Arduino Learning -

Arduino and ISL29125 RGB color light sensor

In this example we look at the ISL29125 RED, GREEN and BLUE color light sensor

Here is some info about the sensor

The ISL29125 is a low power, high sensitivity, RED, GREEN and BLUE color light sensor (RGB) with an I² C (SMBus compatible) interface. Its state-of-the-art photodiode array provides an accurate RGB spectral response and excellent light source to light source variation (LS2LS). The ISL29125 is designed to reject IR in light sources allowing the device to operate in environments from sunlight to dark rooms. The integrating ADC rejects 50Hz and 60Hz flicker caused by artificial light sources. A selectable range allows the user to optimize sensitivity suitable for the specific application.

In normal operation mode the device consumes 56µA, which reduces to 0.5µA in power-down mode. The ISL29125 supports hardware and software user programmable interrupt thresholds. The Interrupt persistency feature reduces false trigger notification. The device operates on supplies (VDD) from 2.25V to 3.63V, I² C supply from 1.7V to 3.63V, and operating temperature across the -40°C to +85°C range.

FEATURES

56µA operating current, 0.5µA shutdown current
Selectable range (Via I²C)
I²C (SMBus compatible) output
ADC resolution 16 bits
Programmable interrupt windows
Two optical sensitivity ranges
Range 0 = 5.7m lux to 375 lux
Range 1 = 0.152 lux to 10,000 lux
Operating power supply 2.25 to 3.63V
I²C power supply 1.7V to 3.63V
6 Ld ODFN (1.65×1.65×0.7mm) package

Connection

Arduino Uno	CJMCU-0401 module
3v3	Vcc
Gnd	Gnd
A4 – SDA	SDA
A5 – SCL	SCL

Parts List

Here are the parts I used

Part name	Link
Arduino Uno	UNO R3 CH340G/ATmega328P, compatible for Arduino UNO

ISL29125 module	ISL29125 Red/Green/Blue RGB Color Light Sensor with IR Blocking Filter Module
Dupont cable	Free shipping Dupont line 120pcs 20cm male to male + male to female and female to female jumper wire Dupont cablefor Arduino

Code

This example requires the https://github.com/sparkfun/SparkFun_ISL29125_Breakout_Arduino_Library

Source code    
#include <Wire.h>
#include "SparkFunISL29125.h"
 
// Declare sensor object
SFE_ISL29125 RGB_sensor;
 
void setup()
{
  // Initialize serial communication
  Serial.begin(115200);
 
  // Initialize the ISL29125 with simple configuration so it starts sampling
  if (RGB_sensor.init())
  {
    Serial.println("Sensor Initialization Successful\n\r");
  }
}
 
// Read sensor values for each color and print them to serial monitor
void loop()
{
  // Read sensor values (16 bit integers)
  unsigned int red = RGB_sensor.readRed();
  unsigned int green = RGB_sensor.readGreen();
  unsigned int blue = RGB_sensor.readBlue();
 
  // Print out readings, change HEX to DEC if you prefer decimal output
  Serial.print("Red: "); Serial.println(red,HEX);
  Serial.print("Green: "); Serial.println(green,HEX);
  Serial.print("Blue: "); Serial.println(blue,HEX);
  Serial.println();
  delay(2000);
}

Output

Open the serial monitor – this is what you should expect to see

Links

Arduino and CJMCU-0401 example

In this example we look at the CJMCU-0401, this is the module in question its a 4-bit Button Capacitive Touch Proximity Sensor With Self-locking Function

Description:

CJMCU-0401 is a touch IC designed with capacitive sensing principle.
Its stable sensing method can be applied to a variety of electronic products, the panel dielectric can be completely insulated material,
designed to replace the traditional mechanical structure switch or ordinary buttons.
Provides four touch inputs and four direct output pins and four LED indicators.

Features:

1. Operating voltage: 2.0V ~ 5.5V
2. The highest power consumption is 11.5uA, low power mode is only 4uA ( in 3V and no load)
3. External configuration pin is set to multiple modes
4. High reliability, the chip built-in debounce circuit, which can effectively prevent external noise interference caused by the malfunction
5. Can be used for glass, ceramics, plastics and other media surface
6. With automatic calibration function, when no keys are touched, the system recalibration cycle is about 4.0 Sec

The CJMCU-0401 uses a CT8224