Re: Cheapest object sensor on the market!

raedarrar wrote:
Ok, let me see if i understood! There are 2 options;

Option 1: How much would this cost?


You'd have to price it out.


"Look around for other uC. As I mentioned before one option would be to
use on-chip comparators and a kind of "touch key". You'd set the touch key
to VCC/2 via two 18M resistors or thereabouts, then from there to the comp
input via another 1M (for some ESD protection). The other input of the
comp would get an RC filtered PWM from the timer. You'll have to detect
excursions in either direction because you won't know the charge polarity
of an approaching hand. Just a thought, try it out."


Option 2: Lets see if i have added it up correctly assuming will have
these changes and getting a fair prices for 100Ku!

.15 PCB - Consider moving from FR4 to phenolic.
.40 Micro - Asian products with 4-bit coding.
.25 ASIC - Power managements for LCD drivings
.25 uC
.10 Battery - I believe getting this price for @100Ku

Of what i have understood, using either Micro or (ASIC + uC) right?? or
using all of the above?


It's either uC or ASIC, not both. And as Linnix mentioned, don't forget assembly. The ASIC will require some six-digit NRE which has to be amortized over a few years and thus added to the cost. The uC will take lots of searching, negotiating, someone has to program it and that person should preferably understand Japanese or Chinese, depending on where you buy the uC from. And ideally be able to communicate in that language over the phone as well.

--
Regards, Joerg

http://www.analogconsultants.com/
.

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