Advice for debugging a circuit?

Projects General Guidance
1

Hello! I've attempted to implement this circuit, which ought to produce an output based on the level of bioelectrical activity in whatever its leads are touched to:

http://backyardbrains.com/products/spikerbox

Unfortunately, it's not working - when I have the arduino print its analogread value for the pin I've connected, it produces a number that oscillates from 0 to 1023 and back regardless of what's touching the leads, or even whether or not it's connected to the 9v battery.

How should I go about trying to debug this?

Cheers,
Ashok

2

A first!
A partial schematic with the legend "To Cockroach leg".

Emphasis on "partial".

Have you tried contacting the manufacturers?

3

AWOL:
A first!
A partial schematic with the legend "To Cockroach leg".

"First, catch your cockroach..." :slight_smile:

But he's asked for advice on de-bugging it?

4

Henry_Best:
"First, catch your cockroach..." :slight_smile:

Or just order up a dozen. Interesting site.
http://backyardbrains.com/products/cockroaches