Grove : capteur numÃ©rique de lumiÃ¨re

De Wikidebrouillard.

Version du 22 octobre 2013 à 13:44

Sommaire

1 Introduction
2 Features
3 Specifications
4 Interface Function
5 TSL2561 Functional Block Diagram
6 Usage
7 Reference
- 7.1 Register Map
- 7.2 Spectrum Response Curve
8 Version Tracker
9 Resource
10 Support
11 Crédits

Introduction

This module is based on the I2C light-to-digital converter TSL2561 to transform light intensity to a digital signal. Different from traditional analog light sensor, as Grove - Light Sensor, this digital module features a selectable light spectrum range due to its dual light sensitive diodes: infrared and full spectrum.

You can switch among three detection modes to take your readings. They are infrared mode, full spectrum and human visible mode. When running under the human visible mode, this sensor will give you readings just close to your eye feelings.

Features

Selectable detection modes
High resolution 16-Bit digital output at 400 kHz I2C Fast-Mode
Wide dynamic range: 0.1 - 40,000 LUX
Wide operating temperature range: -40°C to 85°C
Programmable interrupt function with User-Defined Upper and lower threshold settings

Specifications

Items	Min Type Max	Unit
Supply voltage, VDD	3.3 5 5.1	V
Operating temperature	-30 \ 70	℃
SCL,SDA input low voltage	-0.5 \ 0.8	V
SCL,SDA input high voltage	2.3 \ 5.1	V

Interface Function

U1: TSL2561 IC, Light-To-Digital Converter.
U3: XC6206MR332 IC, Positive Voltage Regulators.
Q1,Q2: BSN20 IC, N-channel Enhancement Mode Vertical D-MOS Transistor.
SCL,SDA: I2C Signal Interface

TSL2561 Functional Block Diagram

Usage

1. Plug the Grove - Digital Light Sensor onto the I2C port on Grove - Base Shield, and then plug the base shield onto Arduino;

2. Download the library file:Digital Light Sensor Library;

3. Unzip it into the libraries file of Arduino IDE by the path: ..\arduino-1.0.1\libraries.

4. Create an Arduino sketch and paste the following codes to it or open the code directly by the path:File -> Example ->Digital_Light_Sensor->Digital_Light_Sensor.

  
/* Digital Light sensor demo V1.0
* Connect the sensor to I2C port of Arduino to use.
*
* By:http://www.seeedstudio.com
*/
#include <Wire.h>
#include <Digital_Light_TSL2561.h>
void setup()
{
  Wire.begin(); 
  Serial.begin(9600);
  TSL2561.init(); 
}

void loop()
{  
  unsigned long  Lux;
  TSL2561.getLux();
  Serial.print("The Light value is: ");
  Serial.println(TSL2561.calculateLux(0,0,1));
  delay(1000);
  }

5. Upload the code. Please click here if you do not know how to upload.
6. Open the serial monitor to see the result.

In the case of completely light matte, The output result is 0.

Reference

Register Map

The TSL2561 is controlled and monitored by sixteen registers (three are reserved) and a command register accessed through the serial interface. These registers provide for a variety of control functions and can be read to determine results of the ADC conversions. The register set is summarized as show below.

Spectrum Response Curve

Two channels of the digital light sensor have different response characteristic. That's why you can choose its working mode by having both of them on or one of them off.