Feeds

Chap builds rotary dial mobile phone

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

Reducing security risks from open source software

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. ®

Securing Web Applications Made Simple and Scalable

More from The Register

next story
Child diagnosed as allergic to iPad
Apple's fondleslab is the tablet dermatitis sufferers won't want to take
Microsoft takes on Chromebook with low-cost Windows laptops
Redmond's chief salesman: We're taking 'hard' decisions
For Lenovo US, 8-inch Windows tablets are DEAD – long live 8-inch Windows tablets
Reports it's killing off smaller slabs are greatly exaggerated
Seventh-gen SPARC silicon will accelerate Oracle databases
Uncle Larry's mutually-optimised stack to become clearer in August
EU dons gloves, pokes Google's deals with Android mobe makers
El Reg cops a squint at investigatory letters
Big Blue Apple: IBM to sell iPads, iPhones to enterprises
iOS/2 gear loaded with apps for big biz ... uh oh BlackBerry
prev story

Whitepapers

Reducing security risks from open source software
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Consolidation: the foundation for IT and business transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.