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This is an adaptation of the ReadAnalogVoltage tutorial. The idea is to map the analogue input voltage and display that mapped value on a 7 segment display via a shiftbit register.
/*
********************************************************************
Name : shiftOutAnalogueDisplay, Test code
Author : Benjo Charlie
Date : 13 Sept, 2013
Version : 1.0
Notes : This is an adaptation of the ReadAnalogVoltage tutorial.
:
: The idea is to map the analogue input voltage and display that
: mapped value on a 7 segment display via a shiftbit register.
********************************************************************
7 Segment (Common Anode) Display Map: (This can be altered to reflect your HW)
D E 5V F G
___|___|___|___|___|____
| |
| F |
| E G |
| D |
| A C |
| B H(Dot) |
|________________________|
| | | | |
A B 5V C H
74HC595 Map:
_______
Q1 |1 * 16| Vcc PINS 1-7, 15 Q0 - Q7 Output Pins
Q2 |2 15| Q0 PIN 8 GND Ground, Vss
Q3 |3 14| DS PIN 9 Q7" Serial Out
Q4 |4 13| OE PIN 10 MR Master Reclear, active low
Q5 |5 12| ST_CP PIN 11 SH_CP Shift register clock pin
Q6 |6 11| SH_CP PIN 12 ST_CP Storage register clock pin (latch pin)
Q7 |7 10| MR PIN 13 OE Output enable, active low
GND |8_____9| Q7" PIN 14 DS Serial data input
PIN 16 Vcc Positive supply voltage
_______
LED Q1-|1 * 16|-5V
LED Q2-|2 15|-LED Q0
LED Q3-|3 14|-PIN 11
LED Q4-|4 13|-GND
LED Q5-|5 12|-PIN 8
LED Q6-|6 11|-PIN 12 ; 1uF TO GND
DOT Q7-|7 10|-5V
GND-|8_____9|-NILL
*/
int latchPin = 8; //Pin connected to ST_CP of 74HC595
int clockPin = 12; //Pin connected to SH_CP of 74HC595
int dataPin = 11; //Pin connected to DS of 74HC595
byte SegDisplay;
int sensorPin=A0;
// Setup the combination to display each number on the display
byte ZERO = ; // A number value goes here.
byte ONE = ;
byte TWO = ;
byte THREE = ;
byte FOUR = ;
byte FIVE = ;
byte SIX = ;
byte SEVEN = ;
byte EIGHT = ;
byte NINE = ;
byte MAX = ;
void setup() {
pinMode(8, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
Serial.begin(9600);
}
void loop() {
int analogueValue = analogRead(sensorPin);
analogueValue = map(analogueValue, 0, 1023, 0, 10);
digitalWrite(latchPin, LOW);
if (analogueValue==0) SegDisplay=ZERO; // Min value
if (analogueValue==1) SegDisplay=ONE;
if (analogueValue==2) SegDisplay=TWO;
if (analogueValue==3) SegDisplay=THREE;
if (analogueValue==4) SegDisplay=FOUR;
if (analogueValue==5) SegDisplay=FIVE;
if (analogueValue==6) SegDisplay=SIX;
if (analogueValue==7) SegDisplay=SEVEN;
if (analogueValue==8) SegDisplay=EIGHT;
if (analogueValue==9) SegDisplay=NINE;
if (analogueValue>9) SegDisplay=MAX; // Max Value: illuminate Dot
shiftOut(dataPin, clockPin, MSBFIRST, SegDisplay);
digitalWrite(latchPin, HIGH); //take the latch pin high so the LEDs will light up:
// Print out the corresponding Shift Bit Register pin with it's value.
Serial.print("analogueValue = ");
Serial.println(analogueValue);
Serial.print("SegDisplay = ");
Serial.println(SegDisplay, BIN);
delay(100); // Allow to settle
}
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