The Counting Box
The initial concept was simple: a seven segment LED display so it could be read in the dark, a rotary switch in the middle to choose the value to operate with, and big buttons for adding and subtracting. Green makes the number get larger and red makes the number get smaller.
The electronics were first, since the size of the case would depend on the size of the finished electronics. I ordered these 4-digit seven-segment displays and this 10-position rotary switch from Mouser, and these video game buttons from Sparkfun. It would all be driven by a standalone ATMega 328 on a perfboard. The picture below shows the finished circuit right before I mounted it into the box.
The display is driven by a MAX7219 chip, which can drive 64 LEDs or 8 seven-segment digits with only 3 output pins on the ATMega. Interfacing with this was easy, with the only difficulty coming from keeping track of which wire was which when linking to the LEDs. Counting up to 99,999,999 might take a while, but it’s good to have goals, right?
[Source] HahaBird- The Counting Box
A Custom 3D Printed Case for CHIPINO
Here’s an example of how to use your 3D printer to design a custom enclosure. Read More...
CubeSats — Part 2: The Basic Subassemblies.
Learn about some of the kits and basic subsystems that are now available for starting your own space program using CubeSats. Read More...
Numbats and Morays and Wi-Fi, Oh My!
Numbats and Morays and Wi-Fi, Oh My! Biologically, eels and anteaters are on the opposite ends of the animal world scale. Convert them to silicon and the combination of snouts, hair, teeth, and scales makes for a pretty good W-Fi sensor node development platform. This month's column takes the brand new Moray Wi-Fi development board and its Numbat networking module for a monitor and control spin on the Internet. Read More...
Load and Go!
Discover a way to selectively run multiple applications that wouldn’t normally fit into 32K of memory. Read More...
Reader Questions Answered Here (02.2015)
Questions about the size of satellite dishes and why there’s a lump in your power cable are answered. Read More...
January 08 - An Intro and Antennas
December 18 - Just in Time Parts vs. the Junkbox
October 28 - Save Time and Money Making CNC Halloween Decorations
October 22 - The Internet of Things
November 26 - Anwser for D Cell or Gell Cell Adapter for Nikon Cameras Use Nikon’s EP5 power supply connector. No camera modification or battery door removal is required. Now the remaining trick is…
August 23 - Anwser for Laser Power Supply Too bad I didn’t read your entry just a little more closely… I have not seen such a powerful diode…
January 28 - Anwser for Traffic Detector Robert beat me to the punch regarding the Doppler. My thought was to install both a Doppler sensor (like a…
November 07 - Tesla Coil Theory Thank’s for answering my question Bart, I was alway’s fascinated with Nikola Tesla inventions and what he did in Colorado…
August 02 - Diode Selection On Multimeter Thanks a lot! GFP.