The probe was likely an ultrasonic, if you heard the blood flowing.

Agreed.

Doppler is typically used for blood flow probes.

[ed]
http://en.wikipedia.org/wiki/Medical_ultrasonography
[/ed]

 

Hand held Doppler (fetal and blood flow) monitors are common. They just translate organ movement to sound. http://www.facelake.net/fetaldoppler.html

ken

 

Squirrsshhhaafllooop I believe..

Why is it I end by like this when ever you reply

 

So did we scare the OP away?

 

Attach a couple of accelerometers to a belt that mom is wearing, and connect them to a microcontroller that has been programmed to log acceleration as strong as a kick.

You can buy little solid state accelerometer chips fairly inexpensively, and a belt-mounted microcontroller could log to an SD card to track the time and characteristics of the events.

Somebody would have to design and wire up the circuit, and write the microcontroller program, which would not be trivial, and somebody would need to figure out how to come up with a threshold motion so you're not logging every motion that mom makes.

But I'll bet it would work!

 

So did we scare the OP away?

I think the OP got more than he/she bargained for

 

A day or so late & no OP, but why waste good usless information: Homemade geophone [seismometer- accelerometer ] consisting of 2 1/2 in 8 ohm speaker with 3 pennys glued to center readily detected light caugh, about 20 mV PP.

 

didnt know you guys replied, sorrrry. I was busy with the designing part..
and go around asking abt microphone but it seems the electrical guy i asked don't really get what i mean.. will be buying accelerometer tmr!!

 

A day or so late & no OP, but why waste good usless information: Homemade geophone [seismometer- accelerometer ] consisting of 2 1/2 in 8 ohm speaker with 3 pennys glued to center readily detected light caugh, about 20 mV PP.

what is this 3 penny ?
is piezo sensor the same like acclerometer?

 

A day or so late & no OP, but why waste good usless information: Homemade geophone [seismometer- accelerometer ] consisting of 2 1/2 in 8 ohm speaker with 3 pennys glued to center readily detected light caugh, about 20 mV PP.

Attach a couple of accelerometers to a belt that mom is wearing, and connect them to a microcontroller that has been programmed to log acceleration as strong as a kick.

You can buy little solid state accelerometer chips fairly inexpensively, and a belt-mounted microcontroller could log to an SD card to track the time and characteristics of the events.

Somebody would have to design and wire up the circuit, and write the microcontroller program, which would not be trivial, and somebody would need to figure out how to come up with a threshold motion so you're not logging every motion that mom makes.

But I'll bet it would work!

thank you for your information, but what type of accelerometer chips should i get?

 

So did we scare the OP away?

Im still here Mr. Marsden. I went around to ask about your idea of using microphone, but they didnt seem to get what i mean..

 

Around where? This site is mostly about doing it yourself, so a lot of people wouldn't "get it".

At the rate you're going the kid will be here before you finish.

You need a simple high gain audio amplifier. Used to be they were not hard to find, but times change. The Bionic Ear may work, but it might not either.

The microphone you're going to have to build yourself, as well as the LED display. Take it in pieces, and you can do this, but it is going to be work, a lot of it hard and frustrating.

If you can find some high school electronics type, or better, then you might be able to go faster. Speaking for myself I usually have plenty of irons in the fire (read that as a lot of projects I'm working on).

 

There is a building near my place, where it's mainly sell electrical stuff, and so i went there and ask from shop to shop about this microphone thing,but no one there seems to get what i mean.

thanks for your info.. I will take note of what you ve told me. and will work on it asap. thankyouuuuu much

 

There is a building near my place, where it's mainly sell electrical stuff, and so i went there and ask from shop to shop about this microphone thing,but no one there seems to get what i mean.

If you are referring to the "microphone" being described in posts #17, 18, 27, and 29, it is really a speaker that is converted to microphone use. Consider a speaker with a coil on the cone and a magnet. As the cone is made to move by vibrations, a small voltage will be produced as the coil moves through the magnetic field.

Post #29 suggests adding weight (that is, three pennies) to the cone to increase its sensitivity to vibrations. Three American pennies -- our smallest denomination coin -- weigh approximately 7.5 g (1/4 ounce).

John