L(dr) and P(ir) readings

[Arduino] / DHT11_DS18B20_temperature / DHT11_DS18B20_temperature.ino

diff --git a/DHT11_DS18B20_temperature/DHT11_DS18B20_temperature.ino b/DHT11_DS18B20_temperature/DHT11_DS18B20_temperature.ino
index 71073ae..c5fb8da 100644 (file)
--- a/DHT11_DS18B20_temperature/DHT11_DS18B20_temperature.ino
+++ b/DHT11_DS18B20_temperature/DHT11_DS18B20_temperature.ino
@@ -79,6 +79,7 @@ DallasTemperature sensors(&oneWire);
 // pin 3 - LCD reset (RST)
 Adafruit_PCD8544 display = Adafruit_PCD8544(7, 6, 5, 4, 3);
 
+#define Backlight_Pin 9
 
 void setup()
 {
@@ -98,6 +99,12 @@ void setup()
   // for the best viewing!
   display.setContrast(50);
 
+  pinMode(Backlight_Pin, OUTPUT);
+
+  pinMode(0, INPUT);
+  Serial.print("Backlight ");
+  Serial.println(analogRead(0));
+
   display.clearDisplay();
   display.setTextSize(1);
   display.setTextColor(BLACK);
@@ -110,6 +117,10 @@ float dht11_temperature = 0;
 float dht11_humidity = 0;
 float ds18b20_temperature = 0;
 
+#define TEMP_SIZE LCDWIDTH
+float temp[TEMP_SIZE] = {0.0};
+int temp_pos = 0; // position in circular buffer above
+
 void loop()
 {
   Serial.println("\n");
@@ -163,6 +174,8 @@ void loop()
   ds18b20_temperature = sensors.getTempCByIndex(0);
   Serial.println(ds18b20_temperature);  
 
+  temp[temp_pos] = ds18b20_temperature;
+
   display.clearDisplay();
   display.setCursor(0,0);
   display.print(dht11_temperature, 0);
@@ -172,9 +185,53 @@ void loop()
   display.print(ds18b20_temperature, 2);
   display.print("C");
 
+  float min = temp[0], max = temp[0];
+  
+  for(int i = 0; i < TEMP_SIZE; i++) {
+//    Serial.print(temp[i]);
+//    Serial.print(" ");
+    if (temp[i] < min && temp[i] > 0) min = temp[i];
+    if (temp[i] > max) max = temp[i];
+  }
+  Serial.println();
+  
+  Serial.print("temperature range ");
+  Serial.print(min);
+  Serial.print("-");
+  Serial.println(max);
+
+  // draw right to left so most recent value is on the right
+  for(int x = TEMP_SIZE - 1; x >= 0; x--) {
+    int pos = ( x + temp_pos + 1 ) % TEMP_SIZE;
+    if ( temp[pos] > 0 ) {
+      int y = ( ( temp[pos] - min ) / ( max - min ) ) * ( LCDHEIGHT - 10 );
+      display.drawLine(x, LCDHEIGHT - y, x, LCDHEIGHT, BLACK);
+//      display.drawPixel(x,y + 10, BLACK);
+//      Serial.print(temp[pos],2);
+//      Serial.print(" ");
+    }
+  }
+  Serial.println();
+
+  // refresh LCD
   display.display();
 
+  // pulse display backlight
+  int backlight = 0;
+
+  float old_temp = temp[(temp_pos + TEMP_SIZE - 1) % TEMP_SIZE];
+  if ( ds18b20_temperature < old_temp ) {
+    backlight = 32;
+  } else if ( ds18b20_temperature > old_temp ) {
+    backlight = 255;
+  }
+  analogWrite(Backlight_Pin, backlight);
+
   delay(2000);
+
+  // move slot in circular bugger
+  if ( ++temp_pos > TEMP_SIZE ) temp_pos = 0;
+
 }
 //
 // END OF FILE