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.
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.
Wokwi-GUEST WiFi Sketches on an ESP32 in Mokxi
Moving an ESP32 WiFi project over? Sketches that join Wokwi-GUEST connect as they are in Mokxi. See the wiring, the sketch and what the simulated WiFi does.
Flickering Jack-o-Lantern Light on an ESP32-C3
Make one NeoPixel flicker like a candle inside a jack-o-lantern with an ESP32-C3 sketch, random brightness and smoothing, running in your browser.
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.
Trigger a Fog Machine with a PIR Sensor and Relay
Build a Halloween motion trigger on an Arduino Uno: a PIR sensor fires a relay for a short burst, then ready and cooldown LEDs show when it can fire again.
Hand Out a Circuit and Collect Student Work Online
A teacher guide to Mokxi classes: hand out a locked starter circuit, collect submissions, see what changed and auto-check an LED and button project.
Build a Grabbing Candy Bowl with an Ultrasonic Sensor
Build a Halloween candy bowl in Mokxi that grabs back: an HC-SR04 spots a hand, a servo swings down, a piezo shrieks, and a cooldown resets it.
analogWrite Will Not Fade? The Pin May Have No PWM
Your Arduino Uno LED jumps on instead of fading? See why analogWrite needs a PWM pin, which Uno pins have it, and how Mokxi's Circuit Doctor flags it.