Neuro PlayGround (NPG) Lite is an open-source neuroscience development board by Upside Down Labs that lets you read, process, and act on bio-potential signals like EEG, EMG, and EOG. This repository contains several standalone examples for the NPG Lite hardware.
Each folder is a self-contained Arduino sketch targeting a specific application. Sketches range from raw signal streaming over serial to full Brain-Computer Interface (BCI) pipelines that control external devices wirelessly via Bluetooth Low Energy (BLE), infrared (IR), or Wi-Fi.
| Example | Code |
|---|---|
| Default program to show Visual, Auditory, and Haptic feedback on NPG | NPG-Default.ino |
| Calculate FFT & Band Power of single channel EEG and print on Serial | Serial-FFT.ino |
| Bluetooth Low Energy (BLE) server to notify client with real-time NPG data | BLE-Server.ino |
| BLE client to take notification from server and trigger GPIO | BLE-Client.ino |
| BLE server to notify client based on EEG band (beta) power triggers | BLE-BCI-Server-Toggle.ino |
| InfraRed (IR) receiver code to identify LG AC remote button commands | IR-LG-Receive.ino |
| IR signal send example code to control LG AC to toggle ON/OFF using user button | IR-LG-Send.ino |
| Brain Computer Interface (BCI) to toggle LG AC ON/OFF using EEG band (beta) power | BCI-IR-Send.ino |
| BLE client that receives notifications from the server and triggers GPIO to control the car | BLE-BCI-Car.ino |
| BCI remote (server) to drive the BLE car using EEG band (beta) power and EMG (envelope) data | BLE-BCI-Car-Remote.ino |
| Brain Computer Interface example sketch for Double blink and focus detection. | BCI-Blink-Serial.ino |
| Brain Computer Interface to control a menu of options using Double blink and focus detection for ALS patients. | BCI-Blink-BLE.ino |
| MPU6050 sketch to stream 3-axis accelerometer data and send 4 keystrokes to play video games on laptop. | Gyro-Motion-Detection.ino |
| Detects double and triple blinks from EOG signals using high‑pass and notch IIR filters with envelope detection. | Blinky-Keys-Serial.ino |
| Implements a BLE HID keyboard that sends right‑arrow on double blinks and left‑arrow on triple blinks to control slides in a presentation. | Blinky-Keys-BLE.ino |
| Implements a BLE gamepad that reads EEG and EMG signals to control games on Windows, using focus and muscle contractions. | BCI-BLE-Gamepad.ino |
All BLE-enabled or peripheral-using sketches follow a shared 6-LED NeoPixel convention so the board behaves predictably across firmware variants.
| LED | Standard Role | Colors |
|---|---|---|
| LED 1 | BLE / Wi-Fi connection status | GREEN = connected · RED = disconnected · BLUE = actively streaming data |
| LED 2 | General purpose | Sketch-specific |
| LED 3 | General purpose | Sketch-specific |
| LED 4 | I²C peripheral status | GREEN = device found · RED = device missing |
| LED 5 | General purpose | Sketch-specific |
| LED 6 | Battery level | GREEN > 70 % · ORANGE 20–70 % · RED < 20 % |
Sketches that follow this convention: BLE-BCI-Car-Remote · BCI-BLE-Gamepad · Blinky-Keys-BLE · NPG-Mouse-BMI270 · NPG-Mouse-MPU6050 · Wheelchair-Sim
Sketches that do not use this convention:
| Sketch | Reason |
|---|---|
Serial-FFT · BLE-Server · BLE-Client · BLE-BCI-Car · Blinky-Keys-Serial · Relay-Client · 1CH-HCI-BCI-Serial |
Not needed |
BCI-Blink-BLE · BCI-Blink-Serial · BCI-IR-Send · BCI-Relay-Server · BLE-BCI-Server-Toggle · Gyro-Motion-Detection · NPG-TELLO-Drone |
All LED occupied and |