, 5 relays open 150MA, 6 relays open 177MA,7 relays open 203MA, 8 relays open 229MA.
6. Send commands via Android Bluetooth APP control relay turned on and off (we provide Bluetooth APP, you can also use your own APP to control relays, sending commands to control.
7. "Momentary" "Self-locking" "Interlock" "open" "close" 5 Commands.
8 way control code table
1 way open: FD 02 20 01 01 5D
1 way Close: FD 02 20 01 00 5D
2 way open: FD 02 20 02 01 5D
2 way Close: FD 02 20 02 00 5D
3 way open: FD 02 20 03 01 5D
3 way Close: FD 02 20 03 00 5D
4 way open: FD 02 20 04 01 5D
4 way Close: FD 02 20 04 00 5D
5 way open: FD 02 20 05 01 5D
5 way Close: FD 02 20 05 00 5D
6 way open: FD 02 20 06 01 5D
6 way Close: FD 02 20 06 00 5D
7 way open: FD 02 20 07 01 5D
7 way Close: FD 02 20 07 00 5D
8 way open: FD 02 20 08 01 5D
8 way Close: FD 02 20 08 00 5D
1-8 way open: FD 02 20 EF FF 5D
1-8 way Close: FD 02 20 EF 00 5D
Esc DF FD XX XX 5D //XXXXThere are 16 persons, 1 for open and 0 for Close
B Brown
2025-08-22 10:32:01
Just shows up in a box - no directions or power supply.I used a 5V DC power supply to turn it on. But it needs 12V DC to power the relays.Pairing worked OK on my Android phone - password is 1234, not 123456.Writing an Android app is not too bad.- Do the usual Bluetooth permission stuff - "android.permission.BLUETOOTH_CONNECT"- Get the device: private void initBluetooth() { BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); Set pairedDevices = mBluetoothAdapter.getBondedDevices(); for (BluetoothDevice device : pairedDevices) { if (device.getName().equals("BT04-A")) { mDevice = device; break; } } }- Write the hex bytes to turn things on and off. iRelay is 1-8, iOnOff is 1 for on, 0 for off: private void ToggleRelay(int iRelay, int iOnOff) { try { BluetoothSocket sx = mDevice.createRfcommSocketToServiceRecord(UUID.fromString(UUID.randomUUID().toString())); Class clazz = sx.getRemoteDevice().getClass(); Class[] paramTypes = new Class[]{Integer.TYPE}; Method mx = clazz.getMethod("createRfcommSocket", paramTypes); Object[] params = new Object[]{1}; sx = (BluetoothSocket) mx.invoke(sx.getRemoteDevice(), params); assert sx != null; sx.connect(); byte[] bytes = new byte[] { (byte)0xFD, 0x02, 0x20, (byte)iRelay, (byte)iOnOff, 0x5d }; sx.getOutputStream().write(bytes); sx.close(); } catch (Exception ex) { } }The relays are latching so once you toggle them they stay that way indefinitely.
Paladin
2025-07-29 17:42:31
Search Internet for information on this board and look at the complete description for basic knowledge on how to operate. No issues for me and I've purchased 2 so far for my home automation projects. Good value.
Cody K
2025-07-20 12:28:40
Do not buy from this company I've spent 3 days trying to get info with no results. Cards do not come set up ready to run. What a joke
Aaron
2025-05-18 12:41:34
Product comes in a bubble wrap bag with static foil... no other packaging. No instructions either... reached out to seller but they "are out of the office these days".....after spending about 4 nights digging the internet, I found some guy on YouTube in a far away land speaking a different language but I just copied what he did and great success. You need to download BlueSPP from play store. Link Bluetooth... once connected go to preferences and turn on both send and receive hex data. Long press a switch and click hex on both on and off and enter the appropriate FD..... code in the picture I have shared to the line. Haven't found any other app that is better than this yet. Will continue to look.
Blackstar
2024-12-28 16:31:47
The board work fine. Momentarily is working with BlueSPP, couldn't figure it out any other way. But it's fine because this is the app I use anyway. Be nice to get a App from the Manufacturer though.
Sean From Florida
2024-12-10 15:15:32
The commands to send to the controller are in the listing (e.g FD022001015D for relay 1 on).Other things to help speed up development...The peripheral name is "BT04-A". The (only) service UUID for this device is "FFE0". The characteristic for writing to this device is "FFE2". Also - you must send the commands as hexidecimal, not a string!
Juan Aguilera
2024-12-03 18:51:26
Works great, but I will live to have the codes for a momentary switch and nit only lock switch. To create a couole of extra push bottom to switch 2 relay groul and not all at the same time ON/OFF. other than that it works well with the commands provided on the seller description....
Customer
2024-11-19 17:25:44
Will not connect to any app i download and they stated that it had an app that came with it and did not the thing is use less!
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