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Code to control the speed of a PC fan, including setting various modes or using a PID controlled speed dial. A userinterface with an LCD is was used to show the user which mode the fan was in, the speed of the fan and the temperature of the PC.

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Fan & LCD Controller (Mbed OS)

This project demonstrates controlling a 4-bit ST7066U LCD, a PWM-controlled fan, and a rotary encoder using the Mbed OS platform.

Requirements

Board: NUCLEO-F446RE (or equivalent STM32 with Arduino header)
Libraries: mbed.h, TextLCD, LCD_ST7066U.h
Software: Mbed CLI 2 / Mbed Studio, GCC_ARM

Connections:

Function	MCU Pin	Notes
LCD RS	PA_6	4-bit interface
LCD E	PA_7
LCD D4-D7	PB_4, PB_5, PB_3, PA_10
Encoder A/B	PA_1 / PA_4	Interrupt inputs
Encoder button	BUTTON1
Fan PWM	PB_0	PWM output
Fan tachometer	PA_0	Interrupt input
LEDs	PA_15, PB_7, PC_0, LED1	Indicators

Build Instructions

mbed compile -m NUCLEO_F446RE -t GCC_ARM --flash

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Code to control the speed of a PC fan, including setting various modes or using a PID controlled speed dial. A userinterface with an LCD is was used to show the user which mode the fan was in, the speed of the fan and the temperature of the PC.

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