Arduino for BPI:bit 16: keys with LED matrix learning

Webduino & Arduino STEAM education Arduino
1

Learn how to use the buttons on bpibit with LED panel ,The following example USES the NeoPixelBus library, so you need to download it from the Arduino library management

test with BPI:bit + Arduino IDE 1.8.9

about WS2812b LED

main function:

RgbColor(uint8_t r, uint8_t g, uint8_t b) : R(r), G(g), B(b) { };

void SetPixelColor(uint16_t indexPixel, typename T_COLOR_FEATURE::ColorObject color)

Parameter function
indexPixel Labels of LED panels (see resources for labels below))
color Custom colors

Code interpretation

NeoPixelBus<NeoGrbFeature, Neo800KbpsMethod> strip(PixelCount, PixelPin)Configure the NeoPixelBus object

sample code

#include <NeoPixelBus.h>

const uint16_t PixelCount = 25;
const uint8_t PixelPin = 4;

#define colorSaturation 128
#define delay_ms 500

NeoPixelBus<NeoGrbFeature, Neo800KbpsMethod> strip(PixelCount, PixelPin);

RgbColor red(colorSaturation, 0, 0);
RgbColor green(0, colorSaturation, 0);
RgbColor blue(0, 0, colorSaturation);
RgbColor white(colorSaturation);
RgbColor black(0);
RgbColor num1(0.8 * colorSaturation, 0, 0.2 * colorSaturation);
RgbColor num2(0.5 * colorSaturation, 0, 0.5 * colorSaturation);
RgbColor num3(0.25 * colorSaturation, 0, 0.75 * colorSaturation);

#define ledPower 2 //It's very important for the v1.2, if you use the v1.4 ,you can delete it
// #define BottomA 35
// #define BottomB 27

void setup()
{
    Serial.begin(115200); //Serial Port Config 115200-8-N-1
    //while (!Serial); // wait for serial attach

    Serial.println();
    Serial.println("Initializing...");
    Serial.flush();

    // this resets all the neopixels to an off state
    strip.Begin();
    strip.Show();

    //You can also use BUTTON_A / BUTTON_B
    pinMode(BUTTON_A, INPUT);//Botton A Pin Mode :Digital Input 
    pinMode(BUTTON_B, INPUT);//Botton B Pin Mode :Digital Input
    
    //It's very important for the v1.2, if you use the v1.4 ,you can delete it
    pinMode(ledPower,OUTPUT);
    digitalWrite(ledPower, HIGH); 
}

void loop()
{
    if (digitalRead(BUTTON_A) == LOW)
    {
        delay(10);
        if (digitalRead(BUTTON_A) == LOW)
        {
             strip.SetPixelColor( 6, num1);
             strip.SetPixelColor( 7, num1);
             strip.SetPixelColor( 8, num1);
             strip.SetPixelColor( 9, num1);
             strip.SetPixelColor(10, num1);
             strip.SetPixelColor(13, num1);
             strip.SetPixelColor(16, num1);
             strip.SetPixelColor(17, num1);
             strip.SetPixelColor(18, num1);
             strip.SetPixelColor(19, num1);
            strip.Show();
        }
        else
        {
        int i;
        Serial.println("Turn Off");
            for (i = 0; i <= PixelCount - 1; i++)
            {
            strip.SetPixelColor(i, black);
            strip.Show();
            }
        }
    }


     if (digitalRead(BUTTON_B) == LOW)
    {
        delay(10);
        if (digitalRead(BUTTON_B) == LOW)
        {
            //strip.SetPixelColor( 5, num2);
            strip.SetPixelColor( 6, num2);
            strip.SetPixelColor( 7, num2);
            strip.SetPixelColor( 8, num2);
            strip.SetPixelColor( 9, num2);
            strip.SetPixelColor(10, num2);
            strip.SetPixelColor(12, num2);
            strip.SetPixelColor(14, num2);
            strip.SetPixelColor(15, num2);
            strip.SetPixelColor(16, num2);
            strip.SetPixelColor(17, num2);
            strip.SetPixelColor(18, num2);
            strip.SetPixelColor(19, num2);
            strip.Show();
        }
        else
        {
        int i;
        Serial.println("Turn Off");
            for (i = 0; i <= PixelCount - 1; i++)
            {
            strip.SetPixelColor(i, black);
            strip.Show();
            }
        }
    }
}

Run

Press button A, LED panel displays letter A; Press button B and the LED panel displays the letter B

BPI-STEAM

NeoPixelBus lib(github)

Note

  1. On the Arduino IDE, select bpi-bit for the development board