一，前言

当今生活中，风扇已成为人们解暑的重要工具，然而使用风扇缓解夏日酷热的同时也存在着一些问题，传统风扇只能根据选择的档位来设置转速，而不能根据周围环境温度的变化而自动调节转速。基于以上设计了自动调速风扇系统。

二，系统方案选择

本系统由按键控制和液晶显示两部分组成。工作区内由单片机stm32F103C8热敏电阻传感器，当温度达到设定阈值时，从而通过PWM控制电机做相应动作。

环境温度采集模块：采用热敏电阻，可满足 40 摄氏度至 90 摄氏度测量范围

电机模块：采用舵机同直流电机搭配，舵机具有扭力大容易控制。小型直流减速电机，减速电机控制精度低，且速度均匀性好，控制简单，电源要求低，易于实现。

T86612FNG电机驱动 ,直流电机130

显示模块：OLED显示屏，快速插接小巧设计，是内容显示和程序调试的利器，从此程序清晰可见。

舵机：SG90

如图2为STM32F103单片机最小系统电路原理图。该最小系统电路主要包括时钟、按键复位和供电电路三部分。

三，实体展示

工程分类

四，相关代码

PWM.c

#include "stm32f10x.h"                  // Device headervoid PWM_Init1(void)
{GPIO_InitTypeDef GPIO_InitStructure; 			//定义GPIO初始化结构体变量TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;TIM_OCInitTypeDef TIM_OCInitStructure;RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);  //开启定时器2RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);//通道2时钟使能函数GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//设置GPIO为推挽输出模式GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //PA1 PA2			GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	//速度设置为 50MHzGPIO_Init(GPIOA, &GPIO_InitStructure);	//按照以上参数进行 GPIO的初始化TIM_InternalClockConfig(TIM2);//TIM的时基单元由内部时钟控制TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;TIM_TimeBaseInitStructure.TIM_Period = 20000 - 1; //ARR 自动重装器的值TIM_TimeBaseInitStructure.TIM_Prescaler = 72 - 1; //PSC 预分频器的值 对72M（720000000）进行 7200分频 即10K的频率下 计10000个数 1s的时间TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;//重复计数器的值 CCRTIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructure); TIM_OCStructInit(&TIM_OCInitStructure);TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//输出极性选择TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//输出状态使能TIM_OCInitStructure.TIM_Pulse = 20;//CCR,即占空比为 10%TIM_OC2Init(TIM2,&TIM_OCInitStructure);//OC编号要与通道编号对应TIM_Cmd(TIM2,ENABLE);
}void PWM_Init(void)
{GPIO_InitTypeDef GPIO_InitStructure; 			//定义GPIO初始化结构体变量TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;TIM_OCInitTypeDef TIM_OCInitStructure;RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);  //开启定时器3RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);//通道2时钟使能函数GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//设置GPIO为推挽输出模式GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	//速度设置为 50MHzGPIO_Init(GPIOB, &GPIO_InitStructure);	//按照以上参数进行 GPIO的初始化TIM_InternalClockConfig(TIM3); //内部时钟配置TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;TIM_TimeBaseInitStructure.TIM_Period = 100 - 1; //ARR 自动重装器的值TIM_TimeBaseInitStructure.TIM_Prescaler = 72 - 1; //PSC 预分频器的值 TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;//重复计数器的值 CCRTIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure); TIM_OCStructInit(&TIM_OCInitStructure);TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//输出极性选择TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//输出状态使能TIM_OCInitStructure.TIM_Pulse = 50;//CCR,即占空比为 10%TIM_OC3Init(TIM3,&TIM_OCInitStructure);//OC编号要与通道编号对应//TIM_OC2Init(TIM3,&TIM_OCInitStructure);//OC编号要与通道编号对应TIM_Cmd(TIM3,ENABLE);
}void PWM_SetCompare_Servo(uint16_t Compare) //舵机
{TIM_SetCompare2(TIM2, Compare);
}void PWM_SetCompare_Motor(uint16_t Compare) //风扇
{TIM_SetCompare3(TIM3, Compare);}

PWM.h

#ifndef __PWM_H
#define __PWM_Hvoid PWM_Init(void);
void PWM_Init1(void);void PWM_SetCompare_Motor(uint16_t Compare);
void PWM_SetCompare_Servo(uint16_t Compare);#endif

AD.c

#include "stm32f10x.h"                  // Device headervoid AD_Init(void)
{RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);RCC_ADCCLKConfig(RCC_PCLK2_Div6);GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);ADC_InitTypeDef ADC_InitStructure;ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;ADC_InitStructure.ADC_ScanConvMode = DISABLE;ADC_InitStructure.ADC_NbrOfChannel = 1;ADC_Init(ADC1, &ADC_InitStructure);ADC_Cmd(ADC1, ENABLE);ADC_ResetCalibration(ADC1);while (ADC_GetResetCalibrationStatus(ADC1) == SET);ADC_StartCalibration(ADC1);while (ADC_GetCalibrationStatus(ADC1) == SET);
}uint16_t AD_GetValue(void)
{ADC_SoftwareStartConvCmd(ADC1, ENABLE);while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);return ADC_GetConversionValue(ADC1);
}

AD.h

#ifndef __AD_H
#define __AD_Hvoid AD_Init(void);
uint16_t AD_GetValue(void);#endif

电机驱动程序

#include "stm32f10x.h"                  // Device header
#include "PWM.h"
#include "Delay2.h"
#include "OLED.h"
#include "LED1.h"
#include "Key.h"float Speed=0;
void Motor_Init(void)
{RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);PWM_Init1();
}void Motor_SetSpeed(int8_t Speed)
{if (Speed >= 0){GPIO_ResetBits(GPIOA, GPIO_Pin_4);GPIO_SetBits(GPIOA, GPIO_Pin_5);PWM_SetCompare_Motor(Speed);}else{GPIO_SetBits(GPIOA, GPIO_Pin_4);GPIO_ResetBits(GPIOA, GPIO_Pin_5);PWM_SetCompare_Motor(-Speed);}
}
void Motor_Speed_Set(uint8_t KeyNum)
{//Key_Init1();//Key_Init();//KeyNum = Key_GetNum();if(KeyNum == 1){Speed += 20;if(Speed > 80){Speed =0;}}void LED11_OFF(void);void LED22_ON(void);OLED_ShowNum(3,7,Speed,3);OLED_ShowNum(2,8,KeyNum,1);Motor_SetSpeed(Speed);}

舵机驱动

#include "stm32f10x.h"                  // Device header
#include "PWM.h"#include "OLED.h"#include "Key.h"
#include "LED1.h"float Angle;void Servo_Init(void)
{PWM_Init();
}void Servo_SetAngle(float Angle)
{PWM_SetCompare_Servo(Angle / 180 * 2000 + 500);
}
void Servo_Turn(uint8_t KeyNum)
{	KeyNum = Key_GetNum();if (KeyNum == 2){Angle += 30;if (Angle > 180){Angle = 0;}}Servo_SetAngle(Angle);OLED_ShowNum(2,8,KeyNum,1);OLED_ShowNum(1, 7, Angle, 3);}

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