Magic POV for text rendering – a toy for ALL
POV
is short from Perception Of Vision. Our perception is
sometimes so slow, that we can see things that do not exist. This toy is one of
many example of that
it is so! Also you can do it yourself. Below is an design plan which consist of
schematic circuit design, printed circuit board design (short PCB), parts list
and program for
PC, with wchich you can upload the text you want to
your toy through serial interface of your PC. If you do not have serial port
RS232, you can purchase USB to RS232 converter for cheap in the nearest PC
shop. Also with this program you can select text rendering mode, you can see
more details about it below at photographs ( sorry for
the quality of photos – I take it with my phone camera).
POV text rendering
device – its pretty small device, you can mount it to your bike wheel
Schematic circuit – click
on it to enlarge it
Micro push buttons SW1 and SW2 description:
Button SW1 is Power On
button and RESET button – with this button you switch to default rendering mode
set with PC program. Button SW2 is more interesting, because with this button
you can switch the text rendering mode without PC help. Everywhere and every
time you want to switch text rendering mode, you can use this button. This POV
has 11 rendering modes. Button SW2 is switching between modes, but when you go
around all modes at the end is Power Off.
Or simple: if you push
12 times this button, then
POV device switch off.
When you connect POV to
PC via simple 2 wires serial cable, be sure that pin 6 and pin 7 are connected
together. If this not connected, then program doesn’t works.
Parts list
1x (D1) diode eg. 1N4007 or similar for protective function when battery is connected conversely
2x (D2-D3) Schottky diode eg. BAT42 or similar
11x (D4 – D14) Bi-Color
LED diodes (see schematic picture above) eg. type KINGBRIGHT L-937
1x (Q1) NPN
transistor with min. Colector-Emitor current 500mA eg. type
BC639 or similar
1x (Q2) PNP transistor with min. Colector-Emitor
current 500mA eg. type BC640 or
similar
2x (R1-R2) standard metallised
miniature resistor 3.3kOhm, 0.250W
1x (R3) standard horizontal trimer ( trimer
= resistor with variable resistance ) 100kOhm
4x (R4-R7) standard metallised miniature resistor 10kOhm, 0.250W
1x (C1) ceramic capacitor
22pF with pin distance 5mm
1x (C2) ceramic capacitor
100nF with pin distance 5mm
1x (C3) electrolytic
capacitor 100μF / min. 6V or higher, with pin distance 2.5mm
1x (SW1-SW2) micro push
button
1x (J1) optional
connector Cannon DB9 (DE9) female 9 pin – for connecting POV device to PC
1x (U1) the most
important part – microcontroller Microchip PIC16F628A
,
when you want this microcontroller with firmware, then you
have to order at blikacka@gmail.com
Cost per programmed PIC 16F628A with firmware is 5.99€ + postage.
PCB dimensions 60
millimeters x 50 millimeters
300DPI
!!! for 1:1
printing or download it SCHEMATIC_PCB
(created with ExpressPCB
and ExpressSCH)
Program for writing text
through serial COM port RS232 to POV device, its freeware and you can download
it here:
DOWNLOAD IT ALL (program,
schematic, pdf, PCB) *.ZIP
Gallery of photographs
Only red mode
Only green mode
Random change for each
letter mode
Negation + alternating
colors mode
For each word + waves
mode
For each letter mode
For each part of letter
mode
Bike wheel in action 1
Bike wheel in action 2
Bike wheel action 3
Bike wheel action 4
Bike wheel action 5
Bike wheel action 6
Bike wheel action 7
Bike wheel action 8
Bike wheel action 9
Bike wheel action 10
Bike wheel action 11
That’s all! If you want
more details or if you want to order microcontroller PIC16F628A please send me
an email to:
Matej Baran © 2009
