Lessons

One condition. One action.

Every lesson is a single rule, so students see cause and effect straight away. Pick a lesson, press the controls and watch the program and the hardware react.

The demos on the product page use simulated signals to show the idea. Real recordings are noisier, and focus and relax are uncalibrated indicators.

Lesson list

Lesson	Signal → Action	Headset	Concepts
Eyes closed, light on	alpha → LED D10	✅	Alpha rhythm, if / else, threshold
Focus meter	focus → servo	✅	Mapping a range, beta band, servo
Quiet room	alpha + no motion → screen	✅	Combining two signals, PIR motion, 16×2 LCD
Follow the knob	knob → servo	❌	Analog input, mapping a range
Plant care	soil → buzzer	❌	Raw ADC counts, threshold, buzzer
Blink is not a thought	artifacts → screen	✅	Artifacts, signal quality, OR logic

Eyes closed, light on

Close your eyes and the alpha rhythm (8 to 13 Hz) over the back of the head grows. One rule turns that into a light.

forever
  if  alpha > 35%
      light D10 on
  else
      light D10 off

Focus meter

The focus index is mapped onto the servo angle, so the arm becomes a needle. It is an uncalibrated indicator, so it means "higher than a moment ago", not a score.

forever
  servo to  map(focus, 0–1 → 0–180°)

Quiet room

Two readings, one action. If alpha is high and the motion sensor sees nobody, the screen asks for quiet.

forever
  if  alpha high  and  no motion
      screen "shh"
  else
      screen "hello!"

Follow the knob

A warm-up with no headset. Turn the knob and the servo follows. The knob is a raw count from 0 to 1023, mapped onto 0 to 180 degrees.

forever
  servo to  map(knob, 0–1023 → 0–180°)

Plant care

The soil sensor reads a raw count. When it falls below the line, the soil is dry and the buzzer sounds.

forever
  if  soil < 300
      buzzer on
  else
      buzzer off

Blink is not a thought

Blinks and jaw clenches are muscle, and they show up in the EEG as big swings in RMS and gamma. This rule flags them on the screen.

forever
  if  RMS > 45 µV  or  gamma > 22%
      screen "artifact!"
  else
      screen "EEG ok"

Ready mixes (Repeat page)

The Repeat page has six ready machines to run and remix, including eyes closed → light on, walk-by → buzzer, knob → servo, focus → servo, distance → light, and alpha + no motion → a line on the screen. Running one does not save over your own stack.

Five block levels

Same kit, same lessons. Move up a level as the class does.

Level	Name	Focus	Audience
1	Story		Primary school
2	Words
3	Bands	δ θ α β γ
4	Measure	Numbers and units
5	Raw	Raw values	University

Teaching notes

Start every class with Follow the knob: it works without a headset and teaches mapping.
Use Blink is not a thought early, so students learn that a big signal is not always brain activity.
Never present focus or relax as a score of a student's ability or mood.

Firmware Flashing Sensors & Outputs