12. Output devices¶

Input LDR output LED with a Attiny 1614-SSFR¶

process to make a board => see week 5 ¶

loading the code¶

To upload the code I pay attention to this settings.

const int ledPin = 10;

const int ldrPin = 9;

void setup() {

Serial.begin(9600);

pinMode(ledPin, OUTPUT);

pinMode(ldrPin, INPUT);

}

void loop() {

int ldrStatus = analogRead(ldrPin);

if (ldrStatus <= 500) {

digitalWrite(ledPin, HIGH);

Serial.print("Its DARK => Turn on the LED : ");

Serial.println(ldrStatus);

} else {

digitalWrite(ledPin, LOW);

Serial.print("Its BRIGHT => Turn off the LED : ");

Serial.println(ldrStatus);

}

}

When I want to program in the Arduino IDE I name the pins with the brown colors. In this case 10 for the LED and 9 for the LDR.

Since I only had a 120 ohm resistor, I tried this one, insted the recommend 220 ohm.

After I adapted everything to my board, I uploaded the code via UPDI
and then the board is connected to the PC via FTDI in order to read out the serial monitor.

AnalogInOutSerial with with_a_ATMega88-THIN¶

I would like to design a building site milling machine as the final project. In preparation, I would like to control a spindle and regulate the speed using a potentiometer. Since my knowledge of C ++ is slowly growing, I will first combine different finished solutions on the Arduino to check whether everything works and then transfer this solution to my board from the Electronics Design Week.

/*
  Analog input, analog output, serial output

  Reads an analog input pin, maps the result to a range from 0 to 255 and uses
  the result to set the pulse width modulation (PWM) of an output pin.
  Also prints the results to the Serial Monitor.

  The circuit:
  - potentiometer connected to analog pin 0.
    Center pin of the potentiometer goes to the analog pin.
    side pins of the potentiometer go to +5V and ground
  - LED connected from digital pin 9 to ground

  created 29 Dec. 2008
  modified 9 Apr 2012
  by Tom Igoe

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/AnalogInOutSerial
*/

// These constants won't change. They're used to give names to the pins used:
const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to
const int analogOutPin = 9; // Analog output pin that the LED is attached to

int sensorValue = 0;        // value read from the pot
int outputValue = 0;        // value output to the PWM (analog out)

void setup() {
  // initialize serial communications at 9600 bps:
  Serial.begin(9600);
}

void loop() {
  // read the analog in value:
  sensorValue = analogRead(analogInPin);
  // map it to the range of the analog out:
  outputValue = map(sensorValue, 0, 1023, 0, 255);
  // change the analog out value:
  analogWrite(analogOutPin, outputValue);

  // print the results to the Serial Monitor:
  Serial.print("sensor = ");
  Serial.print(sensorValue);
  Serial.print("\t output = ");
  Serial.println(outputValue);

  // wait 2 milliseconds before the next loop for the analog-to-digital
  // converter to settle after the last reading:
  delay(2);
}

subject with variation¶

I supplement the original setup with a 9V circuit for the motor and replace the LED with a Mosfet. I now put pin 9 with a 2.2K resistor at the base to pass on the PWM to the motor.

transfer this setting on my board¶

For the pin arrangement, I used the following example from the fabacademy archive as a guide.

http://archive.fabacademy.org/2018/labs/fablabdassault/students/oyedotun-ajweole/exercise10.html

what pins on my board¶

I changed the pin assignment as follows.

Since it has happened several times that I had to count on 12 unknowns when troubleshooting, the process was easier because I transferred everything and only 3-4 unknowns came into question if something did not work.

making the board¶

process to make a board => see also week 5 ¶

group¶

In this example you can see very nicely how the consumption of the amperage increases when you put the motor under load by braking it with your thumb.