He ended up building a little doohickey that combined USB C, an LCD display, and a touch interface, all for under a buck. You can check out the video below. The key to this build was the CH32V003 CPU.

Silicon Labs has built a family of 8bit microcontrollers around its 8051-based CIP-51 core, running at 50MHz. “The BB5 family supports voltage options from 1.8 to 5.5V, allowing them to last for years ...

The 8051 microcontroller : hardware, software, and interfacing ... The 8051 microcontroller : hardware, software, and interfacing by Stewart, James W., 1946-Publication date 1999 Topics Automatic ...

Electrocardiogram (ECG) monitoring is one of the most important patient vital sign. Many design for ECG amplifier has been established. In this paper we describe a unique design of a single supply ...