be80be Well-Known Member Oct 19, 2010 #1 Here a simple way to use a sharp or HD44780 5 volt LCD with a 3.3 volt chip Just hook the to the pot wiper to use the negative volts to get better contrast. Attachments LCD&Power_buddy.JPG 29.3 KB · Views: 611
Here a simple way to use a sharp or HD44780 5 volt LCD with a 3.3 volt chip Just hook the to the pot wiper to use the negative volts to get better contrast.
MikeMl Well-Known Member Most Helpful Member Oct 19, 2010 #2 How do solve the problem that a 5V LCD wants logic 5V swings; not 3.3V?
be80be Well-Known Member Oct 20, 2010 #3 Where you get that idea I've tried a bunch and haven't found one that need 5 for logic to work they need to be -5 from vdd on the contrast pin or V0 pin so you can see them work Last edited by a moderator: Sep 10, 2013
Where you get that idea I've tried a bunch and haven't found one that need 5 for logic to work they need to be -5 from vdd on the contrast pin or V0 pin so you can see them work
DirtyLude Well-Known Member Oct 20, 2010 #4 Goog post. Yes, I've implemented tiny 5v regs in order to just do the display in the past. I've never found one where the logic needed to be 5v.
Goog post. Yes, I've implemented tiny 5v regs in order to just do the display in the past. I've never found one where the logic needed to be 5v.
Kryten New Member Oct 21, 2010 #5 Here is a page with voltage guides.. Logic Voltage Thresholds for TTL, CMOS, LVCMOS, and GTLP IC's And it shows that 5v TTL has a threshold of 2 Volts so 3.3v will be sufficient to set the gate high
Here is a page with voltage guides.. Logic Voltage Thresholds for TTL, CMOS, LVCMOS, and GTLP IC's And it shows that 5v TTL has a threshold of 2 Volts so 3.3v will be sufficient to set the gate high