bill.french's Content
There have been 260 items by bill.french (Search limited from 09-July 24)
#6328 Eastern U.S Lunar Eclipse
Posted by
on 21 December 2010 - 05:05 PM
in
General Discussion
oh, i'm so sorry!
#6322 Eastern U.S Lunar Eclipse
Posted by
on 21 December 2010 - 01:02 PM
in
General Discussion
So, did you see it? Take pics? I have always found lunar eclipses don't live up to the hype, but they are interesting.
#8170 LEDs for netduino
Posted by
on 23 January 2011 - 02:39 PM
in
General Discussion
You can use a plain old NPN transistor, which is fun to use if you want to learn about transistors, anyway. I've used various leds with 220ohm resistors on various ports without and problem so far for testing, but your mileage may vary!
I'd like to find a source for leds with resistors built in.
#7274 Introduction
Posted by
on 08 January 2011 - 02:46 PM
in
General Discussion
Can anyone recommend a vendor for sensors?
Welcome!! What kind of sensors???
http://www.sparkfun.com/categories/23 is my favorite place to start.
#8750 2 Potentiometers = Freeze-ups
Posted by
on 31 January 2011 - 01:37 PM
in
General Discussion
Post the code when you get a chance.
#7636 Question about COM2
Posted by
on 14 January 2011 - 06:05 AM
in
Netduino 2 (and Netduino 1)
Staring at Tecchie's Pinout Cards tonight, a question popped in my head:
If you are using COM2, are D7 and D8 (rts/cts) unusable for anything else? Or can the still be assigned as input/output ports?
If you are using COM2, are D7 and D8 (rts/cts) unusable for anything else? Or can the still be assigned as input/output ports?
#5165 Disposability
Posted by
on 22 November 2010 - 03:43 AM
in
Netduino 2 (and Netduino 1)
This is how I started learning about it:
http://forums.netdui...ch__1#entry4293
#8692 Switching AC
Posted by
on 30 January 2011 - 02:33 PM
in
General Discussion
I'm using this for my sous vide controller: (i use a transistor to control it from the netduino)
http://powerswitchta...om/default.aspx
I had a 16hr steak and eggs for breakfast!
What are you working on?
http://powerswitchta...om/default.aspx
I had a 16hr steak and eggs for breakfast!
What are you working on?
#7022 Newbie on Serialport
Posted by
on 04 January 2011 - 11:39 PM
in
Netduino 2 (and Netduino 1)
Here's another of my threads with a circuit diagram including the phanderson chip:
http://forums.netdui...rst-shield-pcb/
#5786 Serial Communication via D0 and D1
Posted by
on 05 December 2010 - 10:58 PM
in
Netduino 2 (and Netduino 1)
I'm trying to get this onewire to rs232 device working, and of course it's not...
For serial, using D0 for RX (hooked to TX on my device) and D1 as TX (hooked to RX on my device), do I need anything other than:
... and then I can read and write using s1.Read and s1.Write?
What does .Read do if there's no data there? Does it just wait? Return garbage?
I'm getting data via s1.Read with nothing even hooked up to the netduino.
For serial, using D0 for RX (hooked to TX on my device) and D1 as TX (hooked to RX on my device), do I need anything other than:
var s1 = new SerialPort(SerialPorts.COM1, 9600); s1.Open()
... and then I can read and write using s1.Read and s1.Write?
What does .Read do if there's no data there? Does it just wait? Return garbage?
I'm getting data via s1.Read with nothing even hooked up to the netduino.
#5794 Serial Communication via D0 and D1
Posted by
on 06 December 2010 - 02:50 AM
in
Netduino 2 (and Netduino 1)
OK I figured it out... I was receiving 4x more bytes than expected because the onewire->rs232 works in a completely unexpected way. Even once I disconnected the device, the uart still had data in it.
So, when I ask it to read a byte, it returns the byte represented in hex using ascii characters...
So, if I was expecting just this byte: 11111111 (in binary) (255 in decimal) (FF in hex)
it actually sends the ascii character F twice followed by linefeed and carriage return, for a total of four bytes.
#7932 About the forum (hard to read this theme)
Posted by
on 19 January 2011 - 08:26 PM
in
General Discussion
You could vote, here:
http://forums.netdui...ch__1#entry3998
#4111 Questions about time
Posted by
on 22 October 2010 - 05:11 PM
in
Netduino 2 (and Netduino 1)
Cool. Is your stopwatch sample still applicable? It uses Microsoft.SPOT.Hardware.Utility.GetMachineTime().
#4107 Questions about time
Posted by
on 22 October 2010 - 04:27 PM
in
Netduino 2 (and Netduino 1)
I've read these two threads:
http://forums.netdui...rch__1#entry514
http://forums.netdui...rch__1#entry650
My basic question is: what does the netduino know about time, and how can I access it? I (think I) know there's no RTC (real time clock), but there is a RTT (real time timer) which is fine, but what ways to get access to accurate time? Can events be raised by timers?
Most of the samples I've seen deal with timing through thread.sleep.
#5986 AnalogInput hardware error
Posted by
on 11 December 2010 - 03:52 AM
in
General Discussion
This worked for me -- note the .Dispose() towards the end; the "using" i suggested earlier might not work because of AnalogInput not being IDisposable
public static double ReadLM34(Cpu.Pin inputPin)
{
// Reads an LM34 analog temperature sensor several times and converts the
// Code example for potentiometer at:
// http://forums.netduino.com/index.php?/topic/638-basic-analog-input-circuit-and-program/
int vRef = 3300; // 3300 mV, or 3.3V
int readingTot = 0; // Summed total of the iterations
int numReads = 10; // Number of times to take a reading
double tempF = 0.0; //
AnalogInput analogPin = new AnalogInput(inputPin);
// Take a number of readings and average them together to get the final
// temperature calculation
for (int i = 0; i < numReads; i++)
{
readingTot += analogPin.Read();
}
tempF = (readingTot / numReads) / 1024 * vRef / 10;
analogPin.Dispose();
return tempF;
}
#5984 AnalogInput hardware error
Posted by
on 11 December 2010 - 02:11 AM
in
General Discussion
hmm, seems like the analogpin isn't getting released properly, would be my guess? Something to do with ReadLM34 being static?
Maybe try something like this:
instead of:
... but then again analog input might not be idisposable, so this might not help.
I'm about to jump onto my other computer and can try it out myself.
Maybe try something like this:
instead of:
AnalogInput analogPin = new AnalogInput(inputPin);try:
using(AnalogIntput analogPin = new AnalogInput(inputPin))
{
...your other code...
}
... but then again analog input might not be idisposable, so this might not help.
I'm about to jump onto my other computer and can try it out myself.
#5982 AnalogInput hardware error
Posted by
on 11 December 2010 - 01:58 AM
in
General Discussion
Can you post the rest of that code block? If you click break, does it give you a more explicit error?
#4748 want little help
Posted by
on 09 November 2010 - 06:08 PM
in
General Discussion
You could use something like this with the netduino:
http://www.parallax....83/Default.aspx
to sense the motion, which could then alert something to start recording, or raises some other sort of alert.
http://www.parallax....83/Default.aspx
to sense the motion, which could then alert something to start recording, or raises some other sort of alert.
#4788 Netduino power
Posted by
on 10 November 2010 - 03:49 AM
in
General Discussion
Check this out:
http://forums.netdui...ch__1#entry3812
.. i'm thinking 15v should be fine.
#4925 Measuring Analog Value and output it on console?
Posted by
on 15 November 2010 - 12:04 AM
in
General Discussion
This might help you:
http://forums.netdui...it-and-program/
#11580 Trenton Computer Festival this weekend!!!
Posted by
on 02 April 2011 - 01:47 AM
in
General Discussion
Hi there, I haven't been hanging around the forum as much, but have been busy, busy, busy! With Netduino projects and other things.
Anyway, this weekend is the Trenton Computer Festival! (in Trenton, NJ) There's going to be an all-day "Arduino Workshop", which could be of particular interest, including an open hack time, which I'm hoping to bring my Netduino+ to.
Also, the flea market has traditionally had a wider variety of computer stuff, some older stuff, junk, etc. -- as compared to most computer flea markets.
Either way, everyone enjoy your weekend!
Anyway, this weekend is the Trenton Computer Festival! (in Trenton, NJ) There's going to be an all-day "Arduino Workshop", which could be of particular interest, including an open hack time, which I'm hoping to bring my Netduino+ to.
Also, the flea market has traditionally had a wider variety of computer stuff, some older stuff, junk, etc. -- as compared to most computer flea markets.
Either way, everyone enjoy your weekend!
#7905 "Open Collector"
Posted by
on 19 January 2011 - 12:49 PM
in
Netduino 2 (and Netduino 1)
Great, thanks for the feedback. I wasn't sure if with the netduino I could set it to an inputport and get the same open collector effect -- or use some other technique in code that does not require a transistor (and resistor as fred stated!)
Right now I have it hooked up directly to the netduino and it works fine. So....
#7877 "Open Collector"
Posted by
on 19 January 2011 - 12:30 AM
in
Netduino 2 (and Netduino 1)
Form the manual for my uLCD-144: (emphasis mine)
From wikipedia, I feel like I have a good handle on what "open collector" means -- but how do I do that with a netduino?
Master Reset signal. Internally pulled up to 3.3V via a 4.7K resistor. An
active Low pulse greater than 2 micro-seconds will reset the module. If
the module needs to be reset externally, only use open collector type
circuits. This pin is not driven low by any internal conditions. The host
should control this pin via one of its port pins using an open
collector/drain arrangement.
From wikipedia, I feel like I have a good handle on what "open collector" means -- but how do I do that with a netduino?
#5659 Pre-Assembled Kits
Posted by
on 02 December 2010 - 07:26 PM
in
General Discussion
What, as an example, do you want pre-assembled?
#4680 Question regarding listeningSocket.Accept();
Posted by
on 08 November 2010 - 10:25 PM
in
Netduino Plus 2 (and Netduino Plus 1)
Regarding Fred's webserver -- and other things of this sort that use
How do you kill them if you want them to stop listening? They are in their own threads, waiting for connections. How to you tell it to stop accepting connections, and also make the thread to go away?
My question is actually more about how to do this in general, and not specific to the web server, but it is an example of what I'm trying to understand. Thanks!
listeningSocket.Accept();
How do you kill them if you want them to stop listening? They are in their own threads, waiting for connections. How to you tell it to stop accepting connections, and also make the thread to go away?
My question is actually more about how to do this in general, and not specific to the web server, but it is an example of what I'm trying to understand. Thanks!
