QuantumPhysGuy

I'm not sure where else to post this, but after talking to a few people I've noticed one of the things that the Netduino SDK lacks is documentation. I think I am going to take on the task of creating XML documentation for all the classes, methods, properties, and events from the Netduino SDK. Once I'm done I'll be able to export the XML documentation as a CHM and HTML documentation for the Netduino SDK/API. Here's hoping everything works out.

I am trying to get a reading from a TMP36 temperature sensor from my Netduino Go. I currently have my breadboard setup where I see the reading from the TMP36 on my multimeter and also have the signal sent to the NGO.

One thing I am noticing right off is the difference from the voltage my multimeter is reading versus the NGO. Currently my multimeter is showing 0.72V coming from the TMP36, but my NGO is showing 0.685v - 0.690v.

Here is my conversion for the ADC:

ShieldBase shieldBase = new ShieldBase(GoSockets.Socket8);
AnalogInput aiTemp = new AnalogInput(shieldBase.AnalogChannels.ANALOG_PIN_A0);
Double dVolts = aiTemp.Read() * (3300 / 1024F);

So you can see when I do the math to convert the volt reading to degrees I am coming up with not so acurate readings. Using the multimeter the temp would be 22° C which is correct for the room I am in, but the NGO shows ~66° C.

Does anyone have any tips on this?

I am trying to get the Parallax Ping))) Sensor working with the Netduino GO and the Shield Base. I am using the Ping class that was created by afulki which can be found here.

Whenever I try to run the code I get an error that states:
An unhandled exception of type 'System.Exception' occurred in GoBusSerialTransport.dll

This is my Program.cs:

        public static void Main()
        {
            ShieldBase shieldbase = new ShieldBase(GoSockets.Socket1);
            Thread.Sleep(5000);
            ParallaxSensors.Ping pPing = new ParallaxSensors.Ping(shieldbase.Pins.GPIO_PIN_D5, 1000, true);

            pPing.RangeEvent += new ParallaxSensors.Ping.RangeTakenDelegate(pPing_RangeEvent);

            Thread.Sleep(Timeout.Infinite);
        }

        public static void pPing_RangeEvent(object sender, ParallaxSensors.PingEventArgs e)
        {
            Debug.Print("Range: " + e.Distance + " cm");
        }

It seems to be failing on line 72 of the code posted by afulki, but I can't figure out why.

_port = new TristatePort(pin, false, false, ResistorModes.Disabled);

This is the stack trace information for the error:

Exception was thrown: System.Exception

GoBus.GoBusSerialTransport::CallFunction
NetduinoGo.ShieldBase::CreateTristatePort
System.Reflection.MethodBase::Invoke
Microsoft.SPOT.Hardware.TristatePort::.ctor
PINGSensor.Program::Main

Does anyone have any ideas?

I'm going to be working on getting communication working with the Parallax Propeller Servo Controller in the next few days, but I think this would be a great add-on as a GO module. The controller allows you to control 16 servos, or 32 with "networked" controllers, with an independent power source for the servos. Not sure if this the proper forum to request a new module but I'm excited about working with this board and seeing a GO module to do the same would fantastic. Parallax Servo Controller Board: http://bit.ly/SCnoMF

I have a parallax standard servo I am trying to get working with the Netduino Go Shield Base. I currently have the servo connected to 5V, GND, and analog 0.

When I turn the netduino on the servo moves just a bit but once I run the below code, nothing happens. Does anyone know why? I'm fairly new at all of this.

The servo says 0.75-2.25 ms high pulse, 20 ms intervals. So I "think" I have the constructor correct on the PWM.

            ShieldBase shieldBase = new ShieldBase(GoSockets.Socket1);
            PWM servo = new PWM(shieldBase.PWMChannels.PWM_0, 20, 18, PWM.ScaleFactor.Milliseconds, false);

            servo.Start();