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Built-in project · STM32 Nucleo-F411RE

Nucleo fade

analogWrite breathes an LED on D9 of an STM32 Nucleo-F411RE, at STM32duino’s 1 kHz PWM. The whole build, an STM32 Nucleo-F411RE and 2 more parts, 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 $16.15. On Mokxi they're free.

Nucleo fade · STM32 Nucleo-F411RElive0.000 s 0.00x
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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 · STM32 Nucleo-F411RE
// Fade: breathe an LED with PWM.
//
// Wire an LED and a 220 ohm resistor from D9 to GND. D9 is the STM32's PC7,
// which analogWrite drives from TIM3's second channel at 1 kHz, as STM32duino
// does. The PWM pins on the Nucleo's Arduino header are D3, D5, D6, D9, D10
// and D11, the same as an Uno's.

const int LED = 9;

void setup() {
  pinMode(LED, OUTPUT);
}

void loop() {
  for (int v = 0; v <= 255; v += 5) {
    analogWrite(LED, v);
    delay(20);
  }
  for (int v = 255; v >= 0; v -= 5) {
    analogWrite(LED, v);
    delay(20);
  }
}

Parts list

4 parts, plus the jumper wires. They retail for about $16.15; on Mokxi they're free.

How it is wired

3 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: STM32 Nucleo-F411RE pin GND; LED, red pin C
  • STM32 Nucleo-F411RE pin D9; Resistor, 220 Ω pin 1
  • Resistor, 220 Ω pin 2; LED, red pin A

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