Spring 2018 ECE 4180 Final Project
Joseph Sterling and Aditya Mohile

Project Description

The DrawingBot is a Bluetooth enabled robot that uses a marker to draw what the user tells it to draw. The user sends commands via the Adafruit Bluetooth app, and the DrawingBot executes them.

The DrawingBot can draw:

• Shapes (circle, square, triangle, hexagon)
• Letters (will write out a word entered by user)

The Bluetooth Commands that the user sends to perform these actions are:

• draw <shape name> <shape side length (in inches)>
  • the side length parameter is optional. If omitted, the side length will be 3 inches
• write <desired word>

Parts List

You will need the following parts to recreate this project:

• Robot Chassis (Assembly Instructions: https://learn.sparkfun.com/tutorials/assembly-guide-for-redbot-with-shadow-chassis?_ga=2.199398830.1495204079.1525256543-704181064.1515515128)
• mbed board
• Adafruit bluetooth chip
• H-Bridge driver
• Servo
• External Power Supply
• Hall Effect Wheel Encoders https://www.sparkfun.com/products/12629

Wiring

Here are instructions on how to connect all of the components:

Bluetooth:

H-Bridge Driver:

Motors:

Servo:

Hall Effect Wheel Encoders:

Program

The following is the current program for the DrawingBot:

Examples

Drawing a hexagon with side length of 2 inches

Drawing a triangle with side length of 2 inches

Writing the word "HELLO"