Justine Haupt an open cell phone equipped with a rotary dialer. For loading PCB diagrams for KiCad CAD, STL models for 3D printing of the case, specifications of the components used and firmware code, giving the opportunity to any enthusiast device yourself.
To control the device, an ATmega2560V microcontroller with firmware prepared in the Arduino IDE is used. A GSM module is used to interact with cellular networks with 3G support. To display information, a flexible screen based on electronic paper is used (). The battery charge lasts approximately 24 hours.
A side indicator of 10 LEDs is used to dynamically display the signal level.
For those who want to surprise others with a rotary cell phone, but do not have the opportunity to print the case and etch the printed circuit board, set of parts for assembly: case + board for $170 and only board for $90. The kit does not include a dialer, FONA 3G GSM module, eInk screen controller, GDEW0213I5F 2.13β³ screen, battery (1.2Ah LiPo), antenna, connectors and buttons.
The creation of the project was explained by the desire to get a stylish and unusual phone that would provide tactile sensations during operation unattainable for push-button and touch phones, and also allow one to justify oneβs refusal to communicate using text messages. It is noted that in the modern world of smartphones, people are overloaded with communication tools and cease to control their device.
While working on the device, the goal was to create a convenient phone, the interaction with which would be as different as possible from interfaces based on touch screens. At the same time, in some areas the resulting phone is ahead of traditional smartphones in functionality, for example:
- A removable antenna with an SMA connector, which can be replaced with a directional antenna for working in areas with poor coverage by cellular operators;
- To make a call, there is no need to navigate through the menu and perform actions in the application;
- The numbers of people who are most often called can be assigned to separate physical buttons. Dialed numbers are stored in memory and you do not need to use the dial to redial;
- Independent LED indicator of battery charge and signal level, almost instantly responding to changes in parameters;
- An e-paper screen requires no power to display information;
- The ability to change the behavior of the phone to your taste by editing the firmware;
- Using a switch instead of holding down a button to turn a device on and off.
Source: opennet.ru