G1. Group Assignment- Output Devices

• Measure the power consumption of an output device

Attached is the link to group assignment

Power Consumption Determination

In collaboration with my group, I determined the power consumption of our output device by measuring the voltage across it and the current flowing through it using a multimeter. We then calculated the power using the formula P = V x I.

Interfacing Output Devices

From interfacing the output devices to the microcontroller, I learned the importance of understanding the electrical characteristics of both the microcontroller pins and the devices. This ensured that we provided the correct voltage and current levels, avoiding damage to both the controller and the output device. Link to sg90 datasheet, key info shown in image below

Design and Fabrication Process

My design process started with a schematic in F360. After laying out the board, I fabricated it using a PCB mill, followed by soldering the components and the esp32 xiaO32c3. For more on the board I made in a previous assignment, visit this link. I wanted the servo to release balls in my final project. So i am trying out the rack and pinion in this video.
I at first had issues with my coding shown below.

Shortly, (Actually took awhile as i tried many search on troubleshooting), I found that ESP 32 have differemt timers from Arduino so library specific to ESP32 should be used.

I upload the code successfully and watch the servo turn in video below.

Next I draw some rack and and pinion to attach to my servo to convert rotational motion into translation mode. I hope to use the mechanism to help to release my balls from the slide. But this is only the first draft.

Programming Process

I used the Arduino IDE for programming the microcontroller. This involved writing the code, compiling it, and uploading it to the microcontroller using a USB connection. I programmed esp32 to control the servo.

Source Code

The following is the source code used for controlling the servo motor in our project. It utilizes the ESP32Servo library and is written in C++ for the Arduino programming environment:

        #include <ESP32Servo.h>
        
        Servo myservo;  // create servo object to control a servo
        int pos = 0;    // variable to store the servo position
        
        void setup() {
          myservo.setPeriodHertz(50);    // standard 50 hz servo
          myservo.attach(20, 500, 2400);  // attaches the servo on GPI20 to the servo object
                                          // and sets min and max microseconds
                                          // change these values to match your servo's specifications
        }
        
        void loop() {
          // Sweep the servo from 0 to 180 degrees
          for (pos = 0; pos <= 180; pos += 1) {
            myservo.write(pos);              // tell servo to go to position in variable 'pos'
            delay(15);                       // waits 15ms for the servo to reach the position
          }
          // Sweep the servo from 180 back to 0 degrees
          for (pos = 180; pos >= 0; pos -= 1) {
            myservo.write(pos);              // tell servo to go to position in variable 'pos'
            delay(15);                       // waits 15ms for the servo to reach the position
          }
        }
            

Problems Encountered

I encountered a challenge when I first attempted to upload the program to the microcontroller, receiving a 'no serial data received' error. After some research and troubleshooting, I found that pressing the boot button during the upload process resolved the issue. Next I encouteered challenge when I tried to use the servo.h library but Esp32 did not work with the library. hence i needed to get esp32servo library which works with my servo. I actually also done coding and documentation of my designed in easypcb ATTINy1614 for led strips & buzzer in the past, but i removed it as during that time, I only did not make my own programmer but use Arduino as programmer so had to redo but shown below is my work.

Design Files and Source Code

Below are the original design files and source code for my project.
- Design Files
- Source Code

Project 'Hero Shot'

Here is the 'hero shot' of my board. Actually, I dont like to have any hero shots, I am a teacher, I just like my students and young ones behind me to shine.