Cheapest object sensor on the market!

More questions:

1. Is the device fixed or movable?
2. Can it use motion sensors?
3. How many digits of countings?

$3 to $5 would be doable. $1 is wishful thinking.

Ok, on & off lights is a high contrast situation, i can use it in constan light levels.

what about using it in a constant room lights, then what would be th detection distance between the hands and the device if i use an AC-couple circuit, can i determine the distance, and how far if so?

You cannot determine the distance. You can detect if someone walks by or if someone waves a hand over the sensor. You can't tune the circuit to trigger on a finer resolution than that.

No, you can drive the glass directly from the MSP430. So 0.25 for PCB,

at

This sounds like the basic theory of the ultimate sort algorithm - Arrange the objects to be sorted randomly. In at least one parallel universe, this will result in a sorted array. So the algorithm is: Arrange objects randomly. Check to see if they are in order. If not, destroy the universe.

You are right, i have already a solution from cypress, the CapSens plu

i have already called and it runs for $1.40 may be gets down to a $1 fo

there is another solution that runs for less, around $0.80 from Avago HSDL 9100-21

but i beleive will need a microcontroler that will add up at least $0.4 to the cost!

Any advices guys !!

changes)

need

1. Will be fixed.
2. Yes. this what i am looking for.
3. max. 9 votes counts, so its a 1 digit LCD.

I already have a solution that will go for &1.80 but i need a $1 sellin price as it will be a disposable item for a life span of 30 to 50 hours o use.

The cheap one does not have integrated charge pump. If you rely on constant 3V supply from a button cell, it will last only a couple of hours. LCD would be unreadable below 2.5V. Avr169 can run for a few days, as low as 1.8V, but not for under a dollar.

AC-coupled=

Ok, great, i have expressed myself wrong, then how much would you thin this will go for (100,000 units) do not forget he power source too, wha king of coin battery would it need for 30 to 50 hours on.

your

Can i use a LED that changes to a dif. colors (total of 4 colors) ever time it count a vote, would it consume less energy than LCD and b readable in sun light? are they less expensive than 1 digit LCD now days?

You would need a few mA for the LED. AVR can run with LCD for 40uA. Reflective LCDs are readable in direct sun light.

Ok, now that you have stated what you could have said in your first post.

How about an LED modulated with 40KHz. A photo-detector can detect the reflection of the 40Khz. The strength of the reflection can give a simple distance.

donald

On Apr 6, 9:51 am, "raedarrar" wrote: ...

I think I get it. It's something to detect the spammers, sporgers, off-topic cross-posters, etc. that clog up the Usenet.

JM

your

I got confused!

.25 for PCB .25 for LCD .50 for Micro ?? Batteries !!

The sensor, is this going to detect with out a sensor module and wha about the coin batteries! i need to run for at least 30 hours.

Using uC and PIR (Infra-Red heat sensor).

.20 for Battery (CR2032).

Here is a picture of an LCD in direct sunlight. The CR3032 will last about 100 hours.

We custom order them from factory. It's 12 segments x 4 commons for a total of 48 display elements.

If it has to be cheaper just make you own capacitive sensor:

I won't be nearly as good as CapSense but if there is no other choice, what can you do? Just be aware that you need to also include some kind of high pass so only fast movements trigger it. Requires lots of testing so that, for example, it doesn't react to a large mass (like a person) slowly moving in and out of the field.

PCB,

Is the $0.25 for the screen shown above? How can i demand this kind o brightness when i order one? does it have specifications?

How about using solar thick-film batteries like the ones they use on thes calculators to prolong the life of the battery. would this be a cheape option understanding that will only be used when there is lights.

Regards, Raed

We got them for 60 cents in 10Ku. Might be possible for less in

The solar cell would not be cheap, around 50 cents perhaps.