Designing a Microcontroller Integrated with WiFi and a Mobile - - PowerPoint PPT Presentation

Designing a Microcontroller Integrated with WiFi and a Mobile Application for a Pellet Smoker

Course: ECE 4901, 2017-2018 Group 1811 Members: Adam Burns

• EE

Jason DeJesus

• EE/CompE

Trevor Svec

• CompE

Sponsoring Company: Seconn Fabrication, LLC Jason Pflomm, Engineering (860) 443-0000 jasonp@seconn.com

System Diagram

✔ ✔ ✔ ✔ ✔

Technical Details

• Developed digital driving circuit to control peripheral devices
• Raspberry Pi to control peripheral devices
• Ability to program peripheral devices and read temperature sensor data

with Pi

• Mobile app GUI setup with basic functionality
• Working on setting up Raspberry Pi to wirelessly receive and send data
• 320x480 3.5” LCD Screen loads bitmaps
• Switched from Python to C programming

○ 40 times faster (180 Khz to 7 Mhz), access to GPIO switching

AC to DC Power

CUI Inc. PSK-10B-S5

• Input: 85 - 264 VAC
• Output: 5V DC
• Current: 2A
• 25° C - 70° C (with

Derating)

• 79% Efficiency
• $12

Digital Driving Circuit

Digital Driving Circuit

Auger Motor Control Wire Igniter Control Wire Fan Control Wire AC Power

Temperature Sensor Configuration

MAX31865 PT100 RTD

LCD Screen

3.5" TFT LCD with Touchscreen Breakout Board

• perate in SPI mode, total of 7 pins
• 480x320 pixel color display
• 5V power
• ~1 second to load full bitmap

Wireless Configurations

Direct Access Indirect Access

• Bluetooth simpler, doesn’t cause

user to lose internet access

• WiFi direct would require

tethering a seperate internet connection

• WiFi will be used in the future as

well for controlling the smoker from anywhere

App Prototype

Budget

• Final prototype includes:

○ Digital Microcontroller w/ WiFi ○ Power Board ○ Display ○ App

• Should be no more than $100-$150
• Prototype can be more
• Price not including power

components from existing controller

Component Price Raspberry Pi 3 Model B $35 Adafruit 3.5” Display $30 AC to DC converter $12 Electrical Components $10 PT100 RTD Temperature sensor $11 MAX31865 Board $10 Total $108

Final Stages

• Feedback loop

Questions?

Comments?