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LM35LCD update

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Johannes Findeisen 2015-08-17 04:14:57 +02:00
commit 8c032ca62e
1 changed files with 36 additions and 29 deletions
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65
LM35LCD/LM35LCD.ino
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@ -12,7 +12,7 @@ LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
// Define how many samples should be collected every $collectDelay miliseconds. // Define how many samples should be collected every $collectDelay miliseconds.
// After sample collection the temperature is beeing calculated and then // After sample collection the temperature is beeing calculated and then
// send to the LCD. // send to the LCD.
int samples = 30; int samples = 16;
// Collect delay between each sample. // Collect delay between each sample.
int collectDelay = 2000; int collectDelay = 2000;
@ -23,7 +23,7 @@ int ledPin = 13;
// The analog input pin where the LM35 is connected to. // The analog input pin where the LM35 is connected to.
int tempPin = 0; int tempPin = 0;
// Just some variable initializations // Just some variable initializations.
float tempC = 0; float tempC = 0;
float tempClast = 0; float tempClast = 0;
float tempF = 0; float tempF = 0;
@ -31,37 +31,21 @@ float tempF = 0;
void setup() { void setup() {
pinMode(ledPin, OUTPUT); pinMode(ledPin, OUTPUT);
lcd.begin(16, 2); lcd.begin(16, 2);
lcd.print("Temperature:"); // Get data for the first time.
lcd.setCursor(0, 1); // Read this to understand the temperature calculation:
// http://www.danielandrade.net/2008/07/05/temperature-sensor-arduino/
tempC = (5.0 * analogRead(tempPin) * 100.0) / 1024.0; tempC = (5.0 * analogRead(tempPin) * 100.0) / 1024.0;
tempClast = tempC;
// Celsius to Fahrenheit conversion
tempF = (tempC * 9) / 5 + 32; tempF = (tempC * 9) / 5 + 32;
lcd_print(); // Refresh the LCD output
} lcd_refresh();
// Prints results to the display
void lcd_print() {
lcd.setCursor(0, 1);
lcd.print(tempC);
lcd.print((char)223);
lcd.print("C/");
lcd.print(tempF);
lcd.print((char)223);
lcd.print("F");
if(tempClast > tempC) {
lcd.print("-");
} else if(tempClast < tempC) {
lcd.print("+");
} else {
lcd.print("*");
}
} }
void loop() { void loop() {
int i; int i;
tempC = 0; tempC = 0;
for(i = 0; i <= (samples - 1); i++) { for(i = 0; i <= (samples - 1); i++) {
// Read this to understand the temperature calculation:
// http://www.danielandrade.net/2008/07/05/temperature-sensor-arduino/
tempC = tempC + ((5.0 * analogRead(tempPin) * 100.0) / 1024.0); tempC = tempC + ((5.0 * analogRead(tempPin) * 100.0) / 1024.0);
digitalWrite(ledPin, HIGH); digitalWrite(ledPin, HIGH);
delay((collectDelay / 2)); delay((collectDelay / 2));
@ -70,10 +54,33 @@ void loop() {
} }
// Calculate temperature // Calculate temperature
tempC = tempC / (float)samples; tempC = tempC / (float)samples;
// Celsius to Fahrenheit cobversation // Celsius to Fahrenheit conversion.
tempF = (tempC * 9) / 5 + 32; tempF = (tempC * 9) / 5 + 32;
// Print result to the display // Print results to the display.
lcd_print(); lcd_refresh();
// Remember current temperature for next run // Remember current temperature for next run.
tempClast = tempC; tempClast = tempC;
} }
// Prints results to the display
void lcd_refresh() {
lcd.setCursor(0, 0);
lcd.print("Temperature");
lcd.print((char)40); // ASCII code 40 = "("
if(tempClast > tempC) {
lcd.print((char)60); // ASCII code 60 = "<"
} else if(tempClast < tempC) {
lcd.print((char)62); // ASCII code 61 = ">"
} else {
lcd.print((char)61); // ASCII code 61 = "="
}
lcd.print((char)41); // ASCII code 41 = ")"
lcd.print((char)58); // ASCII code 58 = ":"
lcd.setCursor(0, 1);
lcd.print(tempC);
lcd.print((char)223); // ASCII code 223 = "°"
lcd.print("C/");
lcd.print(tempF);
lcd.print((char)223); // ASCII code 223 = "°"
lcd.print("F");
}