开云体育

Most TFT color displays will run more current. Out 5" display runs as high as 0.7A.

Jack, W8TEE

On Monday, June 18, 2018, 2:51:26 PM EDT, Joe <joeman2116@...> wrote:

I have a 3.28 Enhanced version on my ubitx.

When I first installed it I noticed it ran warmer than with 4 line lcd display.

I have a heatsink on the raduino regulator so it was warm but not excessive.

However, with no display it was very cool.

Most of us agree it would be best to use 5v from another source like one of the small adjustable 5v 1amp units on ebay

Especially if your using the large display.

With the 5v regulator ebay module as source, the raduino regulator barely has any detectable heat.

Joe

VE1BWV

On Mon, Jun 18, 2018, 12:47 PM Michael Babineau <mbabineau.ve3wmb@...> wrote:

As it appears that the Nextion Display will be getting its +5V from the L7805CV regulator on the Raduino board, I started wondering
if this regulator is up to the task (it is rated at 1.5 A) and if so whether or not this might mean that adding a heatsink to the regulator
might now be a must (mine already runs pretty hot).?

First I took a peek at the datasheet for the existing 1602 Display. The VISHAY datasheet that I had previously downloaded shows that?
the Supply current (IDD) is only 3mA but it also lists LED forward current (IF) Array: 260mA Edge: 40mA (these are the Max values).
So I am assuming that this means that the worst case current draw for the existing uBITX display is 3mA + 260 mA + 40mA which would be 303 mA ??

If this assumption is correct then the average current would be around 152 mA for the existing 16x2 Display based on average numbers (1.2mA + 130mA + 20 mA).?

Looking at the specs for the Nextion 2.8 inch display () it claims that for a VCC of 5V and a Brightness of 100%? the?
typical current draw is 65mA !? This seems too good to be true.?

Unless I am missing something, this would mean using the Nextion would provide about 82mA current savings over the existing LCD display.??

Michael VE3WMB?