[sdiy] 7-segment LED displays with 4511 driver chip - max current?

john slee indigoid at oldcorollas.org
Sat Aug 8 00:34:20 CEST 2015

On 7 August 2015 at 17:04, Rick Jansen <rick.jansen at xs4all.nl> wrote:

> I2C may be relatively slow, but this is a user-interface thingy, and we
> humans are very very slow, compared to I2C. Well, I am.
> I'll see how I fare. I really like I/O extension of the Arduino with the
> PCF8574 chips, and the way that one pin change gives you an interrupt. (Shift
> registers don't do that.)

If you're using the PCF8574 you may also want to have a look at Microchip's
MCP23017 (i2c) and MCP23S17 (SPI). Other than the bus interface the i2c and
SPI versions are very similar.

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