Grbl for mega

Hi I've downloaded the grbl zip file from GitHub and followed the instructions to flash it to my arduino mega 2560. When I run grbl controller 3.6.1 I get error, " no data from com port after connect. Expecting gerbil version string " It looks like there's some communication because the led does blink a couple of times after I use " open " but before the error. I only have 1 stepper mother and driver connected to x at the moment but I don't think there's feedback for the arduino to know this, maybe I'm wrong. Any ideas, cheers. Regards, Michael

You need to address your question to a forum that is experienced with GRBL.

What is "grbl controller 3.6.1"

Do you need to do anything to GRBL to let it know it is working on a Mega rather than an Uno ?

...R

Thx for yr reply robin. I ask here because my projects usually have a basis here and I can usually find answers without asking like this, but I admit defeat and so ask. Gerbil controller is a free program that runs on PC and sends , gerbil file format I expect, data to the arduino running grbl to operate CNc, at least thats my understanding of it. Chime in anyone plz if I'm wrong. As far as I can tell there is a device file that includes setup info for my arduino. So I'm lost for ideas, I have used the arduino serial monitor to send grbl commands, $$ and $#, but I didn't receive any reply! lights did flash. Ideas?

The Mega has a different pin mapping than the uno. I have not checked the grbl source but it is possible that it uses PORT commands instead of digitalWrite(). In that case the pin numbers will change

astro_mike: As far as I can tell there is a device file that includes setup info for my arduino.

I suspect @nilton61 is correct.

Can you post the device file?

...R

Please read the sticky thread and post enough detail - we can't reliably guess which version of GRBL you are talking about - you mention github but don't give the actual URL - please provide this information and describe how you built it.

Quickly though - you are using the correct baud rate?

Was this ever solved? I find myself in the exact same situation! Iduino Mega2560 GrblController 3.6 If I upload a simple test program “NOT GRBL” but an arduino program. I get proper movement. but when I flash it with grbl v0.9j I get the same error message

no data from com port after connect. Expecting gerbil version string

So any help? Oh this is the test program

#define X_STEP_PIN         54
#define X_DIR_PIN          55
#define X_ENABLE_PIN       38
#define X_MIN_PIN           3
#define X_MAX_PIN           2

#define Y_STEP_PIN         60
#define Y_DIR_PIN          61
#define Y_ENABLE_PIN       56
#define Y_MIN_PIN          14
#define Y_MAX_PIN          15

#define Z_STEP_PIN         46
#define Z_DIR_PIN          48
#define Z_ENABLE_PIN       62
#define Z_MIN_PIN          18
#define Z_MAX_PIN          19

#define E_STEP_PIN         26
#define E_DIR_PIN          28
#define E_ENABLE_PIN       24

#define Q_STEP_PIN         36
#define Q_DIR_PIN          34
#define Q_ENABLE_PIN       30

#define SDPOWER            -1
#define SDSS               53
#define LED_PIN            13

#define FAN_PIN            9

#define PS_ON_PIN          12
#define KILL_PIN           -1

#define HEATER_0_PIN       10
#define HEATER_1_PIN       8
#define TEMP_0_PIN          13   // ANALOG NUMBERING
#define TEMP_1_PIN          14   // ANALOG NUMBERING

void setup() {
  pinMode(FAN_PIN , OUTPUT);
  pinMode(HEATER_0_PIN , OUTPUT);
  pinMode(HEATER_1_PIN , OUTPUT);
  pinMode(LED_PIN  , OUTPUT);
  
  pinMode(X_STEP_PIN  , OUTPUT);
  pinMode(X_DIR_PIN    , OUTPUT);
  pinMode(X_ENABLE_PIN    , OUTPUT);
  
  pinMode(Y_STEP_PIN  , OUTPUT);
  pinMode(Y_DIR_PIN    , OUTPUT);
  pinMode(Y_ENABLE_PIN    , OUTPUT);
  
  pinMode(Z_STEP_PIN  , OUTPUT);
  pinMode(Z_DIR_PIN    , OUTPUT);
  pinMode(Z_ENABLE_PIN    , OUTPUT);
  
  pinMode(E_STEP_PIN  , OUTPUT);
  pinMode(E_DIR_PIN    , OUTPUT);
  pinMode(E_ENABLE_PIN    , OUTPUT);
  
  pinMode(Q_STEP_PIN  , OUTPUT);
  pinMode(Q_DIR_PIN    , OUTPUT);
  pinMode(Q_ENABLE_PIN    , OUTPUT);
  
   digitalWrite(X_ENABLE_PIN    , LOW);
    digitalWrite(Y_ENABLE_PIN    , LOW);
    digitalWrite(Z_ENABLE_PIN    , LOW);
    digitalWrite(E_ENABLE_PIN    , LOW);
    digitalWrite(Q_ENABLE_PIN    , LOW);
}


void loop () {
  
  if (millis() %1000 <500) 
    digitalWrite(LED_PIN, HIGH);
  else
   digitalWrite(LED_PIN, LOW);
  
  if (millis() %1000 <300) {
    digitalWrite(HEATER_0_PIN, HIGH);
    digitalWrite(HEATER_1_PIN, LOW);
    digitalWrite(FAN_PIN, LOW);
  } else if (millis() %1000 <600) {
    digitalWrite(HEATER_0_PIN, LOW);
    digitalWrite(HEATER_1_PIN, HIGH);
    digitalWrite(FAN_PIN, LOW);
  } else  {
    digitalWrite(HEATER_0_PIN, LOW);
    digitalWrite(HEATER_1_PIN, LOW);
    digitalWrite(FAN_PIN, HIGH);
  }
  
  if (millis() %10000 <5000) {
    digitalWrite(X_DIR_PIN    , HIGH);
    digitalWrite(Y_DIR_PIN    , HIGH);
    digitalWrite(Z_DIR_PIN    , HIGH);
    digitalWrite(E_DIR_PIN    , HIGH);
    digitalWrite(Q_DIR_PIN    , HIGH);
  }
  else {
    digitalWrite(X_DIR_PIN    , LOW);
    digitalWrite(Y_DIR_PIN    , LOW);
    digitalWrite(Z_DIR_PIN    , LOW);
    digitalWrite(E_DIR_PIN    , LOW);
    digitalWrite(Q_DIR_PIN    , LOW);
  }
  
  
    digitalWrite(X_STEP_PIN    , HIGH);
    digitalWrite(Y_STEP_PIN    , HIGH);
    digitalWrite(Z_STEP_PIN    , HIGH);
    digitalWrite(E_STEP_PIN    , HIGH);
    digitalWrite(Q_STEP_PIN    , HIGH); 
  delay(2.5);
    
    digitalWrite(X_STEP_PIN    , LOW);
    digitalWrite(Y_STEP_PIN    , LOW);
    digitalWrite(Z_STEP_PIN    , LOW);
    digitalWrite(E_STEP_PIN    , LOW);
    digitalWrite(Q_STEP_PIN    , LOW); 
  
}