Output devices 📋

Hello there..^^. Hope a large smile finds its way to your face inspite off all the panic that COVID-19 pendemic is causing <3 ^^. Let's hope everything will be fine now that we're on the 9th week of Fab Academy.. ^^

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A) Group Assignment:

Measure the power consumption of an output device.
Document your work (in a group or individually).

B) Individual Assignment:

Add an output device to a microcontroller board you've designed and program it to do something.

Output circuit function:

For this week I designed an output circuit that functions as follows:
The circuit basically sweeps a servo motor by changing from an angle to another in a particular speed, with an LED being lit while the motor is moving.

Output circuit desgin:

I. Schematic diagram:

I started my design based on hello echo board so, less time was consumed designing this circuit as I'm strating to get more & more comfortable and much more familiar with electronics design tools and the process of routing.
And here you can see the schematic diagram of my output circuit.

II. PCB design & routing:

Organising the PCB was relatively easy this time except for the wire crossing issue I told you about that led me to use an zero ohm resistor as a jumper wire after _honestly_ a considerable time spent in failed trials.
Here comes Awesome PCB no.03 ..^^

Output circuit Coding:

      int servoPin = 7;                                        
      int LED= 8;
      int myAngle;                                            
      int pulseWidth;                                         

      void setup ()
      {
        pinMode(LED, OUTPUT);
        pinMode(servoPin, OUTPUT);                         
      }

      void servoPulse(int servoPin, int myAngle)
      {
        pulseWidth = (myAngle * 10) + 600;                      
        digitalWrite(servoPin, HIGH);                               
        digitalWrite(LED, HIGH);
        delayMicroseconds(pulseWidth);                           
        digitalWrite(servoPin, LOW);
        digitalWrite(LED, LOW);

      }

      void loop()
        
      {
        for (myAngle=50; myAngle<=120; myAngle++)            
                                                                                            
        {                                                                       
          servoPulse(servoPin, myAngle);                                
          delay(20);                                                           
        }
        for (myAngle=120; myAngle>=50; myAngle--)            
                                                                      
        {                                                                       
          servoPulse(servoPin, myAngle);                               
          delay(20);                                                           
        }
      }
        

Output circuit manufacturing :

Unfortunately, I forgot to take a photo of the milled PCB before soldering the components. 😅

Aparently it wouldn't be me if all went well without any problems or stupid mistakes.😁😁
The really strange mistke this time was that I somehow designed the circuit as if servo pins order is (Ground , Signal, +5V) and all terminals of servo motors on earth are known to be (Ground , +5V , Signal). 🤦‍♀️🤦‍♀️

I really don't know or remember why or how I did this annoying mistake ><. But thank Allah it was something that could be overcame with the help of 3 female-male jumper wires.😌😄

Functioning output circuit:

Downloadables: 💾

Arduino File.inoHere
Eagle CAD Files .sch & .brdHere
Note: I fixed the order of the servo pins in the eagle files provided. ^^