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Re: How to safely encase components (e.g., epoxy, caulk, etc

 by Duane Degn ¦  Thu Aug 16, 2012 11:04 pm ¦  Forum: SparkFun Product Questions ¦  Topic: How to safely encase components (e.g., epoxy, caulk, etc.)? ¦  Replies: 10 ¦  Views: 2265

I've used Sugru and Polymoph to encase electronics. They both seem to work fine. You do need to make sure anything encased in Polymoph doesn't get very warm or the Polymorph will melt. Polymorph sticks to wire insulation really well so keep warm Polymorph away from any insulation you're not planning...

Re: Nrf24L01+ modules dying

 by Duane Degn ¦  Wed Aug 01, 2012 11:47 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Nrf24L01+ modules dying ¦  Replies: 4 ¦  Views: 2363

While the nRF24L01+ I/O pins are 5V tolerate the Vdd pin is not.

These modules should be powered with 3.3V.

BTW, you can get them really cheap (<$3) on ebay. The ebay units aren't as nice as SparkFun's but the work just fine.

Re: Newbie just starting questions for a project

 by Duane Degn ¦  Tue Jul 31, 2012 5:41 am ¦  Forum: Wireless/RF ¦  Topic: Newbie just starting questions for a project ¦  Replies: 9 ¦  Views: 1012

I agree with what stevech said. If you want to combine video and data you really need a computer at the sending end. I'd suggest two separate signals, video and data. For data, a pair of XBee XSC modules would likely work at a mile if there are too many obstructions.

Re: Interfacing with nRF24L01 (SPI-problem)?

 by Duane Degn ¦  Sun Jul 29, 2012 2:17 pm ¦  Forum: Wireless/RF ¦  Topic: Interfacing with nRF24L01 (SPI-problem)? ¦  Replies: 1 ¦  Views: 1280

The CSN line needs to stay low the entire read. CSN low, SPI write (read + register to read) (the status register can be read as the read command is given). Next byte with CSN still low, SPI write 0xFF while reading the register value just requested. CSN should then be set high. The status should on...

Re: Medium-density linear array of LEDs or plasma dots

 by Duane Degn ¦  Wed Jul 25, 2012 11:34 pm ¦  Forum: New Product Ideas ¦  Topic: Medium-density linear array of LEDs or plasma dots ¦  Replies: 2 ¦  Views: 1534

I think you could get 20 dpi using 0603 smt LEDs. The strip of 100 red smt LEDs I have in front of me cost $10.50. 30" @ 20 LEDs per inch would be 600 LEDs. You'd also need a current limiting resistor for each LED (resistors are dirt cheap when you buy a bunch). You culd use 595 shift registers to m...

Re: Beginning Embedded Electronics parts list

 by Duane Degn ¦  Sun Jul 22, 2012 10:18 am ¦  Forum: SparkFun Site Questions/Comments ¦  Topic: Beginning Embedded Electronics parts list ¦  Replies: 2 ¦  Views: 1179

This all depends on what you want to do. It probably doesn't come with everything you need. If you tell us what you want to accomplish, we'd be better able to suggest any extra parts you may need/want.

BTW, which kit are you referring to? I don't know which kit goes with their lectures.

Re: After Arduino??

 by Duane Degn ¦  Sat Jul 21, 2012 11:32 pm ¦  Forum: Arduino ¦  Topic: After Arduino?? ¦  Replies: 2 ¦  Views: 580

Derek Malloy has some tutorials which include building an Arduino on a breadboard. This might help you make your own circuit without an actual Arduino board. I have some other AVR/Arduino links here.

Re: Ultimate wireless technology for indoor sensors ?

 by Duane Degn ¦  Sat Jul 21, 2012 11:19 pm ¦  Forum: Wireless/RF ¦  Topic: Ultimate wireless technology for indoor sensors ? ¦  Replies: 5 ¦  Views: 1408

If you want to use lots of transceivers, you could use the Nordic nRF24L01+ modules. Here's a place where you can purchase ten units for $18.99 shipped. I think that's still less expensive than one XBee module.

Re: Problems with pinout.

 by Duane Degn ¦  Fri Jul 20, 2012 4:58 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Problems with pinout. ¦  Replies: 8 ¦  Views: 993

I usually like to solder to a trace rather than the pins of an IC if the IC has fine pitched leads. Just scrap the solder resist off the trace you want to solder to. It's a good idea to use some flux in cases like this. I agree with Alex's and waltr's advice about cutting traces and soldering. A sin...

Re: How do I connect male pin into Arduino female pin?

 by Duane Degn ¦  Fri Jul 20, 2012 4:49 pm ¦  Forum: SparkFun Product Questions ¦  Topic: How do I connect male pin into Arduino female pin? ¦  Replies: 3 ¦  Views: 583

One way is to plug the pins of your device into a breadboard and then use normal hook up wire. The easier way is to get some M/F jumpers. I usually ...

Re: Problems with pinout.

 by Duane Degn ¦  Thu Jul 19, 2012 12:11 am ¦  Forum: SparkFun Product Questions ¦  Topic: Problems with pinout. ¦  Replies: 8 ¦  Views: 993

Can you find the datasheet for each component on the board? If you can, then you could check (with a multimeter) which pinout connects with which pin on the chips and use the datasheet to figure out the pin's purpose.

Re: Help needed

 by Duane Degn ¦  Thu Jul 19, 2012 12:07 am ¦  Forum: SparkFun Product Questions ¦  Topic: Help needed ¦  Replies: 9 ¦  Views: 913

I hear Craig's List is the place to check for wheel chair motors. Search for power chair. I think you could get by with a much smaller motor. You'll likely need some sort of encoders to measure the speed of the wheels so you can adjust the power delivered to the motors appropriately. I was very plea...

Re: Project help Request; Arduino Cubmobile / Soapbox Race T

 by Duane Degn ¦  Tue Jul 17, 2012 11:22 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Project help Request; Arduino Cubmobile / Soapbox Race Timer ¦  Replies: 14 ¦  Views: 1923

The anti-static foam that comes with a lot of electronic parts changes its resistance when compressed. By using the foam with an ADC you should be able to detect when it has been compressed. I think the normal way of using a hose to detect a vehicle crossing is to use a some sort of pressure switch ...

Re: Project/product: high res/update rate laser rangefinder

 by Duane Degn ¦  Tue Jul 17, 2012 10:55 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Project/product: high res/update rate laser rangefinder ¦  Replies: 24 ¦  Views: 8379

Operation would be based on transmitting a high frequency modulated laser beam and then measuring the phase shift of the returned light. I'm not familiar with this approach to distance measurement. What "phase shift" are you measuring? The Parallax LRF is open source but the camera manufacturer req...

Re: Displays for CMOS camera

 by Duane Degn ¦  Tue Jul 17, 2012 10:37 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Displays for CMOS camera ¦  Replies: 3 ¦  Views: 444

I linked to the wrong camera. The IR camera is here: Both the IR camera and the other camera I listed also work with PAL. Adafruit has several differnt small displays that work with NTSC and PAL. Here's one: If a display sup...