initial implementation of lcd display code

wvuong · Jun 26, 2012 · 39b1284 · 39b1284
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diff --git a/Autoscroll/Autoscroll.ino b/Autoscroll/Autoscroll.ino
@@ -0,0 +1,79 @@
+/*
+  LiquidCrystal Library - Autoscroll
+ 
+ Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
+ library works with all LCD displays that are compatible with the 
+ Hitachi HD44780 driver. There are many of them out there, and you
+ can usually tell them by the 16-pin interface.
+ 
+ This sketch demonstrates the use of the autoscroll()
+ and noAutoscroll() functions to make new text scroll or not.
+ 
+ The circuit:
+ * LCD RS pin to digital pin 12
+ * LCD Enable pin to digital pin 11
+ * LCD D4 pin to digital pin 5
+ * LCD D5 pin to digital pin 4
+ * LCD D6 pin to digital pin 3
+ * LCD D7 pin to digital pin 2
+ * LCD R/W pin to ground
+ * 10K resistor:
+ * ends to +5V and ground
+ * wiper to LCD VO pin (pin 3)
+ 
+ Library originally added 18 Apr 2008
+ by David A. Mellis
+ library modified 5 Jul 2009
+ by Limor Fried (http://www.ladyada.net)
+ example added 9 Jul 2009
+ by Tom Igoe 
+ modified 22 Nov 2010
+ by Tom Igoe
+ 
+ This example code is in the public domain.
+
+ http://arduino.cc/en/Tutorial/LiquidCrystalAutoscroll
+
+ */
+
+// include the library code:
+#include <LiquidCrystal.h>
+
+// initialize the library with the numbers of the interface pins
+LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+int backLight = 13;    // pin 13 will control the backlight
+
+void setup() {
+  // set up backlight
+  pinMode(backLight, OUTPUT);
+  digitalWrite(backLight, HIGH); // turn backlight on. Replace 'HIGH' with 'LOW' to turn it off.
+
+  // set up the LCD's number of columns and rows: 
+  lcd.begin(16,2);
+}
+
+void loop() {
+  // set the cursor to (0,0):
+  lcd.setCursor(0, 0);
+  // print from 0 to 9:
+  for (int thisChar = 0; thisChar < 10; thisChar++) {
+   lcd.print(thisChar);
+   delay(500);
+  }
+
+  // set the cursor to (16,1):
+  lcd.setCursor(16,1);
+  // set the display to automatically scroll:
+  lcd.autoscroll();
+  // print from 0 to 9:
+  for (int thisChar = 0; thisChar < 10; thisChar++) {
+    lcd.print(thisChar);
+    delay(500);
+  }
+  // turn off automatic scrolling
+  lcd.noAutoscroll();
+
+  // clear screen for the next loop:
+  lcd.clear();
+}
+
diff --git a/bbqsmoker.ino b/bbqsmoker.ino
@@ -1,32 +1,29 @@
 /*
-  Analog input, analog output, serial output
- 
- Reads an analog input pin, maps the result to a range from 0 to 255
- and uses the result to set the pulsewidth modulation (PWM) of an output pin.
- Also prints the results to the serial monitor.
- 
- The circuit:
- * potentiometer connected to analog pin 0.
-   Center pin of the potentiometer goes to the analog pin.
-   side pins of the potentiometer go to +5V and ground
- * LED connected from digital pin 9 to ground
- 
- created 29 Dec. 2008
- modified 9 Apr 2012
- by Tom Igoe
- 
- This example code is in the public domain.
+ Based on the "Analog input, analog output, serial output" example sketch.
  
+ This program reads from Maverick probes via analog A0 pin and writes the observed temperature
+ value to the LCD.
  */
 
+// include the library code:
+#include <LiquidCrystal.h>
+LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+int backLight = 13;    // pin 13 will control the backlight
+
 // These constants won't change.  They're used to give names
 // to the pins used:
-const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to
+const int analogInPin = A0;  // Analog input pin that the probe is attached to
 
 int sensorValue = 0;        // value read from the pot
 int outputValue = 0;        // value output to the PWM (analog out)
+String stringValue = "";
 
 void setup() {
+  // set up backlight
+  pinMode(backLight, OUTPUT);
+  digitalWrite(backLight, HIGH); // turn backlight on. Replace 'HIGH' with 'LOW' to turn it off.
+  lcd.begin(16,2);
+
   // initialize serial communications at 9600 bps:
   Serial.begin(9600); 
 }
@@ -44,6 +41,21 @@ void loop() {
   Serial.print("\t output = ");      
   Serial.println(outputValue);   
 
+  if (sensorValue == 0 || sensorValue == 1023) {
+    stringValue = "No signal";
+  }
+  else {
+    stringValue = outputValue + "°";
+  }
+
+  lcd.clear();                  // start with a blank screen
+  lcd.setCursor(0,0);           // set cursor to column 0, row 0 (the first row)
+  lcd.print("Current temp:");    // change this text to whatever you like. keep it clean.
+  lcd.setCursor(0,1);           // set cursor to column 0, row 1
+  lcd.print(stringValue);
+  lcd.noAutoscroll();
+
+
   // wait 2 milliseconds before the next loop
   // for the analog-to-digital converter to settle
   // after the last reading:
@@ -70,4 +82,4 @@ int thermister_temp(int aval) {
 	T = (1 / ((2.3067434E-4) + (2.3696596E-4) * R + (1.2636414E-7) * R * R * R)) - 273.25;
 	// return degrees F
 	return ((int) ((T * 9.0) / 5.0 + 32.0));
-}
+}