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1  Using Arduino / Displays / Re: Routine to turn on single pixel on standard 16x2 lcd on: April 08, 2012, 02:25:44 pm
This makes me very sad as I wanted to make a cute little pong game on my cute little 16x2 smiley-sad
2  Using Arduino / Displays / Routine to turn on single pixel on standard 16x2 lcd on: April 08, 2012, 02:19:31 pm
Where can I find a routine that turns on a single pixel on a standard hitachi 16x2 lcd?

something like this drawpixel(row,col)

I'd prefer not wasting time writing this API if its already been done.

Thanks! smiley
3  Using Arduino / Interfacing w/ Software on the Computer / Pure Data MIDI fun :) on: February 26, 2011, 09:31:28 am
I'm trying to remotely control a synthesizer by sending out midi CC values. I used midi cc table to do this.  It supplies at most 127 parameters for each class A, B, and C midi values.
For now I can send parameters with CLASS A midi cc data.  I do this by just using "ctlout #" in Pure Data
However, I need to access CLASS B midi parameters.  What is this? and how do I send this kind of data?

Thanks very much!
4  Forum 2005-2010 (read only) / Troubleshooting / Re: H-Bridge Help on: March 29, 2010, 08:39:43 am
Thanks westfw! You were right!  I tried it with a small servo motor and it worked!

But how would I increase the output current to be suitable for a slightly larger motor??
Maybe to about half an amp..

This is how the resistors are connected:
5  Forum 2005-2010 (read only) / Troubleshooting / H-Bridge Help on: March 28, 2010, 10:12:59 am
Ok I know this isn't arduino related but I thought I might be able to get some help here.

I constructed this four transistor H-bridge on a breadboard.
I used two pnp and two npn transistors. Also four 1K-ohm resistors

I'm certain it is properly built, because I have two leds (in both directions) in place of the motor terminals.

When one input is set high (opposite set low) one led lights up and when the other input is set high (opposite set low), the other led lights up instead.  This tells me it is functioning properly.

However, when I replace the testing leds with a motor it doesn't work!!  Why is this??
The motor I am using is a standard worm drive motor.  I also tried it with a few of my other model airplane motors and nothing works!
What's wrong here??   smiley-sad
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