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<houkime> Joerg-Neo900, I couldn't find any details on proximity sensor for stylus detection in whitepapers.
<houkime> Joerg-Neo900, and in stuff also for that matter
<houkime> Joerg-Neo900, what i want to know is allowed wavelength range, power consumption and calculations for aperture diameter in LOWER.
<houkime> the position of the stylus bay i can calculate from the wpwrak's scans myself.
<houkime> Joerg-Neo900, i have little idea now about bay wall reflection spectrum.
<DocScrutinizer51> houkime: I'm sorry for missing details in whitepaper. Wavelength is irrelevant, Appertures (plural) size depends on sensor design, the idea I tried to
<houkime> can't one have only one aperture (via hanging sensor from the lower side of the UPPER?)
<DocScrutinizer51> sketch yesterday is: sensor sends throuch one apperture and receives through a second. Both appertures get "shu" by stylus
<DocScrutinizer51> shut
<houkime> ok, so two apertures are for led and detector itself. got it
<DocScrutinizer51> purpose of proto_v2 is (among other) to verify functionality of this design
<houkime> so what we are looking for here is very narrow angle for emitting LED, almost a laser-like thing, Otherwise it will illuminate LOWER and the integrated reflection power from LOWER will be much greater than from a tiny aperture.
<houkime> or rather, one should look at detection and LED emission cones, make sure that they intersect well at the depth of the bay
<houkime> and then make an artistic orifice based on these cones in LOWER
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<houkime> which might turn out to be either 2 separate orifices or one merged.
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<houkime> TMD49033 looks nice. It is multi-wavelength and can detect color. Same footprint as other TMDs which we already have. 1.8v all across.
<houkime> but it doesn't have a datasheet. though knowing ams it is probably included in TMD49031 datasheet or sth
<houkime> checking
<Joerg-Neo900> houkime: the sensor was planned to get mounted onto S2 looking *down*ward through apperture un PCB S1-S2
<Joerg-Neo900> the idea is to have receiver optically separated from LED when some object sits on surface S1
<houkime> Joerg-Neo900, separation is not necessary since this kind of sensors can measure yield and compare it with reference
<houkime> basically it measures distance by comparing integrated reflection
<Joerg-Neo900> go ahead as you think works best
<Joerg-Neo900> just keep in mind this sensor is always-on and thus will have massive impact on battery standby time
<Joerg-Neo900> it should have active supply current <1mA
<Joerg-Neo900> ideally <<1mA
<Joerg-Neo900> average
<Joerg-Neo900> if it doesn't "out of the box", you might need to define a sort of "polling" scheme driven by CPU that enables sensor every 5s for 0.01s or whatever
<houkime> Joerg-Neo900, the number of pulses per measuring act is programmable and less pulses are needed for smaller distances
<houkime> Joerg-Neo900, they don't need polling because they have a configurable interrupt pin
<houkime> Joerg-Neo900, though to configure it one probably needs to calibrate it and then write needed values into i2c registers
<Joerg-Neo900> as I said: >>if it doesn't "out of the box", you might need ...<
<houkime> Joerg-Neo900, well, it technically doesn't work out of the box)) it needs calibration ad experiments.
<Joerg-Neo900> initializing is "OOTB"
<houkime> ok
<Joerg-Neo900> just needs to run autonomously after that, with a supply current average <<1mA
<Joerg-Neo900> funny little detail that even works for N900: insering a lamba/4 antenna into stylus bay will massively improve FM TX ;-) the antenna is parallel to stylus and would get coupled to such l/4
<Joerg-Neo900> re stylus sensor, I also pondered mechanical switch (EEEWW!) and even capacitive "touch" sensor directly to a GPIO pin that senses statical charge movement in stylus plastic and change in capacitor value of the sensor pad to verify status inserted/removed
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<houkime> alas. In stock on Digikey but no datasheet on the ams website after all. Such a mess.
<houkime> going to next candidate.
<DocScrutinizer51> bydy, its a PITA
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<DocScrutinizer51> btdt even
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<houkime> datasheet is present though on alldatasheet.com
<houkime> need to check remaining other candidates regardless
<houkime> though all these sensors are so expensive... 5-6 dollars for a proximity thing. oh man...
<Joerg-Neo900> prohibitive pricing
<houkime> it might be even better idea to have led and sensor separate at this point and sensor just have a programmable interrupt on too much/too little light.
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<Joerg-Neo900> rule of thumb: sourcing * 3, so almost 20$ for stylus sensor isn't a selling point
<Joerg-Neo900> those reflexive lightbar sensors were always a PITA
<Joerg-Neo900> prolly there are more sensor concepts where LED is separate component
<Joerg-Neo900> I see soap dispensers with lightbar, sold for like 8 bucks
<houkime> due to small distance needed in neo900 led could be so weak that it can be just always on wherever phone is on.
<houkime> so no flashing circuitry or whatever.
<DocScrutinizer51> duh, that would cause at least 0.5 to 1mA
<DocScrutinizer51> and sensing unmodulated light level is a nogo regarding noise rejection and reliability
<Joerg-Neo900> if you really wanna go that route, you need a LED controlled by a CPU GPIO to pulse it with a duty cycle of <0.001% and detect the pulses on a A/D converted photodiode. Nasty but feasible
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<Joerg-Neo900> even I would opt against that stylus detection feature based on this concept. But in the end it's your design now
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<Joerg-Neo900> "even I" since I'm notorious for my featuritis
<clapont> hi everyone
<Joerg-Neo900> hi
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<houkime> SI1151-AB00-GM looks kinda nice compared to ams stuff.
<houkime> 1.8 bucks
<houkime> no integrated LED but LED driver instead
<houkime> interrupt pin, all things programmable
<houkime> 1.8v all across (excluding LED which has separate power) possible
<houkime> and the LED can be basically just any LED under 5.5v
<houkime> both visible and IR
<houkime> maximum sensitivity in blue area
<houkime> so it is bring_your_own_LED proximity sensor thing
<houkime> it also configurably limits LED current
<houkime> though maybe 1.8 bucks + LED is still a bit much.
<houkime> Joerg-Neo900, what do you think?
<houkime> should look cool though if optical - you can probably look in the hole and see it blinking.
<houkime> if duty cycle and measurement pulses count permit that is)
<houkime> it has autonomous mode, so you just set up a timer via i2c and it measures every now and then.
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<Joerg-Neo900> sounds excellent, price is bearable. I suggest blue LED then, best efficiency, power LED from VBATT_SWITCHED
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