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 AC Power Fan Control Wire
Temperature Sensor Configuration MAX31865 PT100 RTD
LCD Screen 3.5" TFT LCD with Touchscreen Breakout Board operate in SPI mode, total of 7 pins ● 480x320 pixel color display ● 5V power ● ~1 second to load full bitmap ●
Wireless Configurations Indirect Access Direct 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 Component Price Raspberry Pi 3 Model B $35 Final prototype includes: ● Adafruit 3.5” Display $30 Digital Microcontroller w/ WiFi ○ Power Board ○ AC to DC converter $12 Display ○ App ○ Electrical Components $10 Should be no more than $100-$150 ● Prototype can be more ● PT100 RTD Temperature $11 Price not including power ● sensor components from existing controller MAX31865 Board $10 Total $108
Final Stages Feedback loop ●
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