The Nokia 1680 classic is a simple button cell phone released in 2008, when smartphones began to emerge. Calling, receiving and sending SMS, etc. functions, but only on 2G mobile networks. However, a hardware hacker and enthusiast under the alias Remu NotMoe has managed to turn a simple “dialer” into a full-fledged Linux PC. He named the project Notkia.

And so he created a special circuit board made up of CPU, memory and other components. Instead, the keyboard is pretty original. The board is equipped with a single core MIPS Ingenic X100E processor running at 1 GHz, 64 MB RAM, 32 MB NOR flash memory and 4 GB SLC NAND flash memory.

Although the screen is too big for the body, it has a 2-inch IPS display with a resolution of 240×320 pixels. As a result, the apparent screen resolution is 220 × 280 pixels – the edges are not visible.

Among other features of Notkia, we note the following:

• USB Type-C port;
• 5MP Waveshare OV5640 camera with autofocus;
• Yamaha MA-3 music synthesizer (with ringer support);
• analog MEMS microphone;
• AMPAK adapter with Wi-Fi 4 and BT 4.0 LE;
• Semtech SX126x LoRa receiver;
• battery BL-5C.

All this works under Linux control, including text input using the original numeric keypad. T9 technology is also supported. The device can be used as a computer, radio or modem. But Notkia does not know how to make phone calls. The fact is that Remu NotMoe did not find a fairly compact 4G LTE module. The schematics, components, list and design process that the author describes on Hackster and Hackday. In the future, the author promises to open the source code of the firmware. Source