How to code a robot: from drag and drop blocks to Python and C++

Most kids learn to code a robot in three steps: drag and drop blocks, then Python, then Arduino C++. This guide explains each step, a first program to try, and which robots and kits teach which language, with prices checked in October 2026.

Researched by Riley Hart · updated Oct 18, 2026 · How we research

What coding a robot really means

A robot program is a list of instructions plus rules. Instructions say what to do: drive forward, turn, beep. Rules say when: if the sensor sees a wall, stop.

Every robot language, from blocks to C++, uses the same three ideas. Sequences run in order. Loops repeat. Conditions (if and else) make choices. Learn them once and they carry over.

Step 1: block coding (ages 6 to 11)

Block coding lets kids drag commands into place, so there are no typos. Scratch, from the MIT Media Lab, is free and designed for ages 8 to 16. Many robot apps copy its style.

Wonder Workshop's Dash is a ready to use robot for grades 1+, $189.99 at Stemfinity. It is coded with two free apps, Blockly and Wonder, on iOS, Android and Chrome browsers, per Stemfinity.

No robot yet? VEXcode VR runs virtual robots in a browser. Its free tier includes block coding and 15 playgrounds, and VEX lists it for grades 3+.

Step 2: blocks on real hardware, then Python

The best second robot lets a child switch from blocks to text without buying anything new.

Makeblock's mBot2 is listed in its Age 6+ category at $149.99 (on sale for $94.99 when we checked). Makeblock says kids start with Scratch like blocks in mBlock and move to Python in the same app. Its CyberPi board also supports the Arduino IDE.

The BBC micro:bit is $17.95 at Adafruit. MakeCode codes it with Blocks or JavaScript, and the Micro:bit Educational Foundation runs a separate Python editor in the browser.

Petoi's Bittle X robot dog uses Petoi Coding Blocks, a Python API and C++ in the Arduino IDE, per Petoi. The ACEBOTT QD022 robot arm ($69.98, ages 12+) uses block based ACECode plus Arduino and Python, per ACEBOTT.

Step 3: Python on a Raspberry Pi

Python reads almost like English, which makes it the most common first text language. On a Raspberry Pi robot, the free gpiozero library turns motor control into short commands like robot.forward() and robot.stop(), per the gpiozero recipes.

Python is also how most AI robot projects are written, so it is worth learning before adding a camera or a talking AI model.

Step 4: C++ with Arduino

Arduino programs, called sketches, are written in C++. Every sketch has two parts, per Arduino's docs. setup() runs once when the board starts. loop() repeats over and over so the robot can respond to sensors.

C++ is stricter than Python, and a missing semicolon stops the upload. It also runs fast on cheap boards, which is why most robot car kits use it. The SparkFun Inventor's Kit v4.1.2 ($99.95, ages 10+) teaches Arduino coding through its projects and ends with a robot, per SparkFun.

Your first robot program, in any language

This same program works on almost any wheeled robot with a distance sensor. Build it in blocks first, then rewrite it in text.

• Make the robot drive forward for two seconds, then stop.
• Add a loop so it drives a square: forward, turn right, four times.
• Read the distance sensor and show the number on screen.
• Add a condition: if the distance is under 20 cm, stop.
• Change stop to back up and turn, so the robot keeps exploring.
• Change one number at a time, such as speed or turn time, and watch what happens.

Which language should your child start with?

• Ages 6 to 8: blocks on a ready robot like Dash, or the free VEXcode VR.
• Ages 8 to 11: Scratch at home, plus a robot like mBot2 or a micro:bit.
• Ages 11 to 13: Python on the same robot, or block coding on a build kit like the ACEBOTT arm.
• Ages 12+: Arduino C++ with a kit like the SparkFun Inventor's Kit, or Python on a Raspberry Pi.
• Adults: skip blocks and start with Python or Arduino.

Questions people ask

Related

• How to build a robot at home: three honest paths for beginners
• How to build a robot arm: a kit, a DIY servo arm, or an AI arm
• How to build an AI robot: a talking robot, a robot that sees, or a ready AI kit
• 10 Arduino robot projects for beginners, from easiest to hardest
• Best robot kits for kids and adults
• Best Robot Kits for 10 Year Olds

Kits that fit this guide

Sources

1. Scratch: About Scratch
2. Stemfinity: Wonder Workshop Dash
3. VEX Robotics: VEXcode VR
4. Makeblock: mBot2 coding robot
5. Adafruit: BBC micro:bit v2
6. Microsoft MakeCode for micro:bit
7. micro:bit Python Editor
8. Petoi: Bittle X
9. ACEBOTT: QD022 robot arm kit
10. gpiozero recipes
11. Arduino docs: setup()
12. Arduino docs: loop()
13. Arduino: Software and Cloud Editor
14. SparkFun: Inventor's Kit v4.1.2
15. Adafruit: Raspberry Pi 5, 2GB