7. Input & Output device¶

This week I worked on defining my final project idea and started to getting used to the documentation process.

Group work¶

Yaqeen Fardan and I worked together.

What is input and output devices?¶

An input device sends information to a computer system for processing, and an output device reproduces or displays the results of that processing. Input devices only allow for input of data to a computer and output devices only receive the output of data from another device.

Group work¶

Task1: connect some sensors with microcontroller.¶

Temperature and Humidity sensor “input device”.

How it is work? Temperature sensors work by providing readings via electrical signals. Sensors are composed of two metals that generate an electrical voltage or resistance when a temperature change occurs by measuring the voltage across the diode terminals. When the voltage increases, the temperature also increases.

reserch how can we connect the sensor to the MKR WiFi 1010.
For each sensor, there is a liberary that is needed to be downloaded.
First we downloaded the liberary for it by the steps below:

Then we tried to use the code from arduino and different connection:

#include <DFRobot_DHT11.h>
DFRobot_DHT11 DHT;
#define DHT11_PIN 10

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

void loop(){
  DHT.read(DHT11_PIN);
  Serial.print("temp:");
  Serial.print(DHT.temperature);
  Serial.print("  humi:");
  Serial.println(DHT.humidity);
  delay(1000);
}

Results: Tools –> Serial monitor

Task2: Servo motor.¶

Output device
Research about “servo motor arduino code mkrwifi 1010” we found this website
How does a servo motor work? A servo motor is an electromechanical device that produces torque and velocity based on the supplied current and voltage. A servo motor works as part of a closed loop system providing torque and velocity as commanded from a servo controller utilizing a feedback device to close the loop.

we tried to connected the servo motor with the sensor by the code below:

*/

#include <Servo.h>
#include <DFRobot_DHT11.h>
DFRobot_DHT11 DHT;
#define DHT11_PIN 7

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



Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

int pos = 0;    // variable to store the servo position

void setup() {
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
}

void loop() {
  for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
    // in steps of 1 degree
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15 ms for the servo to reach the position
  }
  for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15 ms for the servo to reach the position
  }
    DHT.read(DHT11_PIN);
  Serial.print("temp:");
  Serial.print(DHT.temperature);
  Serial.print("  humi:");
  Serial.println(DHT.humidity);
  delay(1000);

}

Task3: RGB LED¶

An RGB LED is a combination of three LEDs in just one package: red, green and blue; there are two kinds of RGB LEDs: common cathode and common anode RGB LEDs; you generate different colors by adjusting the brightness of each of the three LEDs of the RGB LED; to adjust the brightness of each LED, you use a PWM signal.

int red_light_pin= 4;
int green_light_pin = 5;
int blue_light_pin = 3;
void setup() {
  pinMode(red_light_pin, OUTPUT);
  pinMode(green_light_pin, OUTPUT);
  pinMode(blue_light_pin, OUTPUT);
}
void loop() {
  RGB_color(255, 0, 0); // Red
  delay(500);
  RGB_color(0, 255, 0); // Green
  delay(500);
  RGB_color(0, 0, 255); // Blue
  delay(500);
  RGB_color(255, 255, 125); // Raspberry
  delay(500);
  RGB_color(0, 255, 255); // Cyan
  delay(500);
  RGB_color(255, 0, 255); // Magenta
  delay(500);
  RGB_color(255, 255, 0); // Yellow
  delay(500);
  RGB_color(255, 255, 255); // White
  delay(500);
}
void RGB_color(int red_light_value, int green_light_value, int blue_light_value)
 {
  analogWrite(red_light_pin, red_light_value);
  analogWrite(green_light_pin, green_light_value);
  analogWrite(blue_light_pin, blue_light_value);
}

Task 4: Servo motor with Temperature sensor.¶

/*!
 * @file readDHT11.ino
 * @brief DHT11 is used to read the temperature and humidity of the current environment. 
 *
 * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license     The MIT License (MIT)
 * @author [Wuxiao](xiao.wu@dfrobot.com)
 * @version  V1.0
 * @date  2018-09-14
 * @url https://github.com/DFRobot/DFRobot_DHT11
 */

#include <DFRobot_DHT11.h>
DFRobot_DHT11 DHT;
#define DHT11_PIN 10
#include <Servo.h>
int temp;

Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

int pos = 0;    // variable to store the servo position
void setup(){
  Serial.begin(115200);
   myservo.attach(4);  // attaches the servo on pin 9 to the servo object
}

void loop(){
  DHT.read(DHT11_PIN);
  Serial.println(DHT.temperature);
  delay(1000);
  if (DHT.temperature > 15 && DHT.temperature <30){
      for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
    // in steps of 1 degree
      myservo.write(pos);              // tell servo to go to position in variable 'pos'
      delay(15);                       // waits 15 ms for the servo to reach the position
      }
      for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
      myservo.write(pos);              // tell servo to go to position in variable 'pos'
      delay(15);                       // waits 15 ms for the servo to reach the position
      }
  }
}

when Temp < 30 the motor will start to move.

Last update: September 12, 2022