Re: Introduction / Newbie Questions


AndyH
 

The touch controller seems to be fine with 5V according to the datasheet, and that's the only controller on the display board.  I'm guessing you called it right.

https://datasheetspdf.com/pdf-file/746665/XPTEK/XPT2046/1


On Sun, Nov 8, 2020 at 11:45 PM, William Kimber <will-k@...> wrote:

Hi,

Do you mean " jumper for 5v"?

 Photo looks to me to be, jumper j1 to bypass regulator and run from 3.3v. I don't have display to check.  Also seems logical that it is set up for 5v and requires adjustment for 3.3v. Much safer.

Cheers,

Will,

ZL1TAO

 
On 9/11/20 3:56 pm, AndyH wrote:
Hey Mark,

   The HiLetGo display has a 3.3V 3-pin voltage regulator on the board (U1), but by default it is not in circuit.  There's a small pair of pads (looks like a regular SMD pad) labeled J1.  If you jump the pads with a solder blob, you can run the display from 5V.

    Enjoy,
     Andy



On Sun, Nov 8, 2020 at 02:47 PM, Mark Erbaugh wrote:

<snip>

 

Display

I located a display on Amazon (https://www.amazon.com/HiLetgo-240X320-Resolution-Display-ILI9341/dp/B073R7BH1B/ref=pd_di_sccai_1/137-6123160-7195153?_encoding=UTF8&pd_rd_i=B073R7BH1B&pd_rd_r=c9b8f25e-8904-4eec-8556-c7f85bef70a3&pd_rd_w=scFer&pd_rd_wg=w9kKW&pf_rd_p=5415687b-2c9d-46da-88a4-bbcfe8e07f3c&pf_rd_r=TNTWYDB8SEGQJBMW9BKR&psc=1&refRID=TNTWYDB8SEGQJBMW9BKR)

 

that appears to be very similar. However, the docs say that it only runs on 3.3V, not 5V and that level shifters are required. I don’t see those on the schematic. Is this display being run at 5v?

 

<snip>

 

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