I’ve seen a number of PCB rulers out there however they weren't interactive. I wanted one with LED's and buttons that you could play with - so I made the DigiRule! – The DigiRule is a 15cm (6″) ruler which is marked in binary digits rather than decimal. It has a number of built in digital functions including:
Four bit binary up/down counter
The Digirule also features 8 extra hidden 'easter egg' modes:
It is powered by a single 3V CR2032 button battery and the brains of the unit is a PIC 18F43K20 microcontroller. The functions listed above are controlled by nine surface mount push buttons and has twenty three surface mount LED’s to show the status of the inputs and outputs.
The rear of the ruler contains logic gate and flip flop truth tables, a binary conversion chart, a few select SMD component footprints and some drill hole sizes.
Full details can be found on the Digirule page on my website including:
Shipping will be straight from my manufacturer in China by Singapore post and will occur on Monday, Wednesday and Friday each week. For bulk orders I recommend EMS shipping or DHL. Singapore post is cheap however it can be slow depending on where you live. Sometimes taking up to a month to arrive for some people. The CR2032 coin cell battery which is required to power the Digirule is not included due to shipping restrictions on batteries.
|Shipping Rate||First item||Additional items|
Singapore Post: Singapore Post Airmail
Shipping is direct from my manufacturer in China. Please note Singapore post tracking is not very accurate (sometimes scans are missed at certain locations). Also it normally takes two or three weeks to arrive at your door - depending on your location. If you are not in a rush this is a cost effective option. For faster shipping I recommend EMS however the cost is a lot higher.
EMS: EMS Shipping for up to 20 parts
Shipping is direct from my manufacturer in China. While this method is quite expensive, it is a good option for those who are buying multiple items or who want their items quickly.
Singapore Post: EMS Shipping for up to 50 parts
EMS Shipping is quick and is a good option for those looking to buy lots of items.
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Brad has been an active contributor to the electronics community since 2007.In that time he has released many valuable resources to the community in the form of video and web based electronics and programming tutorials, project schematics, source code and answers all sorts of questions via email and on his electronics forum.
Brad's projects have been featured on many popular websites and blogs including hackaday, kotaku, engadget and has won numerous competitions on instructables.com
Apart from electronics, Brad thoroughly enjoys snowboarding, basketball, skateboarding, teaching, playing drums and bass guitar (not at the same time) for his church band, listening to music, playing retro video games and hanging out with his amazing wife and four awesome boys.