stm32f103ve+光电传感器使用教程+oled(HAL库)
最近想做一个物联网农业监控系统,第一步就是能够学会使用相关的外设,比如温湿度检测,光照强度检测,还有CO2检测等。
这次讲一下光电传感器的使用和代码实现。
1.知识储备:串口使用,ADC采集(此处用的ADC3)。
2.硬件:stm32f103ve开发板+4pin光电传感器+4pin_oled
AO | DO | VCC | GND |
---|---|---|---|
模拟电压输出,有两种状态,一般用不到 | 数字开关量输出,接的开发板的ADC脚 | 接vcc,3.3~ 5v | 接地 |
3.使用串口讲解:
main.c
uint8_t receivedata[1];
uint16_t ADC_Value = 0;
float ADC_Volt = 0;
uint8_t str_buff[64] = {0};
void Show_date()
{
printf("%.2f",ADC_Volt);
}
void Get_ADC_Value()
{
HAL_ADC_Start(&hadc3);
if(HAL_ADC_PollForConversion(&hadc3,10) == HAL_OK)
{
ADC_Value = HAL_ADC_GetValue(&hadc3);
ADC_Volt = (ADC_Value * 3.3)/4096;//单位为10mv
Show_date();
}
}
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_ADC3_Init();
MX_DMA_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
HAL_UART_Receive_IT(&huart1,(uint8_t *)receivedata,1);//开启串口
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
printf("light:");
Get_ADC_Value();
printf("\r\n");
HAL_Delay(100);
}
/* USER CODE END 3 */
}
/* USER CODE BEGIN 4 */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)//接收回调函数
{
if(huart ->Instance == USART1 )
{
HAL_UART_Receive_IT (&huart1 ,(uint8_t *)receivedata ,1);
}
}
/* USER CODE END 4 */
usart.c
int fputc(int ch, FILE *f)
{
HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xffff);
return ch;
}
int fgetc(FILE * f)
{
uint8_t ch = 0;
HAL_UART_Receive(&huart1,&ch, 1, 0xffff);
return ch;
}
结果:
4.使用OLED 屏幕显示:
四脚的oled,SCLK和SDA在CUBEMX找两个脚置成输出模式即可。
oled的使用网上有教程,请自行移植。
代码:
mian.c
#include "main.h"
#include "adc.h"
#include "dma.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "oled.h"
#include "stdio.h"
uint16_t ADC_Value = 0;
uint16_t ADC_Volt = 0;
uint8_t str_buff[64] = {0};
void Show_start();
void OLED_show_data();
void OLED_disp_data();
void Get_ADC_Value();
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_ADC3_Init();
/* USER CODE BEGIN 2 */
OLED_Init();
Show_start();
HAL_Delay(1000);
OLED_Clear();
// OLED_show_data();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
OLED_show_data();
Get_ADC_Value();
}
/* USER CODE END 3 */
}
/* USER CODE BEGIN 4 */
void Show_start()
{
OLED_Clear();
OLED_ShowChinese(0,0,0,16);
OLED_ShowChinese(16,0,1,16);
OLED_Refresh();
}
void OLED_show_data()
{
OLED_ShowChinese(0,0,2,16);
OLED_ShowChinese(16,0,3,16);
OLED_ShowString(32,0,":",16);
OLED_Refresh();
}
void OLED_disp_data()
{
sprintf((char *)str_buff,"%d.%d%d",ADC_Volt/100,(ADC_Volt%100)/10,ADC_Volt%10);
OLED_ShowString(48,0,str_buff,16);
}
void Get_ADC_Value()
{
HAL_ADC_Start(&hadc3);
if(HAL_ADC_PollForConversion(&hadc3,10) == HAL_OK)
{
ADC_Value = HAL_ADC_GetValue(&hadc3);
ADC_Volt = ADC_Value * 330/4096;//单位为10mv
OLED_disp_data();
}
}
/* USER CODE END 4 */
结果显示:
想要完整工程
链接:https://pan.baidu.com/s/1OP7wtyOTdvw8_M2gYLfXYw提取码:22kh
链接:https://pan.baidu.com/s/1bl3cA8-8uHEv5rSId5UCxg提取码:abdc
本人能力有限,如有不足请指正。