HTU21D 温湿度传感器

ESP32-C3 版本

以下是使用 ESP32-C3 的 ESP_IDF 框架开发的代码，用于读取 HTU21D 温湿度传感器数据：
#include <stdio.h>
#include <string.h> // 添加这一行
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "driver/i2c_master.h"
#include "time.h"
#include <sys/time.h> // 添加这个头文件

#define I2C_MASTER_NUM I2C_NUM_0
#define I2C_MASTER_SCL_IO 4
#define I2C_MASTER_SDA_IO 5
#define I2C_MASTER_TIMEOUT_MS 1000

#define HTU21D_ADDR_LEN I2C_ADDR_BIT_LEN_7
#define HTU21D_I2C_ADDR 0x40      // HTU21D 的 I2C 地址
#define TRIGGER_TEMP_MEASURE  0xE3
#define TRIGGER_HUMI_MEASURE  0xE5

i2c_master_dev_handle_t dev_handle;
// 读取温度
uint16_t  read_sensor(uint8_t cmd)
{
    uint8_t data[3] = {0};
    // 发送测量命令（关键修正）
    ESP_ERROR_CHECK(i2c_master_transmit(dev_handle, &cmd, 1, -1)); // 发送触发命令如0xE3/0xE5

    // 等待测量完成（含时钟拉伸）
    vTaskDelay(pdMS_TO_TICKS(50)); // 最大测量时间50ms 

    // 读取数据
    ESP_ERROR_CHECK(i2c_master_receive(dev_handle, data, 3, -1));

    // CRC校验和数据处理（保持原逻辑）
    // if (crc8(data, 2) != data[2]) {
    //     ESP_LOGE("HTU21D", "CRC error");
    //     return 0xFFFF;
    // }
    return (data[0] << 8) | data[1];
}
float read_temperature() {
    uint16_t raw = read_sensor(TRIGGER_TEMP_MEASURE);
    return -46.85 + 175.72 * (raw / 65536.0f); // 数据手册公式
}

float read_humidity() {
    uint16_t raw = read_sensor(TRIGGER_HUMI_MEASURE);
    return -6.0 + 125.0 * (raw / 65536.0f); // 数据手册公式
}

void app_main(void)
{

    i2c_master_bus_config_t i2c_mst_config = {
        .clk_source = I2C_CLK_SRC_DEFAULT,
        .i2c_port = I2C_MASTER_NUM,
        .scl_io_num = I2C_MASTER_SCL_IO,
        .sda_io_num = I2C_MASTER_SDA_IO,
        .glitch_ignore_cnt = 7,
        .flags.enable_internal_pullup = true,
    };

    i2c_master_bus_handle_t bus_handle;
    ESP_ERROR_CHECK(i2c_new_master_bus(&i2c_mst_config, &bus_handle));

    i2c_device_config_t dev_cfg = {
        .dev_addr_length = HTU21D_ADDR_LEN,
        .device_address = HTU21D_I2C_ADDR,
        .scl_speed_hz = 100000,
    };

    // i2c_master_dev_handle_t dev_handle;
    ESP_ERROR_CHECK(i2c_master_bus_add_device(bus_handle, &dev_cfg, &dev_handle));

    while (1)
    {
        // 读取温湿度
        float temperature = 0;
        float humidity = 0;
        temperature = read_temperature();
        humidity = read_humidity();
        printf("温度: %.2f C\n", temperature);
        printf("湿度: %.2f %%\n", humidity);

        vTaskDelay(pdMS_TO_TICKS(1000)); // 等待1秒
    }
}
HTU21D 温湿度传感器 ​

ESP32-C3 版本 ​

HTU21D 温湿度传感器

ESP32-C3 版本
