Downloads

Here a few downloads for this the project:

• The Plans as a PDF file. Scematics, layout diagram and part list. For all of you who do not want to install KiCad just to see them :-)
• My KiCad pro­ject directory containing all the library symbols following as well as the firm­ware.
• The Digi­tast Foot­print for Ki­Cad.
• Spark­fun SEN-13897 foot­print for KiCad.
• Digitast 3d model for KiCad: it is not according to the actual KiCad design rules since it is not scaled 1:1. In spite of this it allows a visual accurate representation.
• NEB21R 3d-Modell for KiCad: this is also not 1:1 but it works well in the 3d viewer. It fits (nearly) to the footprint Barrel Jack. According to the datasheet the back pin is 3,5 mm wide and woun't fit into the drilling. The part I got from Reichelt doesn't have this big back... Either it is not manufactured by Lumberg or they must have changed something.
• IPAK 3d Modell for KiCad: again not 1:1 but it looks good.
• My Footprint of the seven segment display SC52-11.
• My Step- and WRL-Modell of the SC52-11.
• The Lcd-Font for 7 segment Displays (works for LEDs as well as LCD of course. The color makes the style!) as TTF and as Webfont. Free for any use except for sale!
  Pimp up your printed or online documentation or insert it into your software, whatever you want, it is free!
  Note: This is no writing font! It only contains characters that are displayable with a 7 segment display, as such a capital A but no small one, a small b but no capital one, a closed rectangular bracket but not an open one (which would look like a capital C). Of course it has no x, w or v since these characters can not be displayed on a seven segment display.
  There also redundant characters like the capital O which would be the same as the digit 0 are not part of this font although it might be clear considering the context which it is. The user should be urged to the practical use of this font.
  Have a look here to see the implemented characters.

A note for the Digitast: The symbol does not represent the exact physical dimensions. The Digitast has been designed for a 2,54 mm grid and so I limited the symbol accordingly since it is much more easy to be drawn. Indeed, the switch is one or two tenth of a millimeter smaller than the symbol. This is less than the line width of your silk screen and should be no problem in real life. Pads and drills are 100% following the datasheet, of course.

Links

Here a few Links I found to be useful.

• The SparkFun Load Cell Amplifier as available at Mouser.
• The Load Cell as I used it, here at the Mouser store.
• The datasheet of the seven segment display from Kingbright.
• Datasheets of the ATmega8A and of the ATmega88PA from Microchip.
  Microchip frequently changes these addresses, more frequently than I check them. If the links do not work, just google for it...