[Arduino] 二氧化碳传感器 ELT IoT-300E 驱动代码嵌入式SnowyIris的博客-

使用方法、原理都在JavaDoc (ArduinoDoc) 里面了，复制即用:

// IoT300E.h /**  * For ELT Sensor IoT-300E  * @version 1.0  * @since Apr.24th, 2020.  * @author 星雪鸢尾  */ #ifndef __IOT300E__ #define __IOT300E__ #include "Wire.h" namespace IoT300E { /**    * 将IIC通信初始化到主机模式.    */ void InitIIC() {     Wire.begin(); } /**    * Use IIC to get ppm of CO2.    * <p>摘抄自Datasheet:<ul>    *   <li>Internal pull up resister</li>     *   <li>Slave Address: 0x31, Slave Address Byte: Slave Address(0x31) 7 Bit + R/W 1 Bit</li>      *   <li>Transmission Sequence in Master</li><ol>     *     <li>I2C Start Condition</li>     *     <li>Write Command(Slave Address + R/W Bit(0) = 0x62) Transmission and Check Acknowledge</li>     *     <li>Write Command(ASCII ‘R’ : 0x52) Transmission and Check Acknowledge</li>     *     <li>I2C Stop Command</li>     *     <li>I2C Start Command</li>     *     <li>Read Command(Slave Address + R/W Bit(1) = 0x63) Transmission and Check Acknowledge</li>    *     <li>Read 7 Byte Receiving Data from Module and Send Acknowledge (Delay at least 1ms for reading each byte)</li>    *   </ol></ul>    * 以上接收的7个Byte为: 1Byte Configuration({@code 0b00001000}), 2Byte CO2, 4Byte reserved({@code 0x00})    * @return ppm of CO2; {@code -1} Configuration Byte 出错    */ int GetPPMFromIIC() {     Wire.beginTransmission(0x31);     Wire.write('R');     Wire.endTransmission(0); unsigned char recv_iic[7] = {0};     Wire.requestFrom(0x31, 7, 1); for (byte i = 0; i < 7; ++i) if (Wire.available())          recv_iic[i] = Wire.read(); else break; if (recv_iic[0] != 0b1000) return -1; union {unsigned char in[2]; unsigned short out;} temp;     temp.in[0] = recv_iic[2];     temp.in[1] = recv_iic[1]; return temp.out; } /**    * 将给定串口初始化到 {@code 38400} 波特率.    * @param serialNo 串口号    * @return {@code 0} 初始化完成; {@code -2} 串口号错误    */ int InitUART(byte serialNo) { switch (serialNo) { case 0:          Serial.begin(38400); return 0; case 1:          Serial1.begin(38400); return 0; case 2:          Serial2.begin(38400); return 0; default: return -2; } } /**    * Use UART to get ppm of CO2.    * WARNING: 请确认串口存在    * <p>摘抄自Datasheet:<ul>    *   </li>Data Transmit</li><ul>    *     <li>Interval : 3 seconds</li>    *     <li>Handshake protocol : None (Data is transmitted to outer device periodically)</li></ul>     * <li>Data Format</li><ul>    *   <li>D5 D4 D3 D2 D1 BL ‘p’ ‘p’ ‘m’ CR LF</li><ul>    *     <li>D1 ~ D5 = 5 byte CO2 density string</li>     *     <li>BL = Blank: 0x20</li>     *     <li>‘ppm’ = ‘ppm’ string</li>     *     <li>CR = Carriage return : 0x0D</li>     *     <li>LF = Line feed : 0x0A</li></ul></ul></ul>    * @param serialNo 串口号    * @return ppm of CO2; {@code -1} 读取出错,串口可能正在接收数据; {@code -2} 串口号错误    */ int GetPPMFromUART(byte serialNo) { if ((serialNo > 2)|(serialNo < 0)) return -2; unsigned long timeStart;     timeStart = millis(); char recv_uart[11] = {0}; for (byte i = 0; i < 11; ++i) switch (serialNo) { case 0:            recv_uart[i] = Serial.read(); break; case 1:            recv_uart[i] = Serial1.read(); break; case 2:            recv_uart[i] = Serial2.read(); break; default: break; } int ppm = 0; for (byte i = 0; i < 5; ++i) if (recv_uart[i] != 0x20)         ppm = ppm * 10 + (int)(recv_uart[i] - '0'); if (atoi(recv_uart) != ppm) // 玄学校验,反正能用 return -1; return ppm; } } #endif

很多东西第一次接触，还请各位指教.