Arduino Serial Monitor shows nothing? Six causes and quick fixes
The serial monitor is empty and you do not know why. Six causes, from a missing Serial.begin to the wrong board, with a test sketch you can run.
The Mokxi blog
News from the workbench: what we shipped, how it works and guides for building with it. Follow by RSS or see every update.
XOR gate explained: build a half adder with a 74HC86 and a 74HC08
Learn how an XOR gate works, then wire a 74HC86 and a 74HC08 in your browser to make a half adder that adds two bits and shows the carry.
Make an advent calendar with an Arduino, an OLED and one button
Build a 24-door advent calendar on a 0.96 inch OLED. One button opens the next door, with a progress bar. Full Arduino code you can run in Mokxi.
Arduino LED not lighting up? Seven checks that find the problem
An LED that stays dark is usually a wiring or one-line code mistake. Work through seven checks in order, each tested in the Mokxi simulator.
NOR gate and the 74HC02: a beginner's guide, with one wiring trap to avoid
Learn how a NOR gate works, wire a 74HC02 in your browser (its pinout is not the 74HC00's), and build NOT, OR, AND and a latch from NORs.
Arduino error: 'was not declared in this scope' (4 causes and fixes)
Four common reasons an Arduino sketch says "was not declared in this scope", what Mokxi's build card says for each one, and how to fix it fast.
NAND gate tutorial for beginners: build every other gate from a 74HC00
Learn the NAND gate truth table, wire a 74HC00 in your browser, then build NOT, AND, OR and XOR gates out of NANDs alone.
Work Through Starter Kit Projects in Your Browser
Follow Arduino starter kit projects in Mokxi without any parts: how the kit companion pages and lessons work, with a starship control panel to build.
A Four-Week Arduino Unit Plan for Teachers
A four-week Arduino unit for teachers using Mokxi: LED, button and Serial, a distance sensor, and a small project, with goals, hand-ins and common mistakes.
Read a DHT22 on an ESP32-C3 and Print to Serial
Wire a DHT22 to an ESP32-C3 in Mokxi, pick a safe GPIO, power it from 3.3 V and print temperature and humidity to the serial monitor at 115200 baud.