Show Posts
Pages: 1 2 [3] 4 5 ... 67
31  Development / Other Software Development / Re: [MOD] Arduino Enhanced Release 1.0.1H for Windows (installer, drivers, etc) +SRC on: October 15, 2012, 12:08:46 pm
Is there a way to move from the beginning to end of a code block (or vice versa) matching braces?
32  Development / Other Software Development / Re: How about to create an IO API (library) for Arduino?! on: September 18, 2012, 12:37:47 am
Can you show some simple examples of code using the library?
33  General Category / General Discussion / Re: ARDUINO C on: September 12, 2012, 03:12:25 am
The arduino language is really c++. I worked my way thru a c/c++ tutorial nook running the examples on the arduino. The biggest things i noticed were the use of setup/loop instead of main and the lack of standard stream i/o on the arduino.
34  Development / Suggestions for the Arduino Project / Re: Interest in overhauling the IDE user interface? on: September 11, 2012, 02:49:32 am
Two things i would like to see:
1) the board and port settings stored kept individually to the ide window and stored with the sketch.
2) a list of recently used sketches on the file menu
Oh, and
3) the hex file kept in the sketch folder.
35  Using Arduino / Interfacing w/ Software on the Computer / Re: USB monitor package to replace simple Arduino serial monitor on: September 10, 2012, 12:59:43 am
Interesting idea. Maybe more like a debugger. The higher-end ides like visual studio do some of this.

I can recommend brey terminal as a more capable monitor but it is still a stream of text.
36  Community / Bar Sport / Re: I think I give up :) on: September 03, 2012, 08:43:13 am
Wow!
37  Community / Bar Sport / Re: Designing connector between two PCBS - similar to SD card on: August 24, 2012, 12:07:39 pm
Could you reduce the number of pins dramatically by using something like spi?
38  Using Arduino / Sensors / Re: One wire RPM pickup on: August 23, 2012, 09:44:45 pm
Post a schematic and the scope trace.  What output do you get from your code and from the mini-tach.
39  Using Arduino / Displays / Re: SparkFun 5110 84x48 LCD supply voltage on: August 20, 2012, 07:25:29 am
I run mine at 3.3 using a small red led to drop the voltage. The current draw is very small so the led's barely visibly lit.
40  Using Arduino / Programming Questions / Re: External Interrupt ISR Execution Latency on: July 23, 2012, 11:39:06 am
There's an excellent writeup linked to by a thread On this site - search for interrupt latency maybe. I believe the basic answer is several microseconds but there are ways to improve it.
41  Using Arduino / Interfacing w/ Software on the Computer / Re: starting the Windows media player from the UNO? on: July 23, 2012, 07:05:56 am
Quote
I still don't quite believe this but the documentation for 1.0 sounds like the pullups are *not* active for pinMode(INPUT).
They are not active by default. They can be activated, using digitalWrite(). Or, the call to digitalWrite() is made for you if you use the type INPUT_PULLUP.

Whew, thanks.

I think that the "disabled" in that sentence refers to the fact that there is now a call to digitalWrite() in the pinMode() function. It is called with HIGH or LOW based on the use of INPUT_PULLUP vs. INPUT.

A peak at the code confirms this. The digitalWrite() function isn't actually called, but the equivalent register manipulations occur.
42  Using Arduino / Interfacing w/ Software on the Computer / Re: starting the Windows media player from the UNO? on: July 22, 2012, 10:49:33 am
Quote
Where can I find info about "Hardware features" like the internal resistor, i guess it is not the only hardware feature on the board?
Start here: http://arduino.cc/en/Main/Hardware
Pick whichever board you have, and read all the details, even if you don't think you will use them (yet).

I still don't quite believe this but the documentation for 1.0 sounds like the pullups are *not* active for pinMode(INPUT). This would break a lot of my http://arduino.cc/en/Reference/PinMode
.
43  Using Arduino / General Electronics / Re: diode isolation - is this ok? on: July 03, 2012, 08:29:27 pm
Actually, just a 1K or 2.2K series-R will probably work.
thanks - i bet it would, certainly my circuit is not much different from a 22k.
44  Using Arduino / General Electronics / diode isolation - is this ok? on: July 03, 2012, 07:22:49 pm


i'm using a parallax ping distance sensor which has a single signal pin.  You pulse it high for 5-15 us then turn and listen for IT to pulse the same line high for a length of time corresponding to the distance.  http://profesores.fi-b.unam.mx/m3615m/datasheet-sen136b5b.pdf

I'm using an mcu with dedicated input and output pins so i can't quite do that.  I'm planning to compensate with the circuit above, sending the pulse out on one pin and reading the response on another.  The trigger output from the MCU is sent high for 15 us then the MCU lowers it to 0.  The resistor pulls the pin down to 0 but the the ping sensor should be able to overcome it and the diode should stop the MCU's 0 from interfering.

This looked ok on the scope except the high pulse from the MCU was down to about 3.3v by the time it got to the sensor - the response pulse looked fine and fat at near 5v.

I thought all was fine til the sensor stopped working.  Trying a spare, it's fine so it looks like I borked the first one.

Does this circuit seem safe?
45  Topics / Product Design / Re: Eagle - My first attempt is ready to go - I hope! on: June 22, 2012, 01:30:48 pm

 Is that a RS232 chip for serial conversion?  If so, usually there are some capacitors involved for it to work properly.

The soic pattern in the bottom left is a spare spot for experimenting. 
Pages: 1 2 [3] 4 5 ... 67