// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
+
+#include <Adafruit_GFX.h>
+#include <Adafruit_PCD8544.h>
+
+// pin 7 - Serial clock out (SCLK)
+// pin 6 - Serial data out (DIN)
+// pin 5 - Data/Command select (D/C)
+// pin 4 - LCD chip select (CS)
+// pin 3 - LCD reset (RST)
+Adafruit_PCD8544 display = Adafruit_PCD8544(7, 6, 5, 4, 3);
+
+#define Backlight_Pin 9
+
void setup()
{
Serial.begin(9600);
- Serial.println("DHT11 TEST PROGRAM ");
- Serial.print("LIBRARY VERSION: ");
+ Serial.println("DHT11 DS18B20 temperature");
+ Serial.print("DHT11 LIBRARY VERSION: ");
Serial.println(DHT11LIB_VERSION);
Serial.println();
+
+ // DS18B20
sensors.begin();
+
+ // Nokia 5110 display
+ display.begin();
+
+ // you can change the contrast around to adapt the display
+ // 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);
+ display.setCursor(0,0);
+ display.println("Ready");
+ display.display();
}
+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");
break;
}
+ dht11_humidity = (float)DHT11.humidity;
Serial.print("Humidity (%): ");
- Serial.println((float)DHT11.humidity, 2);
+ Serial.println(dht11_humidity, 2);
+ dht11_temperature = (float)DHT11.temperature;
Serial.print("Temperature (oC): ");
- Serial.println((float)DHT11.temperature, 2);
+ Serial.println(dht11_temperature, 2);
Serial.print("Temperature (oF): ");
Serial.println(Fahrenheit(DHT11.temperature), 2);
sensors.requestTemperatures(); // Send the command to get temperatures
Serial.print("Temperature for the device 1 (index 0) is: ");
- Serial.println(sensors.getTempCByIndex(0));
+ 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);
+ display.print("C ");
+ display.print(dht11_humidity, 0);
+ display.print("% ");
+ 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