66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
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/*
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*
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* CO2 PASCO2V01 传感器
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*
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*/
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#include <stdio.h>
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#include <wiringPiI2C.h>
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// Pasco2V01 设备地址
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#define DEVICE_ADDRESS 0x76
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// 最大尝试次数
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#define MAX_RETRY 100
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int main() {
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// 初始化 I2C 总线
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int fd = wiringPiI2CSetup(DEVICE_ADDRESS);
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if (fd < 0) {
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printf("Failed to initialize I2C\n");
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return -1;
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}
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// 发送命令开始测量
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int result = wiringPiI2CWrite(fd, 0x00);
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if (result < 0) {
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printf("Failed to write command\n");
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return -1;
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}
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// 等待传感器完成测量
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int retry = 0;
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while (retry < MAX_RETRY) {
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int status = wiringPiI2CReadReg8(fd, 0x00);
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if (status < 0) {
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printf("Failed to read status\n");
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return -1;
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}
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if (status & 0x08) {
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break;
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}
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retry++;
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}
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if (retry >= MAX_RETRY) {
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printf("Measurement timeout\n");
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return -1;
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}
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// 读取测量结果
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unsigned char data[3];
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data[0] = wiringPiI2CReadReg8(fd, 0x02);
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data[1] = wiringPiI2CReadReg8(fd, 0x03);
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data[2] = wiringPiI2CReadReg8(fd, 0x04);
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// 转换为浓度值
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unsigned int concentration = (data[0] << 16) | (data[1] << 8) | data[2];
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// 打印浓度值
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printf("Gas Concentration: %u ppm\n", concentration);
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return 0;
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}
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