Comments on: Cheap Sound Sensor for AVR

By: Krzysiek

Krzysiek — Mon, 30 Jan 2012 22:34:38 +0000

The diffrence between adc output is probably caused by AVREF specification. In atmega88 u can choose between AVcc/1.1V/AREF . I calculated aprox values with diffrent VRefs and thats what i got:

for AVcc ~ 176
for 1.1V ~ 800

the formula is very simple ADC = AIN/AVREF * 1024

PS. I used BC337 and output voltage was 0,86V.
PS2. Nice and simple amp

By: saqib

saqib — Mon, 30 Jan 2012 16:46:57 +0000

hey, i was jus wondering if i can put the output from the amplifier into an arduino uno?

By: Moritz

Moritz — Sun, 15 Jan 2012 14:26:48 +0000

Sorry for the double post.
It works just fine with a value of 800 now!
My problem was, that I sent every single value to my console with printf and therefore the programm was to slow. Now it is really sensitiv, even to the sound of me writing on my keyboard!
Again thank you for this real simple but great sound sensor!

By: Moritz

Moritz — Sun, 15 Jan 2012 13:54:50 +0000

Hi,
thank you for this great setup. We built a RGB-LED Controller in a project and I added the Sound Sensor. We used only SMDs, so I choose the MMBT3904 instead of the 2N3904. Well, it does work. But I have the same problem as Josh(#38). My ADC output value is allways around 800 (10bit). And it only varies about +/- 10 when I play some sounds, so it is very tricky to find the right trigger level. What is your difference between silence and sound? I used an MCE101 instead of the MCE 100 but the only difference should be the cable… Has anyone an idea what could cause my high level?

By: Alex

Alex — Sat, 24 Dec 2011 09:08:49 +0000

It’s only a couple of bucks. Only cents if you don’t count the microcontroller.

By: anzal

anzal — Fri, 09 Dec 2011 13:04:59 +0000

yaa i have no idea about sound sensor.may i know how much money should i have to spend for this projet??

By: Raj

Raj — Mon, 29 Aug 2011 09:17:17 +0000

Hi,
I have no knowledge in microcontrollers but i can work with labview. I am searching for sound sensor that hear the noise from a pump. Do you have any idea to do this. I had a pump that can give noise when inside the storke is touched to mechanical parts. I need to adjust it by using sound sensor. Can you help with any idea,

By: Vignesh

Vignesh — Fri, 19 Aug 2011 15:10:47 +0000

Hey, great tutorial! I’m thinking of recreating it, though not exactly the same.. Could you tell me if you really need capacitors C2 and C3 which are connected to ports 9 and 10 on the schematic above? Also, is Q1 needed? I’m thinking of using making the following circuit, connecting the “Output to next stage” to an ADC pin, and a servo to an output pin. http://www.reconnsworld.com/audio/simplepreamp.gif

Thanks for your time,
Vignesh R.

By: Alex

Alex — Sat, 21 May 2011 09:10:31 +0000

The output is analog but I needed only a trigger.

By: NOOR

NOOR — Sat, 21 May 2011 09:03:04 +0000

Hey!
just a simple question the output should be analog or a trigger ?!