Feeds

Chap builds rotary dial mobile phone

Hipsters rejoice ... until you need a handset for a good slam-down hang-up

Boost IT visibility and business value

If you miss the whirr-and-thunk of a rotary dial, you could download an app that imitates the rotary dialler, or you could make your own mobile with a rotary dial.

For those that prefer something a little more physical, this Hackaday project should keep you busy with the soldering iron: a real rotary dialler (with appropriate interface to a GSM module for the phone) as a DIY.

It was created as a competition entry for the NXP LPC810 Challenge, which asked entrants how much they can get out of an ARM Cortex M0+ microcontroller – one that only has an eight pin package.

With so little available to control a GSM module, the project's author “Jaromir” had to handle I/O. As he writes at his blog, it's “not that complicated”. He used a UART and “a few I/O lines”, and spent a lot of time writing a “decent parser of AT commands – that can be [a] nightmare”.

A 74HC164 shift register cut the required number of pins down from the 12-16 needed to the six lines available from the microcontroller. These six I/O lines handle the input from the rotary dial, output to the display, and a serial line to the GSM module.

As Hackaday notes, it's “a somewhat impressive demonstration of using a shift register as both an input and output expander at the same time”.

Still on his to-do list are things like toggling the DTR line, a power-save mode, and a CLIP function to display a caller's ID.

Here's a video of the rotary dialler in action:

Youtube Video

Jaromir has published the hardware design files on his site, with the software at github here. ®

The essential guide to IT transformation

More from The Register

next story
Top Gun display for your CAR: Heads-up fighter pilot tech
Sadly Navdy kit doesn't include Sidewinder missile to blast traffic
FEAST YOUR EYES: Samsung's Galaxy Alpha has an 'entirely new appearance'
Wow, it looks like nothing else on the market, for sure
YES YES YES! Apple patents mousy, pressure-sensing iVibrator
Fanbois prepare to experience the great Cupertin-O
TV transport tech, part 1: From server to sofa at the touch of a button
You won't believe how much goes into today's telly tech
NVIDIA claims first 64-bit ARMv8 SoC for Androids
Mile-High 'Denver' Tegra K1 successor said to rival PC performance
XBOX One will learn to play media from USB and DLNA sources
Hang on? Aren't those file formats you hardly ever see outside torrents?
Giving your old Tesco Hudl to Auntie June? READ THIS FIRST
You can never wipe supermarket slab clean enough
Intel admits: Broadwell Core M chip looking a bit thin, no fans found at all
Chipzilla's 'cool' 14nm part to hit market this year
prev story

Whitepapers

Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Solving today's distributed Big Data backup challenges
Enable IT efficiency and allow a firm to access and reuse corporate information for competitive advantage, ultimately changing business outcomes.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.