This tutorial will help you quickly understand and use the STH1023 UV/light sensor module. It covers register settings, serial communication, and example commands in clear English.

1. Register Map

Address Name Description Default
0x00 Device ID 1~254; 0=broadcast; default 0xA4 (must be even, matches 8-bit I2C address) 0xA4
0x01 Baud Rate 0~8: 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400; default 9600 9600
0x02 Update Rate 0:1Hz; 1:5Hz; 2:10Hz; default 10Hz 10Hz
0x03 Output Mode 0: Continuous (default); 1: Query 0
0x04 Output Format 0: Hex (default); 1: Character 0
0x05 Save Settings 0x55: Save config; 0xAA: Factory reset
0x06 Analog Range 0: 0~49999lux; 1: 50000~99999lux; 2: 100000~159999lux; 3: 0~159999lux (default) 3
0x07 ALS_Wfac 0~256: 0~2.56; brightness glass factor (value × 100)
0x08 UVI_Wfac 0~256: 0~2.56; UV glass factor (value × 100)
0x09 UVI_H_data UVI = (UVI_H_data << 8 UVI_L_data) / 100
0x0A UVI_L_data See above
0x0B ALS_H_data Lux = (ALS_H_data << 16 ALS_M_data << 8
0x0C ALS_M_data See above
0x0D ALS_L_data See above
0x0E Firmware Info 0~255

2. Serial Communication

Frame Structure

Address Function Data Checksum
1 byte 1 byte N Low 8 bits of sum

Supported Functions

Function Code
Write Register 0x06
Read Register 0x03

Response Time

Baud Rate Response
9600 ~10ms
115200 ~1ms

3. Example Commands

Set Baud Rate to 115200

Send: 

A4 06 01 06 B1
| A4 | 06 | 01 | 06 | B1 | |----|----|----|----|----| | Addr | Write | Reg | Data | Checksum |

Response: 

A4 06 01 06 B1

Set Update Rate to 10Hz

Send: 

A4 06 02 02 AE
| A4 | 06 | 02 | 02 | AE | |----|----|----|----|----| | Addr | Write | Reg | Data | Checksum |

Response: 

A4 06 02 02 AE

Read Registers

Send: 

A4 03 09 05 B5
| A4 | 03 | 09 | 05 | B5 | |----|----|----|----|----| | Addr | Read | Start Reg | Count | Checksum |

Response Example: 

A4 03 09 05 0001008B08 49
| A4 | 03 | 09 | 05 | [Values] | 49 | |----|----|----|----|----------|----| | Addr | Read | Start Reg | Count | Data | Checksum |

4. Output Modes

Continuous Output

  1. Set output mode register (0x03) to 0.
  2. Send read data frame (set start register and count).

Query Output

  1. Set output mode register (0x03) to 1.
  2. Send read data frame each time you want data.

Note: Output format is set by the read data frame. Mode is set by register 0x03.

5. PC Software Usage

  • Use Board-dat/STH/STH1023-dat/GY_UVI.zip for Windows.
  • Select the COM port connected to the module, baud rate, and ID (default 0xA4, or 0x00 if unknown).
  • Config reg: This section corresponds to configurable registers. After changing any register, press Enter or click elsewhere to write the config to the module.
  • Read reg: This section is for reading module registers. Set the start register and number of registers to read, then click "read" to send the command.

Continuous Mode

  1. Set start register and number of registers to read.
  2. Set update rate.
  3. Set mode to continuous.

Query Mode

  1. Set start register and number of registers to read.
  2. Set update rate.
  3. Set mode to query.
  4. For each query, repeat step 1 (send read register frame).

6. Arduino Example

Related

arduino

Table of Contents

https://www.electrodragon.com