Hello!
I am fairly new to arduino and I am trying to display a number from a temperature sensor on my 7 segment display, but having difficulty with seperating the numbers.
My thought is that you can split, for example, 24,48 into A=2, B=4, C= 4, D = 8 and then take the value on A to the first digit on the display, B on second and so on.
Is this possible or is there any better solution for this??
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int pinA = 2;
int pinB = 3;
int pinC = 4;
int pinD = 5;
int pinE = 6;
int pinF = 7;
int pinG = 8;
int pinH = 13;
int D1 = 9;
int D2 = 10;
int D3 = 11;
int D4 = 12;
float a;
float b;
float c;
float d;
int tempSensor = A0; //temperature sensor with float to get the decimals
float temperatureC; //float value to hold the temperature
float convertCelsius;
void setup() {
pinMode(pinA, OUTPUT);
pinMode(pinB, OUTPUT);
pinMode(pinC, OUTPUT);
pinMode(pinD, OUTPUT);
pinMode(pinE, OUTPUT);
pinMode(pinF, OUTPUT);
pinMode(pinG, OUTPUT);
pinMode(pinH, OUTPUT);
pinMode(D1, OUTPUT);
pinMode(D2, OUTPUT);
pinMode(D3, OUTPUT);
pinMode(D4, OUTPUT);
pinMode(tempSensor, INPUT);
Serial.begin(9600); //serialcommunication at 9600 bits/second
}
void loop() {
convertCelsius = analogRead(tempSensor);
temperatureC = (5 * convertCelsius * 100) / 1024;
Serial.println(temperatureC); //print the current temperature
temperatureC = (a, b, c, d) // for example: temperature = 24,38 then (2,4,3,8), [b]this is where i am having trouble[/b]
}
//I need to create three more copies of the below but with b,c and finally d.
if (a == 0)
{
digitalWrite(D1, LOW);
digitalWrite(D2, HIGH);
digitalWrite(D3, HIGH);
digitalWrite(D4, HIGH);
digitalWrite(pinA, HIGH);
digitalWrite(pinB, HIGH);
digitalWrite(pinC, HIGH);
digitalWrite(pinD, HIGH);
digitalWrite(pinE, HIGH);
digitalWrite(pinF, HIGH);
digitalWrite(pinG, LOW);
digitalWrite(pinH, LOW);
delay(10);
}
if (a == 1)
{
digitalWrite(D1, LOW);
digitalWrite(D2, HIGH);
digitalWrite(D3, HIGH);
digitalWrite(D4, HIGH);
digitalWrite(pinA, LOW);
digitalWrite(pinB, HIGH);
digitalWrite(pinC, HIGH);
digitalWrite(pinD, LOW);
digitalWrite(pinE, LOW);
digitalWrite(pinF, LOW);
digitalWrite(pinG, LOW);
digitalWrite(pinH, LOW);
delay(10);
}
if (a == 2)
{
digitalWrite(D1, LOW);
digitalWrite(D2, HIGH);
digitalWrite(D3, HIGH);
digitalWrite(D4, HIGH);
digitalWrite(pinA, HIGH);
digitalWrite(pinB, HIGH);
digitalWrite(pinC, LOW);
digitalWrite(pinD, HIGH);
digitalWrite(pinE, HIGH);
digitalWrite(pinF, LOW);
digitalWrite(pinG, HIGH);
digitalWrite(pinH, LOW);
delay(10);
}
if (a == 3)
{
digitalWrite(D1, LOW);
digitalWrite(D2, HIGH);
digitalWrite(D3, HIGH);
digitalWrite(D4, HIGH);
digitalWrite(pinA, HIGH);
digitalWrite(pinB, HIGH);
digitalWrite(pinC, HIGH);
digitalWrite(pinD, HIGH);
digitalWrite(pinE, LOW);
digitalWrite(pinF, LOW);
digitalWrite(pinG, HIGH);
digitalWrite(pinH, LOW);
delay(10);
}
if (a == 4)
{
digitalWrite(D1, LOW);
digitalWrite(D2, HIGH);
digitalWrite(D3, HIGH);
digitalWrite(D4, HIGH);
digitalWrite(pinA, LOW);
digitalWrite(pinB, HIGH);
digitalWrite(pinC, HIGH);
digitalWrite(pinD, LOW);
digitalWrite(pinE, LOW);
digitalWrite(pinF, HIGH);
digitalWrite(pinG, HIGH);
digitalWrite(pinH, LOW);
delay(10);
}
if (a == 5)
{
digitalWrite(D1, LOW);
digitalWrite(D2, HIGH);
digitalWrite(D3, HIGH);
digitalWrite(D4, HIGH);
digitalWrite(pinA, HIGH);
digitalWrite(pinB, LOW);
digitalWrite(pinC, HIGH);
digitalWrite(pinD, HIGH);
digitalWrite(pinE, LOW);
digitalWrite(pinF, HIGH);
digitalWrite(pinG, HIGH);
digitalWrite(pinH, LOW);
delay(10);
}
if (a == 6)
{
digitalWrite(D1, LOW);
digitalWrite(D2, HIGH);
digitalWrite(D3, HIGH);
digitalWrite(D4, HIGH);
digitalWrite(pinA, HIGH);
digitalWrite(pinB, LOW);
digitalWrite(pinC, HIGH);
digitalWrite(pinD, HIGH);
digitalWrite(pinE, HIGH);
digitalWrite(pinF, HIGH);
digitalWrite(pinG, HIGH);
digitalWrite(pinH, LOW);
delay(10);
}
if (a == 7)
{
digitalWrite(D1, LOW);
digitalWrite(D2, HIGH);
digitalWrite(D3, HIGH);
digitalWrite(D4, HIGH);
digitalWrite(pinA, HIGH);
digitalWrite(pinB, HIGH);
digitalWrite(pinC, HIGH);
digitalWrite(pinD, LOW);
digitalWrite(pinE, LOW);
digitalWrite(pinF, LOW);
digitalWrite(pinG, LOW);
digitalWrite(pinH, LOW);
delay(10);
}
if (a == 8)
{
digitalWrite(D1, LOW);
digitalWrite(D2, HIGH);
digitalWrite(D3, HIGH);
digitalWrite(D4, HIGH);
digitalWrite(pinA, HIGH);
digitalWrite(pinB, HIGH);
digitalWrite(pinC, HIGH);
digitalWrite(pinD, HIGH);
digitalWrite(pinE, HIGH);
digitalWrite(pinF, HIGH);
digitalWrite(pinG, HIGH);
digitalWrite(pinH, LOW);
delay(10);
}
if (a == 9)
{
digitalWrite(D1, LOW);
digitalWrite(D2, HIGH);
digitalWrite(D3, HIGH);
digitalWrite(D4, HIGH);
digitalWrite(pinA, HIGH);
digitalWrite(pinB, HIGH);
digitalWrite(pinC, HIGH);
digitalWrite(pinD, HIGH);
digitalWrite(pinE, LOW);
digitalWrite(pinF, HIGH);
digitalWrite(pinG, HIGH);
digitalWrite(pinH, LOW);
delay(10);
}
}
Yes you definitely need some series resistors. Just type in "LED calculator" in Google and you will find some. Get your datasheet handy. Once you have it, here is one such calculator you can use:
http://centipedestudio.com/calculator_led.php
If you have no idea where the datasheet is, could you provide the color? Or the part number on the display? If nothing, then start with a 1k resistor (or a little lower) just to get something visible, get your logic working with some code someone else posted, and work on the brightness later.
