bare esentials for minipov to work ?

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jasonx
 
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bare esentials for minipov to work ?

Post by jasonx »

I bought my MiniPov kit for for IR capture http://forums.adafruit.com/viewtopic.php?f=23&t=4890 for another project I'm trying to figure out
And like it so much I want to make another one for use on my bicycle as a rear light using the cylon firmware http://forums.adafruit.com/viewtopic.php?f=11&t=12999
I would like to remove as much as I can and have it still function would this work ?
could I also remove D3 ? or have I already removed to much ?
I can pre program the avr in my kit minipov
Image
Idealy I would like to cram it on to a single sided pcb to fit in to a 4 AA case like the tv b gone below
Image

mtbf0
 
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Re: bare esentials for minipov to work ?

Post by mtbf0 »

without the programming part of the circuit you probably just want to pull reset high with a 10k ohm resistor to vcc.

jasonx
 
Posts: 168
Joined: Wed Jan 16, 2008 5:41 pm

Re: bare esentials for minipov to work ?

Post by jasonx »

mtbf0 wrote:without the programming part of the circuit you probably just want to pull reset high with a 10k ohm resistor to vcc.
Thank you I will give that a try :D

jasonx
 
Posts: 168
Joined: Wed Jan 16, 2008 5:41 pm

Re: bare esentials for minipov to work ?

Post by jasonx »

I finally got around to breadboarding the circuit like you suggested with a 10K ohm resistor to vcc and it works great :D
It also works without it as I forgot to add a link from the resistor to vcc :roll: the first time I tried it.
As it works without the resistor can I leave out or will it cause problems ?

http://www.youtube.com/watch?v=bc_9E89BYOc

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opossum
 
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Re: bare esentials for minipov to work ?

Post by opossum »

There is an internal resistor on the reset pin, so an external is not necessary (usually).

jasonx
 
Posts: 168
Joined: Wed Jan 16, 2008 5:41 pm

Re: bare esentials for minipov to work ?

Post by jasonx »

Thank you again :D

jasonx
 
Posts: 168
Joined: Wed Jan 16, 2008 5:41 pm

Re: bare esentials for minipov to work ?

Post by jasonx »

Can anybody see any silly mistakes in this single sided pcb layout ? this will be a at home toner transfer job
Image
It looks the same as I have running on a breadboard I think :?
If I know it's good I will tidy it up a bit and try to shrink it a bit more

jasonx
 
Posts: 168
Joined: Wed Jan 16, 2008 5:41 pm

Re: bare esentials for minipov to work ?

Post by jasonx »

woo it works
Image
I will have to rethink my case idea though the high power led's have a fat leg
Image

mtbf0
 
Posts: 1645
Joined: Sat Nov 10, 2007 12:59 am

Re: bare esentials for minipov to work ?

Post by mtbf0 »

maybe you could go for a common anode configuration on the leds so the fat leg will be the one connecting nearer the middle of the board. just cut the connection from your battery - to the ground trace and solder a wire to it from battery +, then modify the firmware so that just before you output something to PORTB you xor it with 255.

advantage, no rerouting, fits case. disadvantage, ugly board, firmware mods. also easy to reroute if you want to.

other idea. bring the ground traces in from the edge of the board so that the legs of the leds connect next to each other parallel to the long edge. put a little piece of heat shrink on the anode where it crosses the ground trace.

advantage, pretty(?) board, no firmware mods, fits case. disadvantage, lots of rerouting.

jasonx
 
Posts: 168
Joined: Wed Jan 16, 2008 5:41 pm

Re: bare esentials for minipov to work ?

Post by jasonx »

Thanks :D
I ended up taking the easy route :roll: and removing the wall between the board and battery
It just fits now

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