Hello I need some help this is my first time using the .NET Gadgeteer framework and I am using it with a Fez Cerberus microcontroller. The intent of my project is to playback edison wax cylinder records with lasers. For this I am currently trying to use the cerberus to turn the individual circuits on and off when a push button module is pressed. i would like to use a push button module as a toggle switch for turning on my amplifier, detector, and laser driver circuits either simultaneously or one after another which ever proves better. therefore i simply need help with getting the boards code correct for creating digital outputs on three of the pins on a breakout module similar to the extender module. I would then be using these digital outputs to activate transistors or relays to turn on the individual circuits but keep them isolated from the cerberus. I have created the code already but although there are no errors according to Microsoft visual the code still throws this error when it is run.
this happens only once the ssbutton has been pushed
“A first chance exception of type ‘Gadgeteer.Socket.InvalidSocketException’ occurred in Gadgeteer.dll
Error invoking method “Gadgeteer.Interfaces.InterruptInput” (check arguments to Program.BeginInvoke are correct)”
Again I am aware of the fact i could simply use a plain toggle switch or three to do this job. However I would like to do it this way because it should not be very complicated but particularly because it will introduce me to how i can use a microcontroller to accomplish these tasks. Also i could then expand my project later so that it is remote controlled, or perhaps uses timers in the code or additional sensors on the phonograph to provide automatic start and stop capabilities.
Furthermore I have decided to use the cerberus as a way to control the volume I plan to use two pushbutton modules as momentary switches, one for volume increase and the other to decrease it.
For this the cerberus could use as many additional pins on the breakout board as are necessary, probably two or three. However I have two full breakout boards so the number of pins isn’t really a big concern.
The cerberus would be expected to either run a servo motor backwards or forwards to turn the volume up or down respectively in order to turn a potentiometer and change the level. however I have looked at the example code for analog input and output and was thinking the cerberus could also be directly used to scale the voltage. perhaps with the setlinearscale code?however this would probably pose the same speed issue mentioned in another topic of mine in that the .NET Gadgeteer framework wouldn’t be fast enough to allow the board to sample at 40kHz already mentioned therefore the motor would be fine too. Also when doing this I would like to be able to control the speed of the servo.
I have seen the following videos on youtube so I don’t think controlling the servo would be hard but i still need help with the code:
obviously i would want the servo to run at a steady speed but be able to change that speed with the program. furthermore i want to run it by using one of the two push-button modules pushing one would drive the servo forward. Then pushing the other button would run it backwards. Finally it would only run while the buttons are held down.
If there needs to be additional circuitry to accomplish these tasks please let me know what it would be.
Like I said this may seem to be overcomplicating something simple because i could just use basic switches and a potentiometer. However the point is to introduce myself to mechatronic control systems and embedded coding. therefore i need help with creating some basic digital outputs and driving the motor/changing volume based on pushbutton inputs. Then if I later want to I can expand on this by making it remote controlled or based on other sensors such as motion. Thank you again also here is the code i have
using Microsoft.SPOT;
using System;
using System.Collections;
using System.Threading;
using Microsoft.SPOT.Presentation;
using Microsoft.SPOT.Presentation.Controls;
using Microsoft.SPOT.Presentation.Media;
using Microsoft.SPOT.Touch;
using Gadgeteer.Networking;
using GT = Gadgeteer;
using GTM = Gadgeteer.Modules;
using Gadgeteer.Modules.GHIElectronics;
using Gadgeteer.Interfaces;
namespace PhonographReader
{
public partial class Program : Gadgeteer.Program
{
void ProgramStarted()
{
//create boolean for if start stop pushbutton is pressed
bool SSPressed = SSbutton.IsPressed;
SSbutton.TurnLEDOff();//turn off led on SSButton
VolumeUp.TurnLEDOff();//turn off led on Volume Up Button
VolumeDown.TurnLEDOff();//turn off led on Volume down Button
SSbutton.TurnLEDOff();
VolumeUp.TurnLEDOff();
VolumeDown.TurnLEDOff();
Mainboard.SetDebugLED(true);
SSbutton.ButtonPressed += new Button.ButtonEventHandler(SSbutton_ButtonPressed);
VolumeDown.ButtonPressed += new Button.ButtonEventHandler(VolumeDown_ButtonPressed);
VolumeDown.ButtonReleased += new Button.ButtonEventHandler(VolumeDown_ButtonReleased);
VolumeUp.ButtonPressed += new Button.ButtonEventHandler(VolumeUp_ButtonPressed);
VolumeUp.ButtonReleased += new Button.ButtonEventHandler(VolumeUp_ButtonReleased);
}
void SSbutton_ButtonPressed(Button sender, Button.ButtonState state)
{
//declare breakout sockets
GT.Socket TrigSocket;
GT.Socket LDSocket;
//when start stop button is pushed toggle led on and off
SSbutton.ToggleLED();
//socket for trigger circuit breakout
TrigSocket = GT.Socket.GetSocket(5, false, TriggerBO, "y");
//socket for laser and detector circuits breakout
LDSocket = GT.Socket.GetSocket(6, false, LaserBO, "y");
//declare digital outputs for trigger circuits
//declare digital output for Laser
DigitalOutput LaserTrig = new DigitalOutput(TrigSocket, GT.Socket.Pin.Three, false, TriggerBO);
//declare digital output for Audio Amplifier
DigitalOutput AmpTrig = new DigitalOutput(TrigSocket, GT.Socket.Pin.Four, false, TriggerBO);
//declare digital output for PhotoDetector
DigitalOutput DetectTrig = new DigitalOutput(TrigSocket, GT.Socket.Pin.Five, false, TriggerBO);
if (SSbutton.IsLedOn == true)//if ssbutton led is on
{
//activate digital outputs
LaserTrig.Write(true); // Turn ON Laser
AmpTrig.Write(true); // Turn ON Audio Amplifier
DetectTrig.Write(true); // Turn ON detector
}
if (SSbutton.IsLedOn == false)//if ssbutton led is off
{
//deactivate digital outputs
AmpTrig.Write(false); // Turn OFF Audio Amplifier
LaserTrig.Write(false); // Turn OFF Laser
DetectTrig.Write(false); // Turn OFF detector
}
}
//call this function when Volume Up button is pressed
void VolumeUp_ButtonPressed(Button sender, Button.ButtonState state)
{
VolumeUp.TurnLEDOn();//when button is pressed toggle led on or off
\\insert code to run servo forwards
}
//call this function once the Volume Up button is released
void VolumeUp_ButtonReleased(Button sender, Button.ButtonState state)
{
VolumeUp.TurnLEDOff();//when button is pressed toggle led on or off
//insert code to stop servo
}
//call this function once the Volume Down button is pressed
void VolumeDown_ButtonPressed(Button sender, Button.ButtonState state)
{
VolumeDown.TurnLEDOn();//when button is pressed toggle led on or off
\\insert code to run servo backwards
}
//call this function once the Volume Down button is released
void VolumeDown_ButtonReleased(Button sender, Button.ButtonState state)
{
VolumeDown.TurnLEDOff();//when button is pressed toggle led on or off
//insert code to stop servo
}
}
}
and here is the current generated code
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by the Gadgeteer Designer.
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
using Gadgeteer;
using GTM = Gadgeteer.Modules;
namespace PhonographReader
{
public partial class Program : Gadgeteer.Program
{
// GTM.Module definitions
Gadgeteer.Modules.GHIElectronics.Breakout LaserBO;
Gadgeteer.Modules.GHIElectronics.Button SSbutton;
Gadgeteer.Modules.GHIElectronics.UsbClientSP usbClientSP;
Gadgeteer.Modules.GHIElectronics.Button VolumeUp;
Gadgeteer.Modules.GHIElectronics.Button VolumeDown;
Gadgeteer.Modules.GHIElectronics.Breakout TriggerBO;
public static void Main()
{
//Important to initialize the Mainboard first
Mainboard = new GHIElectronics.Gadgeteer.FEZCerberus();
Program program = new Program();
program.InitializeModules();
program.ProgramStarted();
program.Run(); // Starts Dispatcher
}
private void InitializeModules()
{
// Initialize GTM.Modules and event handlers here.
VolumeDown = new GTM.GHIElectronics.Button(2);
SSbutton = new GTM.GHIElectronics.Button(3);
VolumeUp = new GTM.GHIElectronics.Button(4);
LaserBO = new GTM.GHIElectronics.Breakout(5);
TriggerBO = new GTM.GHIElectronics.Breakout(6);
usbClientSP = new GTM.GHIElectronics.UsbClientSP(8);
}
}
}
The trigger breakout would be where the triggering circuits would be connected and I would also like to preferabbly attach the servo to the same breakout.
and finally the display in microsoft studio where I used the graphics to connect the modules (sorry not sure what the right term is.) is attached
THANK YOU again.