SparkFun Forums 

Where electronics enthusiasts find answers.

Search found 409 matches

 Go to advanced search

Re: COLOR NOKIA E51 LCD IS FINALLY HACKED 240x320 Pixels

 by angelsix ¦  Sun Mar 28, 2010 8:03 am ¦  Forum: SparkFun Product Questions ¦  Topic: COLOR NOKIA E51 LCD IS FINALLY HACKED 240x320 Pixels ¦  Replies: 10 ¦  Views: 14982

Well I don't know about anyone else but I am just getting tired of this guy posting saying he has hacked LCDs. Big deal, why does anyone else care and why does he seem so needy to mention "I am 100% sure I am the first". Controlling LCDs are mostly all identical, and with a scope and enough time any...

Re: Ultrasonic Sensor Interfacing

 by angelsix ¦  Thu Mar 25, 2010 12:35 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Ultrasonic Sensor Interfacing ¦  Replies: 3 ¦  Views: 578

I have worked extensively on the outdoor versions of these sensors and there are lots of posts about it if you search for my username. For the indoor ones they are much simpler, you can easily drive them directly from a uC at 5V at 40kHz. You then need to amplify the echo coming back by about 1500x ...

Re: Another LED Project... help please.

 by angelsix ¦  Sun Mar 21, 2010 11:55 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Another LED Project... help please. ¦  Replies: 16 ¦  Views: 1834

The LEDs brightness with vary with current, and you are not really varying anything. Audio line levels (if that is what you are using) vary the voltage I believe, so all you will be doing is adjusting the saturation level of the NPN, which really isn't going to vary the output current. It would if y...

Re: Another LED Project... help please.

 by angelsix ¦  Fri Mar 19, 2010 1:22 am ¦  Forum: SparkFun Product Questions ¦  Topic: Another LED Project... help please. ¦  Replies: 16 ¦  Views: 1834

Its an NPN transistor so you did put the LED bar on the collector side not the emitter side yeah? And add a 10k resistor to the base to limit the base-emitter current to 1.2mA and the minimum 25 DC gain will give the circuit close to 30mA (even though it will be limited by the LED bar anyway but doe...

Re: LM317 boards for the high power LED's

 by angelsix ¦  Fri Mar 19, 2010 1:00 am ¦  Forum: New Product Ideas ¦  Topic: LM317 boards for the high power LED's ¦  Replies: 17 ¦  Views: 4586

Which should lead you back to a good old LED constant current driver :lol:

Re: Boosting voltage without transformer... something SMD?

 by angelsix ¦  Wed Mar 17, 2010 8:35 am ¦  Forum: SparkFun Product Questions ¦  Topic: Boosting voltage without transformer... something SMD? ¦  Replies: 16 ¦  Views: 2481

The reason I have limited the current to 50mA is because I plan to have 12 of these plus a uC running from a switching power supply currently supplying 0.5A so it is very borerline as it is, so I may just up the power supply to 1A, but if I lower the R7 to 47 it will be the same again, but I will tr...

Re: Boosting voltage without transformer... something SMD?

 by angelsix ¦  Wed Mar 17, 2010 1:26 am ¦  Forum: SparkFun Product Questions ¦  Topic: Boosting voltage without transformer... something SMD? ¦  Replies: 16 ¦  Views: 2481

Mark, Just to let you know I added the BAV to the transformer and I think it gave a slightly more sensitive reading than before, possibly a foot or 2 more on the distance which is good so I've added it to the future boards. Now I have a working sensor for up to about 3 meters for the unknown one, an...

Re: LM317 boards for the high power LED's

 by angelsix ¦  Tue Mar 16, 2010 3:15 pm ¦  Forum: New Product Ideas ¦  Topic: LM317 boards for the high power LED's ¦  Replies: 17 ¦  Views: 4586

Thats some crazy cheap switching regs at $2 with all the tant caps and ICs on the board! :shock:

Re: LM317 boards for the high power LED's

 by angelsix ¦  Tue Mar 16, 2010 2:38 am ¦  Forum: New Product Ideas ¦  Topic: LM317 boards for the high power LED's ¦  Replies: 17 ¦  Views: 4586

True, but the example again is crazy powered, at 4.5A thats 54W at 12V, and you only need 1W (83mA at 12V), so you could go much cheaper (same price or cheaper than LM317) and still get enough for 10 LEDs in series if you take a look at the range. But its just an option if you prefer to just do a di...

Re: Touch (capacitive) wall light switch

 by angelsix ¦  Mon Mar 15, 2010 8:26 am ¦  Forum: SparkFun Product Questions ¦  Topic: Touch (capacitive) wall light switch ¦  Replies: 13 ¦  Views: 7210

My old man is a spark with 30 years experience and he is very safety ortiented when it comes to the regs, so I'm sure I could pass the idea by him and get an acurate description of the reg requirements next time I see him. I'm sure the regs are a lot simpler than most think though, and just requires...

Re: LM317 boards for the high power LED's

 by angelsix ¦  Mon Mar 15, 2010 8:20 am ¦  Forum: New Product Ideas ¦  Topic: LM317 boards for the high power LED's ¦  Replies: 17 ¦  Views: 4586

Yes the IC is not for Lum high power LEDs I was just mentioning it as a suggestion as a voltage booster LED controller as I thought you would be trying to power LEDs from a lower voltage, in which case hardly any LEDs could be stringed together. If you only intend to series 2-3 LEDs in a row and hav...

Re: Touch (capacitive) wall light switch

 by angelsix ¦  Mon Mar 15, 2010 1:23 am ¦  Forum: SparkFun Product Questions ¦  Topic: Touch (capacitive) wall light switch ¦  Replies: 13 ¦  Views: 7210

This is one of my todo projects also as I would like to create a cap touch light switch that is fully enclosed and powered from the original wall sockets, however I have not yet got around to it or researching much about it yet. If space isn't an issue (which I don't think it will be once measured) ...

Re: LM317 boards for the high power LED's

 by angelsix ¦  Mon Mar 15, 2010 1:18 am ¦  Forum: New Product Ideas ¦  Topic: LM317 boards for the high power LED's ¦  Replies: 17 ¦  Views: 4586

Correct me if I am wrong but I thought the LM317s were not voltage boosters just regulators so you could use a feedback resistor to get a cheap constant current circuit, but would still only have the max voltage of the supply, and so any series LEDs would eat up the voltage after a few LEDs. What wo...

Re: Boosting voltage without transformer... something SMD?

 by angelsix ¦  Sun Mar 14, 2010 1:34 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Boosting voltage without transformer... something SMD? ¦  Replies: 16 ¦  Views: 2481

Mark,

Ah right I see what you mean now makes sense. I will cut out the trace and add a BAV between the transformer and sensor and do a comparison with the sensitivity.

Luke

Re: Is it realistic to create a touch screen with sensor?

 by angelsix ¦  Sun Mar 14, 2010 1:32 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Is it realistic to create a touch screen with sensor? ¦  Replies: 3 ¦  Views: 506

The biggest most commercial touches go is 19.1" and they are only £65ish (http://uk.farnell.com/higgstec/t192s-5r ... dp/1657639)

  • 1
  • 3
  • 4
  • 5
  • 6
  • 7
  • 28