kohacraft Lab
read from mh-z19 CO2 sensor with LPC1114
Revision 0:963c0badad70, committed 2017-09-27
- Comitter:
- kohacraft
- Date:
- Wed Sep 27 06:51:22 2017 +0000
- Child:
- 1:c7a36fa2c772
- Commit message:
- read from mh-z19 CO2 sensor with LPC1114
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SoftSerial.lib Wed Sep 27 06:51:22 2017 +0000 @@ -0,0 +1,1 @@ +http://os.mbed.com/users/Sissors/code/SoftSerial/#a0029614de72
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Sep 27 06:51:22 2017 +0000
@@ -0,0 +1,42 @@
+#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);
+
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Sep 27 06:51:22 2017 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/f9eeca106725 \ No newline at end of file