Seven-segment display object

SSteve

Here's a general-purpose seven-segment display object. It will control from one to eight digits.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
OS-X: because making Unix user-friendly was easier than debugging Windows

links:
My band's website
Our album on the iTunes Music Store

Bugman53

How do i display a decimal point?

Thank you for your time.

abecedarian

Bugman53 wrote: »

How do i display a decimal point?

Thank you for your time.

Convert the number to a string / char array, then find the "." and light the appropriate dot?

ChrisGadd

Just uploaded this seven-segment driver to the obex.

This driver works with any number of digits, digits must be on contiguous pins, with the low digit on the low digit-select pin.
The segments are also required to be on contiguous pins, but the order can be re-arranged by editing a lookup table.
Reads characters from a text string to write to the display, numbers "0" through "9", minus "-", decimal point ".", and space " " are recognized.
Includes methods for creating a string from integer values, or from an integer with a divider to a specified number of decimal places.

Works with common-anode and common-cathode displays, and also with transistor-driven displays.

Mark_T

I usually use Charlieplexing to drive small 7-segment displays, 9 pins total
for 8 digits (or 8 pins for 7 digits without DP).

ChrisGadd

Shoot, I hadn't even thought about a charlieplexing driver. I'd looked into it a while back for a project with 14 digits, but couldn't spare even that many pins and ended up going with a 7447 BCD-to-seven segment converter and a 74154 four-to-sixteen line decoder. I'd also considered serial shift registers, but didn't have any on hand to test with.


Okay, just added a Charlieplexer to the obex. Nine pins gets you nine 7-segment displays with decimal points, additional displays require additional pins. This driver supports as many displays as you have pins for. Tested it with 10 displays with no noticeable flicker.