Unable to make T-Display S3 work with LiPo battery

Fabryz

Hello everyone,
I am using my Lilygo T-Display S3 to make an halloween project.
At the moment I'm just using the display to show something, and the device is powered by a powerbank via the USBC port. But I wanted to make the project smaller and portable.

So I bought 4x LiPo Batteries with its own re-charger, I have charged up the batteries and connected each of them to the T-Display S3 with the JST port: it won't powerup, no battery is working with the device. What am I doing wrong?

The LiPo batteries: https://www.amazon.it/dp/B087LTZW61?psc=1&ref=ppx_yo2ov_dt_b_product_details
Specs: 3,7 V 1100 mAh with Micro JST 1.25

The recharger: https://www.amazon.it/dp/B0BN3X7MX9?psc=1&ref=ppx_yo2ov_dt_b_product_details

teastain2

Sounds like the ol' GPIO 15 must be turned on HIGH issue.
This enables the display power and the circuit that uses and re-charges the battery.
I made a support repository for new users here:
https://github.com/teastainGit/LilyGO-T-display-S3-setup-and-examples
My examples are the simplest possible sketches that use the display, TFT_eSPI and Serial.print functions, as a sort of tutorial.
Hope this helps -Terry

If you are not running one of my sketches, you should add:

#define PIN_POWER_ON 15 // LCD and battery Power Enable
#define PIN_LCD_BL 38 // BackLight enable pin (see Dimming.txt)

just before the setup and then in setup add:
pinMode(PIN_POWER_ON, OUTPUT); //triggers the LCD backlight
pinMode(PIN_LCD_BL, OUTPUT); // BackLight enable pin

digitalWrite(PIN_POWER_ON, HIGH);
digitalWrite(PIN_LCD_BL, HIGH);

Fabryz

@teastain2 Thank you! I will try when I get back home

Fabryz

I confirm that this has solved my issue and mark it on the title for the posterity, many thanks!

edit: apparently titles cannot be edited after a while, if a moderator could add "[SOLVED]" to this thread's title, it would be helpful for others

Swerwe123

Thank you so much for solving the problem with this topic. I was looking for it and got solution from it. Thanks

teastain2

@swerwe123 I solved it with @RobLatour 's help. Glad to hear it helped!