got it, thanks!

Hi guys,
Sorry for a newbie question, but what's the simplest way to make an LED blink at with a certain speed ( say, 100 ms on / 400 ms off ) without arduino or anything that needs to be programmed?
I heard where where some "blinking chip" for that, where you could set the blink rate by attaching different resistors, right?

Thanks!

Thanks for the input guys. From what I learned so far, guess AD620 chip would be the best, what do you think?

Found such circuit, based on LM358N , what do you think?

Thanks for the tips! Any ideas what kind of amplifier and filters would be better?

Storage and transport environment: -5~+40℃
Operating temperature: 0~+40℃
Humidity
Operating/Storage/Transportation 0% to 80% non condensing Altitude
Hyperbaric Pressure 86kPa～106kPa
Biocompatibility: All patient contact materials are latex free and have been tested


Lead wires
Low profile, insert molded snap or pinch connectors offer patient comfort and secure attachment to snap electrodes. The snap termination’s ergonomic, teardrop design reduces tangling at the patient end connector. Grabber and mini clip terminations have dual sided metal contacts to provide the connection.

All data that it has. I do believe it's just a screened off wire, nothing more.

I do believe it's just a standard ECG wire with a standard disposable electrode. Isn't it?

I just ordered and will receive them in a few days. So I thought maybe someone already has experience is this field and knows how it should be done.

Well, yes, there are multiple electrodes ( for a holter monitor, usually 3-7 ) stuck to a patient... in this case, I want Arduino get reading from this electrodes and pass it over to a bluetooth module, which will pass then to a smartphone.

So the question is - should leads from this electrodes go to Arduino's input pins, or should there be something in between, like an amplifier or something?

Thanks.

I want to plot the whole ECG and transfer it via bluetooth to a smartphone, that would analyze it and draw the waveform on screen.

Hi guys,
I'm looking to make a simple ECG based on Arduino, but I'm not really sure, do I need some sort of an amplifier chip between arduino and the leads? or can I just connect the leads to the arduino's inout pint?

Thanks.