Open E-Drums — Optical Hi-Hat Controller

It is newly designed hardware!

Since the circuit and the code were nearly completed, I designed the case.

Check this video.

As usual, due to lack of adjustment of the 3D printer, the surface is rough …

There is a sensor mount that can mount the TCRT 5000.

When the lid is attached, only the sensor part is exposed.

Now let’s assemble!First is the circuit. Since there are few parts, there is no board.

Decide the length of the copper wire according to the case and connect it to the TRS jack.

Refer to the image below for wiring.

TIP - 5V

RING - A0

SLEEVE - GND

It is designed so that the height of the sensor and the height of the case are aligned. In other words, the lid thickness 6 mm is the minimum distance to the sensor. Lid is fixed with M3 - 12 mm bolt.

In order to fix it on the hi-hat stand, it is designed to contain bolts. Install M3 - 25 mm bolts and nuts.

Place the sensor face down. Tighten the bolt and fix it.

It moves like a GIF below.

Here’s the problem. I tried it by connecting to arduino, but the response is bad.

Apparently, it seems that the compatibility between the felt for cymbal reception and the sensor was bad. I do not know the details, but the response is bad with black material. Even if it is white, the reaction is bad depending on the material. I do not know the standard …

I applied a masking tape to the felt and moved to a good feeling. In this regard, verification is still necessary.

Comparison with type using FSR. It got smaller a little.

Of course, unlike the FSR, the controller produced this time has no compatibility with the sound module of Roland or YAMAHA. But in the last article you can easily send signals from the MIDI terminal so you should be able to use this hi-hat controller if you send a signal to a ready-made sound module with a MIDI cable. I plan to test it.

STL data is here.

https://www.thingiverse.com/thing:2805521

Code is here.

https://github.com/RyoKosaka/drums/tree/master/arduino/tcrt5000_hihat