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Built-in project · Wemos LOLIN32 Lite

LOLIN32 Lite button

A pushbutton on GPIO 4 lights the LOLIN32 Lite’s blue LED on GPIO 22, which comes on when its pin is LOW. The whole build, a Wemos LOLIN32 Lite and 1 more part, runs here in your browser on the firmware below; open it in the editor to change the wiring or the code and run it again.

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The parts retail for about $10.10. On Mokxi they're free.

LOLIN32 Lite button · Wemos LOLIN32 Litelive0.000 s 0.00x
Hold the button
The circuit itself, running here on the simulator. Press what can be pressed; click anything else to open it in the editor.

The code

The firmware exactly as the editor opens it. Change a line there and press Run: it compiles in the browser.

sketch.ino · Wemos LOLIN32 Lite
// Button: a pushbutton on 4 lights the blue LED on 22.
//
// INPUT_PULLUP switches on the pad's 45 k pull-up, so GPIO 4 sits at 3.3 V
// until the button pulls it to GND and reads LOW while it is held. The LED on
// GPIO 22 lights when that pin is LOW, so the pin simply copies the button.

const int BUTTON = 4;

void setup() {
  pinMode(BUTTON, INPUT_PULLUP);
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, digitalRead(BUTTON));
  delay(5);
}

Parts list

3 parts, plus the jumper wires. They retail for about $10.10; on Mokxi they're free.

How it is wired

2 connections, pin by pin, read from the circuit itself. Each line is one set of pins joined together, by a jumper wire or a breadboard strip.

  • Ground: Wemos LOLIN32 Lite pin GND; Pushbutton pin 2a; Pushbutton pin 2b
  • Wemos LOLIN32 Lite pin 4; Pushbutton pin 1a; Pushbutton pin 1b

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