#include <SoftwareSerial.h>

SoftwareSerial lora(5, 4);

#define TX_PORT 2 // Up to gateway definition #define RX_PORT 1

char dat[64];

void setup() { // put your setup code here, to run once: Serial.begin(9600); lora.begin(115200); delay(1000);

lora.print(“mac join abp”); // Join your ABP delay(5000); }

void loop() { int len = lora.available(); if( len > 0 ) { lora.readBytes(dat, len); for(int x=0; x < len; x++) { Serial.print((char)dat[x]); } }

// put your main code here, to run repeatedly: float sensor_volt; float RS_gas; // Get value of RS in a GAS float ratio; // Get ratio RS_GAS/RS_air int sensorValue = analogRead(A0); float R0 = 2.10;

sensor_volt=(float)sensorValue/1024*5.0; RS_gas = (5.0-sensor_volt)/sensor_volt; // omit *RL

/*-Replace the name “R0” with the value of R0 in the demo of First Test -*/ ratio = RS_gas/R0; // ratio = RS/R0 /*———————————————————————–*/

Serial.print(“sensor_volt = “); Serial.println(sensor_volt); Serial.print(“RS_ratio = “); Serial.println(RS_gas); Serial.print(“Rs/R0 = “); Serial.println(ratio);

Serial.print(“\n\n”);

sprintf(dat, “mac tx ucnf %d %04d”, TX_PORT, sensorValue); lora.print(dat);

delay(30000); }