CRIO ARDUINO INTERFACE

[Robototes2412]

Hey, i got bored and wrote this:

package com.shadowh511.mayor.utils;

import edu.wpi.first.wpilibj.SerialPort;

/**
 *
 * @author Team 2412
 */
public class Arduino {
    /*
     * Hopefully, i will be able to have an arduino be hooked up to the robot
     * and communicate with the serial port.  I can use this to do many things,
     * such as maintain a LCD screen and display data on it to help the electrical
     * and mechanical teams figure out what went wrong.
     *
     * In all realism, it will most likely just be a fun cool thing for me to
     * play with :D
     */
    private SerialPort serial;

    public Arduino() {
        try {
            serial = new SerialPort(115200);
            this.serial.disableTermination();
            this.serial.print("h");
            System.out.println("Arduino Starting, waiting 0.5 seconds to get data");
            String e = this.getData();
            edu.wpi.first.wpilibj.Timer.delay(0.125);

            if(e.equals("h")) {
                System.out.println("Arduino communications locked in");
            }
        }
        catch (Exception e) {
            System.out.println("something went wrong, " + e.getMessage());
        }
    }

    public String getData() {
        try {
            return this.serial.readString();
        } catch (Exception e) {
            System.out.println("something went wrong, " + e.getMessage());
            return null;
        }
    }

    public boolean sendData(byte[] buffer) throws Exception {
        try {
            int count = buffer.length;
            this.serial.write(buffer, count);
            return true;
        } catch (Exception e) {
            System.out.println("something went wrong, " + e.getMessage());
            return false;
        }
    }
    
    public boolean printf(String data) {
        try {
            this.serial.print(data);
            return true;
        } catch (Exception e) {
            System.out.println("something went wrong, " + e.getMessage());
            return false;
        }
    }

    public String requestData() {
        try {
            this.serial.print("r");
            return this.serial.readString();
        } catch (Exception e) {
            System.out.println("something went wrong, " + e.getMessage());
            return null;
        }
    }

    public int requestData(String request) {
        try {
            this.serial.print(request);
            return NumberUtils.stringToInt(this.getData());
        } catch (Exception e) {
            System.out.println("something went wrong, " + e.getMessage());
            return 0;
        }
    }
}

Hook up an arduino to the serial port and have it run a program that toggles pin number 13. Bind a button to sending h and a button to sending l. have fun pushing the buttons, you just made a polyglot robot!

[Jeremy Germita]

I like the whole idea of this!

I had an idea like this in march, but it was far more complex.

Can I play around with it? I'd like to possibly help improve on this.

[Robototes2412]

all my code is gpl'd so go at it. It doesn't reliably work ATM, so can you help me fix it please?

[Jeremy Germita]

I'll be glad to help. I can do some testing in starting in July.
Maybe we can have a working version by the 2011 Build Season!

What seems to be the problem?

Just a thought... Does your team use CAN? If yes, I think that this could interfere with that. Maybe have an alternate mode using the ADC and the DIO. Using 2 12 bit channels of the ADC, we can have a simple protocol to convert the returned int(or is it double?) into a char.

[Robototes2412]

This goes directly through the serial port on the Robot.

I am working on a bit of Arduino code that will let me see if the serial port is being used for anything.

I think the following will work:

void setup() {
  Serial.begin(/*Maximum Serial Rate*/);
}

void loop() {
  Serial.println(Serial.read());
}

Assuming you have your arduino hooked up to your laptop and the robot's serial port hooked up to the arduino with the TX to RX and the ground, or Pins 2 and 5.

[Jeremy Germita]

That sounds like a good idea. Ill post some code of the alternate comms when I get the chance.

[Jeremy Germita]

here is a rough idea of the constructor

public void robotInit() {
  Arduino arduinoEx = new Arduino(CommsMode commsMode,int inChannel, int outChannel);
  Arduino arduinoAn = new Arduino(CommsMode.kAnalog, 1);    //Analog, channel 1
  Arduino arduinoDig = new Arduino(CommsMode.kDigital, 7, 8);  //Digital, Channels 7 and 8
  Arduino arduinoSer = new Arduino(CommsMode.kSerial, baudRate);  //Serial, baudRate
  Arduino arduinoI2C = new Arduino(CommsMode.kI2C, 1);
}

ControlMode - Analog(with a digital Pot), Digital(with the DIO pins of the crio and arduino), Serial, I2C, etc

int inChannel - Digital-the recieving pin
Analog-The input pin
Serial-Not Needed
I2C-The address on the bus

int OutChannel-Digital only- the sending pin

long BaudRate - Serial Only, self explanatory

I'll write something up in the library to show you how the constructors would work

[Jeremy Germita]

About the unreliability, could you please explain this?
Is it timing? Maybe we can do something like a signal set HIGH to indicate
an incomming serial transmission and vice versa for the cRio.

I'm not sure about the levels of the Serial port on the cRio, but maybe the
levels are different. A solution to this could be using the MAX233 level
converter IC.

How is the 'duino powered? Maybe your USB port has some problem. How
about make a power adaptor(PD-Board to 3.5mm Barrel Jack). And maybe a
filter cap to smooth out any signal problems caused by rapidly dropping
voltage due to a motor starting up or similar. The regulator on the arduino
can handle the 12 volts as long you aren't powering a current-hog(servos,
lot's of led's, etc). If you are using the LCD as you said, maybe that is
drawing abnormally large amounts of current(just a thought)

Also, can we move this to PM's or email? Perferably email. PM me if yes

[michael714]

Don't move to PM's. Other people want to add an Arduino interface to the cRio. Like me. Thanks!

[Tanner]

Originally Posted by michael714

Don't move to PM's. Other people want to add an Arduino interface to the cRio. Like me. Thanks!

Ditto.

-Tanner

[Robototes2412]

Well, our pm convo isn't alive anymore.

As far as the interface goes, I need people to help me test it (no changes since release 0)

can someone also post a copy of the serial output of the cRIO booting? (I have no serial port )