Electromyography (EMG) of the muscles in the forearm that move the fingers might work. Usually the MG is recorded wit needle electrodes, but it's possible to...
Dear friends, I've the following problem. I need to use a 5v range sensor with a 3.3v range ADC from a ds33PIC microprocessor. Do anyone knows how can I do it?...
Rafael, Voltage divider is a legitimate way of doing this, if the resistor values are small enough. The value of the lower resistor in the voltage divider is...
Thanks everybody! Larry, that kind of keyboard design is more common than most people think. I'm not all that worried about the logic/software side, thats ...
I recently saw an accelerometer that actually has tap sensing built in. It's the LIS302DL from ST Micro. Here's a link to its page on www.sparkfun.com, there...
I was looking at accelerometers on Analog Devices, and I have to admit that the ide is growing on me, a dual axis accelerometer on each finger would give me a...
wow, thanks Keith! That looks like a perfect match, I'm seriously thinking about ordering one of those now to start working out the interfaceing... The I2C...
Picking up the EMG signal is relatively easy. The analog hardware is relatively simple. The analog front end topology is about the same for EMG, ECG/EKG,...
Hello, I was recommended this place by a fellow online forum member . I am doing a research in microrobotics, and it is a walking robot (size is about 4cm x...
Why not just use a pot? same concept but with resistance instead of capacitance and a lot easier to work with. ... From: smallrobots <smallrobots@...> ...
Look into recent radio control servo feedback configurations in the miniature aircraft. Resistors work well, caps work but were a pain, greycode optical...
Yes, you are right that potentiometers are the obvious choice, but I could not find pots that small and still have a decent life (10,000+ rotations). Trimpots...
If very small size and long life are paramount, and accuracy and cost are lesser factors I think capacitive may be a valid choice. The electronics to read a...
Hi all, i need a liquid flow sensor for monitoring consumption of diesel in a truck. most of the sensors i see is for high flow rate. i'll need something...
Thanks for your suggestions. Just to clarify my point, the biggest factor is the size and weight (after all, it is a microrobotics research). The sensor should...
I have a project where I need to measure the linear distance a drill bit travels in order to determine the length of the hole drilled. The drill bit will spin...
... You can add an electrically insulating sleeve with conductive bands on it around the drill bit. ... In principle, the rotation shouldn't affect the...
Here’s another proposed way of putting conductive bands on the drill bit. Step 1. Pot the place on the drill bit where you want to have bands with some...
How would I create the sensor part on the drill bit? What ... the ... advice ... One thing, which is not based on capacitance, is to put the bit in a lathe...
How about on the shank of the drill where there are no flutes, depositing a nonconductive layer. Varnish, wax, anything. On top on this layer then deposit a...
... depositing a nonconductive layer. Varnish, wax, anything. ... carbon, You would end you with a resistor over the length of the layer. ... layer, giving you...
Hi Brian, I have actually had a 4th idea. So far all ideas have revolved around the drill bit. Bad idea! The top of all drill presses I have used have the arm...
OK, point taken, You are right, after a lot of use my initial idea would fail. So, how about this? It assumes your holes are not going to be very deep. Get a...
... would fail. So, how about this? It assumes your holes are not going to be very deep. ... diameter and would not be surprised if smaller ones were...
Hi Brian I have another idea. Can you tell me whether each hole needs to be the same depth? Also, roughly what depth are you aiming for. And finally, what...
I assume you have thought of a slider pot (as opposed to a rotary pot). They typically have a travel around 90mm (well, the one I am holding does) and there...
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