self.raymond asked 2 weeks ago
I am working on a project that has an esp32s3 and an st7796s display. I need a 5 volt power supply. I want to use a 5 volt phone charge. Can I use the other usb connection on my esp32s3 for connecting my phone charger What other precaution do I need to take when hooking up the st7796s
Sara Santos Staff answered 2 weeks ago
The display supports both 3.3V or 5V.
You can read this introduction about the display:https://randomnerdtutorials.com/esp32-tft-touchscreen-display-2-8-ili9341-arduino/
Scroll down to this section ” Wiring the TFT LCD Touchscreen Display to the ESP32 Board”, after the table, we explain how to figure out if your display is set to use 5V or 3.3V.
Regards,
Sara
Sara Santos Staff answered 2 weeks ago
Hi.
So, do you want to power the ESP32 via your Phone charger?
If the phone charger outputs 5V, it is fine.
If your board has two USB connectors, make sure you don’t use both at the same time.
I hope this answers your question.
Regards,
Sara
paulfjujo answered 2 weeks ago
Hello,
The main problem with an external USB Charger 5V, (or Power bank ) is the capabitlity to deliver a very high current
in case of short cut on your application : risk of burning
wich is not the case from an PC USB wich is ofen limited to 100 or 500mA..
So possible, but need to pay more attention.
For a Powerbank ,the problem is the mimimum of consumption (>100mA or Powerpank disconnect itself.
after a timeout….
for my tests i use a 230V/9V DC bloc 500mA max , followed by a buck voltage controler to get 5V …
I your LCD ST7796S powered by 5V ? support 3,3V level fro commands?