A Reddit user has built a computer that is roughly the size of a credit card and only about 1mm thick. The builder, known as krauseler, described it as a fully self-powered computer in actual credit-card size.
DIY builder uses ESP32-C3FH4 SoC
The device is based on the ESP32-C3FH4 system-on-chip, which includes Wi-Fi and Bluetooth LE connectivity. It also features NFC, a 1.54-inch 200×200 e-ink display, an accelerometer, and an ultra-thin lithium polymer battery. The custom flexible PCB was etched as part of the build.
The builder has outlined future plans for the device, which include adding GPIO pins, a caseless USB-C port, a microSD slot, and wireless charging. Some commenters noted that the term 'self-powered' may be inaccurate without solar or other external energy sources, and the builder agreed that 'wireless' might be a more accurate description.
The project was shared on Reddit and later covered by Techspot. The builder has not confirmed a launch window or any plans for commercial availability.
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