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Drag Number

Let's draw a slider bar to control the 7-segment Display.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Raphael Kit	337	Raphael Kit

You can also buy them separately from the links below.

COMPONENT INTRODUCTION	PURCHASE LINK
GPIO Extension Board	BUY
Breadboard	BUY
Jumper Wires	BUY
Resistor	BUY
7-segment Display	BUY
74HC595	BUY

Wiring

Sketch

import processing.io.*;

int number = 0;
int levelRange=9;
Slider mySlider;

int SDI=17;   //serial data input
int RCLK=18;  //memory clock input(STCP)
int SRCLK =27;   //shift register clock input(SHCP)


int[] SegCode= {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void hc595_shift(int dat){
int i;

for(i=0;i<8;i++){
    int n=(0x80 & (dat << i));
    if ( n==0){
    GPIO.digitalWrite(SDI, 0);
    } else {
    GPIO.digitalWrite(SDI, 1);
    }
    GPIO.digitalWrite(SRCLK, 1);
    delay(1);
    GPIO.digitalWrite(SRCLK, 0);
}

    GPIO.digitalWrite(RCLK, 1);
    delay(1);
    GPIO.digitalWrite(RCLK, 0);
}

void setup() {
    size(400, 200);
    frameRate(50);
    mySlider = new Slider(width * 0.2,height * 0.4,width * 0.8,height * 0.6,0,levelRange,number);
    GPIO.pinMode(SDI, GPIO.OUTPUT);
    GPIO.pinMode(RCLK, GPIO.OUTPUT);
    GPIO.pinMode(SRCLK, GPIO.OUTPUT);

    GPIO.digitalWrite(SDI, 0);
    GPIO.digitalWrite(RCLK, 0);
    GPIO.digitalWrite(SRCLK, 0);
}

void draw() {

    background(255);
    mySlider.show();
    hc595_shift(SegCode[number]);
}

void mouseDragged(){
    number = mySlider.dragPoint(mouseX,mouseY);
}



class Slider{
    float slotPointAX;
    float slotPointBX;
    float slotPointAY;
    float slotPointBY;
    float linePoint;
    float depth;
    int maxRange;
    int minRange;
    int value;

    Slider(float ax, float ay, float bx, float by, int min, int max, int v){
        slotPointAX = ax;
        slotPointAY = ay;
        slotPointBX = bx;
        slotPointBY = by;
        maxRange = max;
        minRange = min;
        value = v;
        linePoint = slotPointAX;// + map(value, minRange, maxRange, slotPointAX, slotPointBX);
        depth = (slotPointBY - slotPointAY)*0.75;
    }

    void show(){
        rectMode(CORNERS);
        fill(200);
        stroke(255,0,0);
        rect(slotPointAX, slotPointAY, slotPointBX, slotPointBY);
        fill(255,0,0);
        rect(slotPointAX, slotPointAY, linePoint, slotPointBY);
        fill(200);
        textSize(depth);
        text(minRange, slotPointAX, slotPointBY+depth);
        text(maxRange, slotPointBX, slotPointBY+depth);
        text(value, linePoint, slotPointAY);
    }

    int dragPoint(float mx, float my){
        if(mx>=slotPointAX && mx<=slotPointBX && my>=slotPointAY && my<=slotPointBY){
            value = int(map(mx,slotPointAX,slotPointBX,minRange,maxRange));
            linePoint = map(value,minRange,maxRange,slotPointAX,slotPointBX);
        }
        return value;
    }
}

How it works?

This project integrates the Slider and 7-segment Display of the previous project. For specific knowledge points, please refer to Show Number and Metronome.