Comments on: Final Lightbar Controller

By: Flashing LEDs – Audio Meter – AVR ATTiny – Guitar Pickup Wiring – Sound Following Circuit

Sun, 13 Dec 2009 23:11:50 +0000

[...] circuit and code itself was based on a part of the circuit and code I found at Negative Knowledge. One point to notice is that the LEDs are connected in parallel, usually a no-no, but in this [...]

By: Random

Random — Fri, 27 Mar 2009 14:53:48 +0000

Thanks for the heads-up. I think you’re using a different version of the AVR libc, which is causing the warnings about delay.h.
The errors are definitely just bad code – you should be able to just define an “int j;” earlier on and then “for(j=0…” later to fix them.

By: etharooni

etharooni — Fri, 27 Mar 2009 14:10:00 +0000

Cool project! I’m actually turning your code into a high speed strobe photography rig. Unfortunately, you code has several build errors. I diagnosed several of them myself, but just to let you know…

In file included from ../HighSpeed.c:8:d:/program files/winavr/lib/gcc/../../avr/include/avr/delay.h:36:2: warning: #warning “This file has been moved to .”
In file included from d:/program files/winavr/lib/gcc/../../avr/include/avr/delay.h:37,
from ../HighSpeed.c:8:

d:/program files/winavr/lib/gcc/../../avr/include/util/delay.h:90:3: warning: #warning “Compiler optimizations disabled; functions from won’t work as designed”

../HighSpeed.c: In function ‘main’:
../HighSpeed.c:54: error: ‘for’ loop initial declaration used outside C99 mode
../HighSpeed.c:57: error: redefinition of ‘j’
../HighSpeed.c:54: error: previous definition of ‘j’ was here
../HighSpeed.c:57: error: ‘for’ loop initial declaration used outside C99 mode

make: *** [HighSpeed.o] Error 1
Build failed with 4 errors and 2 warnings…

By: Random

Random — Sun, 08 Mar 2009 19:52:55 +0000

I got the amp (and most of the parts) from Rapid Electronics in the UK (see my Suppliers page). In the US, I hear Digikey and Mouser are good for that sort of thing.

By: simone

simone — Sun, 08 Mar 2009 19:42:55 +0000

Hi, i am doing a project involving noise detection and motorspeed control. I was wondering, where did you buy your amp?
thanks. i’m new to all this, great project!

By: Justin

Justin — Thu, 05 Mar 2009 20:54:55 +0000

Hey thanks i see it now guess i wasnt looking hard enough I seen the voltage regulator in your schematic but missed the rest. Thanks again

By: Random

Random — Thu, 05 Mar 2009 20:22:07 +0000

Heya. Vcc is 5V coming out of a 5V linear regulator IC3 at the top-right of the schematic.

By: Justin

Justin — Thu, 05 Mar 2009 20:14:43 +0000

Hi I just found your project and I’m an fairly new EE student and I’m working on a similar project involving this mic was just wondering what your Vcc value was. Thanks looks great

By: Random

Random — Fri, 13 Feb 2009 19:52:25 +0000

In my application the sensitivity is pretty poor, but this leads to better synchronisation with the music as other noises (typing on the keyboard, talking, etc) are ignored. I haven’t tested it extensively but I don’t believe the sensitivity is brilliant for long ranges like a room – I get the feeling it is better for noises very nearby which obviously are louder for it. In other words, great to talk into it, not great for picking up noises in the room. You may want to try either a better (not electret, for one) microphone or some kind of noise amplification.

By: BillKilgallon

BillKilgallon — Fri, 13 Feb 2009 19:06:02 +0000

Hmmm. I’m playing with an audio project on a PIC 16F819 now, which has 3 A2D’s and allows you to set your own VREF for + and -. So I put it together going right from the output of the electret mic’s decoupling cap, no amp.

It works well for moderately loud noises, and great for yelling and clapping, but not for “normal room noise”.

Using your 386 op amp, how sensitive is the noise floor for this whole thing? Does the noise have to be loud, or can you tune it for normal ambient noises?

That Sparcfun mic is one of the more sensitive ones I have seen, so that probably makes the difference. My mic is whatever was in the box at Mendelsons that they were selling by the bucket