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1  Using Arduino / Interfacing w/ Software on the Computer / VixenLights Triggering on: November 21, 2013, 07:12:45 am
Has anyone used VixenLights software to program light sequences then download them to Arduino? I'd like to be able to use the Arduino to generate its own triggers from live music in real time and use these triggers to change light patterns in the code downloaded to the Arduino from VixenLights. I've read their documentation but not clear if it accepts external triggers.
2  Using Arduino / LEDs and Multiplexing / Re: 10 Watt high power LEDs. on: October 25, 2013, 09:57:29 pm
Those LED-to-LED transitions are rather harsh and could be softened up some... it's a mood lamp. Try slower PWM changes and if you're feeling adventurous, write a routine that cycles through the LEDs, remembering where each one was during the last cycle, so they're all lit to some extent at the same time but dim and brighten them on some pattern or randomly.
3  Using Arduino / Project Guidance / Re: How to detect a coin falling? on: September 21, 2013, 09:17:32 am
A coin falling past a detector is a lifetime to a 16MHz processor and interrupts should not be needed. I like one poster's idea to use the coin itself as the switch. Use two long, thin pieces of springy copper on either side of the coin slide and detect the short circuit made by the coin.
4  Using Arduino / Programming Questions / Re: 5V Output Current on Uno and Nano on: August 31, 2013, 01:13:30 pm
Oops... just realized I posted this to the Programming and not Projects forum.

Will be powering from a 9V regulator sourced by a 12V wall wart, so input power won't be an issue. So if 450mA is available from the onboard regulator I should be fine.

5  Using Arduino / Programming Questions / 5V Output Current on Uno and Nano on: August 31, 2013, 11:16:43 am
WHat is the output current of the 5V pin on a Nano and Uno? Doesn't appear listed in the board specs. I want to use the 5V output to power a few peripheral chips, pullups, and a couple of LEDs and don't know if I should add a separate 5V regulator or rely on the Arduino's. Appears my circuit will draw about 190mA from 5V pin, but I can increase value of pullup resistors to lower the current if needed.
6  Using Arduino / Project Guidance / Re: 3w leds 400w ATX PSU on: July 21, 2013, 11:01:06 pm
Marine lighting? Are you using batteries and an inverter or shore power (110V)? If using batteries and inverter, skip the power supply and run the LEDs from the boat's 12V batteries or else get a 12V or 24V supply instead of a computer supply where you're paying for things (5V output) you don't use.
7  Using Arduino / Project Guidance / Re: Music to vibration on: July 18, 2013, 11:24:21 pm
That link didn't work, but this (may be the same page) appears to work...
8  Using Arduino / Project Guidance / Re: Tide gauge and river water level sensor ideas on: July 16, 2013, 11:03:51 pm
Think the automotive ultrasonic transducer would work best as it's waterproof, and that approach requires no moving metallic parts that will get corroded, no matter how well-sealed. Sea water is pretty invasive and corrosive.
9  Using Arduino / Project Guidance / Re: Light organ with software filter for different spectrums. on: June 26, 2013, 06:36:09 am
I'm interested in how you "make them auto-calibrate to the signal level". DO you just read the average signal level and change a brightness ot threshold variable accordingly?
10  Using Arduino / Project Guidance / Re: LED light Project on: May 20, 2013, 08:49:03 am
Do you want them to turn on full or gradually brighten? I'd think that on full (while its still light out) then gradually dim as it gets dark, then possibly twinkle would be neat. Easy to do using the PWM Outputs.
11  Using Arduino / Project Guidance / Re: Sound Level Detector on: May 09, 2013, 05:42:42 pm
Have a look at...

and about halfway down the page is a schematic and description of an "Analog beat detector".

This circuit should do what you want. The comparator output is an impulse detector that tracks along with the background sound level. The lower Diode/C/R network at the "-" input is the "reference" or "sound level average" network.
12  Using Arduino / Project Guidance / Re: Arduino reading 4 or more fan tachs on: May 07, 2013, 11:35:00 pm
Approx. what is the fan tach frequency? It's often a fraction of the fan RPM. You may be able to use the  millis() or micros() to measure the delay between tach pulses (period)  and then convert the period to frequency (f = 1/t) . An RC network (integrator) on each fan tach and analogRead() to measure the output voltage from the network would work, which essentially converts the pulse rate to a voltage and won't be terribly accurate but should be good enough for what you want.
13  Using Arduino / Project Guidance / Re: Sound Level Detector on: May 07, 2013, 06:01:26 pm
"...sound abnormally exceeds that sound level" and "sensor detects a loud noise" are somewhat different. The former requires an sound level average while the latter, peak detection.

Do you want one (which one) or both? The Arduino can do both in software (with a little hardware to create an amplitude envelope, a "DC" level that reflects the sound amplitude) or both can be done in hardware and the Arduino can simply read the two levels.
14  Using Arduino / Project Guidance / Re: Sound Level Detector on: May 07, 2013, 01:35:54 pm
The brick includes a "high sensible microphone", but no amplifier, which isn't very "sensible".

15  Using Arduino / LEDs and Multiplexing / Re: Turning a simple 3w led w/arduino on: April 30, 2013, 06:55:20 am
The 317 will work as a current source but is not directly PWM-switchable without additional components. This thread discusses some options...,102101.0.html

I think the circuit with the transistor shutting off the ADJ pin will allow for a low-power transistor since it's only gating the high current output of the regulator. Uses a few more components but looks to be a better design (unless you're building a lot of them and looking for lowest parts count). THe other circuit will have large currents through the transistor and need a beefier heat-sinked transistor.
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