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硬件环境
ESP32、光照传感器、温湿度传感器、继电器、蜂鸣器 基本工作流程
上位机先运行#xff0c;下位机启动后尝试连接上位机连接成功后定时上报传感器数据到上位机#xff0c;上位机将信息进行处理展示判断下位机传感器数据#xff0c;如果超过设置的阈值下位机启动后尝试连接上位机连接成功后定时上报传感器数据到上位机上位机将信息进行处理展示判断下位机传感器数据如果超过设置的阈值则下发控制命令控制下位机硬件点击上位机控制按钮即可下发控制指令控制硬件
上位机运行效果 硬件连接图 DHT11 温湿度传感器
接线图 VCC 3V3
GND GND
DATA GPIO21D21 读取代码
#include stdio.h
#include freertos/FreeRTOS.h
#include freertos/task.h
#include driver/gpio.h
#include sdkconfig.h#define DHT11_PIN (21) //可通过宏定义修改引脚#define DHT11_CLR gpio_set_level(DHT11_PIN, 0)
#define DHT11_SET gpio_set_level(DHT11_PIN, 1)
#define DHT11_IN gpio_set_direction(DHT11_PIN, GPIO_MODE_INPUT)
#define DHT11_OUT gpio_set_direction(DHT11_PIN, GPIO_MODE_OUTPUT)uint8_t DHT11Data[4]{0};
uint8_t Temp, Humi;//us延时函数误差不能太大
void DelayUs( uint32_t nCount)
{ets_delay_us(nCount);
} void DHT11_Start(void)
{ DHT11_OUT; //设置端口方向DHT11_CLR; //拉低端口 DelayUs(19*1000);
// vTaskDelay(19 * portTICK_RATE_MS); //持续最低18ms;DHT11_SET; //释放总线DelayUs(30); //总线由上拉电阻拉高主机延时30uS;DHT11_IN; //设置端口方向while(!gpio_get_level(DHT11_PIN)); //DHT11等待80us低电平响应信号结束while(gpio_get_level(DHT11_PIN));//DHT11 将总线拉高80us
}uint8_t DHT11_ReadValue(void)
{ uint8_t i,sbuf0;for(i8;i0;i--){sbuf1; while(!gpio_get_level(DHT11_PIN));DelayUs(30); // 延时 30us 后检测数据线是否还是高电平 if(gpio_get_level(DHT11_PIN)){sbuf|1; }else{sbuf|0;}while(gpio_get_level(DHT11_PIN));}return sbuf;
}uint8_t DHT11_ReadTemHum(uint8_t *buf)
{uint8_t check;buf[0]DHT11_ReadValue();buf[1]DHT11_ReadValue();buf[2]DHT11_ReadValue();buf[3]DHT11_ReadValue();check DHT11_ReadValue();if(check buf[0]buf[1]buf[2]buf[3])return 1;elsereturn 0;
} void app_main(void)
{printf(ESP32 DHT11 TEST:%s,%s!\r\n,__DATE__,__TIME__);gpio_pad_select_gpio(DHT11_PIN);while(1) {DHT11_Start();if(DHT11_ReadTemHum(DHT11Data)){TempDHT11Data[2];HumiDHT11Data[0]; printf(Temp%d, Humi%d\r\n,Temp,Humi);}else{printf(DHT11 Error!\r\n);}vTaskDelay(1000); //目前10s读取一次}
} TEMT6000
接线图
VCC VCC
GND GND
OUT GPIO34D34 读取代码
#include driver/gpio.h
#include driver/adc.h
#include esp_adc_cal.h
#include freertos/FreeRTOS.h
#include freertos/task.h// ADC所接的通道 GPIO34 if ADC1 ADC1_CHANNEL_6
#define ADC1_TEST_CHANNEL ADC1_CHANNEL_6
// ADC斜率曲线
static esp_adc_cal_characteristics_t *adc_chars;
// 参考电压
#define DEFAULT_VREF 3300 //使用adc2_vref_to_gpio获得更好的估计值void check_efuse(void)
{//检查TP是否烧入eFuseif (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_TP) ESP_OK) {printf(eFuse Two Point: Supported\n);} else {printf(eFuse Two Point: NOT supported\n);}//检查Vref是否烧入eFuseif (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_VREF) ESP_OK) {printf(eFuse Vref: Supported\n);} else {printf(eFuse Vref: NOT supported\n);}
}
void adc_init(void)
{adc1_config_width(ADC_WIDTH_BIT_12);// 12位分辨率adc1_config_channel_atten(ADC1_TEST_CHANNEL, ADC_ATTEN_DB_11);// 电压输入衰减adc_chars calloc(1, sizeof(esp_adc_cal_characteristics_t)); // 为斜率曲线分配内存esp_adc_cal_value_t val_type esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, DEFAULT_VREF, adc_chars);// print_char_val_type(val_type);
}
void app_main(void)
{uint32_t read_raw;check_efuse();adc_init();while(1){read_raw adc1_get_raw(ADC1_TEST_CHANNEL);// 采集ADC原始值//这里可以多次采样取平均值uint32_t voltage esp_adc_cal_raw_to_voltage(read_raw, adc_chars);//通过一条斜率曲线把读取adc1_get_raw()的原始数值转变成了mVprintf(ADC原始值: %d 转换电压值: %dmV\n, read_raw, voltage);vTaskDelay(1000 / portTICK_RATE_MS);}
}延时1s
1200 手电筒1档2688 手电筒2档4079 手电筒3档 烟雾传感器
接线图 3V3 VCC GND GND DO GPIO15 AO GPIO2 读取代码
/* ADC1 ExampleThis example code is in the Public Domain (or CC0 licensed, at your option.)Unless required by applicable law or agreed to in writing, thissoftware is distributed on an AS IS BASIS, WITHOUT WARRANTIES ORCONDITIONS OF ANY KIND, either express or implied.
*/
#include stdio.h
#include stdlib.h
#include freertos/FreeRTOS.h
#include freertos/task.h
#include driver/gpio.h
#include driver/adc.h
#include esp_adc_cal.h#define DEFAULT_VREF 1100 //Use adc2_vref_to_gpio() to obtain a better estimate
#define NO_OF_SAMPLES 64 //Multisamplingstatic esp_adc_cal_characteristics_t *adc_chars;
#if CONFIG_IDF_TARGET_ESP32
static const adc_channel_t channel ADC_CHANNEL_6; //GPIO34 if ADC1, GPIO14 if ADC2
static const adc_bits_width_t width ADC_WIDTH_BIT_12;
#elif CONFIG_IDF_TARGET_ESP32S2
static const adc_channel_t channel ADC_CHANNEL_6; // GPIO7 if ADC1, GPIO17 if ADC2
static const adc_bits_width_t width ADC_WIDTH_BIT_13;
#endif
static const adc_atten_t atten ADC_ATTEN_DB_0;
static const adc_unit_t unit ADC_UNIT_1;static void check_efuse(void)
{
#if CONFIG_IDF_TARGET_ESP32//Check if TP is burned into eFuseif (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_TP) ESP_OK) {printf(eFuse Two Point: Supported\n);} else {printf(eFuse Two Point: NOT supported\n);}//Check Vref is burned into eFuseif (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_VREF) ESP_OK) {printf(eFuse Vref: Supported\n);} else {printf(eFuse Vref: NOT supported\n);}
#elif CONFIG_IDF_TARGET_ESP32S2if (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_TP) ESP_OK) {printf(eFuse Two Point: Supported\n);} else {printf(Cannot retrieve eFuse Two Point calibration values. Default calibration values will be used.\n);}
#else
#error This example is configured for ESP32/ESP32S2.
#endif
}static void print_char_val_type(esp_adc_cal_value_t val_type)
{if (val_type ESP_ADC_CAL_VAL_EFUSE_TP) {printf(Characterized using Two Point Value\n);} else if (val_type ESP_ADC_CAL_VAL_EFUSE_VREF) {printf(Characterized using eFuse Vref\n);} else {printf(Characterized using Default Vref\n);}
}void app_main(void)
{//Check if Two Point or Vref are burned into eFusecheck_efuse();//Configure ADCif (unit ADC_UNIT_1) {adc1_config_width(width);adc1_config_channel_atten(channel, atten);} else {adc2_config_channel_atten((adc2_channel_t)channel, atten);}//Characterize ADCadc_chars calloc(1, sizeof(esp_adc_cal_characteristics_t));esp_adc_cal_value_t val_type esp_adc_cal_characterize(unit, atten, width, DEFAULT_VREF, adc_chars);print_char_val_type(val_type);//Continuously sample ADC1while (1) {uint32_t adc_reading 0;//Multisamplingfor (int i 0; i NO_OF_SAMPLES; i) {if (unit ADC_UNIT_1) {adc_reading adc1_get_raw((adc1_channel_t)channel);} else {int raw;adc2_get_raw((adc2_channel_t)channel, width, raw);adc_reading raw;}}adc_reading / NO_OF_SAMPLES;//Convert adc_reading to voltage in mVuint32_t voltage esp_adc_cal_raw_to_voltage(adc_reading, adc_chars);printf(Raw: %d\tVoltage: %dmV\n, adc_reading, voltage);vTaskDelay(pdMS_TO_TICKS(1000));}
}蜂鸣器
接线图
VCC VCC
GND GND
I/O D2GPIO2 设置代码
#include stdio.h
#include stdlib.h
#include unistd.h
#include driver/gpio.h#define LED_PIN 2void app_main(void)
{gpio_reset_pin(LED_PIN); //引脚复位gpio_pad_select_gpio(LED_PIN); //GPIO引脚功能选择gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT); //设置方向为输出while (1){gpio_set_level(LED_PIN,1); //设置LED_PIN为高电平sleep(1);gpio_set_level(LED_PIN,0); //设置LED_PIN为低电平sleep(1);}
} 继电器
DCVCC 接 1口
DC- (GND)接 6 口
IN1 接 7 口 系统整体代码
Github仓库地址
