week 10. Input devices

This Week i used the read data from the DHT22 Temperature and Humidity Sensor of last week Assignment and displayed them on a I2C display on the Board i designed in week 6 and produced in Week 8. I programmed the board with the Arduino IDE shown

In our group assignment, We showed, how we measured the powerdraw inside an project. I was responsible for the Pictures and the Website.

Prepwork

board setup

First i have to setted up the Pi Pico 2 W as Borad. For that i used the RP2040 BoardLibrary from "Earle F. Philhower, III". Step 1 was to open the preferences and add "https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json" to "Additional boards manager URLs"

Second steo was to install the Boards in the Boards Manager.

libraries

To make the code work with I2C1(second I2C-channel of the Pi Pico 2 W), I needed to change a library. As in Week 4 i used the LiquidCrystal I2C libray by Frank de Brabander. I changed all occurrences of "Wire" with "Wire1" in the LiquidCrystal_I2C.h and LiquidCrystal_I2C.cpp in the libraries folder. That means that i now uses the second i2c channel instead of the first, that also means that for futur projects i need to change it back in .cpp and .h file

connnecting the display and sensor

To Connect our Sensor, use the second GP-Pin, which is "DHT-DATA" and the power pins on our board (marked with "DHT-VCC" and DHT-GND). Every pin used for the DHT is colored Green. The Display is connected onto the Display I2C Connector colored yellow.

The Code

                #include 
                #include 
                #include 
                
                
                //DHT Setup
                #define DHTPIN 1 // GP1 Pin of the Pi Pico 2 W
                #define DHTTYPE DHT22
                
                float temp;
                float humidity;
                DHT dht(DHTPIN, DHTTYPE);
                
                
                //LCD Setup
                LiquidCrystal_I2C lcd(0x27, 16, 2);
                
                
                
                void setup() {
                  Serial.begin(9600);
                
                  Wire1.setSDA(14); // set the SDA pin to GP14 of the Pi Pico 2W
                  Wire1.setSCL(15); // set the SCL pin to GP15 of the Pi Pico 2W
                
                  dht.begin();
                
                  lcd.init();       // Initialize the LCD
                  lcd.backlight();  // Turn on the backlight
                }
                
                void loop() {
                
                  // Read Sensor Data
                  temp = dht.readTemperature();
                  humidity = dht.readHumidity();
                    
                  // Debug Output of the SensorData to the serial Monitor
                  Serial.print("Temp: ");
                  Serial.print(temp);
                  Serial.println(" *C");
                  Serial.print("Hum : ");
                  Serial.print(humidity);
                  Serial.println(" %");
                
                  Serial.println();
                
                  //Sensor Data Output on Display
                  lcd.clear();
                  lcd.setCursor(0, 0);  // Set cursor to first row and display
                  lcd.print("Temp: ");
                  lcd.print(temp, 2);
                  lcd.print("  C");
                  lcd.setCursor(0, 1);  //Set coursor  to second row
                  lcd.print("Hum : ");
                  lcd.print(humidity);
                  lcd.println(" %   ");
                
                  delay(2000);
                }
        

Result