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Re: Using Tiny AVR programmer with C/C++ and HVSP

 by 60amp_relay ¦  Mon Jun 01, 2015 4:35 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Using Tiny AVR programmer with C/C++ and HVSP ¦  Replies: 2 ¦  Views: 483

If you want to use C programs, you'll probably want to go with something more general-purpose. I use the Adafruit USBTinyISP, and SparkFun has a similar product: https://www.sparkfun.com/products/9825 HVSP is a difficult way to start off - if you are comfortable building your own emitter-follower ci...

Re: Silent motors for robot

 by 60amp_relay ¦  Mon Jun 01, 2015 4:19 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Silent motors for robot ¦  Replies: 5 ¦  Views: 578

The Actobotics/RobotZone precision gearmotors are amazingly quiet. https://www.sparkfun.com/categories/247

Switching Voltage Regulator question

 by 60amp_relay ¦  Sat Sep 04, 2010 5:56 am ¦  Forum: SparkFun Product Questions ¦  Topic: Switching Voltage Regulator question ¦  Replies: 3 ¦  Views: 596

I'm trying to figure out which parts I need to make a switching +5V voltage regulator. Up to this point, I've always used an LM7805 linear regulator, which works great at low currents. But the current draw on my latest project is around 0.8A. The LM7805 generates too much heat in this situation, and...

Re: Power Supply - Can It Be Done ?

 by 60amp_relay ¦  Mon Aug 16, 2010 7:34 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Power Supply - Can It Be Done ? ¦  Replies: 14 ¦  Views: 1399

Just set the adjustable output to +10V, and use the fixed +5V as your ground.

Re: New Project-Automotive. Need a little help

 by 60amp_relay ¦  Mon Aug 16, 2010 7:25 pm ¦  Forum: SparkFun Product Questions ¦  Topic: New Project-Automotive. Need a little help ¦  Replies: 13 ¦  Views: 2226

The Parallax Basic Stamp is an easy way to get started with microcontrollers (which is eventually what you want here) The trouble is I don't know of a direct way to read an analog voltage using the Stamp. I suppose you could use a discrete ADC, like an ADC0831CCN or something similar, but in that ca...

Re: SSR relay question

 by 60amp_relay ¦  Sun Aug 08, 2010 7:23 pm ¦  Forum: SparkFun Product Questions ¦  Topic: SSR relay question ¦  Replies: 4 ¦  Views: 588

I use the Sharp brand of the same thing. You'll need to have an actual AC load on the relay with a zero-crossing in order to measure the output. A multimeter alone won't do it - you need a 60W wall lamp or something similar that's actually drawing some power. Make sure to have a resistor on the cont...

Re: USB Bluetooth on Ubuntu - Issues with Roving Networks BT

 by 60amp_relay ¦  Mon Jul 19, 2010 5:40 pm ¦  Forum: Wireless/RF ¦  Topic: USB Bluetooth on Ubuntu - Issues with Roving Networks BT ¦  Replies: 3 ¦  Views: 2117

Worked like a charm! I was having the same problem under Ubuntu 9.04, and your mini-howto solved the problem for me. Thanks for posting these instructions.

Re: Basic 16x2 Character LCD Project - Compatability Question

 by 60amp_relay ¦  Fri Jul 16, 2010 6:16 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Basic 16x2 Character LCD Project - Compatability Question ¦  Replies: 4 ¦  Views: 1182

At a glance, it looks like it would work. The only problem I see is that the molex connector doesn't seem to have a connection for the LCD backlight. (where are pins #15 and #16?) Other than that, my semi-educated guess is that it would be compatible.

Re: 2nd time in a row...

 by 60amp_relay ¦  Thu Jul 01, 2010 2:57 pm ¦  Forum: BatchPCB ¦  Topic: 2nd time in a row... ¦  Replies: 1 ¦  Views: 1030

My condolences. I feel your pain...literally. I had a similar experience, and apparently others have, too. http://forum.sparkfun.com/viewtopic.php?f=16&t=21870 http://forum.sparkfun.com/viewtopic.php?f=16&t=21261 http://forum.sparkfun.com/viewtopic.php?f=16&t=21654 I'd be curious to know if you're s...

Re: Burning Man project...

 by 60amp_relay ¦  Tue Jun 22, 2010 6:52 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Burning Man project... ¦  Replies: 5 ¦  Views: 879

If you are ok with simply alternating between two colors, or alternating between adjacent groups of LEDs, it's pretty straightforward. A simple astable multivibrator circuit and a few power transistors would do it. The next big jump in complexity would be to use some kind of programmable microcontro...

Re: RF Tx/Rx units - any fault finding advice?

 by 60amp_relay ¦  Mon Jun 21, 2010 7:02 pm ¦  Forum: Wireless/RF ¦  Topic: RF Tx/Rx units - any fault finding advice? ¦  Replies: 17 ¦  Views: 3753

How come you're using +4V to power the receiver? The (admittedly shoddy) datasheet says +4.5V is the bare minimum on Vcc, with +5V recommended. You can use the unit with only one Vcc, Gnd, and Data pin connected. It's OK to leave the others disconnected, it still works fine. But the range is only a ...

Re: RF Tx/Rx units - any fault finding advice?

 by 60amp_relay ¦  Sun Jun 20, 2010 5:56 pm ¦  Forum: Wireless/RF ¦  Topic: RF Tx/Rx units - any fault finding advice? ¦  Replies: 17 ¦  Views: 3753

This is something that trips up a lot of people. You need to have a low->high or high->low transition on the transmitter's data line at least once every 30ms or so. If you simply output a constant "1" on the transmitter, you'll get 30ms of "1" on the receiver and then a stream of garbage. In your pr...

Re: Getting started

 by 60amp_relay ¦  Wed Jun 16, 2010 5:45 pm ¦  Forum: SparkFun Site Questions/Comments ¦  Topic: Getting started ¦  Replies: 5 ¦  Views: 3117

It all depends on what you want to do, but I frequently find the following useful: - Largest breadboard you can find - +5v voltage regulator and a +12v wall-wart* - Assortment of breadboard jumper wires - Assortment of resistors 10, 100, 220, 500, 1K, 2.2K, etc. up to 100K - Assortment of capacitors...

Re: ESD warning for RF receiver modules

 by 60amp_relay ¦  Mon Jun 14, 2010 5:49 pm ¦  Forum: Wireless/RF ¦  Topic: ESD warning for RF receiver modules ¦  Replies: 2 ¦  Views: 674

Just wanted to post back confirming that the new RF Link receivers work great, whereas the old ones were only receiving garbage or had a very small range. I guess I must have zapped my receivers one time too many when plugging in the antenna.

Re: ATMega168 RS232 Not Working

 by 60amp_relay ¦  Sun Jun 13, 2010 3:26 pm ¦  Forum: SparkFun Product Questions ¦  Topic: ATMega168 RS232 Not Working ¦  Replies: 4 ¦  Views: 707

Just a quick thought, have you turned off Hardware Flow Control on the serial port? I've tripped on that little detail several times.