SparkFun Forums 

Where electronics enthusiasts find answers.

Search found 1981 matches

 Go to advanced search

Re: Options to Multiple Loops on Arduino

 by Philba ¦  Thu Sep 27, 2012 3:10 pm ¦  Forum: Arduino ¦  Topic: Options to Multiple Loops on Arduino ¦  Replies: 5 ¦  Views: 3751

I think part of your problem is you use one variable to ensure both inputs go low. It seems clumsy to do it that way anyway. I'd use a finite state machine technique. gives a decent treatment of this technique. done right, it takes very little code. ...

Re: Sensor to check Vehicle is fully on platform

 by Philba ¦  Thu Sep 06, 2012 10:50 am ¦  Forum: SparkFun Product Questions ¦  Topic: Sensor to check Vehicle is fully on platform ¦  Replies: 2 ¦  Views: 403

Actually, I think the platform has load cells built in. Can you get access to the weight data? Joeisi's idea makes sense. If you have too wide a range of weights that will be on the platform, you can tell when the 2nd set of wheels is on platform by watching for 2 plateaus in the reported weight - o...

Re: Calculating voltage requirements

 by Philba ¦  Thu Sep 06, 2012 8:13 am ¦  Forum: SparkFun Product Questions ¦  Topic: Calculating voltage requirements ¦  Replies: 4 ¦  Views: 443

Very simple problem, very simple solution. Your 4 fans each pull 150 mA so you need to supply 12V at 600 mA. Find a 12VDC wall wart that can deliver 600 mA or better. Note, thrift stores have lots of WWs that they sell for a buck or less. Don't waste your time building a power supply unless you see ...

Re: Selling projects - getting sued!

 by Philba ¦  Thu Sep 06, 2012 7:38 am ¦  Forum: SparkFun Product Questions ¦  Topic: Selling projects - getting sued! ¦  Replies: 3 ¦  Views: 797

Talk to a lawyer. There are ways to ensure that the liability is to your company, not you personally. it will cost more but you can protect yourself. FWIW, the techie/diy market tends to be much less interested in suing so selling components t them is lower risk. Also, not having deep pockets keeps ...

Re: Schottky Diode selection

 by Philba ¦  Wed Aug 01, 2012 3:37 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Schottky Diode selection ¦  Replies: 4 ¦  Views: 888

Context is important. Post the schematic.

Re: advice?: need to control a lot of LEDs from laptop

 by Philba ¦  Wed Jul 25, 2012 6:34 pm ¦  Forum: SparkFun Product Questions ¦  Topic: advice?: need to control a lot of LEDs from laptop ¦  Replies: 8 ¦  Views: 917

The problem with BlinkMs is they get way pricey if you need a lot of them. 8 of them cost $100. The max7219 is more for driving multiplexed (7 segment) displays with no individual control. I'd suggest something like the TLC5940 which will drive 16 channels with 4096 intensity levels. It comes in a D...

Re: advice?: need to control a lot of LEDs from laptop

 by Philba ¦  Tue Jul 24, 2012 9:33 am ¦  Forum: SparkFun Product Questions ¦  Topic: advice?: need to control a lot of LEDs from laptop ¦  Replies: 8 ¦  Views: 917

This is pretty easy to do. A lot depends on how you want to arrange the LEDs. There are strips of LEDs (at SFE and other places) that have individually addressable lights an inch or so apart. They can be controlled by a small number of wires (typically 4). Use a USB Arduino (like the micro, for exam...

Re: Passing arrays to functions, unexpected results

 by Philba ¦  Sun Jul 22, 2012 11:06 am ¦  Forum: Arduino ¦  Topic: Passing arrays to functions, unexpected results ¦  Replies: 9 ¦  Views: 10821

and you don't want to show your modified function because...? For more information, check here- viewtopic.php?f=32&t=33083

Re: Passing arrays to functions, unexpected results

 by Philba ¦  Sat Jul 21, 2012 4:14 pm ¦  Forum: Arduino ¦  Topic: Passing arrays to functions, unexpected results ¦  Replies: 9 ¦  Views: 10821

well if sendMitsubishi is similar tothe other send routines, the first argument is an unsigned long, not a pointer to an array. I suggest an understanding of what you are calling is in order.

Re: Help with code

 by Philba ¦  Sat Jul 21, 2012 4:06 pm ¦  Forum: Arduino ¦  Topic: Help with code ¦  Replies: 6 ¦  Views: 1070

There's something wrong with my car. It seems to be making a strange noise and doesn't work right. Could some one fix it please.

Re: multiplexing 284+ pins

 by Philba ¦  Wed Jul 18, 2012 1:15 pm ¦  Forum: Arduino ¦  Topic: multiplexing 284+ pins ¦  Replies: 3 ¦  Views: 1671

Pretty good advice The TLC59116 will need common anode RGB LEDs. I second the idea of RGB strands. There are several that support individual addressable LEDs and work off of a small number of pins - 4 typically. A strand would be much easier to manage for RGB LEDs. This is assuming you want to be ab...

Re: Project: VGT Controller

 by Philba ¦  Sun Jun 24, 2012 9:16 am ¦  Forum: SparkFun Product Questions ¦  Topic: Project: VGT Controller ¦  Replies: 3 ¦  Views: 1104

Yeah, it sounds doable though there may be issues of response time - reading data and getting the VGT to respond may have some lag. I assume by CAN you mean OBD-II. You can get data via an OBD-II connector. I'd suggest an arduino as the controller since it supports PWM directly. I'm not sure how to ...

Re: PBC Relay 9Vdc

 by Philba ¦  Sun Jun 24, 2012 8:50 am ¦  Forum: SparkFun Product Questions ¦  Topic: PBC Relay 9Vdc ¦  Replies: 4 ¦  Views: 702

Looking at the data sheet, there are 2 relays coils - 1W and 900 mW. I'll use the 1W coil data since the 900 mW one is only 10% different. The 5V coil is rated at 25 Ohms (200 mA). This means that at 9V it will draw 360 mA and dissipate 1.8 W. That seems pushing it, especially if it's a 9V battery -...

Re: Connecting an ESC to an Arduino

 by Philba ¦  Thu Jun 14, 2012 7:50 am ¦  Forum: Arduino ¦  Topic: Connecting an ESC to an Arduino ¦  Replies: 6 ¦  Views: 4861

Skye, you are right, I misread using PWM. I've seen postings from a fair number of people talking about using analogwrite to control servos and such.

Re: building an audio

 by Philba ¦  Thu Jun 14, 2012 7:17 am ¦  Forum: SparkFun Product Questions ¦  Topic: building an audio "gun"? ¦  Replies: 30 ¦  Views: 2865

electro magnet pulse canon. You need a quantum thermonuclear device with 2.3 gigaTesla focusing ring to direct and accelerate the pulse in the right direction. You might want to evacuate the people living behind them, though. I think if you'd fit an EMP cannon with a back end retro-encabulator, you...

  • 1
  • 2
  • 3
  • 4
  • 5
  • 133