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Topic: Help with converting Byte to Int (Read 752 times) previous topic - next topic


Apr 02, 2012, 01:48 am Last Edit: Apr 02, 2012, 01:55 am by Nick Gammon Reason: 1
Ok so I have two arduino's setup with Xbees. One is sending to the other like this:
Code: [Select]

char buffer[128]
char buffer1[128]
char buffer2[128] //The function requires that they are char[]

if(Canbus.ecu_req(ENGINE_COOLANT_TEMP,buffer1) == 1)
if(Canbus.ecu_req(ENGINE_RPM,buffer2) == 1) //this stores the values in buffer1 and buffer2

sprintf(buffer,"%d%,d%,d%,%d;) // when i print

On my receiving arduino i figured out how to convert this into the integer value, however i can only manage to do this with the first number and then once it detects a comma it ignores the rest because of the atoi function:

int serReadInt()
int i, serAva;                           // i is a counter, serAva hold number of serial available
char inputBytes [7];                 // Array hold input bytes
char * inputBytesPtr = &inputBytes[0];  // Pointer to the first element of the array
if (Serial.available()>0)            // Check to see if there are any serial input
  delay(5);                              // Delay for terminal to finish transmitted
                                             // 5mS work great for 9600 baud (increase this number for slower baud)
  serAva = Serial.available();  // Read number of input bytes
  for (i=0; i<serAva; i++)       // Load input bytes into array
    inputBytes[i] = Serial.read();
  inputBytes[i] =  '\0';             // Put NULL character at the end
  return atoi(inputBytesPtr);    // Call atoi function and return result
  return -1;                           // Return -1 if there is no input

Is there any way that I can take the buffer string and take each number separated by comma out individually?

Moderator edit: [code] ... [/code] tags added. (Nick Gammon)


Apr 02, 2012, 02:41 am Last Edit: Apr 02, 2012, 03:56 am by zoomkat Reason: 1
Is there any way that I can take the buffer string and take each number separated by comma out individually?

One simple idea when capturing from the serial port:

Code: [Select]
//zoomkat 3-5-12 simple delimited ',' string parce
//from serial port input (via serial monitor)
//and print result out serial port
// CR/LF could also be a delimiter

String readString;

void setup() {
  Serial.println("serial delimit test 1.0"); // so I can keep track of what is loaded

void loop() {

  //expect a string like wer,qwe rty,123 456,hyre kjhg,
  //or like hello world,who are you?,bye!,
  if (Serial.available())  {
    char c = Serial.read();  //gets one byte from serial buffer
    if (c == ',') {
      //do stuff
      Serial.println(readString); //prints string to serial port out
      readString=""; //clears variable for new input     
    else {     
      readString += c; //makes the string readString
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