项目六、温湿度lcd显示并上传服务器-爱代码爱编程
项目需求
使用温湿度传感器模块(DHT11)获取温度及湿度,并将值显示在LCD1602上,同时通过蓝牙模 块透传到手机
项目框图
硬件清单
DHT11 LCD1602 HC-08 继电器 杜邦线
a. LCD1602介绍及实战
硬件接线
引脚封装
RS、RW、EN三根信号线经常需要进行拉高/拉低操作,可以进行封装
#define RS_GPIO_Port GPIOB
#define RW_GPIO_Port GPIOB
#define EN_GPIO_Port GPIOB
#define RS_Pin GPIO_PIN_1
#define RW_Pin GPIO_PIN_2
#define EN_Pin GPIO_PIN_10
#define RS_HIGH HAL_GPIO_WritePin(RS_GPIO_Port, RS_Pin, GPIO_PIN_SET)
#define RS_LOW HAL_GPIO_WritePin(RS_GPIO_Port, RS_Pin, GPIO_PIN_RESET)
#define RW_HIGH HAL_GPIO_WritePin(RW_GPIO_Port, RW_Pin, GPIO_PIN_SET)
#define RW_LOW HAL_GPIO_WritePin(RW_GPIO_Port, RW_Pin, GPIO_PIN_RESET)
#define EN_HIGH HAL_GPIO_WritePin(EN_GPIO_Port, EN_Pin, GPIO_PIN_SET)
#define EN_LOW HAL_GPIO_WritePin(EN_GPIO_Port, EN_Pin, GPIO_PIN_RESET)
如何将一个字节的数据按位一次性发送到GPIOA的8个管脚?
GPIOA->ODR = cmd;
代码实现
#define RS_GPIO_Port GPIOB
#define RW_GPIO_Port GPIOB
#define EN_GPIO_Port GPIOB
#define RS_Pin GPIO_PIN_1
#define RW_Pin GPIO_PIN_2
#define EN_Pin GPIO_PIN_10
#define RS_HIGH HAL_GPIO_WritePin(RS_GPIO_Port, RS_Pin, GPIO_PIN_SET)
#define RS_LOW HAL_GPIO_WritePin(RS_GPIO_Port, RS_Pin, GPIO_PIN_RESET)
#define RW_HIGH HAL_GPIO_WritePin(RW_GPIO_Port, RW_Pin, GPIO_PIN_SET)
#define RW_LOW HAL_GPIO_WritePin(RW_GPIO_Port, RW_Pin, GPIO_PIN_RESET)
#define EN_HIGH HAL_GPIO_WritePin(EN_GPIO_Port, EN_Pin, GPIO_PIN_SET)
#define EN_LOW HAL_GPIO_WritePin(EN_GPIO_Port, EN_Pin, GPIO_PIN_RESET)
void Write_Cmd_Func(uint8_t cmd)
{
RS_LOW;
RW_LOW;
EN_LOW;
GPIOA->ODR = cmd;
HAL_Delay(5);
EN_HIGH;
HAL_Delay(5);
EN_LOW;
}
void Write_Data_Func(uint8_t dataShow)
{
RS_HIGH;
RW_LOW;
EN_LOW;
GPIOA->ODR = dataShow;
HAL_Delay(5);
EN_HIGH;
HAL_Delay(5);
EN_LOW;
}
void LCD1602_INIT(void)
{
//(1)延时 15ms
HAL_Delay(15);
//(2)写指令 38H(不检测忙信号)
Write_Cmd_Func(0x38);
//(3)延时 5ms
HAL_Delay(5);
//(4)以后每次写指令,读/写数据操作均需要检测忙信号
//(5)写指令 38H:显示模式设置
Write_Cmd_Func(0x38);
//(6)写指令 08H:显示关闭
Write_Cmd_Func(0x08);
//(7)写指令 01H:显示清屏
Write_Cmd_Func(0x01);
//(8)写指令 06H:显示光标移动设置
Write_Cmd_Func(0x06);
//(9)写指令 0CH:显示开及光标设置}
Write_Cmd_Func(0x0c);
}
void LCD1602_showLine(char row, char col, char *string)
{
switch(row){
case 1:
Write_Cmd_Func(0x80+col);
while(*string){
Write_Data_Func(*string);
string++;
}
break;
case 2:
Write_Cmd_Func(0x80+0x40+col);
while(*string){
Write_Data_Func(*string);
string++;
}
break;
}
}
main函数里:
//char position = 0x80 + 0x05;
//char dataShow = 'C';
LCD1602_INIT();
//Write_Cmd_Func(position);//选择要显示的地址
//Write_Data_Func(dataShow);//发送要显示的字符
LCD1602_showLine(1,5,"NO.2");
LCD1602_showLine(2,0,"LX handsome");
b. DHT11介绍及实战
硬件接线
DAT -- PB7
注意:PB7既作为输入,也作为输出,则不能直接在CubeMX里配置,需要自己写代码
引脚封装
#define DHT_HIGHT HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_SET)
#define DHT_LOW HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_RESET)
#define DHT_VALUE HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_7)
代码实现
#define DHT_HIGHT HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_SET)
#define DHT_LOW HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_RESET)
#define DHT_VALUE HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_7)
uint8_t datas[5];
void delay_us(uint16_t cnt) {
uint8_t i;
while (cnt) {
for (i = 0; i < 10; i++) {}
cnt--;
}
}
void DHT_GPIO_Init(uint32_t Mode) {
GPIO_InitTypeDef GPIO_InitStruct = {
0
};
__HAL_RCC_GPIOB_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Mode = Mode;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}
void DHT11_Start(void) {
DHT_GPIO_Init(GPIO_MODE_OUTPUT_PP);
DHT_HIGHT;
DHT_LOW;
HAL_Delay(30);
DHT_HIGHT;
DHT_GPIO_Init(GPIO_MODE_INPUT);
while (DHT_VALUE);
while (!DHT_VALUE);
while (DHT_VALUE);
}
void Read_Data_From_DHT() {
int i; //轮
int j; //每一轮读多少次
char tmp;
char flag;
DHT11_Start();
DHT_GPIO_Init(GPIO_MODE_INPUT);
for (i = 0; i < 5; i++) {
for (j = 0; j < 8; j++) {
while (!DHT_VALUE); //等待卡g点
delay_us(40);
if (DHT_VALUE == 1) {
flag = 1;
while (DHT_VALUE);
} else {
flag = 0;
}
tmp = tmp << 1;
tmp |= flag;
}
datas[i] = tmp;
}
}
int fputc(int ch, FILE * f) {
unsigned char temp[1] = {
ch
};
HAL_UART_Transmit( & huart1, temp, 1, 0xffff);
return ch;
}
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_USART1_UART_Init();
/* USER CODE BEGIN 2 */
printf("hello world\r\n");
HAL_Delay(2000);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1) {
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
//DHT_Get_Temp_Humi_Data(datas);
Read_Data_From_DHT();
printf("Temp: %d.%d ", datas[2], datas[3]);
printf("Humi: %d.%d\r\n", datas[0], datas[1]);
HAL_Delay(2000);
}
/* USER CODE END 3 */
}
项目设计及实现
项目设计
继电器数据线插在PB6上,DHT11及LCD1602接线与上述相同,大于25度继电器闭合
项目实现
注意点:
1. 不要忘记将Use MicroLIB的勾打上;
2. 不要忘记在main函数把串口中断打开;
3. 使用蓝牙模块时,记得将波特率设置为9600
char message[16];
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
Read_Data_From_DHT();
if (datas[2] >= 25)
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);
else
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);
memset(message, 0, sizeof(message));
sprintf(message, "Temp: %d.%d", datas[2], datas[3]);
LCD1602_showLine(1,0,message);
memset(message, 0, sizeof(message));
sprintf(message, "Humi: %d.%d", datas[0], datas[1]);
LCD1602_showLine(2,0,message);
HAL_Delay(1000);
}