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31  Using Arduino / General Electronics / Re: Brushless motor control on: May 01, 2014, 10:21:38 am
Why?
5Amps, get a cheep 10Amp ESC and use the Arduino's PWM to set the speeds.
32  Using Arduino / General Electronics / Re: Calculating a decoupling capacitor. on: May 01, 2014, 10:16:45 am
What's to calculate?
A great big one for low frequencies next to the source,
A little bitty one for high frequencies next to the load.....
33  Using Arduino / General Electronics / Re: NChannel MOSFET/ LED circuit problems on: May 01, 2014, 10:08:49 am
Config 2 is trying to use the MOSFET as a high side switch.  Try it with a P chan MOSFET.
34  Using Arduino / General Electronics / Re: [Solved] Best way to detect if Breaker Switch is ON on: May 01, 2014, 10:05:49 am
Old fashioned way: Tape a CDS cell to a NE lamp,  connect one lead of the lamp to the return side of the power cord, connect a 10M ohm resistor to the other lead of the lamp, connect the other resistor lead to the appliance feed side of the main switch (your breaker), connect one side of the CDS cell to +5 V on the arduino, connect the other CDS cell lead to an analog in on the arduino in a voltage divider config.  determine the analog level when the switch is on.  in your software, then the analog in is at, or above, the above found analog value (less some very small amount), the switch is on, the CDS cell conducting and resistance lowered, thus imbalancing the voltage divider's condition when the switch is off.  You cann't get much more caveman than that.....
35  Using Arduino / Project Guidance / Re: Digital 8 bits word from stand-alone Arduino Uno USB port on: May 01, 2014, 08:29:56 am
Need just a little more description of what you want to do...
Arduino, driven by 5V will produce TTL compatible outputs.
36  Using Arduino / Project Guidance / Re: Arduino Superconputer on: April 28, 2014, 10:09:49 am
A hammer makes a poor screw driver, and vice versa.  Depending upon slot and size of the screwhead, an arduino could be used as a screw driver, but it ain't no computer.  It is a micro-controller, intended to replace some hardware.  While more powerfull than some computers used in the past (Apollo to the moon), it is still just a controller.
37  Using Arduino / Project Guidance / Re: 5v - 3.3v Logic Converter Guidance on: April 28, 2014, 09:16:32 am
download and read "http://www.nxp.com/documents/application_note/AN10216.pdf"
It will clear up a lot and has a great bi-directional converter circuit.
38  Using Arduino / Project Guidance / Re: ArPReS - Arduino Parachute Release System - Brainstorming on: April 24, 2014, 01:36:15 pm
I have my reservations on your plan, but certainly a worthy project.  I would still advise incorporation of an accelerometer to detect free-fall.  using throttle cut, throttle-up, or any other signal combination (far better to use a seperate channel than a combo signal, like throttle-up) assumes that the electronics are all functioning well.  How come that doesn't sound viable in a catastrophic failure condition. or is it just me?

All chiding aside, go for it and let us know how it works out.  Good Luck and happy landings to you.
39  Using Arduino / Project Guidance / Re: Determining location relative to arduino - 50yds or less on: April 24, 2014, 09:04:02 am
FBI does not use arduinos for such things.

they have access to much more powerful tools.
40  Using Arduino / Project Guidance / Re: Green Laser 3VDC Ebay on: April 22, 2014, 02:00:34 pm
Krupski gets the cigar on this one!  (those green dpss modules will handle 6volts from four AA's just fine).

I think I would try a MOSFET, but he's got it.
41  Using Arduino / Project Guidance / Re: ArPReS - Arduino Parachute Release System - Brainstorming on: April 22, 2014, 01:55:38 pm
1) how are you going to tell the difference between change in Baro induced by wind, prop wash, or normal aerobatic flight and loss of altitude due to catastrophic failure of the copter?
(hint: putting a foam buffer over the hole in the baro will take care of the first two, most of the time)

2) how are you going to throw the chute clear of the aircraft when deployed (are you familliar with the term 'cannon-balling')?

might want to look into an accelerometer and think about a solenoid?
42  Using Arduino / Project Guidance / Re: Green Laser 3VDC Ebay on: April 22, 2014, 08:53:26 am
Gimme a Break!!

50mW greenie e-bay laser = DPSS, prob > 50mW = prob 200mW or better IR pump diode.

No wonder the Arduino 3.3V supply couldn't get it to threshold current.......
43  Using Arduino / General Electronics / Re: can i put leds on serial line to show activity? on: April 18, 2014, 12:09:01 pm
John,

You put the LED and current limiting resistor between the Arduino pin and ground,, and the LED 'Sinks' (draws) power from the Arduino when the pin goes high ( the Arduino sources power to the LED).

You put the LED and resistor between +5Vdc and the Arduino pin,, and the LED 'Sources' power, from +5Vdc, to the Arduino pin when it goes low ( the Arduino sinks from the LED).

I think,,, My brain hurts....
44  Using Arduino / Project Guidance / Re: Blocking -VDC on: April 17, 2014, 02:07:55 pm
First prize to Polymorph for thinking outside of the box!!
45  Using Arduino / Project Guidance / Re: Blocking -VDC on: April 17, 2014, 01:31:23 pm
Instead of asking the sensors (polling), what about having the sensors alert you (interrupts)?
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