Hi Folks,
Hoping the group can help. I built an eight 8 clock using 2 savaged 4 digit
bedside alarm clocks. I am using a multiplex method to support the display. The
multiplex is based on a design provided by David one of this group's members
and consists of a 74HC595 SPI 16 shift register and
> Here is a schematic diagram that I just whipped up. It uses the SPI signals
> to shift data into the anode and cathode drivers.
> The software needs to write two bytes (digit then segments) to the SPI port,
> then write LOW then HIGH to the LD/ signal.
You can also use an HT16K33 chip which
Hi,
I am sure the group can help with this simple question. I am building a
clock using 8 x 7 Segment Common Anode
displays. The display uses a MAX6921AWI display driver chip and
multiplexing to drive the displays. The
problem is that the above chip has a minimum output of 8V, however the 7
