Pro Mini blink
The 5 V Pro Mini running the Nano’s blink on an LED on pin 13: the same chip and the same image, on the smallest Arduino there is. The whole build, an Arduino Pro Mini 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.
Runs in your browser. Free, and no account needed.
The code
The firmware exactly as the editor opens it. Change a line there and press Run: it compiles in the browser.
// Blink: the smallest thing a board can do.
//
// Pin 13 has the LED soldered beside the USB socket on a Nano exactly as it is
// on an Uno, so LED_BUILTIN is 13 here too. The Nano pushes into a breadboard,
// so an LED and a 220 ohm resistor from pin 13 to the ground rail take no
// jumper wires at all.
//
// delay() puts the chip to sleep between timer ticks rather than spinning, so
// this sketch costs the simulator almost nothing while it waits.
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
digitalWrite(LED_BUILTIN, HIGH);
delay(500);
digitalWrite(LED_BUILTIN, LOW);
delay(500);
}
Parts list
4 parts, plus the jumper wires. Every one is in the editor's parts bin.
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: Arduino Pro Mini, 5 V 16 MHz pin GND; LED, green pin C
- Arduino Pro Mini, 5 V 16 MHz pin 13; Resistor, 220 Ω pin 1
- Resistor, 220 Ω pin 2; LED, green pin A
Change it and keep it
Open it in the editor, change the circuit or the code, and keep your version in a free account.