Lesson 6 of 6

Arduino C++: blink without delay

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// Blink without delay on the Raspberry Pi Pico (arduino-pico core) const int LED_PIN = 15; unsigned long last = 0; bool on = false; void setup() { pinMode(LED_BUILTIN, OUTPUT); // GP25, or the radio's LED on W boards pinMode(LED_PIN, OUTPUT); Serial.begin(115200); // USB serial: the baud rate is ignored } void loop() { unsigned long now = millis(); if (now - last >= 500) { // time passed, no waiting last = now; on = !on; digitalWrite(LED_BUILTIN, on ? HIGH : LOW); digitalWrite(LED_PIN, on ? HIGH : LOW); Serial.print("uptime ms "); Serial.println(now); } }

Stopped · Your code isn't running yet. Until you press Run, the board runs the program already on it.

Nothing printed yet. Press Run.

The same board in Arduino C++ with the arduino-pico core: millis() timing, LED_BUILTIN and Serial over the chip's own USB.

Non-blocking timing
LED_BUILTIN on every variant
USB serial

Pin	Connects to	What it does
`GP15`	330 Ω resistor, then the LED's anode	Digital output
`GND`	LED cathode	Return

Wire it in

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

LEDSupply 3.3 V
A 5 mm LED from GP15 through a 330 Ω resistor to GND: (3.3 - 2.0) / 330 ≈ 4 mA for a red LED, within the pin's default 4 mA drive.
Part pin Board pin
A GP15Wire colour orange
K GNDWire colour black
Careful
Never leave out the resistor: the pin would try to drive far more than 12 mA.

Part pin	Board pin
A	GP15Wire colour orange
K	GNDWire colour black

All 10 parts on the Raspberry Pi Pico page

Arduino C++: blink without delay

Try it yourself

Serial monitor

Checks

Break it

Parameters

Wire it in

Arduino C++: blink without delay

Try it yourself

Serial monitor

Checks

Break it

Parameters

Wire it in