Search found 19 matches

by cpolley
Wed Dec 15, 2010 10:03 pm
Forum: New Product Ideas
Topic: SMD storage solution
Replies: 1
Views: 850

SMD storage solution

Hi guys, One question that seems to keep coming up with hobby SMD work is "how do you store/organize your components?". For the last year I've been using 4x4 IC trays ("wafflepacks") from Entegris. The size of each slot is perfect for holding a TQFP IC or say ~50 0805 resistors or capacitors. So I j...
by cpolley
Wed Oct 06, 2010 1:37 am
Forum: SparkFun Product Questions
Topic: Regis Jesuit's High Altitude Balloon
Replies: 2
Views: 613

Re: Regis Jesuit's High Altitude Balloon

Modular is a great idea, especially if you're using all this gear for the first time and might need to chop and change the setup as you learn. The BatchPCB.com service is a good option for PCB fabrication - there are tutorials here on sparkfun that will walk you through the whole process. If you're ...
by cpolley
Tue Oct 05, 2010 11:51 pm
Forum: SparkFun Product Questions
Topic: Mystery of Chinese Nokia6100 LCD
Replies: 2
Views: 975

Re: Mystery of Chinese Nokia6100 LCD

Two points: 1) You will burn out the backlight if you directly connect a voltage source to the two backlight pins ... a current limiting resistor is required. Of the top of my head I can't tell you what voltage the backlight runs or what current it wants to see, but you should find all of that in Ji...
by cpolley
Thu Aug 05, 2010 6:52 pm
Forum: Wireless/RF
Topic: Bicycle Accessories - Cadence, heart rate etc
Replies: 2
Views: 512

Re: Bicycle Accessories - Cadence, heart rate etc

Both the nordic and xbee units are 2.4GHz. You probably won't find any listed specifically as receivers because these do both TX and RX (unlike say the 433 modules). Get two and you have a two-way link. Cost- and difficulty-wise you're MUCH better off going wired; the reason to go RF is more about c...
by cpolley
Mon Jul 26, 2010 10:09 pm
Forum: Wireless/RF
Topic: More 315mhz modules that don't appear to work :(
Replies: 11
Views: 1697

Re: More 315mhz modules that don't appear to work :(

I encountered this problem a couple of years ago, and unfortunately I never managed to resolve it. You can check to see if the pinout has changed for some reason (it's happened before - pin assignments changing or RX-enable pins suddenly appearing), but I'm afraid you might be out of luck. Also with...
by cpolley
Mon Jun 14, 2010 7:12 pm
Forum: BatchPCB
Topic: Can't order 10 PCBs ...
Replies: 5
Views: 1308

Re: Can't order 10 PCBs ...

I had the same problem with ordering 5 PCBs, the update quantity box would reset to zero after progressing to the next stage of checkout. In the end I had to just add the design to the cart 5 times to make it stick.

Using Chrome 5.0.375.70
by cpolley
Tue Nov 03, 2009 6:43 pm
Forum: SparkFun Product Questions
Topic: Triggered Spectroscopy accomplished through an IMU
Replies: 8
Views: 1224

I assume that your spectrometer is fast enough that the 5Hz motion won't blur it all together, and that you know how to trigger it to read & save the save the data. If not you need to give more information. Maybe somebody better qualified than me can chime in, but my understanding is that an acceler...
by cpolley
Wed Oct 28, 2009 9:33 pm
Forum: SparkFun Product Questions
Topic: Question about Geiger Muller sensor @ SFE
Replies: 6
Views: 1112

Out of curiousity, what are the environmental concerns that prevent you from picking up a coloured paint stripe by (say) optical reflectance, and why do they not apply to picking up a radioactive paint stripe with a geiger counter?
by cpolley
Sun Oct 25, 2009 2:31 pm
Forum: SparkFun Product Questions
Topic: please help with code? for AT45DB161D
Replies: 1
Views: 707

1) Read the 45db16 datasheet and make sure your connections are what they should be 2) Read the datasheet for your PICs and make sure you know how to use the SPI interface (I've never used one so it's up to you) 3) Read the whole 45DB16 datasheet again 4) The simplest check to see that you can talk ...
by cpolley
Thu Oct 22, 2009 4:18 pm
Forum: AVR Microcontrollers
Topic: Program works when RESET is tied to VCC,doesn't w/ resistor?
Replies: 2
Views: 743

As Leon said, with the resistor connected you should still see 5V between reset and GND. If you don't then it probably isn't connected properly and your program isn't running because it's randomly resetting.
by cpolley
Tue Oct 20, 2009 3:55 pm
Forum: AVR Microcontrollers
Topic: Can't program my ATmega8 no matter what - pictures attached!
Replies: 29
Views: 5624

Well, good luck! Unfortunately, as a rule the fastest way to solve a problem is to spend money on it. Also: Don't connect your reset pin directly to VCC, or your programmer won't be able to pull it low when it needs to. Use a single 5 - 10kohm resistor between reset and VCC. And 2.5V on the reset pi...
by cpolley
Mon Oct 19, 2009 7:52 pm
Forum: AVR Microcontrollers
Topic: Can't program my ATmega8 no matter what - pictures attached!
Replies: 29
Views: 5624

Right, my mistake, it looks like you are giving an external supply. It might well be your programmer, but the things to try before deciding that are: 1) Double check that you have made the right connections to your programmer - are you sure you don't have the pins reversed? 2) Make sure (with a mult...
by cpolley
Mon Oct 19, 2009 7:40 pm
Forum: AVR Microcontrollers
Topic: Can't program my ATmega8 no matter what - pictures attached!
Replies: 29
Views: 5624

I've never used a parallel port programmer, but perhaps it does not provide power to your mega8 ... many ISP programmers have 5V/GND lines but that's because they expect to SEE 5V/GND, not provide it. If you haven't already tried it, connect an external 5V source.
by cpolley
Mon Aug 31, 2009 5:56 pm
Forum: SparkFun Site Questions/Comments
Topic: Nokia breakout: inductor very hot
Replies: 16
Views: 8234

I was having the same problems, so for future reference let me describe how I fixed it. This is the Nokia breakout SKU: LCD-08600. Powering the backlight at 3.3V the boost IC on the breakout got really hot. Powering it at 5V it was even worse; I turned it off pretty quick for fear of smoking the boa...
by cpolley
Wed Aug 26, 2009 3:24 am
Forum: Wireless/RF
Topic: Generic 434mhz wireless questions
Replies: 20
Views: 3788

Multiple TX to one RX: I have done exactly that, and it certainly works. Sharing one channel is a challenge but it's possible. I regret doing it with these units though, and I seriously recommend thinking about spending the extra on something like the nordic or xbee units. I just found the 434 units...