APC220 two-way communication

Projects Programming
1

I even checked that I collected data from one Arduino Uno, sent it through one apc220, and collected sensor data from the other apc220. But I want to give commands to Arduino with sensors. But this doesn't work...

This is Arduino Uno code for sending sensor data.


#include <SoftwareSerial.h>
#include "Wire.h"
#include "Adafruit_BMP085.h"


Adafruit_BMP085 bmp;


#define DISABLED_PIN 255


float baselinePressure;


#define DATA_N 13 
unsigned long prevTime = 0; 
const unsigned long interval = 750; 
char cmd = '0';




SoftwareSerial APC(3, 5); // RX and TX
SoftwareSerial IMU(2, DISABLED_PIN); // RX and TX
SoftwareSerial NANO(DISABLED_PIN, 6); // RX and TX
SoftwareSerial TVC_NANO(DISABLED_PIN, 7); // RX and TX
////////////////////////////////////////////////////////////////////
/////////////////////// EBIMU FUNCTION /////////////////////////////
#define SBUF_SIZE 256


//int file_num = 1;
char sbuf[SBUF_SIZE];
signed int sbuf_cnt=0;


int EBimuAsciiParser(float *item, int number_of_item)
{
  int n,i;
  int rbytes;
  char *addr;
  int result = 0;
 
  rbytes = IMU.available();
  for(n=0;n<rbytes;n++)
  {
    sbuf[sbuf_cnt] = IMU.read();
    if(sbuf[sbuf_cnt]==0x0a)
       {
           addr = strtok(sbuf,",");
           for(i=0;i<number_of_item;i++)
           {
              item[i] = atof(addr);
              addr = strtok(NULL,",");
           }


           result = 1;


         // Serial.print("\n\r");
         // for(i=0;i<number_of_item;i++)  {  Serial.print(item[i]);  Serial.print(" "); }
       }
     else if(sbuf[sbuf_cnt]=='*')
       {   sbuf_cnt=-1;
       }


     sbuf_cnt++;
     if(sbuf_cnt>=SBUF_SIZE) sbuf_cnt=0;
  }
 
  return result;
}
/////////////////////// EBIMU FUNCTION /////////////////////////////
////////////////////////////////////////////////////////////////////


void setup()
{
  Serial.begin(9600);
  APC.begin(9600); // start serial to APC
  IMU.begin(9600); // start serial to IMU
  NANO.begin(9600);
  bmp.begin(); // start i2c


  baselinePressure = bmp.readPressure(); 
}


 
void loop()
{
  unsigned long curTime = millis(); 
  float imu_dt[DATA_N];
  String dt = "";
 
  //Safety sequence=======================
 
  if(APC.available()){
    cmd = (char)APC.read();
  }
 


  if(EBimuAsciiParser(imu_dt, DATA_N))
  {
    //myFile = SD.open("data"+String(file_num)+".txt", FILE_WRITE);
 
   
    dt = ("/*"+String(imu_dt[2])+","+String(imu_dt[1])+","+String(imu_dt[0])+\
    ","+String(imu_dt[6])+","+String(imu_dt[7])+","+String(imu_dt[8])+\
    ",5,35.8898,128.6107,"+String(bmp.readAltitude(baselinePressure))+","+cmd+"*/");


    delay(40);
    Serial.println(dt);  
    APC.println(dt);
    if(curTime - prevTime >= interval){
      prevTime = curTime;
      NANO.println(dt);  //nano 
    }
 
  }
 
}

This is the receiving Arduino Uno code.


#include <SoftwareSerial.h>
 
SoftwareSerial APC(3, 4); // RX and TX

void setup()
{
  APC.begin(9600); // start serial to APC
  Serial.begin(9600);
}

void loop()
{


  if(Serial.available()){
    APC.print((char)Serial.read());
  }


  if(APC.available()) {
    Serial.print((char)APC.read());
  }


}

I want to have the receiving side send commands to the sending side, but it doesn't seem to work.

2

How many instances does Software Serial support? Have you checked the documentation?

Which model of Arduino is this running on?

3

It is an Arduino Uno. ah..

4

Thanks for answering one of my questions.

5

4 software serial ports? 2 are often problematic. Did you read the SoftwareSerial reference?

6

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