Virtual Lab Credits

Virtual Lab Credits — one balance that pays for everything chargeable in the Virtual Lab: replies from the AI assistant, and the timed exams you run for a class.

Ask the assistant. One credit is one reply. It sits beside your code and your circuit, so you can ask why your I²C sensor is silent, what a compiler error actually means, or how to drive a servo from an ESP32 — about the sketch and the wiring in front of you, not in the abstract.

Or open an exam. Running a timed exam draws on the same balance, so a single top-up covers both the teaching and the assessment at the end of it.

• They never expire. Buy ten or a thousand; what you do not use keeps.
• Priced per credit. No subscription and no monthly minimum — choose the quantity at checkout.

The Virtual Lab itself is free to use: simulate Arduino, ESP32, Raspberry Pi, Pico and STM32 boards in the browser, wire the circuit, and watch the serial monitor and the scope as it runs. Open the Virtual Lab and try it before you buy anything.