Can you really make a wristwatch that is also a full-fledged synthesizer?
Inspired by the Synthwatch on Kickstarter I set out to try making one.
The playWATCH is besides obviously a clock that tells time also a real synthesizer with a 13-key capacitive touch keyboard and four real synth knobs.
It measures only 42 x 42 x 10mm with the casing a little bit taller for the wristband attachements.
It runs on a ATmega328 MCU with a 128x32 OLED for display and uses a builtin 20mm 100ohm speaker for the audio.
The battery is a 100mAh rechargeable LiPo cell and the AVR MCU have extensive use of sleep mode to make it last for weeks on a single charge.
The PCB measures 42x42mm and the Gerber files can be downloaded here.
Please mind that the ATmega chip is mounted upside down on the opposite side of the PCB.
If you are interrested in building this yourself and want a kit with the 3D-printed case and PCB, please send a message.
And the OLED is a standard 128x32 white graphic display.
The speaker is a 20mm round mini speaker. It must have an impendance of at least 100ohms to not overload the ATmega.
And the playWATCH is powered by a 100mAh LiPo battery, the largest one that will fit into the case.
For the knobs these tiny trimpots with a shaft are used.