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Edrum Optical Hi-Hat Pedal
This is the second Hi-Hat Pedal I made for my Edrum project.... I decided to build this one to see what difference there was with the potentiometer one... besides that this would be easy to retrofit into a prebuilt pedal or footswitch assembly... but I built the whole pedal myself anyway....
I had some plastic material I got off of another part I bought at the scrap yard, I had no use for it so I decided to use it to make a "hinge" for this pedal....I sketched a "heel" shape on it with a marker and roughcut it with a bandsaw....
I managed to get both pieces of the "hinge" from the same piece of plastic material.... I drilled a 1/8" hole through both pieces where they interconnect and pinned it with a stainless rod....
I then cut some of the aluminum diamond plate I had laying around in my "just in case" pile.... I cut it in 2 pices the shape of a shoe... I then attached those with some countersunk 10-32 machine screws to the plastic material (I believe it is Nylon)....
I found the perfect spring to use in the shop, and just happened to have some rubber bushings that have a groove in them that fits the ends of the spring, I attached those to the pedal to secure the spring in between the foot plate and the base (The base is made form a piece of .125 (1/8") aluminum plate)
I had the black piece of plastic laying around in my "just in case" pile of spare "parts", it was from a flatbed scanner's imaging device. The white piece of pplastic with holes in it is from some parts I didn't use that came with some window blinds that we had bought a while ago, I knew these would come in handy for something beside robot sensor mounts...lol.

I cut a slot for it to pass through into the black plastic when the pedal is pressed.... this will be used to block the light from the LED later on...

Now onto the electronics part of it...
I decided to build the circuit on a piece of perf board, the circuit I used is the same as the one posted on the main Edrum site. I used a SUPER bright red LED from an optical mouse (the mouse didn't work, but the LED still did!!) I also had several CDS photocells laying in one of my small parts bins....

I ended up putting some heat shrink tubing around the lLED to "contain" the light more, since it was so bright, I did not want it to affect the CDS even if the pedal was pressed, since the LED lit up the inside of the casing pretty well!
As you can see the LED is pretty bright, but with the help of the shrink tubing, I managed to confine the LED's light into a small round circle onto the CDS photocell...

Now to fit it into the housing on the pedal....
I secured the circuit board in place with hot glue after lining everything up neatly inside the housing.... when the pedal is pressed down, the "tab" blocks the CDS perfectly, and I get a nice variable anlog output from it when it is slowly closed.... the 2 screws holding the spring in place also prevent the pedal from going down too far to break the plastic tab, actually it stops it right before the tab even touches the circuit board.... Now that it is all wired up, just need a small piece of ABS plastic to close up the housing unit...


After doing some test with both potentiometer based, and optical based circuits, I seem to like the way the potentiometer responds than the optical one, I don't know if the LED I used is too bright, but I seem to get better response from the pot... so I am going to try anothe LED, and see how that works... more soon....



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