microbit_read_gas_sensor.c

#include "MicroBit.h"
#include "MicroBitDisplay.h"

MicroBitSerial serial(MICROBIT_PIN_P14, MICROBIT_PIN_P15);

MicroBitDisplay display;

const char commandbytes[] =  {0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x79};

ManagedString command(commandbytes, 9);
//ManagedString((((uint16_t)highppm) * 256) + lowppm)

int main()
{
    serial.baud(9600);
    while(1){
        serial.send(command);
        ManagedString response = serial.read(9);
        char header = response.charAt(1);
        char highppm = response.charAt(2);
        char lowppm = response.charAt(3);
        if(header == 0x86){
            display.scroll(ManagedString("D"));
        }
        else{
            display.scroll(ManagedString("?"));
        }
    }
}