libera/#neo900/ Monday, 2019-08-12

houkimeTMD26713 "stylus detect" optical proximity sensor isobsolete22:08
houkimewhat to do with it? Is it critical for n900 software compatibility?22:09
houkimeif not one can just upgrade it. If it is, what interface exactly is needed fom sensor to be compatible?22:10
Joerg-Neo900>>Is it critical for n900 software compatibility<< no, it's a Neo900 bonus feature22:11
Joerg-Neo900implement as you see fit22:12
Joerg-Neo900took a while til we found that sensor22:13
houkimeams has newer similar models.22:13
Joerg-Neo900interface is overkill22:13
houkimedoesn't seem to be a problem.22:13
houkimeok, will just choose a similar part but newer from the same manufacturer22:14
Joerg-Neo900optical design is critical22:14
houkimebtw where it should go exactly?22:14
Joerg-Neo900the idea is stylus interrupts optical path22:15
houkimeis there a hole in the case or sth which it should be under?22:15
Joerg-Neo900we covered it somewhere in whiteoaoers22:15
Joerg-Neo900papers22:15
houkimeok, will look up22:16
Joerg-Neo900and in stuff22:16
Joerg-Neo900it looks though apperture in PCB22:16
Joerg-Neo900refelction of beam on other wall of empty stylus bay. With stylus inserted path is blocked22:17
houkimeTMD26721TR-ND seems almost identical (and same wavelength)22:21
Joerg-Neo900sensor sits on S2 above stylus looking down through PCB hole S2->S1->stylusbay|reflector|stylusbay->S1-[2nd PCB hole]->S1->sensor-RX22:22
Joerg-Neo900check range22:22
Joerg-Neo900needs to deal with range <10mm22:22
Joerg-Neo900or 1522:23
Joerg-Neo900and needs ultralow supply current since always-active22:23
Joerg-Neo900if those requerements can't be met, rather use a mechanical switch or omit stylus sensor all together22:24
houkimeit is calibrated at 100mm but can be programmed for other distances in 255 steps.22:39
houkimeusing different number of pulses22:40
Joerg-Neo900as long as it detects a refexion of 7mm away objrct (wall of bay)...22:40

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