Changes between Initial Version and Version 1 of MiniPOV


Ignore:
Timestamp:
Nov 8, 2013, 10:17:54 AM (6 years ago)
Author:
hazen
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • MiniPOV

    v1 v1  
     1See [http://edf.bu.edu/pov/ POV]
     2
     3[[USB-POV_Test_Log]]
     4
     5=== PC Boards ===
     6
     7New design fabricated Nov 2011.  Works ok so far, USB not tested.  Tilt sensor orientation needs work.
     8
     9* [http://ohm.bu.edu/~hazen/USB_POV/USB_POV.sch USB_POV.sch]
     10* [http://ohm.bu.edu/~hazen/USB_POV/USB_Pov.pcb USB_Pov.pcb]
     11
     12=== To Do ===
     13
     14* Add jumper to select bootloader
     15* Change tilt sensor orientation
     16
     17=== USB Version ===
     18
     19The major disadvantage of the MiniPOV3 is that it requires a serial port.  A new version could be made which is USB-only using a special boot loader.  The  USBAspLoader (below) seems like a great candidate.
     20
     21* [http://www.obdev.at/products/vusb/index.html V-USB]
     22* [http://www.obdev.at/products/vusb/usbasploader.html USBAspLoader]
     23* [http://www.fischl.de/usbasp/ USBasp]
     24
     25Some observations:  12MHz xtal-based clock is best option at 3.3V.  ATMega88 et al can officially run at 12MHz above 3.06V.  At this voltage also, the USB interface is simplified as the zener diodes can be omitted.  So the minimal hardware is similar in parts count to the MiniPOV3:  fewer parts for the computer interface, but add two caps and xtal.
     26
     27
     28
     29=== PCB Costs ===
     30
     31* Miniboard service (3 x 3, 9 boards, $85).  $9.44/board
     32* ProtoPro service (21 in^2, 4 boards, $166).  Can fit 6 boards, so $7.37/board.
     33* Production (12x14) with 45 boards, 2 boards (total 90 pcs) at $4.22/board
     34
     35=== Tilt Sensor ===
     36
     37Here are some ideas/code for adding a tilt sensor to trigger the display when
     38you wave the device.
     39
     40* [http://forums.adafruit.com/viewtopic.php?f=11&t=7103&p=49569&hilit=sensor#p49569 Forum thread]
     41
     42We tried a cheap ball-type tilt sensor, and it was not reliable enough.  Another idea is an optical tilt sensor, such as one made by OncQue (Mouser stocks some, i.e. OncQue# RBS330301).
     43