Hey all I am wondering if my code below can be modified in order for the Arduino to send more than 300 chars to a HM-10 bluetooth 4.0 le module?

#include <SoftwareSerial.h>

SoftwareSerial bluetooth(8,9); // RX, TX
String btString;
String comString;
int isVS;

void setup() {
  // Open serial communications and wait for port to open:
  while (!Serial) {;}

  Serial.println("PC Side Connected");

  while (!bluetooth) {;}

  bluetooth.println("Bluetooth Side Connected");

void loop() { 
  if (Serial.available() > 0) {
    //The IDE Sends and the phone receives
    comString = Serial.readString();

    //Check to see if this request is coming from Visual Studio
    isVS = comString.indexOf("_VS");

    if (isVS > -1) {
      //Is coming from Visual Studio so display it over serial port      
    } else {
      //Not coming from VS so send it to the bluetooth phone

  if (bluetooth.available() > 0) {
    //The phone sends and the IDE receives
    btString = bluetooth.readStringUntil('\n');

As in my code above, I've already tried to add the #define SERIAL_BUFFER_SIZE 512 to the top to give the software serial more buffers but that does not allow me to send more than ~310 chars.

So sending this string:

{MAC:'00-14-22-01-23-45',settings:{rgb:true,quotes:true,sleep:false,timeFrame:{on:'05:30:00',off:'22:30:00'},reset:false,weatherZip:'57104',userInfo:{left:'John Rambo',right:'T100'}},wifiInfo:{Name:'ItBurnsWhenIP',Pwd:'AwHk6gKnsMdxw3boWWAhus5NNCV304YQb/2287QqzH0WnS5W59vCzzW2pR8kgHI79hAUglQOCcBiEKiNWRBQ3oyvyJ0/fDfM1aKa9gfoy3kGHA=='}}

works just fine but if i send out a little more information:

{MAC:'00-14-22-01-23-45',settings:{rgb:true,quotes:true,sleep:false,timeFrame:{on:'05:30:00',off:'22:30:00'},reset:false,weatherZip:'57104',userInfo:{left:'JohnRambo',right:'T100'}},wifiInfo:{Name:'ItBurnsWhenIP',Pwd:'AwHk6gKnsMdxw3boWWAhus5NNCV304YQb/2287QqzH0WnS5W59vCzzW2pR8kgHI79hAUglQOCcBiEKiNWRBQ3oyvyJ0/fDfM1aKa9gfoy3kGHA==','testing out some more strings'}}

It shows everything but the gs'}} at the end on the iphone.

How would i go about fixing this so i can send much more than this?



Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.