Coffee Bean Roaster
Mirwais Lodin, Andrew Liu, Liam Sebastian Mchugh, Carlson Jansen
Embedded Files
Overview
Overview
Implementing a functional precision temperature control for equipment like a Coffee Bean Roaster, by recycling simple popcorn maker with built in heater, fan, and AC power distribution. recreating thermocouple module, AC or DC heat fan dimmer/control board, wall plug AC/DC converter, additional app/GUI control on-screen display. Precise feedback control of temperature in the chamber.
Bill of Materials (BoM)
Bill of Materials (BoM)
Total cost: $99.12
Schematic
Schematic
Voltage drop-down module:
DC-DC Converters
24V to 3.3V
24V to 5V
USB C receptacle
USB Voltage drop down:
-LDO linear Regulator
ESP32-S2-SOLO:
assigned GPIO:
-thermocouple: SO, SCK,CS
-LCD I2C: sda,scl
-Fan relay
-Heater relay
-Boot button
-Reset button
LCD I2C:
Generic 20x4 LCD display, replicate I2C board with IO expander
Thermocouple module:
MAX31855 IC, screw terminal connected to k-type thermocouple
Additional COTS components not included in schematics:
-3V AC relays for Heater and Fan
-AC/DC converter Barrel Jack → Output 24V 1A, 100 ~ 240 VDC Input
Layout
Layout
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