mxchip iot devkit flashy LED examples

In this article we will look at easily flashing the RGB LED and the 3 individual LEDs of the mxchip iot devkit,

You can see these on the image of the board below. There are 3 LEDs for Wi-Fi, Azure and User and we will have a simple example to flash these on and off

mxchip

 

Parts

About $41 for the board

seeed studio MXChip AZ3166 IOT Developer Kit Compatible with Arduino

Code

This is for the Arduino IDE once you have added support for the MXChip

You could use the The RGB_LED class provides methods to set LED color and turn off LED but lets look at another way, each of the LEDs is defined and mapped in a file called PinNames.h which lies deep in your AZ3166 installation folder – here are the key parts

LED1 = MBED_GPIO_2,
LED2 = MBED_GPIO_9,
LED3 = MBED_GPIO_16,
LED_WIFI = LED1,
LED_AZURE = LED2,
LED_USER = LED3,
RGB_R = MBED_GPIO_31,
RGB_G = MBED_GPIO_27,
RGB_B = MBED_GPIO_12,

You can see that the RGB and 3 individual LEDs are clearly named and we can use these in our Arduino code.

Lets look at a couple of examples

First of all, the three individual LEDs, lets just switch these all on and off – a glorified blink sketch

[codesyntax lang=”cpp”]

void setup() 
{
  pinMode(LED_USER, OUTPUT);
  pinMode(LED_WIFI, OUTPUT);
  pinMode(LED_AZURE, OUTPUT);
}
 
void loop() 
{
  digitalWrite(LED_USER, HIGH);
  digitalWrite(LED_WIFI, HIGH);
  digitalWrite(LED_AZURE, HIGH);
  delay(500);
  digitalWrite(LED_USER, LOW);
  digitalWrite(LED_WIFI, LOW);
  digitalWrite(LED_AZURE, LOW);
  delay(500);
}

[/codesyntax]

Now lets move onto the RGB LED

[codesyntax lang=”cpp”]

 void setup() 
{
  // initialize the pins as digital output.
  pinMode(RGB_R, OUTPUT);
  pinMode(RGB_G, OUTPUT);
  pinMode(RGB_B, OUTPUT);
}
 
void loop() 
{
  //RGB is RED
  digitalWrite(RGB_R, HIGH);
  delay(1000);
  digitalWrite(RGB_R, LOW);
  delay(1000);
 
  // RGB is green
  digitalWrite(RGB_G, HIGH);
  delay(1000);
  digitalWrite(RGB_G, LOW);
  delay(1000);
 
  // RGB is blue
  digitalWrite(RGB_B, HIGH);
  delay(1000);
  digitalWrite(RGB_B, LOW);
  delay(1000);

  // you can mix leds 
  digitalWrite(RGB_R, HIGH);
  digitalWrite(RGB_B, HIGH);
  delay(1000);
  digitalWrite(RGB_R, LOW);
  digitalWrite(RGB_B, LOW);
  delay(1000);
  
  digitalWrite(RGB_R, HIGH);
  digitalWrite(RGB_G, HIGH);
  delay(1000);
  digitalWrite(RGB_R, LOW);
  digitalWrite(RGB_G, LOW);
  delay(1000);

}

[/codesyntax]

 

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