Justine Haupt (Justine Haupt) developed open cell phone with rotary dialer. She was inspired by the idea of ββliberation from the ubiquitous flows of information, because of which modern man is mired in tons of information he does not need.
The convenience of using a phone without a touch screen was at the forefront, and therefore its development may show features that are not yet available to many of today's smartphones:
- The presence of a removable SMA-antenna, with the ability to replace it with a directional one, for using the device in areas with difficult reception of a cellular network.
- The call is made much easier and faster than using a standard touch interface - there is no need to go through the menu.
- There is a βspeed dialβ function, as in the push-button dialers we are used to - numbers can be tied to physical buttons for quick calls.
- The signal level and battery charge are shown on the LED indicator.
- The built-in screen is made using e-ink technology, which does not require additional energy to display information.
- Free and open firmware - each user can easily and naturally make their own changes to it, receiving additional functions. If you know how to program, of course.
- Instead of holding the power button, the machine can be turned on with a regular physical switch.
Few characteristics:
- The device is based on the ATmega2560V microcontroller.
- The controller firmware is written using the Arduino IDE.
- To work with the cellular network, the Adafruit FONA radio module is used, the source code of which is available on GitHub. It also supports 3G.
- To display the necessary information, a flexible screen based on electronic ink was used.
- The battery level and cell signal LED indicator contains 10 bright LEDs.
- The battery holds a charge for about 24 hours of operation.
Available for download:
- Device diagram and PCB layout in KiCAD format.
- Models for printing the body on a 3D printer in STL format.
- Specifications of the used components.
- Firmware source codes.
For those who cannot print the case themselves and assemble the printed circuit board, a ready-made set of the necessary components has been prepared, which can be ordered from the author. The issue price is $170. The board can be ordered separately for $90. Unfortunately, the kit does not include a dialer, FONA 3G GSM module, e-ink screen controller, GDEW0213I5F 2.13" screen, battery (1.2Ah LiPo), antenna, connectors and buttons.
>>> Download sources and specifications
>>> Order components
Photo of the device, circuits and board: 1, 2, 3, 4, 5, 6, 7.
Photo of the author with the device
Source: linux.org.ru