Buy it from the WickedDevice.com store.
The DayCounter can be used for many tasks. Here is it being used as a physical form of the XKCD cartoon reset. Just two of many, many other uses are as a “days until I go on vacation” or “days until the baby is due” counter.
It is designed to be an ideal first soldering project.
Check out these great features:
- Counts up
- Counts down
- Raises an output to 5v when it gets to 0 (countdown only)
- Can chain lots of them together
- 7-Segment display is mounted on the back, creating a flat surface which is easy to mount into projects.
That’s it! All in a super easy kit, designed to be easily moddable, and work with Arduinos.
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What’s in the box?
In short, all the parts you need.
| 1x | DayCounter Printed Circuit Board |
| 16x | 470 Ohm resistors. |
| 2x | 22pF capacitors. |
| 1x | Crystal |
| 1x | 1 K Ohm pullup resistor |
| 1x | 2 digit green 7-segment display |
| 1x | ATtiny Microcontroller, 8 pin |
| 2x | 8 Bit shift registers (74HC595) |
| 1x | 4 pin header |
| 1x | 6 pin in system programming header |
| 8″ | Stranded wire |
| 1x | Push button switch |
Note that this kit does not include a power supply. We recommend you plug in into the wall with a wickedUSB Micro USB power connector and regular wall wart. You can of course purchase one from WickedDevice, but it’s better for the environment to reuse: it uses a standard microUSB for power and lots of phone chargers will work just fine, eg: newer Blackberries.
It can also be powered direct from an Arduino, or using any 5v supply, including batteries.