A look at the Arduino Multi-purpose Shield V2

OK, for the next arduino shield in the collection we look at the Multi-purpose Shield V2 from keyes, its not as advanced and feature rich as the v1.

The shield looks like this

Here are some of the features of the shield

6 LEDs which use pins D8 to D13
3 buttons which use A1, A2 and A3
Potentiometer for analog input connected to A0
Piezo buzzer connected to D3
4 digit display controlled by 2 74hc595’s

Pins A4,A5, D6 and D7 are available via a connector which means you can connect I2C devices to the shield and in the case of temperature sensors display the results on the display

I also think that there are too many LEDs on the board, 4 would have been more than enough instead of the 6 and a couple of other components could have been added

Parts List

The shield costs $8

Code Example

This is the default code example which shows various functionality

No buttons pressed – pot value is displayed on display
Button 1 pressed – value is displayed on 7 segment displays
Button 2 pressed – buzzer beeps
Button 3 pressed – leds light

[codesyntax lang=”cpp”]

//pressing nothing to display value of analog revolving potentiometer
//pressing key1 to show 0-3 on LED Segment Displays
//pressing key2 and buzzer ringing
//pressing key3 and flowing light on

//defining three pins of 74HC595
int latchPin = 4;//ST_CP
int clockPin = 5;//SH_CP 
int dataPin = 2; //DS 

//defining three key input
int key1 = A1;
int key2 = A2;
int key3 = A3;

//buzzer pin
int buzzer = 3;

//pin definition of flowing light
int led1 = 13;
int led2 = 12;
int led3 = 11;
int led4 = 10;
int led5 = 9;
int led6 = 8;


int dat_wei[4]={0x01,0x02,0x04,0x08};    //LED Segment Displays
//showing 1--4
int dat_duan[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //LED Segment Displays showing 0--9
char i=0; 
void setup ()
{
  pinMode(latchPin,OUTPUT);
  pinMode(clockPin,OUTPUT);
  pinMode(dataPin,OUTPUT); 

  pinMode(key1,INPUT); 
  pinMode(key2,INPUT); 
  pinMode(key3,INPUT); 

  pinMode(buzzer,OUTPUT);

  pinMode(led1,OUTPUT);
  pinMode(led2,OUTPUT);
  pinMode(led3,OUTPUT); 
  pinMode(led4,OUTPUT);
  pinMode(led5,OUTPUT);
  pinMode(led6,OUTPUT); 
  for(char i=8;i<14;i++)
   digitalWrite(i,HIGH);    
}

void loop()
{
if(digitalRead(key1)==LOW )
  SMG();                    //testing LED Segment Displays
if(digitalRead(key2)==LOW )
  buzzer_();                //testing buzzer
if(digitalRead(key3)==LOW)
  led_display();            //testing LED
if(digitalRead(key1)==HIGH & digitalRead(key2)==HIGH & digitalRead(key3)==HIGH)  
  analog();                //testing analog input
}

void SMG(void)
{
 digitalWrite(latchPin,LOW);                         //clear LED Segment Displays
 shiftOut(dataPin, clockPin, MSBFIRST ,0x00);
 shiftOut(dataPin, clockPin, MSBFIRST ,0x00);
 digitalWrite(latchPin,HIGH);

while(1)
 {
 digitalWrite(latchPin,LOW);
 shiftOut(dataPin, clockPin, MSBFIRST ,dat_duan[i]);   //data about second piece     
 shiftOut(dataPin, clockPin, MSBFIRST ,dat_wei[i]);    //way of MSBFIRST,data about first piece
 digitalWrite(latchPin,HIGH);
 i++;
 if(i==4){i=0;}
 if(digitalRead(key1)==HIGH)
 {
   digitalWrite(latchPin,LOW);                         //clear LED Segment Displays
   shiftOut(dataPin, clockPin, MSBFIRST ,0x00);
   shiftOut(dataPin, clockPin, MSBFIRST ,0x00);
   digitalWrite(latchPin,HIGH);
   break;
 }
 }
}

void buzzer_(void)
{
 char i;

 digitalWrite(latchPin,LOW);                         //clear LED Segment Displays
 shiftOut(dataPin, clockPin, MSBFIRST ,0x00);
 shiftOut(dataPin, clockPin, MSBFIRST ,0x00);
 digitalWrite(latchPin,HIGH);

 while(1)
 {
 for(i=0;i<80;i++)// output a frequency sound
 { 
  digitalWrite(buzzer,LOW);// sound
  delay(1);//delay1ms 
  digitalWrite(buzzer,HIGH);//not sound
  delay(1);//ms delay 
 } 
 for(i=0;i<100;i++)// output a frequency sound
 { 
  digitalWrite(buzzer,LOW);// sound
  digitalWrite(buzzer,HIGH);//not sound
  delay(2);//2ms delay 
 }
 if(digitalRead(key2)==HIGH)
 {
   digitalWrite(latchPin,LOW);                         //clear LED Segment Displays
   shiftOut(dataPin, clockPin, MSBFIRST ,0x00);
   shiftOut(dataPin, clockPin, MSBFIRST ,0x00);
   digitalWrite(latchPin,HIGH);
   break;
 }
 }
}

void led_display()
{
digitalWrite(latchPin,LOW);                         //clear LED Segment Displays
shiftOut(dataPin, clockPin, MSBFIRST ,0x00);
shiftOut(dataPin, clockPin, MSBFIRST ,0x00);
digitalWrite(latchPin,HIGH);

while(1)
{
 digitalWrite(led1,LOW);
 delay(100);
 digitalWrite(led1,HIGH);
 digitalWrite(led2,LOW);
 delay(100);
 digitalWrite(led2,HIGH);
 digitalWrite(led3,LOW);
 delay(100);
 digitalWrite(led3,HIGH);
 digitalWrite(led4,LOW);
 delay(100);
 digitalWrite(led4,HIGH);
 digitalWrite(led5,LOW);
 delay(100);
 digitalWrite(led5,HIGH);
 digitalWrite(led6,LOW);
 delay(100);
 digitalWrite(led6,HIGH);
 if(digitalRead(key3)==HIGH)
 {
   break;
 }
}
}


void analog()
{
int val,qian,bai,shi,ge;
val=analogRead(A0);
qian=val/1000;
bai=val%1000;
bai=bai/100;
shi=val%100;
shi=shi/10;
ge=val%10;
digitalWrite(latchPin,LOW);
shiftOut(dataPin, clockPin, MSBFIRST ,dat_duan[qian]);
shiftOut(dataPin, clockPin, MSBFIRST ,0x01);
digitalWrite(latchPin,HIGH);
digitalWrite(latchPin,LOW);
shiftOut(dataPin, clockPin, MSBFIRST ,dat_duan[bai]);
shiftOut(dataPin, clockPin, MSBFIRST ,0x02);
digitalWrite(latchPin,HIGH);
digitalWrite(latchPin,LOW);
shiftOut(dataPin, clockPin, MSBFIRST ,dat_duan[shi]);
shiftOut(dataPin, clockPin, MSBFIRST ,0x04);
digitalWrite(latchPin,HIGH);
digitalWrite(latchPin,LOW);
shiftOut(dataPin, clockPin, MSBFIRST ,dat_duan[ge]);
shiftOut(dataPin, clockPin, MSBFIRST ,0x08);
digitalWrite(latchPin,HIGH);
}

[/codesyntax]