Feeds

Chap builds rotary dial mobile phone

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

Choosing a cloud hosting partner with confidence

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. ®

Internet Security Threat Report 2014

More from The Register

next story
Hi-torque tank engines: EXTREME car hacking with The Register
Bentley found in a hedge gets WW2 lump insertion
What's MISSING on Amazon Fire Phone... and why it WON'T set the world alight
You fought hard and you saved and earned. But all of it's going to burn...
Trousers down for six of the best affordable Androids
Stylish Googlephones for not-so-deep pockets
Download alert: Nearly ALL top 100 Android, iOS paid apps hacked
Attack of the Clones? Yeah, but much, much scarier – report
Fujitsu CTO: We'll be 3D-printing tech execs in 15 years
Fleshy techie disses network neutrality, helmet-less motorcyclists
prev story

Whitepapers

Go beyond APM with real-time IT operations analytics
How IT operations teams can harness the wealth of wire data already flowing through their environment for real-time operational intelligence.
Why CIOs should rethink endpoint data protection in the age of mobility
Assessing trends in data protection, specifically with respect to mobile devices, BYOD, and remote employees.
A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.
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.
Protecting against web application threats using SSL
SSL encryption can protect server‐to‐server communications, client devices, cloud resources, and other endpoints in order to help prevent the risk of data loss and losing customer trust.