Newbe's Questions

[jedeen]

Hi,
I am a complete newbe when it comes to arduino and AM3.3
I have tried to get the example from Ralph (on board led on pin 13) with no success
When I paste the code into my script and run it I get this:

ERROR - [string "logic.lua"]:27: Argument 'hw_id(1)' in function 'hw_led_add' is nil, which is not allowed
ERROR - [string "logic.lua"]:31: Argument 'id(1)' in function 'hw_led_set' is nil, which is not allowed

This is the code:

Code: Select all

my_led = hw_led_add(ARDUINO_MEGA2560_A_D13, 1.0)

function new_data(brightness)
	hw_led_set(my_led, brightness)
end
xpl_dataref_subscribe("sim/cockpit/radios/transponder_brightness", "FLOAT", new_data)	--brightness

When I try to connect a button to the arduino and Am3.3 I get this:

ERROR - [string "logic.lua"]:47: Argument 'hw_id(1)' in function 'hw_button_add' is nil, which is not allowed

This is the code:

Code: Select all

function button_pressed()
  print("button pressed")
end

--function button_released()
  --print("button released")
--end

hw_button_add(ARDUINO_MEGA2560_A_D9, button_pressed)

The arduino is hooked up to AM as shown in the picture below

And now a not newbe question.
Is it not necessary to tell the arduino what is on pin 9 and that pin 9 in for INPUT and that I want to use the on board pull-up

Have fun
Jedeen

[Corjan]

Hey,


Make sure to use quotes ("") for the hw_id.

So try this instead:

Code: Select all

my_led = hw_led_add("ARDUINO_MEGA2560_A_D13", 1.0)

Corjan

[Corjan]

Where did you get the example from? It is wrong there as well.

Corjan

[jedeen]

Sorry Corjan,
I just wanted to delete the post, because I found the mistake. It was completely mine
I found the example here:
https://siminnovations.com/wiki/index.p ... spberry_Pi

But over there is all well to.......AND.......I have learned something.
One has to do nothing in the Arduino environment.

Have fun
Jedeen

[jedeen]

An other question from newbe...
I have setup a simple test rig .....a pushbutton and a led on my mega.
I send a message to AM when the button is pushed down....works fine.
Message in AM is also received.......but why so many times
Button is only pushed once.....I have nothing done to prevent bouncing.
Is this bouncing
See attached screenshot

Have fun
Jedeen

[Corjan]

Could you share your Arduino Sketch?

Corjan

[jedeen]

Sure, but it is very very basic and I know there is also an other way to achieve the same, but I just want to test MessagePort.

This is the arduino part:

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#include <si_message_port.hpp>
#include <si_message_port.h>

// constants
const int buttonPin = 2;     // the number for the pushbutton pin
const int ledPin =  3;      // the number for the LED pin

// variables
int knopStatus = 0;         // variable for reading the pushbutton status

SiMessagePort* messagePort;

static void new_message_callback(uint16_t message_id, struct SiMessagePortPayload* payload) 
{
  // Do something with a message from Air Manager or Air Player

  // The arguments are only valid within this function!
  // Make a clone if you want to store it

  if (payload == NULL) 
  {
    messagePort->DebugMessage(SI_MESSAGE_PORT_LOG_LEVEL_INFO, (String)"Received without payload");
  }
  else 
  {
    switch(payload->type) 
    {
      case SI_MESSAGE_PORT_DATA_TYPE_BYTE:
        messagePort->DebugMessage(SI_MESSAGE_PORT_LOG_LEVEL_INFO, (String)"Received " + payload->len + " bytes: " + payload->data_byte[0]);
        break;
      case SI_MESSAGE_PORT_DATA_TYPE_STRING:
        messagePort->DebugMessage(SI_MESSAGE_PORT_LOG_LEVEL_INFO, (String)"Received string: " + payload->data_string);
        break;
      case SI_MESSAGE_PORT_DATA_TYPE_INTEGER:
        messagePort->DebugMessage(SI_MESSAGE_PORT_LOG_LEVEL_INFO, (String)"Received " + payload->len + " integers" + payload->data_int[0]);
        break;
      case SI_MESSAGE_PORT_DATA_TYPE_FLOAT:
        messagePort->DebugMessage(SI_MESSAGE_PORT_LOG_LEVEL_INFO, (String)"Received " + payload->len + " floats" + payload->data_float[0]);
        break;
    }
  }
}

void setup() 
{
  // Init library on channel A and Arduino type MEGA 2560
  messagePort = new SiMessagePort(SI_MESSAGE_PORT_DEVICE_ARDUINO_MEGA_2560, SI_MESSAGE_PORT_CHANNEL_A, new_message_callback);

  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the pushbutton pin as an input with internal pullup:
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  // Make sure this function is called regularly
  messagePort->Tick();

  // read the state of the pushbutton value:
  knopStatus = digitalRead(buttonPin);

  // check if the pushbutton is pressed.
  if (knopStatus == HIGH) 
  {
    // turn LED off:
    digitalWrite(ledPin, LOW);
  } else 
  {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
    messagePort->SendMessage(777, "hello");
  }
}

And this is the Lua part:

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-- This function will be called when a message is received from the Arduino.
function new_message(id, payload)
  -- Do something with the message from the Arduino
print("received new message with id " .. id .. " and payload saying " .. payload)
end

id = hw_message_port_add("ARDUINO_MEGA2560_A", new_message)

Have fun
Jedeen

[Corjan]

Hi,


Note that the 'loop' function loops So it is continuously being called.

When the pin is LOW, the SendMessage function will also keep being called.
That is why you receive many messages.


I think you should only send a message when the pin state changes,

Corjan

[jedeen]

Good idea....will do that
Thnkx Corjan

Have fun
Jedeen