Vox - Web Bluetooth - Remote SP110E LED controller

Demo link: https://nguyenthuongvo.github.io/Vox

• Work well on Chrome (Linux), Bluefly (iOS)
• It works on Chrome (Windows, Android), but I didn't test it
• On Linux/Windows, you have to turn Experimental Web Platform features and Use the new permissions backend for Web Bluetooth in chrome://flags

Feature

• Scan devices
• Get device (SP110E) info
• Set IC Model
• Set RGB Chanel
• Set Led num (1 -1024)
• Change preset (1-120)
• Change static color
• Change speed
• Change brightness
• Change device name (max 10 chars)

Technical document

1. Command

All command send to SP110E has 4 bytes, 3 bytes is data and last byte is command.

4 bytes must be HEX code NO SPACE BETWEEN byte.
(Video) How to test command: https://www.youtube.com/watch?v=IN22t3pKAs0

Command	Command	Data	Return/Response
CHECK DEVICE	D7 F3 A1 D5	3 BYTES	13 BYTES
GET DEVICE INFO	00 00 00 10		12 BYTES
SET IC MODEL	03 00 00 1C	1 BYTES
SET RGB SEQUENCE	04 00 00 3C	1 BYTES
SET LED NUM	01 6A 00 2D	2 BYTES
SET DEVICE NAME	08 00 00 BB {DATA}	1-8 BYTES	SP110E RESET
TURN ON	00 00 00 AA
TURN OFF	00 00 00 AB
SET STATIC COLOR	00 FF FF 1E	3 BYTES
SET BRIGHT	FF 00 00 2A	1 BYTES
SET WHITE	FF 00 00 69	1 BYTES
SET PRESET	3F 00 00 2C	1 BYTES
SET SPEED	C6 00 00 03	1 BYTES
SET AUTO MODE	00 00 00 06

2. Notices

[CHECK DEVICE] command response (Hex Format)

Return: 13 bytes data

Index	Data
0	Checksum
1	Status
2	Preset
3	Speed
4	Brightness
5	IC model
6	Channel
7	Pixel count MSB
8	Pixel count LSB
9	Red
10	Green
11	Blue
12	White

[GET INFO] command response (Hex Format)

Return: 12 bytes data

Index	Data
0	Status
1	Preset
2	Speed
3	Brightness
4	IC model
5	Channel
6	Pixel count MSB
7	Pixel count LSB
8	Red
9	Green
10	Blue
11	White

LED NUM: Have to concain [7] + [8] to get expect number.

How to process value right way:
[7][8] Index: 0100 -> parse int from hex value -> parseInt(0100, 16) -> 256 led num

3. Example

Javascript (Web Bluetooth)
Turn on

	let hex = "000000AA"; 
    let typedArray = new Uint8Array(hex.match(/[\da-f]{2}/gi).map(function (h) {
      return parseInt(h, 16)
    }))
    return characteristic.writeValue(typedArray.buffer);

4. Using ESP32 fake SP110E check command

Something I need debug command (like led num) so I had to fake SP100E firmware to capture command.

The difficult is CHECKSUM, Have to pass checksum for receiving led num command or static color command.

Example: Source code location: PlatformIO/ESP32BLE
When ESP32 receive data:

D7 F3 A1 D5

ESP32 need to send

byte dataArrays[] = { 0xFF, 0x01, 0x79 , 0x7D, 0x8A, 0x03 , 0x02, 0x00, 0x09 , 0xFF, 0x00, 0x00 , 0x00 };
dataArrays[0] = (byte) (rec[2] | ((rec[0] << 1) & 254 & 105) | rec[1]); // Checksum device

5. Troubleshoot request device function error on Bluefly browser

Bluefly bowser raises requestDevice error if include optionalServices so we need to remove it.

Reference

https://gist.github.com/mbullington/37957501a07ad065b67d4e8d39bfe012