View Full Version : Basic Stamp TTL Outputs to a CMOS Input for 7 segment display

10-02-2008, 05:24 AM

I have a BASIC Stamp II as well as a 4" tall dual 7-segment display that I want to drive with the Stamp.· Its for a Skii Ball Machine!!!· What Fun!!

Anyways, the 4" 7-segment display accepts a CMOS input only of 0-3.3V and the BASIC stamp is TTL at 0-5V.·· Does anybody know how to deal with this or make them communicate with each other?

I also wanted to inquire about using the CLK command and the DATA command with the BASIC stamp.· Does anybody have any experience or sample code they could let me know about?· The 7 segement display I have accept this type of input to set the display and need some help???

If there is anything I am missing, which I am sure this is, please let me know and I would love to discuss this with you

Thank you so much!!http://forums.parallax.com/images/smilies/roll.gif

Chris Savage
10-02-2008, 05:30 AM
I don’t have a part number available right now, but there are chips that interface 3.3V to 5V and work in both directions. I want to say National is who makes such an IC. I hope this helps. Take care.

Chris Savage
Parallax Engineering

Mike Green
10-02-2008, 05:35 AM
You will need to find a datasheet for this display. Clk and Data often imply some kind of shift register that you'd load using a SHIFTOUT statement, but, without the datasheet, you don't know what you're sending to the display or what it does. Your display may be 5V tolerant or may be destroyed by applying a 5V signal. You don't know without a datasheet.