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Arduino

enviro:bit and micro:bit TCS3472 arduino example

by shedboy71

Sense the world around you with enviro:bit! It’s loaded with sensors for air and weather, colour and light, and sound, and slots right onto your microbit.

Just slot in your micro:bit, then code enviro:bit with the block-based Microsoft MakeCode editor, or with MicroPython in the Mu code editor.

The sensors go hand-in-hand really well with the LED matrix on micro:bit, letting you graph sensors readings or have the LEDs react to sound, for example.

Features:

  • Comes fully-assembled and ready to use.
  • BME280 temperature, pressure, and humidity sensor.
  • TCS3472 light and colour sensor.
  • MEMS microphone.
  • Compatible with micro:bit.
  • Microsoft MakeCode and MicroPython support.
  • No soldering required!

Lets look at the TCS34725

The TCS3472 device provides a digital return of red, green, blue (RGB), and clear light sensing values. An IR blocking filter, integrated on-chip and localized to the color sensing photodiodes, minimizes the IR spectral component of the incoming light and allows color measurements to be made accurately.

The high sensitivity, wide dynamic range, and IR blocking filter make the TCS3472 an ideal color sensor solution for use under varying lighting conditions and through attenuating materials. This data is transferred via an I2C to the host.

Features

  • Integrated IR blocking filter
  • 3.8M:1 dynamic range
  • Four independent analog-to-digital converters
  • A reference channel for color analysis (clear channel photodiode)

Benefits

  • Minimizes IR and UV spectral component effects to produce accurate color measurement
  • Enables accurate color and ambient light sensing under varying lighting conditions
  • Minimizes motion/transient errors
  • Clear channel provides a reference which allows for isolation of color content

Parts List

Name link
micro:bit Micro:bit Development Board
envirobit Pimoroni enviro:bit for BBC micro:bit

TCS3472 Code

You need to import the adafruit TCS34725 library – you can add this via the library manager

[codesyntax lang=”cpp”]

#include <Wire.h>
#include "Adafruit_TCS34725.h"
   
/* Initialise with default values (int time = 2.4ms, gain = 1x) */
// Adafruit_TCS34725 tcs = Adafruit_TCS34725();

/* Initialise with specific int time and gain values */
Adafruit_TCS34725 tcs = Adafruit_TCS34725(TCS34725_INTEGRATIONTIME_700MS, TCS34725_GAIN_1X);

void setup(void) {
  Serial.begin(9600);
  
  if (tcs.begin()) {
    Serial.println("Found sensor");
  } else {
    Serial.println("No TCS34725 found ... check your connections");
    while (1);
  }
  
  // Now we're ready to get readings!
}

void loop(void) {
  uint16_t r, g, b, c, colorTemp, lux;
  
  tcs.getRawData(&r, &g, &b, &c);
  colorTemp = tcs.calculateColorTemperature(r, g, b);
  lux = tcs.calculateLux(r, g, b);
  
  Serial.print("Color Temp: "); 
  Serial.print(colorTemp, DEC); 
  Serial.print(" K - ");
  Serial.print("Lux: "); 
  Serial.print(lux, DEC); 
  Serial.print(" - ");
  Serial.print("R: "); 
  Serial.print(r, DEC); 
  Serial.print(" ");
  Serial.print("G: "); 
  Serial.print(g, DEC);
  Serial.print(" ");
  Serial.print("B: "); 
  Serial.print(b, DEC); 
  Serial.print(" ");
  Serial.print("C: "); 
  Serial.print(c, DEC); 
  Serial.print(" ");
  Serial.println(" ");
}

[/codesyntax]

TCS3472 output

Open the serial monitor window and you will see something like this

Color Temp: 7173 K – Lux: 11 – R: 31 G: 26 B: 26 C: 39
Color Temp: 5645 K – Lux: 14 – R: 41 G: 32 B: 31 C: 53
Color Temp: 5153 K – Lux: 30 – R: 80 G: 63 B: 59 C: 103
Color Temp: 4887 K – Lux: 36 – R: 94 G: 74 B: 68 C: 133
Color Temp: 5310 K – Lux: 23 – R: 60 G: 48 B: 45 C: 93
Color Temp: 4981 K – Lux: 42 – R: 113 G: 88 B: 82 C: 167
Color Temp: 5565 K – Lux: 274 – R: 834 G: 633 B: 620 C: 974
Color Temp: 5653 K – Lux: 261 – R: 822 G: 618 B: 611 C: 937
Color Temp: 5295 K – Lux: 319 – R: 985 G: 738 B: 718 C: 1150
Color Temp: 5459 K – Lux: 103 – R: 306 G: 234 B: 227 C: 375
Color Temp: 4362 K – Lux: 87 – R: 245 G: 183 B: 167 C: 345
Color Temp: 3940 K – Lux: 25 – R: 88 G: 61 B: 57 C: 113

Arduino

enviro:bit BME280 and micro:bit Arduino code example

by shedboy71

Sense the world around you with enviro:bit! It’s loaded with sensors for air and weather, colour and light, and sound, and slots right onto your microbit.

Just slot in your micro:bit, then code enviro:bit with the block-based Microsoft MakeCode editor, or with MicroPython in the Mu code editor.

The sensors go hand-in-hand really well with the LED matrix on micro:bit, letting you graph sensors readings or have the LEDs react to sound, for example.

Features:

  • Comes fully-assembled and ready to use.
  • BME280 temperature, pressure, and humidity sensor.
  • TCS3472 light and colour sensor.
  • MEMS microphone.
  • Compatible with micro:bit.
  • Microsoft MakeCode and MicroPython support.
  • No soldering required!

Lets look at the BME280

The BME280 is an integrated environmental sensor developed specifically for mobile applications where size and low power consumption are key design constraints. The unit combines individual high linearity, high accuracy sensors for pressure, humidity and temperature in an 8-pin metal-lid 2.5 x 2.5 x 0.93 mm³ LGA package, designed for low current consumption (3.6 μA @1Hz), long term stability and high EMC robustness.

The humidity sensor features an extremely fast response time which supports performance requirements for emerging applications such as context awareness, and high accuracy over a wide temperature range. The pressure sensor is an absolute barometric pressure sensor with features exceptionally high accuracy and resolution at very low noise. The integrated temperature sensor has been optimized for very low noise and high resolution. It is primarily used for temperature compensation of the pressure and humidity sensors, and can also be used for estimating ambient temperature.

The BME280 supports a full suite of operating modes which provides the flexibility to optimize the device for power consumption, resolution and filter performance.

Parts List

Name link
micro:bit Micro:bit Development Board
envirobit Pimoroni enviro:bit for BBC micro:bit

BME280 Code

You need to import the BME280 and sensor librraies into the Arduino IDE. The BME280 sensor is set to 0x76 on the envirobit

[codesyntax lang=”cpp”]

#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

#define BME_SCK 13
#define BME_MISO 12
#define BME_MOSI 11
#define BME_CS 10

#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme; // I2C
//Adafruit_BME280 bme(BME_CS); // hardware SPI
//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI

unsigned long delayTime;

void setup() {
    Serial.begin(9600);
    Serial.println(F("BME280 test"));

    bool status;
    
    // default settings
    // (you can also pass in a Wire library object like &Wire2)
    status = bme.begin(0x76);  
    if (!status) {
        Serial.println("Could not find a valid BME280 sensor, check wiring!");
        while (1);
    }
    
    Serial.println("-- Default Test --");
    delayTime = 1000;

    Serial.println();
}


void loop() { 
    printValues();
    delay(delayTime);
}


void printValues() {
    Serial.print("Temperature = ");
    Serial.print(bme.readTemperature());
    Serial.println(" *C");

    Serial.print("Pressure = ");

    Serial.print(bme.readPressure() / 100.0F);
    Serial.println(" hPa");

    Serial.print("Approx. Altitude = ");
    Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
    Serial.println(" m");

    Serial.print("Humidity = ");
    Serial.print(bme.readHumidity());
    Serial.println(" %");

    Serial.println();
}

[/codesyntax]

BME280 output

Open the serial monitor window and you will see something like this

Temperature = 25.46 *C
Pressure = 972.81 hPa
Approx. Altitude = 342.30 m
Humidity = 42.62 %

Temperature = 25.45 *C
Pressure = 972.83 hPa
Approx. Altitude = 342.10 m
Humidity = 42.61 %

Temperature = 25.45 *C
Pressure = 972.76 hPa
Approx. Altitude = 342.22 m
Humidity = 42.62 %