As an Arduino and watch enthusiast, I'd like to build a watch analyzer by myself, using our favorite boards.
A "watch analyzer" is a device where you place your watch, and it tells you if it is running late or in advance, and by how many seconds per day.
Yesterday I tried using an FC-109 microphone board, which has a MAX9812 chip : it was a real failure, as I don't understand why the measured sound using analogRead() moves that much, and nothing interesting was recorded.
Today I found a KY-037 board that has an analog mode like the FC-109, but also a digital one : above a given threshold, the measured value is high, else it is low.
Using this digital mode, I'd like to trigger an action on each measured tick, but first I have to be sure that the ticks would be recorded. I'd place my watch on a table, glass down, and would place the microphone on the back of the case where the movement is.
That's where I need your advice : would that work ? Do you have any other idea ? Would the KY-037 detect the small ticks if it very close to the case ?
I would expect not, those are typically designed to pick up hand clapping kind of noise levels. You need a pretty sensitive microphone to pick up such light noises.
A contact microphone is what you need, with quite a lot of amplification. An electret is the wrong sort and
has little sensitivity for vibrations in the body.
You might even find a standard flat piezo element does a good job as a contact mic.
wvmarle:
I would expect not, those are typically designed to pick up hand clapping kind of noise levels. You need a pretty sensitive microphone to pick up such light noises.
That's what I thought, yes...
MarkT:
A contact microphone is what you need, with quite a lot of amplification. An electret is the wrong sort and
has little sensitivity for vibrations in the body.
You might even find a standard flat piezo element does a good job as a contact mic.
More than you "need", of course. But "gets you (most of the way) there", I would guess!
A small box full of cotton wool, in which you can place watch, with microphone of the sensor in direct contact, and close... to isolate watch and sensor... would probably help a lot. Do be careful about heat build up.
More than you "need", of course. But "gets you (most of the way) there", I would guess!
A small box full of cotton wool, in which you can place watch, with microphone of the sensor in direct contact, and close... to isolate watch and sensor... would probably help a lot. Do be careful about heat build up.
Elektuur magazine (Dutch), now Elektor, published such a watch "time ballance" project in the Jan 1990 issue.
They used a big 1" piezo disk as contact microphone, and a preamp with threshold detector.
Pictures in post#18 of this thread.
Leo..
MarkT:
No, that's not a contact microphone, it'll not help.
Yes. You need a bare element because you need direct contact, not via air.
Ok, I'll get one.
When using it, would I place the element on a table and then the watch above it, or would I place the watch glass down on a table and then press the element on it ?
I assume I'd have issues with the latter solution as my fingers would be pressed against the element.
Wawa:
Elektuur magazine (Dutch), now Elektor, published such a watch "time ballance" project in the Jan 1990 issue.
They used a big 1" piezo disk as contact microphone, and a preamp with threshold detector.
Pictures in post#18 of this thread.
Leo..
