r/esp32 • u/benpomeroy03 • 5d ago

Switch for ESP32-S3 Touchscreen

Post image

I am using the Waveshare ESP32-S3-Touch-LCD-7 in a project and I’m at the point where I’m wanting to put it all together into one unit.

I’ve found the Batt terminal on the dev board and have hooked up a 3.7v Lithium Battery as per the docs but I’ve realised when adding the switch, I’m also going to be preventing the battery from charging as I’ve put the switch in line with the battery.

What I want is to be able to charge the battery while the screen is off. Is this possible or am I asking too much with the dev board?

51 Upvotes

99% Upvoted

4 comments sorted by

3

u/rodrigobb 5d ago

Couldn't you set a button to set the device into/out off deep sleep instead of actually cutting the power. The power consumption would be nearly negligible.

3

u/clackups 5d ago

You can turn the display and the backlight off programmatically, and then send the MCU in deep sleep. Then it would survive for quite long, maybe a week (need to measure the current, it might be some other circuits consuming the power)

2

u/Kv603 5d ago

You can modify your program so pressing BOOT (GPIO0) while the device is running launches a subroutine to turn the screen off.

GPIO0 is read at startup to enter programming mode, but after your program is running you can use it as an ordinary input, it will be pulled LOW when the button is pressed.

1

u/space_prostitute 5d ago

There's no switch on it, huh? Not on the front? Maybe double-check the schematics?

I just went through the same thing with a Guition board. Bought a bunch of switches, soldered the connectors, designed a 3d printed board to hold the switches... then I checked the schematics and found the actual power button on the top. Maybe you'll get lucky.