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bare esentials for minipov to work ?
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bare esentials for minipov to work ?

by jasonx on Wed Feb 17, 2010 4:21 pm

I bought my MiniPov kit for for IR capture 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 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
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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
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Re: bare esentials for minipov to work ?

by mtbf0 on Wed Feb 17, 2010 6:04 pm

without the programming part of the circuit you probably just want to pull reset high with a 10k ohm resistor to vcc.
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Re: bare esentials for minipov to work ?

by jasonx on Wed Feb 17, 2010 8:01 pm

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
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Re: bare esentials for minipov to work ?

by jasonx on Sat Feb 27, 2010 1:31 pm

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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Re: bare esentials for minipov to work ?

by oPossum on Sat Feb 27, 2010 8:47 pm

There is an internal resistor on the reset pin, so an external is not necessary (usually).
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Re: bare esentials for minipov to work ?

by jasonx on Sun Feb 28, 2010 6:41 am

Thank you again :D
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Re: bare esentials for minipov to work ?

by jasonx on Mon Mar 01, 2010 8:32 pm

Can anybody see any silly mistakes in this single sided pcb layout ? this will be a at home toner transfer job
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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
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Re: bare esentials for minipov to work ?

by jasonx on Sat Mar 06, 2010 2:13 pm

woo it works
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I will have to rethink my case idea though the high power led's have a fat leg
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Re: bare esentials for minipov to work ?

by mtbf0 on Sun Mar 07, 2010 9:58 am

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.
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Re: bare esentials for minipov to work ?

by jasonx on Sun Mar 07, 2010 5:11 pm

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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