Do I need to buy hardware for this tutorial?

No. Everything runs in the browser: Circuitly simulates the board, the components and the code. Real hardware is optional if you want to rebuild the circuit afterwards.

Which components are used?

Arduino UNO board, 7 segments 4 digits (TM1637). They are already available in the simulator library.

How long does it take?

About 22 minutes, advanced level, in 4 guided steps.

What should I know before starting?

The previous tutorial in the series, “WS2812 strip: rainbow”, is enough preparation. No software install is required.

Is the code provided and checked?

The simulator checks your wiring and your code automatically at every step, and shows the commented solution if you get stuck.

All tutorials

3 · Outputs & actuators

7-segment display

Advanced22 min

Goal

Count from 0 to 9 on a segment display.

Why it matters

A digit → segments lookup table is the first digital “font”.

What you need

Arduino UNO board
7 segments 4 digits (TM1637)

Nothing to buy: every component below is simulated in the browser.

Steps

01Add the 7-segment display.
02Create const byte digits[10] with each digit pattern.
03Write show(n) applying the 7 bits.
04Count from 0 to 9 with a one-second pause.

This tutorial runs inside the Circuitly simulator: your wiring and your code are checked automatically at every step.

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Frequently asked questions

Do I need to buy hardware for this tutorial?: No. Everything runs in the browser: Circuitly simulates the board, the components and the code. Real hardware is optional if you want to rebuild the circuit afterwards.
Which components are used?: Arduino UNO board, 7 segments 4 digits (TM1637). They are already available in the simulator library.
How long does it take?: About 22 minutes, advanced level, in 4 guided steps.
What should I know before starting?: The previous tutorial in the series, “WS2812 strip: rainbow”, is enough preparation. No software install is required.
Is the code provided and checked?: The simulator checks your wiring and your code automatically at every step, and shows the commented solution if you get stuck.

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