We got in our lithium battery 'charger' that we ordered this week. Although
we dont plan to implement this piece til the end, we though ahead and realized
that most users of our device may not have an easy wasy to charge their product
unless we provide them with a hookup. The module we purchased connects via usb
and regulates current to the the lithium battery (we assume all consumers will
have access to a 5V usb jack). Tte device is the size of a small cracker. Furthermore, we still havent gotten our filter
put together, but Mustafa has been doing simulations on different filter
designs. Hopefully we get something working by next week.
After we get the filter/amplifier working, we can examine the signals that
we get and possibly use a frequency to voltage IC chip to detect frequencies
rather than our complex sampling code. Unfortunatly, the oscilliscopes in the
Elab do not have spectrum analyzers built into them (or at least nobody knows
how to find the spectrum analyer function) so we will still need to use the
existing arduino sampling code to at least harvest some data to graph and
examine.
double pole (more components, better
rolloff)
single pole, inverting and non inverting
**since our signal is bipolar, whether we invert or not doesnt matter much
unless we use a DC bias.
schematic for DC offset to an op amp
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