SPIN and Scott Edwards displays...4x20

denno

I have done some searching for an OBJECT to run the above displays. I am having a little trouble, since it is a serial data in, and inverted. I know this has been discussed, but there appears to be no OBJECT code written for it. Any help would be helpful...thank you DennO

Chris Savage

While there's nothing written specifically for this display, you need only use the FullDuplexSerial object and select inverted mode. As for what to send, the documentation lists the commands and sending text would be the same no matter what the device.

John Abshier

If I remember correctly, the Scott Edwards display does not work with my Propeller. It has a voltage divider on the input and didn't see the Propeller's output as a high. Apparently, some work with the propeller. See this link "http://forums.parallax.com/discussion/123511/propeller-scott-edwards-serial-backpack"]"]

John Abshier

Chris Savage

You could always use a line-driver or even better yet, use a transistor and use normal baud mode. The transistor will convert the 3.3V to 5V on the display and invert the signal for you.

denno

Thank you Chris...there was a thread that someone above linked me to, and it showed what you are mentioning, with a transistor. I believe that a hex inverter would do the same thing, to give me a 5 volt signal to drive the display. Scott Edwards, has some very nice displays, especially, the 4x40, backlit.

DennO

Chris Savage

Yes, a hex inverter would work if you have one. I am one of the few people I know who still have 74xx series logic chips in his parts bins. :nerd:

JonnyMac

One of my favorite level shifters is the TC4427; it's available in 8-pin DIP, has two channels, and uses totem-pole FET output that is very stiff. The TC4427 is non-inverting, but there are inverting versions.