It's a 9368
-Original Message-
From: "gregebert"
Sent 12/3/2019 11:47:53 AM
To: "neonixie-l"
Subject: [neonixie-l] Re: 7 Segment Common Anode Display
Reduce the resistors to increase the LED segment current. I assume you are
doing 8:1 multiplexing, so each di
Reduce the resistors to increase the LED segment current. I assume you are
doing 8:1 multiplexing, so each digit is only on for 1/8 of the time
therefore you need more current.
Many years ago when I built my first computer, the HEX display that I
wire-wrapped used 10:1 multiplexing and the
registers and Octal buffers from E-Bay, however in the meantime
> could you suggest a link to an article / document that describes the basic
> method of how this system is constructed.
>
>
>
> Regards,
>
>
>
> Christine
>
>
>
> *From:* neoni...@googlegro
As long as you have direct software control of the 3 GPIO pins (shift,
load, serial_data), it's fairly simple to write a routine to send serial
data. Just make sure that you *never* change more than 1 GPIO pin in the
same instruction, otherwise you run the risk of a logic race condition and
construction method, can you suggest suitable schematic / PCB
layout software?
Regards,
Christine
From: neonixie-l@googlegroups.com On Behalf Of
David Forbes
Sent: Tuesday, November 5, 2019 6:40 PM
To: NeoNixie
Subject: Re: [neonixie-l] Re: 7 Segment Common Anode Display
Here
-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On
Behalf Of Christine Thompson
Sent: Monday, November 4, 2019 9:54 PM
To: neonixie-l@googlegroups.com
Subject: RE: [neonixie-l] Re: 7 Segment Common Anode Display
Hi David,
WOW! thanks, I will review it fully and get the parts
Of
David Forbes
Sent: Tuesday, November 5, 2019 6:40 PM
To: NeoNixie
Subject: Re: [neonixie-l] Re: 7 Segment Common Anode Display
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
There is no reason to use a fancy Maxim chip for an LED display. Two
74HC595 SPI shift registers and two 74AC245 octal buffer chips will do the
job. One for the anodes, one for the cathodes.
On Mon, Nov 4, 2019, 3:41 PM gregebert wrote:
> The Maxim part you mentioned is for VFD's, and it looks
The Maxim part you mentioned is for VFD's, and it looks like it can run as
low as 8V. If you use it to drive the anode of your LEDs, you run the risk
of exposing the logic driving the cathodes (segments) to roughly 6 volts
(the LED has about 2V of forward bias).
If the Arduino has 5V-tolerant
