Project Hub /Audio Displays & Interactive Media/E-Paper Display Systems/Building Finger-Size Full Touch E-Ink Phone

Intermediate

RASPBERRY PI

Project Specific

6 – 12 Hours

Partial Kit

Building Finger-Size Full Touch E-Ink Phone

Learn how to build a miniature, full-touch, finger-sized smartphone powered by a Raspberry Pi and an E-Ink display running a Linux OS.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

Raspberry Pi 3 - Model B+ 1.4Ghz 64-bit quad-core Processor with 1 GB Ram (Original) Rs. 9,810.00
Microphone module - Analog Sound Sensor Module for Arduino Rs. 63.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: E-Paper Display
GSM / GPRS SIM800L
Speaker / Audio Amplifier
Enclosure / Box / Case

Browse all components

How It Works

This project integrates a Raspberry Pi 4 Model B running Raspberry Pi OS with an E-Ink Touch Display HAT to create a miniature, finger-sized smartphone. The system processes user inputs from the full-touch E-Ink display via a Python 3 environment utilizing communication libraries like bcm2835 and WiringPi alongside the Waveshare Touch_e-Paper_HAT repository. For audio input and output, a connected microphone and speaker handle sound processing, while a dedicated GSM module interfaces with cellular networks to enable calling and messaging capabilities. All these hardware components are housed inside a custom 3D printed enclosure, protecting the electronics while maintaining a compact, portable form factor. Power and computing tasks are managed directly by the Raspberry Pi, serving as the central processing unit running a full Linux operating system to coordinate display rendering, touch handling, audio routing, and cellular communication simultaneously.

Why Build This

Design and assemble a custom, ultra-portable Linux-based edge computing and communication device using single-board computer hardware.

Integrate disparate peripherals including E-Ink touch displays, audio components, and cellular modules into a single embedded system.

Develop practical competencies in hardware packaging, hardware-software integration, and low-power user interface design suitable for IoT applications.

Real-World Application

Portable low-power communication devices, low-strain reading and notification devices, and custom IoT edge terminals.

Skills You'll Learn

Embedded Linux configuration

Python-based hardware interfacing

E-Ink display controller integration

SPI/I2C communication protocols

cellular module integration

audio peripheral configuration

3D printed enclosure design

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Technology Tags

RASPBERRY PI

E-INK DISPLAY

LINUX

PYTHON

3D PRINTING

GSM MODULE

Frequently Asked Questions

Can I use a Raspberry Pi model other than the Raspberry Pi 4 Model B?

The project is specifically designed around the form factor and specifications of the Raspberry Pi 4 Model B, so altering the board may require modifications to the 3D printed enclosure and software configuration.

Why use an E-Ink display instead of a standard LCD or OLED?

E-Ink displays consume power primarily when refreshing the image, making them ideal for low-power portable communication devices and reducing eye strain for reading tasks.

How does the device make phone calls?

Cellular connectivity is handled by the integrated GSM module, which interfaces with the Raspberry Pi and utilizes the connected microphone and speaker for audio input and output.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

PRJ-00633