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.
Posts tagged “arduino”
News from the workbench: what we shipped, how it works and guides for building with it. Follow by RSS or see every update.
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.
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.
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.
Why delay() Makes Your Button Miss Presses (and the Fix)
Your Arduino button works sometimes and ignores you at others. Learn why delay() in loop() misses presses, and fix it with millis() on an Uno.
Make a Porch Light That Turns On at Dusk
Build a dusk light in Mokxi with a photoresistor sensor and an Arduino Uno, and use hysteresis so the lamp does not flicker as the light fades.
Build a Talking Skull with a Servo Jaw and Glowing Eyes
Build a Halloween talking skull on an Arduino Uno in Mokxi: a servo jaw timed to a DFPlayer track, green LED eyes and a motion sensor to wake it.
Test an Arduino Sketch on Every Push with Free CI
Run your Arduino Uno sketch in the Mokxi simulator on every push with the free CLI. Serial checks, a button test and a JUnit report, no account needed.