- Sat Jul 23, 2016 4:13 am
#10832
I do have a question though: why bring the RPM pot output to the screw headers?
dazq wrote:I know its single sided but can you not put the uno on the back of the board to reduce its size? Else thats a lot of wasted copper board to etch...Opps. I knew the pots and the UNO was on the underside, but I didn't think about just stacking it over the tracks.
cx500tc wrote:The Uno MUST be on the back side of the board since they don't have 'stackable' headers that allow it to mount to the top. It appears on top but in reality will be on bottom. Pin headers inserted from underneath will do this.-
Old Grey wrote:To save having two boards, could you not have header pads for both the uno and the ebay 555 module? Then the builder could choose which to put on according to their needs/budget?dazq wrote:I know its single sided but can you not put the uno on the back of the board to reduce its size? Else thats a lot of wasted copper board to etch...Opps. I knew the pots and the UNO was on the underside, but I didn't think about just stacking it over the tracks.
I also forgot about soldering it on the under. It would take some tricky soldering but I think it is possible, either that or flip the UNO and put it on top with a pot in each corner on the underside for legs.
I'll have a play with it, and I might be able to get it to a 100 x 100 broad now.
The 555 is the other board I'm looking at, but I don't have an actual Speedy to check if it's going to be ok.
I'm not that keen on the oscillator on the other one because of the problems I had with it so I'm looking into alternatives. You can buy a $1.20 ready made square wave with adj duty and freq osc, but you need a multimeter to set it up before you turn it on, and that doesn't make it PnP.
PSIG wrote:I think the screw terminal connections would limit that a bit. Also, the pots take up a fair space. The one's I used are EVUF2L type and are 9mm; Old Grey's are 16mm.cx500tc wrote:The Uno MUST be on the back side of the board since they don't have 'stackable' headers that allow it to mount to the top. It appears on top but in reality will be on bottom. Pin headers inserted from underneath will do this.-
I meant underneath the pots and LEDs, like a typical shield, saving a substantial amount of board area. No reason the whole board couldn't be as small as the UNO footprint.
David
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