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Skill sorting [email protected]+ Alibaba cloud +nbiot+dht11+bh1750+ soil moisture sensor +oled
2022-06-30 10:32:00 【Sky_ Lannister】
Use DHT11 The temperature and humidity sensor measures temperature and humidity , Use BH1750 Measure the light intensity , Use soil moisture sensor to measure soil moisture . Need to do PCB The board ,32+pcb+ sensor +oled Display these data
1、 Project brief introduction
2、 Implementation logic
# adopt dht11 Detect temperature and humidity
# adopt bh1750 Check the light intensity
# adopt adc Detect soil moisture
# Display the data to oled And send to through serial port nbiot modular , Then go to alicloud
3、 Application scenarios
# Remote detection of environmental parameters
4、 Sort out the core code
// The code is reused several times before it is used. It doesn't matter , It is important to nbiot Module configuration
//temp hump
void DHT11_IO_IN(void) {
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.Pin = DHT11_Pin;
GPIO_InitStructure.Mode = GPIO_MODE_INPUT;
HAL_GPIO_Init(GPIOA,&GPIO_InitStructure);
}
void DHT11_IO_OUT(void) {
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.Pin = DHT11_Pin;
GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOA,&GPIO_InitStructure);
}
void DHT11_Rst(void) {
DHT11_IO_OUT(); //
DHT11_DQ_OUT_LOW; //
HAL_Delay(20); //
DHT11_DQ_OUT_HIGH; //
delay_us(30); //
}
uint8_t DHT11_Check(void) {
uint8_t retry=0;
DHT11_IO_IN();
while (DHT11_DQ_IN && retry<100) {
retry++;
delay_us(1);
};
if(retry>=100)return 1;
else retry=0;
while (!DHT11_DQ_IN&&retry<100) {
retry++;
delay_us(1);
};
if(retry>=100)return 1;
return 0; //DHT11
}
uint8_t DHT11_Read_Bit(void) {
uint8_t retry=0;
while(DHT11_DQ_IN&&retry<100) {
retry++;
delay_us(1);
}
retry=0;
while(!DHT11_DQ_IN&&retry<100) {
retry++;
delay_us(1);
}
delay_us(40);
if(DHT11_DQ_IN)return 1;
else return 0;
}
uint8_t DHT11_Read_Byte(void) {
uint8_t i,dat;
dat=0;
for (i=0; i<8; i++) {
dat<<=1;
dat|=DHT11_Read_Bit();
}
return dat;
}
uint8_t DHT11_Read_Data(uint16_t *temp,uint16_t *humi) {
uint8_t buf[5];
uint8_t i;
DHT11_Rst();
if(DHT11_Check()==0) {
for(i=0; i<5; i++) {
buf[i]=DHT11_Read_Byte();
}
if((buf[0]+buf[1]+buf[2]+buf[3])==buf[4]) {
*humi=(buf[0]<<8) + buf[1];
*temp=(buf[2]<<8) + buf[3];
}
} else return 1;
return 0;
}
uint8_t DHT11_Init(void) {
DHT11_Rst();
return DHT11_Check();
}
bh1750****************//
/*** Start signal ***/
void BH1750_Start()
{
HAL_GPIO_WritePin(GPIOB, BH1750_SDA_Pin,GPIO_PIN_SET); // Pull up the data line
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_SET); // Pull up the clock line
delay_us(5); // Time delay
HAL_GPIO_WritePin(GPIOB, BH1750_SDA_Pin,GPIO_PIN_RESET); // Produce a falling edge
delay_us(5); // Time delay
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_RESET); // Pull down the clock line
}
/***** Stop signal ******/
void BH1750_Stop()
{
HAL_GPIO_WritePin(GPIOB, BH1750_SDA_Pin,GPIO_PIN_RESET); // Pull down the data line
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_SET); // Pull up the clock line
delay_us(5); // Time delay
HAL_GPIO_WritePin(GPIOB, BH1750_SDA_Pin,GPIO_PIN_SET); // To produce a rising edge
delay_us(5); // Time delay
}
/************************************** Send reply signal Entrance parameters :ack (0:ACK 1:NAK) **************************************/
void BH1750_SendACK(int ack)
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_11;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
if(ack == 1) // Write reply signal
HAL_GPIO_WritePin(GPIOB, BH1750_SDA_Pin,GPIO_PIN_SET);
else if(ack == 0)
HAL_GPIO_WritePin(GPIOB, BH1750_SDA_Pin,GPIO_PIN_RESET);
else
return;
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_SET); // Pull up the clock line
delay_us(5); // Time delay
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_RESET); // Pull down the clock line
delay_us(5); // Time delay
}
/************************************** Receive a reply signal **************************************/
int BH1750_RecvACK()
{
int mcy;
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT; /* This must be set to input pull-up , Otherwise, the data cannot be read out */
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Pin = BH1750_SDA_Pin;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_SET); // Pull up the clock line
delay_us(5); // Time delay
if(HAL_GPIO_ReadPin( GPIOB, BH1750_SDA_Pin ) == 1 )// Read the answer signal
mcy = 1 ;
else
mcy = 0 ;
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_RESET); // Pull down the clock line
delay_us(5); // Time delay
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
HAL_GPIO_Init( GPIOB, &GPIO_InitStruct );
return mcy;
}
/************************************** towards IIC The bus sends a byte of data **************************************/
void BH1750_SendByte(uint8_t dat)
{
uint8_t i;
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_RESET); // Pull down the clock line
delay_us(2); // Time delay
for (i=0; i<8; i++) //8 Bit counter
{
if( 0X80 & dat )
HAL_GPIO_WritePin(GPIOB, BH1750_SDA_Pin,GPIO_PIN_SET);
else
HAL_GPIO_WritePin(GPIOB, BH1750_SDA_Pin,GPIO_PIN_RESET);
dat <<= 1;
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_SET); // Pull up the clock line
delay_us(2); // Time delay
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_RESET); // Pull down the clock line
delay_us(2); // Time delay
}
//BH1750_RecvACK();
}
/************************************** from IIC The bus reads a byte of data **************************************/
uint8_t BH1750_RecvByte()
{
uint8_t i;
uint8_t dat = 0;
uint8_t bit;
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT; /* This must be set to input pull-up , Otherwise, the data cannot be read out */
GPIO_InitStruct.Pin = BH1750_SDA_Pin;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init( GPIOB, &GPIO_InitStruct );
//HAL_GPIO_WritePin(GPIOB, BH1750_SDA_Pin,GPIO_PIN_SET); // Enable internal pull-up , Ready to read data ,
for (i=0; i<8; i++) //8 Bit counter
{
//dat <<= 1;
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_RESET); // Pull up the clock line
delay_us(2); // Time delay
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_SET);
dat <<= 1;
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_SET);
if( SET == HAL_GPIO_ReadPin( GPIOB, BH1750_SDA_Pin ) )
dat |= 0X01;
// Pull down the clock line
delay_us(1); // Time delay
}
HAL_GPIO_WritePin(GPIOB, BH1750_SCL_Pin,GPIO_PIN_RESET);
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
HAL_GPIO_Init( GPIOB, &GPIO_InitStruct );
return dat;
}
void Init_BH1750()
{
BH1750_Start();
BH1750_SendByte(0x46);
BH1750_SendByte(0x01);
BH1750_Stop();
}
void Single_Write_BH1750(u8 REG_Address)
{
BH1750_Start();// Start signal
BH1750_SendByte(0x46);// Send device address + Write the signal
BH1750_RecvACK();
BH1750_SendByte(REG_Address);// Internal address , Please refer to Chinese pdf22 page
BH1750_RecvACK();
BH1750_Stop();// Send stop signal
}
/********************************************************* Continuous reading BH1750 internal data *********************************************************/
void Multiple_Read_BH1750()
{
BH1750_Start();// Start signal
BH1750_SendByte(0x47);// Send device address + Read the signal
BH1750_RecvACK();
BUF[0] = BH1750_RecvByte();//BUF[0] Storage 0x32 The data in the address
BH1750_SendACK(0);
BUF[1] = BH1750_RecvByte();//BUF[0] Storage 0x32 The data in the address
BH1750_SendACK(1);
BH1750_Stop();// Stop signal
HAL_Delay(5);
}
// Continuous reading BH1750 internal data
void mread(void)
{
u8 i=0;
Single_Write_BH1750(0x01);// power on
Single_Write_BH1750(0x10);// H- resolution mode
HAL_Delay(18);// Time delay 18ms
Multiple_Read_BH1750();// Read data continuously , Stored in BUF in
}
/* towards onenet The platform sends data functions * return 1 ok; 0 fail */
uint8_t send_onenet(void)
{
char text[200];
uint8_t len;
memset(text, 0, sizeof(text));
// Package
memset(text, 0, sizeof(text));
sprintf(text, "bbbWenDu:%.2f C; ShiDu: %.2f %; TuRang:%.2f %; GuangZhao:%d Lux;",temp, hump, check_hump, light);
// Packet
len = strlen(text);
HAL_UART_Transmit(&huart1, (uint8_t *)text, len, 0xFFFF); // send out
HAL_Delay(1000);
return 1;
}
/* USER CODE END 0 */
/** * @brief The application entry point. * @retval int */
int main(void)
{
/* USER CODE BEGIN 1 */
uint32_t clk;
tx_nbiot[0] = 0xff;
tx_nbiot[1] = 0x74;
tx_nbiot[13] = 0xff;
/* 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();
MX_ADC1_Init();
MX_TIM1_Init();
/* USER CODE BEGIN 2 */
OLED_Init();
OLED_ColorTurn(0);//
OLED_DisplayTurn(0);//
OLED_Refresh();
OLED_Clear();
OLED_ShowString(0,0,"TEMP: . C",16);
OLED_ShowString(0,14,"HUMP: . %",16);
OLED_ShowString(0,28,"GROUND: . %",16);
OLED_ShowString(0,42,"LIGHT: LUX",16);
OLED_Refresh();
/****dht11*****/
uint8_t int_num = 3;
while(int_num--) {
HAL_Delay(500);
DHT11_Init();
}
__HAL_UART_ENABLE_IT(&huart1,UART_IT_RXNE);//open uart1 RXNE
//Init_BH1750();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
check_hump = 4092-ADC_num;
check_hump = (float)(check_hump/3292*100);//ad->hump%
if((check_hump >= 0) && (check_hump <= 100))
{
intH = (int)check_hump;
float hum_tmp = check_hump - intH;
hum_tmp *= 100;
decH = hum_tmp;
tx_nbiot[6] = intH;
tx_nbiot[7] = decH;
}
HAL_ADC_Start_IT(&hadc1);
DHT11_Read_Data(&temperature,&humidity);
// OLED_ShowNum(39,0,temperature>>8,4,12);
// OLED_ShowNum(80,0,temperature&0xff,2,12);
// OLED_ShowNum(39,2,humidity>>8,4,12);
// OLED_ShowNum(80,2,humidity&0xff,2,12);
tx_nbiot[2] = temperature>>8;
tx_nbiot[3] = temperature&0xff;
tx_nbiot[4] = humidity>>8;
tx_nbiot[5] = humidity&0xff;
temp = tx_nbiot[2]*100 + tx_nbiot[3];
temp = temp/100;
hump = tx_nbiot[4]*100 + tx_nbiot[5];
hump = hump/100;
// light_temp = GetLight();
// light = light_temp;
mread();
light_temp = BUF[0];
light_temp=(light_temp<<8)+BUF[1];// Synthetic data
light=light_temp/1.2;
OLED_ShowNum(53,0,tx_nbiot[2],2,16); //temp
OLED_ShowNum(77,0,tx_nbiot[3],2,16);
OLED_ShowNum(53,14,tx_nbiot[4],2,16);//hump
OLED_ShowNum(77,14,tx_nbiot[5],2,16);
OLED_ShowNum(53,28,tx_nbiot[6],2,16);//ground
OLED_ShowNum(77,28,tx_nbiot[7],2,16);
OLED_ShowNum(53,42,light,5,16);//LIGHT
OLED_Refresh();
tx_nbiot[8] = (light>>8)&0xff;
tx_nbiot[9] = light&0xff;
if(clk % 10 == 0) //
send_onenet();
// if(rx_ok)
// {
// //rx_order++;
// rx_ok = 0;
// }
HAL_Delay(500);
HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
clk++;
}
/* USER CODE END 3 */
}
5、 Some references
Official website of Hezhou system http://erp.openluat.com/
DTU Management system ：https://dtu.yinerda.com/#/user/login
Physical network card management ：http://sim.openluat.com/
# Schematic diagram of circuit board pcb See information package
6、 matters needing attention
#nbiot The module does not need a card , It needs to be well configured
Full operational project address
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