About

Temperature controller for charcoal or wood smoker.
Controller constantly reads temperature from sensor and adjust chimney damper using attached servo.

Hardware

• Board - STM32F103C8T6 AKA "Blue Pill"
• Temperature sensor - MAX6675 with type-K thermocouple
• Display - SSD1309
• Servo - any standard RC servo with PWM input and enough force to drive the damper
• Wiring - refer to hw.rs for GPIO pin connections

Toolchain setup

1. Prerequisites:
   • rustup
   • open-ocd
   • GDB (arm-none-eabi-gdb)
2. Install ARM target:

rustup target add thumbv7m-none-eabi

Flashing

1. Connect STLINK-V2
2. Run openocd session in another terminal (must be running for GDB to connect)

# "set CPUID" option needed to flash knockoff board (non-genuine STM32)
openocd -f interface/stlink.cfg -c "set CPUTAPID 0x2ba01477" -f target/stm32f1x.cfg

3. Flash and run GDB session:

cargo run -r

4. type "c" to see program running
5. ctrl+c and "q" quits GDB

Photos

• Display
• Damper with servo
• Overall setup