Lesson 1 of 5

Blink LD2 and an LED

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// Blink LD2, and an LED on D13, at 3.3 V // Resistor in series with the breadboard LED: 220 Ω const int LED_PIN = LED_BUILTIN; // D13 = PA5, the green LD2 on the board void setup() { pinMode(LED_PIN, OUTPUT); } void loop() { digitalWrite(LED_PIN, HIGH); // 3.3 V delay(500); digitalWrite(LED_PIN, LOW); // 0 V delay(500); }

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The Nucleo's Hello World. D13 is pin PA5, which drives the green LD2 on the board; wire an LED and a resistor to the same pin and both blink together, at 3.3 V instead of an Uno's 5 V.

LD2 on the board blinks too: it's the same pin
Pick the resistor and watch the brightness change
The ST-LINK uploads over SWD: no bootloader, no reset button

Pin	Connects to	What it does
`D13`	220 Ω resistor, then the LED's long leg	Output: 3.3 V when HIGH, 0 V when LOW. LD2 blinks with it.
`GND`	The LED's short leg	The current's way back.

Wire it in

Sensors and actuators this board drives, with the real connections.

All 8 parts on the STM32 Nucleo-F401RE page

Blink LD2 and an LED

Try it yourself

Serial monitor

Checks

Break it

Parameters

Wire it in

Blink LD2 and an LED

Try it yourself

Serial monitor

Checks

Break it

Parameters

Wire it in