Nine live readings update twice per second. Each card shows the value, unit, and a real-time progress bar.
🌡
Temperature
AHT20 · I2C 0x38
Celsius or Fahrenheit — switch units any time. Breathe on the chip and watch it rise.
💧
Humidity
AHT20 · I2C 0x38
Relative humidity as a percentage. Same chip as temperature, always in sync.
☀
Light Level
Analog A3
Ambient brightness 0 to 100%. Cover the sensor with your hand and the bar drops to zero.
🔊
Sound Level
Analog A2
50-sample rolling average. Clap near the board to see an instant spike.
🌬
Air Pressure
SPL07 · I2C 0x77
Atmospheric pressure in hPa or inHg. Shows your local weather changing over time.
🏔
Altitude
SPL07 · I2C 0x77
Real height above sea level from the barometric formula. Metres or feet.
📳
Vibration
LIS3DH · I2C 0x19
Seismic magnitude above calibrated baseline. Tap the desk — it responds instantly.
🎭
Rotary Dial
Analog A0
Turn the potentiometer from 0 to 100%. The card and bar follow in real time.
D4 — Button
WiFi Scanner
Press once to scan nearby networks. Results appear with signal strength bars.
D5 — Buzzer
Audio Alerts
Sweeping tone during scan. Two rising beeps when the scan finishes.
D6 — LED
Heartbeat Light
Flashes with every data packet so you can see the firmware is alive.
I2C 0x3C — OLED
128x64 Display
Boot splash on startup. Animated scan screen during WiFi discovery.