What to learn after Arduino Blink

Getting Blink working proves that your board, USB connection and Arduino IDE are talking to each other. The useful next step is not to copy a much bigger sketch. Keep the LED and add one new idea at a time through the 17 practical steps grouped on seven pages.

First: blink and alternate external LEDs

Build an external LED with its own resistor, then add a second LED. Change the delays and create a flash pattern. Lessons 1–2 →

Next: sequence six outputs

Run six LEDs in a chain, then arrange them as two traffic lights. Lessons 3–4 →

Then: find out what a digital pin reads

Use Serial Monitor to test a pin at GND and 5 V, see why an unconnected input floats, compare pull-down and built-in pull-up wiring, then wire and test a tactile button. Lessons 5–8 →

Use and latch the button

Count presses, turn an LED on while a button is held, then toggle the LED on one press and off on the next. Lessons 9–10 →

Move from digital to analogue

Read a potentiometer on A0. Fade an LED using division before trying map(), then display levels 0–7 on six LEDs. Lessons 11–13 → Lesson 14 →

Build bare LDR and thermistor dividers

Read raw light and temperature values, use them to switch an LED, and make a rough two-point calibration. Lessons 15–17 →

When are you ready for a real project?

You are ready when you can wire an LED, read a button, inspect an analogue value in Serial Monitor and make a simple decision using that value. At that point, combine components rather than learning them in isolation. The PAH Automatic Night Light combines an LDR, potentiometer and PWM output. The Temperature Warning System combines a thermistor with three status outputs.

Do you need arrays, loops and libraries yet?

Not necessarily. They are useful tools, but learning them before you understand the hardware can hide what the programme is actually doing. PAH Level 1 deliberately uses direct, readable code first. More abstract techniques come later when they solve a problem you already understand.

A complete route after Blink

If you would rather follow one structured path, open the free PAH Arduino UNO beginner programme. It starts with breadboards and LEDs and progresses through inputs, analogue sensors, PWM and complete design briefs.