From 5d7380fddcb7eead72fc60330f85d87e8db4f4f5 Mon Sep 17 00:00:00 2001
From: Johannes Findeisen <you@hanez.org>
Date: Mon, 24 Aug 2015 17:11:46 +0200
Subject: [PATCH] added LM35LCDI2C where the arduino interfaces to the LCD via
 an I2C breakoutboard

---
 LM35LCDI2C/LM35LCDI2C.ino | 92 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 LM35LCDI2C/LM35LCDI2C.ino

diff --git a/LM35LCDI2C/LM35LCDI2C.ino b/LM35LCDI2C/LM35LCDI2C.ino
new file mode 100644
index 0000000..cbc222b
--- /dev/null
+++ b/LM35LCDI2C/LM35LCDI2C.ino
@@ -0,0 +1,92 @@
+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+
+LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 20 chars and 4 line display
+
+// Define how many samples should be collected every $collectDelay miliseconds.
+// After sample collection the temperature is beeing calculated and then
+// send to the LCD.
+int samples = 16;
+
+// Collect delay between each sample.
+int collectDelay = 2000;
+
+// The pin where the status LED is connected to.
+int ledPin = 13;
+
+// The analog input pin where the LM35 is connected to.
+int tempPin = 0;
+
+// Just some variable initializations.
+float tempC = 0;
+float tempClast = 0;
+float tempF = 0;
+
+void setup()
+{
+  /*lcd.init();
+  lcd.autoscroll();
+  lcd.setCursor(2, 0);
+  lcd.backlight();
+  lcd.print("Hello, world! asd as d as d asd");
+  lcd.setCursor(0, 1);
+  lcd.print("Hello, world2");
+  */
+  pinMode(ledPin, OUTPUT);
+  lcd.init();
+  lcd.backlight();
+
+  // Get data for the first time.
+  // 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;
+  tempClast = tempC;
+  // Celsius to Fahrenheit conversion
+  tempF = (tempC * 9) / 5 + 32;
+  // Refresh the LCD output
+  lcd_refresh();
+}
+
+void loop()
+{
+  int i;
+  tempC = 0;
+  for (i = 0; i <= (samples - 1); i++) {
+    tempC = tempC + ((5.0 * analogRead(tempPin) * 100.0) / 1024.0);
+    digitalWrite(ledPin, HIGH);
+    delay((collectDelay / 2));
+    digitalWrite(ledPin, LOW);
+    delay((collectDelay / 2));
+  }
+  // Calculate temperature
+  tempC = tempC / (float)samples;
+  // Celsius to Fahrenheit conversion.
+  tempF = (tempC * 9) / 5 + 32;
+  // Print results to the display.
+  lcd_refresh();
+  // Remember current temperature for next run.
+  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 62 = ">"
+  } 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");
+}