我照例程试了下，结果返回是“数据异常 (RAW_T: 0000)”，麻烦您给看下程序是不是有问题>>

include <Arduino.h>

define SCL_PIN 15

define SDA_PIN 14

define CHT8305_ADDR 0x40

// 基础 I2C 信号模拟
void i2c_delay() {
delayMicroseconds(50);
}

void i2c_start() {
pinMode(SDA_PIN, OUTPUT);
digitalWrite(SDA_PIN, HIGH);
digitalWrite(SCL_PIN, HIGH);
i2c_delay();
digitalWrite(SDA_PIN, LOW);
i2c_delay();
digitalWrite(SCL_PIN, LOW);
i2c_delay();
}

void i2c_stop() {
pinMode(SDA_PIN, OUTPUT);
digitalWrite(SDA_PIN, LOW);
i2c_delay();
digitalWrite(SCL_PIN, HIGH);
i2c_delay();
digitalWrite(SDA_PIN, HIGH);
i2c_delay();
}

bool i2c_write(uint8_t byte) {
pinMode(SDA_PIN, OUTPUT);
for (int i = 0; i < 8; i++) {

digitalWrite(SDA_PIN, (byte & 0x80) ? HIGH : LOW);
byte <<= 1;
i2c_delay();
digitalWrite(SCL_PIN, HIGH);
i2c_delay();
digitalWrite(SCL_PIN, LOW);
i2c_delay();

}
pinMode(SDA_PIN, INPUT_PULLUP);
digitalWrite(SCL_PIN, HIGH);
i2c_delay();
bool ack = (digitalRead(SDA_PIN) == LOW);
digitalWrite(SCL_PIN, LOW);
return ack;
}

uint8_t i2c_read(bool ack) {
uint8_t byte = 0;
pinMode(SDA_PIN, INPUT_PULLUP);
for (int i = 0; i < 8; i++) {

digitalWrite(SCL_PIN, HIGH);
i2c_delay();
if (digitalRead(SDA_PIN)) byte |= (0x80 >> i);
digitalWrite(SCL_PIN, LOW);
i2c_delay();

}
pinMode(SDA_PIN, OUTPUT);
digitalWrite(SDA_PIN, ack ? LOW : HIGH);
digitalWrite(SCL_PIN, HIGH);
i2c_delay();
digitalWrite(SCL_PIN, LOW);
return byte;
}

void setup() {
Serial.begin(115200);
// 官方建议：初始化引脚为高电平，稳定总线
pinMode(SCL_PIN, OUTPUT);
pinMode(SDA_PIN, OUTPUT);
digitalWrite(SCL_PIN, HIGH);
digitalWrite(SDA_PIN, HIGH);
delay(1000);
Serial.println("CHT8305C 启动中...");
}

void loop() {
// 1. 触发测量
i2c_start();
if (i2c_write(CHT8305_ADDR << 1)) {

i2c_write(0x00);
i2c_stop();

}

delay(100); // 等待 ADC 转换

// 2. 读取数据
i2c_start();
if (i2c_write((CHT8305_ADDR << 1) | 1)) {

uint16_t t_raw = (i2c_read(true) << 8) | i2c_read(true);
uint16_t h_raw = (i2c_read(true) << 8) | i2c_read(false);
i2c_stop();

if (t_raw != 0 && t_raw != 0xFFFF) {
  float temp = (float)t_raw * 165.0 / 65535.0 - 40.0;
  float hum = (float)h_raw * 100.0 / 65535.0;
  Serial.printf("温度: %.2f C | 湿度: %.2f %%\n", temp, hum);
} else {
  Serial.printf("数据异常 (RAW_T: %04X)\n", t_raw);
}

} else {

i2c_stop();
Serial.println("传感器未响应");

}
delay(2000);
}