co2 sensor garbage characters on serial monitor

[u1080665]

This code works very well. The one posted on the website did not work for me. There must be an error with it. Can you guys look into it?

regeier post_id=27780 time=1539690087 user_id=46452:

@regeier post_id=27780 time=1539690087 user_id=46452

I fixed the code from that post and uploaded it, but still get garbage characters out.

[code]#include <SoftwareSerial.h>
const int pinRx = 9;
const int pinTx = 8;

SoftwareSerial s_serial(pinTx,pinRx);
#define sensor s_serial

unsigned char flg_get = 0; // if get sensor data

const unsigned char cmd_get_sensor =
{
0xff, 0x01, 0x86, 0x00, 0x00,
0x00, 0x00, 0x00, 0x79
};

void setup()
{
Serial.begin(115200);
sensor.begin(9600);
}

bool sendCmdGetDta(int *gas_strength, int *temperature)
{
for(int i=0; i<sizeof(cmd_get_sensor); i++)
{
sensor.write(cmd_get_sensor[i]);
}

long cnt_timeout = 0;
while(!sensor.available()) // wait for data
{
delay(1);
cnt_timeout++;

if(cnt_timeout>1000)return 0; // time out
}

int len = 0;
unsigned char dta[20];

while(sensor.available())
{
dta[len++] = sensor.read();
}

if((9 == len) && (0xff == dta[0]) && (0x86 == dta[1])) // data ok
{
gas_strength = 256dta[2]+dta[3];
*temperature = dta[4] - 40;
return 1;
}
return 0;
}

void loop()
{
flg_get = 0;
int gas, temp;

if(sendCmdGetDta(&gas, &temp)) // get data ok
{
Serial.println("get data ok: ");
Serial.print("gas_strength = “);
Serial.println(gas);
Serial.print(”\ttemperature = ");
Serial.println(temp);
}
else
{
Serial.println(“get data error”);
}
delay(1000);
}

void serialEvent()
{
while (Serial.available())
{
char c = Serial.read();
if(c == ‘g’)flg_get = 1;
}
}[/code]