ARM Learning

OPT3001 Digital Ambient Light Sensor and Arduino example

In this example we will connect an OPT3001 to an Arduino Due

The OPT3001 is a sensor that measures the intensity of visible light. The spectral response of the sensor tightly matches the photopic response of the human eye and includes significant infrared rejection.

The OPT3001 is a single-chip lux meter, measuring the intensity of light as visible by the human eye. The precision spectral response and strong IR rejection of the device enables the OPT3001 to accurately meter the intensity of light as seen by the human eye regardless of light source. The strong IR rejection also aids in maintaining high accuracy when industrial design calls for mounting the sensor under dark glass for aesthetics. The OPT3001 is designed for systems that create light-based experiences for humans, and an ideal preferred replacement for photodiodes, photoresistors, or other ambient light sensors with less human eye matching and IR rejection.

Measurements can be made from 0.01 lux up to 83k lux without manually selecting full-scale ranges by using the built-in, full-scale setting feature. This capability allows light measurement over a 23-bit effective dynamic range.

The digital operation is flexible for system integration. Measurements can be either continuous or single-shot. The control and interrupt system features autonomous operation, allowing the processor to sleep while the sensor searches for appropriate wake-up events to report via the interrupt pin. The digital output is reported over an I2C- and SMBus-compatible, two-wire serial interface.

Features

Precision Optical Filtering to Match Human Eye:
- Rejects > 99% (typ) of IR
Automatic Full-Scale Setting Feature Simplifies Software and Ensures Proper Configuration
Measurements: 0.01 lux to 83 k lux
23-Bit Effective Dynamic Range With
Automatic Gain Ranging
12 Binary-Weighted Full-Scale Range Settings:
< 0.2% (typ) Matching Between Ranges
Low Operating Current: 1.8 µA (typ)
Operating Temperature Range: –40°C to +85°C
Wide Power-Supply Range: 1.6 V to 3.6 V
5.5-V Tolerant I/O

Connection

Arduino Due	CJMCU-3001
3.3v	Vcc
Gnd	Gnd
SDA	SDA
SCL	SCL

Code

This example uses the following library https://github.com/closedcube/ClosedCube_OPT3001_Arduino

Source code

/*
 
This is example for ClosedCube OPT3001 Digital Ambient Light Sensor breakout board 
 
Initial Date: 02-Dec-2015
 
Hardware connections for Arduino Uno:
VDD to 3.3V DC
SDA to A4
SCL to A5
GND to common ground
 
Written by AA for ClosedCube
 
MIT License
 
*/
 
#include <Wire.h>
#include <ClosedCube_OPT3001.h>
 
ClosedCube_OPT3001 opt3001;
 
#define OPT3001_ADDRESS 0x44
 
void setup()
{
	Serial.begin(9600);
	Serial.println("ClosedCube OPT3001 Arduino Test");
 
	opt3001.begin(OPT3001_ADDRESS);
	Serial.print("OPT3001 Manufacturer ID");
	Serial.println(opt3001.readManufacturerID());
	Serial.print("OPT3001 Device ID");
	Serial.println(opt3001.readDeviceID());
 
	configureSensor();
	printResult("High-Limit", opt3001.readHighLimit());
	printResult("Low-Limit", opt3001.readLowLimit());
	Serial.println("----");
}
 
void loop()
{
	OPT3001 result = opt3001.readResult();
	printResult("OPT3001", result);
	delay(500);
}
 
void configureSensor() {
	OPT3001_Config newConfig;
 
	newConfig.RangeNumber = B1100;	
	newConfig.ConvertionTime = B0;
	newConfig.Latch = B1;
	newConfig.ModeOfConversionOperation = B11;
 
	OPT3001_ErrorCode errorConfig = opt3001.writeConfig(newConfig);
	if (errorConfig != NO_ERROR)
		printError("OPT3001 configuration", errorConfig);
	else {
		OPT3001_Config sensorConfig = opt3001.readConfig();
		Serial.println("OPT3001 Current Config:");
		Serial.println("------------------------------");
 
		Serial.print("Conversion ready (R):");
		Serial.println(sensorConfig.ConversionReady,HEX);
 
		Serial.print("Conversion time (R/W):");
		Serial.println(sensorConfig.ConvertionTime, HEX);
 
		Serial.print("Fault count field (R/W):");
		Serial.println(sensorConfig.FaultCount, HEX);
 
		Serial.print("Flag high field (R-only):");
		Serial.println(sensorConfig.FlagHigh, HEX);
 
		Serial.print("Flag low field (R-only):");
		Serial.println(sensorConfig.FlagLow, HEX);
 
		Serial.print("Latch field (R/W):");
		Serial.println(sensorConfig.Latch, HEX);
 
		Serial.print("Mask exponent field (R/W):");
		Serial.println(sensorConfig.MaskExponent, HEX);
 
		Serial.print("Mode of conversion operation (R/W):");
		Serial.println(sensorConfig.ModeOfConversionOperation, HEX);
 
		Serial.print("Polarity field (R/W):");
		Serial.println(sensorConfig.Polarity, HEX);
 
		Serial.print("Overflow flag (R-only):");
		Serial.println(sensorConfig.OverflowFlag, HEX);
 
		Serial.print("Range number (R/W):");
		Serial.println(sensorConfig.RangeNumber, HEX);
 
		Serial.println("------------------------------");
	}
 
}
 
void printResult(String text, OPT3001 result) {
	if (result.error == NO_ERROR) {
		Serial.print(text);
		Serial.print(": ");
		Serial.print(result.lux);
		Serial.println(" lux");
	}
	else {
		printError(text,result.error);
	}
}
 
void printError(String text, OPT3001_ErrorCode error) {
	Serial.print(text);
	Serial.print(": [ERROR] Code #");
	Serial.println(error);
}

Output

Open the serial monitor and you should see something like this

OPT3001: 248.16 lux
OPT3001: 19.08 lux
OPT3001: 12.85 lux
OPT3001: 18.91 lux
OPT3001: 230.24 lux
OPT3001: 218.64 lux
OPT3001: 15.07 lux
OPT3001: 53.40 lux
OPT3001: 173.28 lux
OPT3001: 145.44 lux

Link

OPT3001 CJMCU-3001 ambient light sensor eye like measurement light intensity single chip illumination meter

Arduino Due and BMI160 sensor example

The BMI160 is a small, low power, low noise 16-bit inertial measurement unit designed for use in mobile applications like augmented reality or indoor navigation which require highly accurate, real-time sensor data.

In full operation mode, with both the accelerometer and gyroscope enabled, the current consumption is typically 950 μA, enabling always-on applications in battery driven devices. It is available in a compact 14-pin 2.5 x 3.0 x 0.8 mm³ LGA package.

Parameter	Technical data
Digital resolution	Accelerometer (A): 16 bit Gyroscope (G): 16bit
Measurement ranges (programmable)	(A): ± 2 g, ± 4 g, ± 8 g, ± 16 g (G): ± 125°/s, ± 250°/s, ± 500°/s, ± 1000°/s, ± 2000°/s
Sensitivity (calibrated)	(A): ±2g: 16384LSB/g ±4g: 8192LSB/g ±8g: 4096LSB/g ±16g: 2048LSB/g (G): ±125°/s: 262.4 LSB/°/s ±250°/s: 131.2 LSB/°/s ±500°/s: 65.6 LSB/°/s ±1000°/s: 32.8 LSB/°/s ±2000°/s: 16.4 LSB/°/s
Zero-g offset (typ., over life-time)	(A): ±40mg (G): ± 10°/s
Noise density (typ.)	(A): 180 μg/√Hz (G): 0.008 °/s/√Hz
Bandwidths (programmable)	1600 Hz … 25/32 Hz
Digital inputs/outputs	SPI, I²C, 4x digital interrupts
Supply voltage (VDD)	1.71 … 3.6 V
I/0 supply voltage (VDDIO)	1.2 … 3.6 V
Temperature range	-40 … +85°C
Current consumption – full operation – low-power mode	950 μA 3 μA
FIFO data buffer	1024 byte
LGA package	2.5 × 3.0 × 0.8 mm³
Shock resistance	10,000 g x 200 μs

Connection

Arduino Due	Module Pin
3v3	3v3
Gnd	Gnd
SDA/21	SDA
SCL/20	SCL

Arduino Due Module Pin

Code

This example used the following library – https://github.com/hanyazou/BMI160-Arduino

Source code

#include <BMI160Gen.h>
 
const int select_pin = 10;
const int i2c_addr = 0x69;
 
void setup() {
Serial.begin(9600); // initialize Serial communication
while (!Serial); // wait for the serial port to open
 
// initialize device
//BMI160.begin(BMI160GenClass::SPI_MODE, select_pin);
BMI160.begin(BMI160GenClass::I2C_MODE, i2c_addr);
}
 
void loop() {
int gx, gy, gz; // raw gyro values
 
// read raw gyro measurements from device
BMI160.readGyro(gx, gy, gz);
 
// display tab-separated gyro x/y/z values
Serial.print("g:\t");
Serial.print(gx);
Serial.print("\t");
Serial.print(gy);
Serial.print("\t");
Serial.print(gz);
Serial.println();
 
delay(500);
}

Output

Open the serial monitor

g: 90 86 9
g: 69 69 40
g: 35 97 -9
g: -7370 3961 -1786
g: -31829 -2652 32767
g: -3221 25109 32767
g: 26020 31878 -26125
g: -20332 -21698 -15712
g: -7297 3463 -1723
g: -1137 1521 420
g: -203 305 96
g: 144 -102 54
g: 77 116 35

Links

https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMI160-DS000-07.pdf

BMI160 Latest Stance Accelerometer Gyroscope module 6 Dof inertial Measurement Sensors

Arduino Due and OLED display example

This example uses an OLED display these typically come in a couple of different sizes 128×32 and 128×64, this particular example will use the I2C connection from the Micro:bit to the display. There are a couple of libraries that make life easier.

Lets look at a typical oled display

These will come in useful for various projects for example displaying the date and time or maybe temperature readings from a sensor

Connection

Pin Label	Arduino PIN	I²C Function	Notes
GND	Ground	Ground	0V
VCC	Power	Power	Regulated 5V supply.
SDA	SDA / 20	SDA	Serial data in
SCL	SCL / 21	SCL	I²C clock

This layout shows a 128×32 connected to the Arduino Due, 128×64 I2C devices would be the same

Code

This example uses the https://github.com/adafruit/Adafruit_SSD1306/archive/master.zip and https://github.com/adafruit/Adafruit-GFX-Library/archive/master.zip , theer are several built in examples. I have modified one just to display text as further examples will write text to a display

Source code

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define OLED_RESET 4
 
Adafruit_SSD1306 display(OLED_RESET);
 
void setup()   
{                  
  Serial.begin(9600);   
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 128x32)  // init done  
  display.clearDisplay();  // text display tests  
  display.setTextSize(1);  
  display.setTextColor(WHITE);  
  display.setCursor(0,0);  
  display.println("Hello, world!");  
  display.setTextColor(BLACK, WHITE); // &#039;inverted&#039; text  
  display.println(3.141592);  
  display.setTextSize(2);  
  display.setTextColor(WHITE);  
  display.print("0x");   
  display.println(0xDEADBEEF, HEX);  
  display.display();  
  display.clearDisplay();
}
 
void loop() 
{  
}

Link

1Pcs 128X64 OLED LCD LED Display Module For Arduino 0.96″ I2C IIC SPI Serial new original

Arduino Due and ADXL335 accelerometer example

The ADXL335 is a small, thin, low power, complete 3-axis accelerometer with signal conditioned voltage outputs. The product measures acceleration with a minimum full-scale range of ±3 g. It can measure the static acceleration of gravity

in tiltsensing applications, as well as dynamic acceleration resulting from motion, shock, or vibration.

The user selects the bandwidth of the accelerometer using the CX, CY, and CZ capacitors at the XOUT, YOUT, and ZOUT pins. Bandwidths can be selected to suit the application, with a range of 0.5 Hz to 1600 Hz for X and Y axes, and a range of 0.5 Hz to 550 Hz for the Z axis.

Here is a typical module that makes it easy to work with the ADXL335

Features:

Name: ADXL335 module (triaxial accelerometer analog output)
Model: GY-61
Power supply :3-5v
Analog X, Y, Z three-axis output

Schematic

The following layout shows how to wire the ADXL335 module up to an Arduino Due

arduino due and adxl335

Code

No libraries required for this example

Source code

const int xpin = A0; // x-axis of the accelerometer
const int ypin = A1; // y-axis
const int zpin = A2; // z-axis
 
void setup()
{
Serial.begin(9600);
}
 
void loop()
{
int x = analogRead(xpin); //read from xpin
delay(1); //
int y = analogRead(ypin); //read from ypin
delay(1); 
int z = analogRead(zpin); //read from zpin
 
float zero_G = 512.0; //ADC is 0~1023 the zero g output equal to Vs/2
float scale = 102.3; //ADXL335330 Sensitivity is 330mv/g
//330 * 1024/3.3/1000
Serial.print(((float)x - 331.5)/65*9.8); //print x value on serial monitor
Serial.print("\t");
Serial.print(((float)y - 329.5)/68.5*9.8); //print y value on serial monitor
Serial.print("\t");
Serial.print(((float)z - 340)/68*9.8); //print z value on serial monitor
Serial.print("\n");
delay(1000); //wait for 1 second 
}

Output

Open the serial monitor and you should see something like this

83.00 86.34 85.61
88.28 77.76 76.67
90.69 75.47 74.36
90.54 75.32 74.51
35.20 12.95 21.04
36.41 15.09 21.91
29.48 11.23 19.17
43.50 15.24 18.74
19.52 2.79 34.59
35.51 14.09 22.77
35.66 14.24 22.48

Links

http://www.analog.com/media/en/technical-documentation/data-sheets/ADXL335.pdf

The sensor costs under $2

GY-61 ADXL335 Module Triaxial Acceleration Gravity Angle Sensor

Arduino Due and Ws2812b example

WS2812 is a intelligent control LED light source that the control circuit and RGB chip are integrated in a package of 5050 components. It internal include intelligent digital port data latch and signal reshaping amplification drive circuit. Also include a precision internal oscillator and a 12V voltage programmable constant current control part, effectively ensuring the pixel point light color height consistent.

The data transfer protocol use single NZR communication mode. After the pixel power-on reset, the DIN port receive data from controller, the first pixel collect initial 24bit data then sent to the internal data latch, the other data which reshaping by the internal signal reshaping amplification circuit sent to the next cascade pixel through the DO port. After transmission for each pixel，the signal to reduce 24bit. pixel adopt auto reshaping transmit technology, making the pixel cascade number is not limited the signal transmission, only depend on the speed of signal transmission.

LED with low driving voltage, environmental protection and energy saving, high brightness, scattering angle is large, good consistency, low power, long life and other advantages. The control chip integrated in LED above becoming more simple circuit, small volume, convenient installation.

I tested this with 3.3v and 5v, both seemed to work OK. 5v is closer to the spec.

This is the breakout I used

Layout

arduino due and ws2812

Code

This requires the Adafruit neopixel library which you can find in the library manager of the Arduino IDE and easily add it

Source code

#include <Adafruit_NeoPixel.h>
 
#define PIN 2
 
// When we setup the NeoPixel library, we tell it how many pixels, and which pin to use to send signals.
// Note that for older NeoPixel strips you might need to change the third parameter--see the strandtest
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(1, PIN, NEO_GRB + NEO_KHZ800);
 
void setup() 
{
  pixels.begin(); // This initializes the NeoPixel library.
}
 
void loop() 
{
 
  // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
  for (int i = 0; i < 2; i++) {
    for (int j = 0; j < 2; j++) {
      for (int k = 0; k < 2; k++) {
 
        pixels.setPixelColor(0, pixels.Color(i * 255, j * 255, k * 255)); // Moderately bright green color.
        pixels.show(); // This sends the updated pixel color to the hardware.
        delay(200); // Delay for a period of time (in milliseconds).
      }
    }
  }
}

Link

very low cost breakout, under $0.35 for one of these

New WS2812 RGB LED Breakout module For arduino

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