houkime | TMD26713 "stylus detect" optical proximity sensor isobsolete | 22:08 |
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houkime | what to do with it? Is it critical for n900 software compatibility? | 22:09 |
houkime | if 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 feature | 22:11 |
Joerg-Neo900 | implement as you see fit | 22:12 |
Joerg-Neo900 | took a while til we found that sensor | 22:13 |
houkime | ams has newer similar models. | 22:13 |
Joerg-Neo900 | interface is overkill | 22:13 |
houkime | doesn't seem to be a problem. | 22:13 |
houkime | ok, will just choose a similar part but newer from the same manufacturer | 22:14 |
Joerg-Neo900 | optical design is critical | 22:14 |
houkime | btw where it should go exactly? | 22:14 |
Joerg-Neo900 | the idea is stylus interrupts optical path | 22:15 |
houkime | is there a hole in the case or sth which it should be under? | 22:15 |
Joerg-Neo900 | we covered it somewhere in whiteoaoers | 22:15 |
Joerg-Neo900 | papers | 22:15 |
houkime | ok, will look up | 22:16 |
Joerg-Neo900 | and in stuff | 22:16 |
Joerg-Neo900 | it looks though apperture in PCB | 22:16 |
Joerg-Neo900 | refelction of beam on other wall of empty stylus bay. With stylus inserted path is blocked | 22:17 |
houkime | TMD26721TR-ND seems almost identical (and same wavelength) | 22:21 |
Joerg-Neo900 | sensor sits on S2 above stylus looking down through PCB hole S2->S1->stylusbay|reflector|stylusbay->S1-[2nd PCB hole]->S1->sensor-RX | 22:22 |
Joerg-Neo900 | check range | 22:22 |
Joerg-Neo900 | needs to deal with range <10mm | 22:22 |
Joerg-Neo900 | or 15 | 22:23 |
Joerg-Neo900 | and needs ultralow supply current since always-active | 22:23 |
Joerg-Neo900 | if those requerements can't be met, rather use a mechanical switch or omit stylus sensor all together | 22:24 |
houkime | it is calibrated at 100mm but can be programmed for other distances in 255 steps. | 22:39 |
houkime | using different number of pulses | 22:40 |
Joerg-Neo900 | as long as it detects a refexion of 7mm away objrct (wall of bay)... | 22:40 |
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