Hi Hat Control Jack

[EricSinger]

Roland TIP-SLEEVE

FO-infinite or more than 2M
354k
204k
156k
FC-146k4

Roland TIP-RING
147k3 always, in all the positions of pedal

[dmitri]

Roland TIP-SLEEVE

FO-infinite or more than 2M
354k
204k
156k
FC-146k4

Really bad, very high impedance for MegaDrum. Several ways around it:
1. Replace all resistors inside the pedal with resistors having values 20-30 times less.
2. Put a simple opamp buffer amplifier (voltage follower) in front of HiHat pedal input.
3. Use one of unused ADC inputs on Atmega as a dedicated pedal input. Will require me to make changes to the firmware. It will break compatibility with already built modules and will take some time to be programmed.

[EricSinger]

and with yamaha switch?? are very high impedance too? do you know roland fd-8 pedal are the same impedance that my pedal in roland switch?

[dmitri]

and with yamaha switch?? are very high impedance too? do you know roland fd-8 pedal are the same impedance that my pedal in roland switch?

Don't understand how Yamaha position works. Judging from your readings the voltage on a tip will fluctuate around half of the voltage between ring(power source) and sleeve(ground). And again, resistance values are too high. Don't know about roland fd-8 pedal, have never had one and have never seen schematics. Mine schematic is not for a Roland pedal.

The forth way around the issue is to build Admir's opto pedal controller schematic into your pedal. It has two main advantages:
1. Almost unbreakable.
2. Continuous control between open and close, not just limited number of states.

And I don't see any disadvantages apart from the fact that it won't probably work with Yamaha modules.

[EricSinger]

Yes, the admir pedal is better, but I have many difficulties to get the components like LDR, led and pedal in my town.

[dmitri]

Yes, the admir pedal is better, but I have many difficulties to get the components like LDR, led and pedal in my town.

You don't live in "Far Far Away"? I used a phototransistor instead of LDR and you can at least order it somewhere online. I can't believe you can't easily get a LED:) And you already have a pedal, don't you?:)

[EricSinger]

I live in a city called Ávila (population: 60,000) in Spain, near to Madrid (110kms). In my city there aren't electronics components shops, and the online shops in Spain are really bad. And When I go to Madrid I try to buy them, but i don't know when I will go.

[dmitri]

EricSinger, here is a test version for pedals with high output impedance:

megadrum32_20080530.zip

With a high impedance pedal, as the one you have, you need to make a couple of small changes to the schematics. In the Digital Board schematic http://www.megadrum.info/img/megadrum32.png you will need:
1. Remove R16
2. Instead of wherever it was connected to before, connect tip of HiHat input socket to pin 8 of AnalogueConnector.1

Since you're using Synthex PCB, ask his advice about what changes you need to make.

After that in the MegaDrum menu find a new setting under "HiHat Pedal" called "AltIn" and change it to Yes.
I tested it with 100k potentiometer and it appears to work fine.

[daniele99]

With the latest FW do i need to add the resistor to make FD8 workin' properly? If i remember, FD8 has a low impedance (i guess 5k or so)
Not soldered yet my inputs, i'm preventing...