Week09-Input Devices

Group assignment:

  • Measure the power consumption of an output device.
  • Document your work on the group work page and reflect on your individual page what you learned.

Individual assignment:

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

CHECKLIST

  • Linked to the group assignment page.
  • Documented how you determined power consumption of an output device with your group.
  • Documented what you learned from interfacing output device(s) to microcontroller and controlling the device(s).
  • Linked to the board you made in a previous assignment or documented your design and fabrication process if you made a new board
  • Explained the programming process/es you used.
  • Explained any problems you encountered and how you fixed them.
  • Included original source code and any new design files.
  • Included a ‘hero shot of your board.

Group assignment

link

Individual assignment

I wanted to make a small claw, so I searched for relevant models on Thingiverse. Eventually, I found a model of a mechanical arm’s claw.

This is link:https://www.thingiverse.com/thing:6313449 1 1

I used a 3D printer to print it and i used PETG as the printing material, and I believe its strength is sufficient.

After printing was completed, I assembled it.

BOM：

Model number number
servo 1
m2*5 SHCS 2
Rubber bands 1

I started debugging the code.
I used the built-in buttons on my motherboard to control the servo motor.

1 1

Oh no, I failed. The reason is because the servo library does not support ESP32.

1 1

I tried switching to a servo library for ESP32, then I read through the example code it provided. Afterward, I modified my program.

1 1

It gave another error. After checking the Seeed Xiao’s wiki, the solution provided was to hold down the boot button until the upload is complete.

1 1

Oh, it finally uploaded successfully. 1 1

sorce file:

#include <ESP32Servo.h>

int SERVO_PIN = A0;
int BUTTON_PIN =  D10;

Servo servo;

void setup() {
  Serial.begin(9600);
  servo.attach(SERVO_PIN);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  int buttonState = digitalRead(BUTTON_PIN);

  if (buttonState == LOW) {
    Serial.println(BUTTON_PIN);
    servo.write(25); // 舵机转到 25 度
    delay(100);      // 给舵机时间转动
  } else {
    servo.write(0);  // 舵机转到 0 度
  }
}