Group Assignment Input Devices

FablLab Kamp-Lintfort Jan Bewersdorff

Assignment

• Probe an input device's analog levels and digital signals

This weeks Group Assignment is pretty close to what I did in my Individual Assignment for this week. I will again use the same sensors as in that Assignment: A Capacative Soil Moisture Sensor that sends analog signals and a DHT-11 Moisture and Temperature Sensor that sends digital values.

Since its far more interesting, I will start with the Soil Sensor. For this Assignment im going to use an Arduino Uno. I went ahead and plugged the Soil Senosr into the corresponding port on the UNO:

• VVC of SOil Sensor to 5V of Arduino Uno
• GND of Soil Sensor to GND of Arduino Uno
• AOUT of Soil Sensor to A0 of Arduino Uno

Connected, the contraption looked like this:

With the connection done, I wrote the simplest code to probe the Sensor I could think of:

int value;

void setup() {
  Serial.begin(115200);
}

void loop() {
  value = analogRead(A0);
  Serial.println(value);
  delay(50);
}

With this code uploaded to the Arduino Uno I just had to take a look at the Serial Plotter the IDE comes with to showcase the analog output of the Soil Sensor:

For the digital Signal, I chose to once again use a DHT-11 Sensor. I used the same code, I did in my Individual Assignment, just changed the Pin to Pin 2 of the Arduino Uno.

#include 
#include 

int sensor = 2;

DHT dht(sensor, DHT11);

void setup() {
  Serial.begin(115200);
  dht.begin();
}

void loop() {
  Serial.print("Temperature: ");
  Serial.print(dht.readTemperature());
  Serial.print("°C (");
  Serial.print(dht.readTemperature(true));
  Serial.print("°F); Humidity: ");
  Serial.print(dht.readHumidity());
  Serial.println("%");
  delay(500);
}

This code resulted in the following Readings:

To show a change of Values I clamped the Sensor between my Hands, so thats why temperature and Humidity are rising so sharply at the end!