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Member Since 08 May 2011
Offline Last Active Jul 07 2012 01:19 AM

Posts I've Made

In Topic: Need Quality RS485 Shield or Pull up pull down from code

07 July 2012 - 01:19 AM

Hi Paul - Thanks. I tried sticking some biasing resistors inline on TX and RX, I tried a few different values and they seemed to have the effect of diminishing the number of bytes that are received. Transmit still works. So it's always receive that does not work. Perhaps I will try more biasing resistor values until I arrive at a value which performs. To me, there must a be shield out there properly designed to perform to spec.

In Topic: DFRobot I/O Expansion Shield V5 XBee tips?

11 June 2012 - 05:48 PM

This is the device Wiki:

The DFRobot Sample Code below references pulling the pins high and low which is lower level and I assume the .Net MF handles that with the com port.

We run the same code with this shield with no problems. Using any of Com1, Com2 or Com3 will not make the DFRobot RS485 work. http://www.cutedigi....or-arduino.html
int ledPin = 13;
int EN = 2;
int val;
void setup() 
pinMode(ledPin, OUTPUT);
pinMode(EN, OUTPUT);
void loop()
// receive data
digitalWrite(EN, LOW);//Enable Receiving Data
val =;
if (-1 != val) {
if ('A' == val) {
digitalWrite(ledPin, HIGH);
digitalWrite(ledPin, LOW);

In Topic: DFRobot I/O Expansion Shield V5 XBee tips?

11 June 2012 - 02:28 PM

I am revisiting this RS485/XBee expansion shield. It's the same as this one: http://www.cutedigi....with-rs485.html I still can't get the right jumper settings to make RS485 work. I see per the diagram at pic above that you jump the three pins to activate RS485. It doesn't appear any other jumpers are necessary. Am I wrong? Any insights anyone? Thanks in advance.

In Topic: Power Pins

30 May 2012 - 02:19 AM

I have a related question. I have two Netduini + units that will be deployed together side by side. Is it viable to only run 9VDC power to one, then power the second one by connecting the 5V power pin out to the other? Even if this were viable, I would wonder if this risks overheating the voltage regulator of the first unit. Or perhaps it is just best to power through the jack and voltage regulator in all cases? Thanks in advance.

In Topic: SslStream.AuthenticateAsClient Issue (Microsoft.SPOT.Net.Security class)

23 August 2011 - 09:47 PM

Hi Stefan - Is this still the case with 4.2, no SSL? We had a memory issue doing something else, but once I removed a bunch of references we didn't need we had plenty of memory to spare.

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