JINXIN WEI
/
mh-z14_CO2sensor
sef
Fork of kc_mh-z19_CO2sensor by
main.cpp
- Committer:
- kohacraft
- Date:
- 2017-09-27
- Revision:
- 0:963c0badad70
- Child:
- 1:c7a36fa2c772
File content as of revision 0:963c0badad70:
#include "mbed.h" #include "SoftSerial.h" SoftSerial softSerial(dp18,dp17); //Tx,Rx Serial pc(USBTX, USBRX); //Tx,Rx int main() { softSerial.baud(9600); //to mbed cat pc.baud(9600); // to mh-z19 CO2 sensor char command[] = { 0xff , 0x01 , 0x86 , 0 , 0 , 0 , 0 , 0 , 0x79 }; //command of Read CO2 concentration char responds[9]; unsigned char c; if( pc.readable() ) // throw received data away responds[0] = pc.getc( ); while(1) { //send command for( int i=0 ; i<9 ; i++ ) { while( pc.writeable() == 0 ); pc.putc( command[i] ); } //receve responds c=0; //calc check sum softSerial.printf(" responds:"); for( int i=0 ; i<9 ; i++ ) { responds[i] = pc.getc( ); softSerial.printf("%x ",responds[i]); c += responds[i]; } c -= responds[8]; c = ( 0xff - c ); softSerial.printf(" csm:%x CO2:%dppm temp:%dC stat:%d\r" , c , responds[2]*256 + responds[3] , responds[4]-40 , responds[5]); wait(1); } }