It's like the name Casper, but instead it's bits of sequencer, and ESP mashed together.
Whatever dude. It's an ESP8266 based drum sequencer.
Oh, by the way! 
by yours truly.
It's Open Source! You can find it here.
I wanted a little drum machine to jam with.
I had a ton of spare electrical parts laying around the house.
To give in idea of what those consist of:
- Home automation (somehow wanted a doorbell in HomeKit).
- Leftover guitar effects (make some noise).
- Leftover parts of a very early OTTO (hence, lots of buttons).
- Random electronic crap (that I would otherwise throw away by now).
I am a (frontend) developer, so I figured; why not make one.
sidenote: My main language is JavaScript, so cut me some slack in the C++ domain. 😉
Still busy writing this.
- ESP8266 (Other boards might work; have not tested).
- An OLED (I use a a cheap 128x64 SSD1306 OLED).
- Any I2S DAC supported by Mozzi (I got a cheap Max98357).
- Some mechanical buttons.
- A rotary encoder.
- Various general electronics like resistors and diodes.
Will follow later.
Albert - talkto@albertsm.it
Project Link: https://github.com/albertsmit/qesper