Outils pour utilisateurs
Table des matières
PiCam
Tilt-Pan autonomous camera for timelaps acquisition based on a Raspeberry-pi.
Concept
The first prototype proved the feasibility. It was based on a tilt-pan module (2x SG90 micro-servo) + raspberry-pi camera v1 with CS lens mount.
http://imagizer.terre-adelie.org/2016-08-02-Vesteralen/page3/22h23m39-NIKON_D5100.jpg
Some resulting videos are: http://video.terre-adelie.org/2016/2016-08-04-Melbu/video_4.mp4
Basis
The new basis is made of 9x9mm beech wood sticks (hetre) + 3d printed basis, RPi holder and servomoter holder. The scheme is available and here is a photo … http://imagizer.terre-adelie.org/2016-11-06/11h02m45-NIKON_D800.jpg
PWM generator
“Servo Pi - PWM Controller” from Kubii, actually a PCA9685 PWM I2C controler, 16 channels, 12 bits each (4096 values).
Panorama servo
DSS-M15S from DFRobot.
PWM frequency: 300 Hz,
| valeur | deg | ||
| 525 | 98 | ||
| 550 | 97 | ||
| 600 | 90 | ||
| 700 | 80 | ||
| 800 | 69 | ||
| 900 | 59 | ||
| 1000 | 48 | ||
| 1100 | 38 | ||
| 1200 | 27 | ||
| 1300 | 16 | ||
| 1400 | 5 | ||
| 1500 | -5 | ||
| 1600 | -16 | ||
| 1700 | -27 | ||
| 1800 | -37 | ||
| 1900 | -47 | ||
| 2000 | -57 | ||
| 2100 | -67 | ||
| 2200 | -77 | ||
| 2300 | -87 | ||
| 2400 | -98 | ||
| 2500 | -108 | ||
| 2600 | -119 | ||
| 2700 | -130 | ||
| 2800 | -140 | ||
| 2900 | -150 | ||
| 3000 | -160 | ||
| 3100 | -171 | ||
| 3200 | -180 | ||
| 3300 | -190 | ||
| 3350 | -195 |
Those are raw values. PWM values needs to be converted in µs (300Hz, 4096 steps …) but the data look rather linear which is great. To simplify, we have a linear behavour:
| Timing | angle | ||
| 420 µs | 98° | ||
| 2710µs | -195° |
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