Chords is an open-source toolkit developed by Upside Down Labs to transform Arduino-compatible boards into bio-potential data acquisition devices when paired with BioAmp hardware.
Note
You have to flash Arduino code to your hardware from the list below to use these tools.
Important
Make sure to select your board type in the firmware file for it to work properly.
Tip
Only use genuine board to avoid noisy (unusable) signals and connection issues.
| Board | Voltage | Channels | Resolution | SamplingRate | BaudRate | Code |
|---|---|---|---|---|---|---|
| Neuro Play Ground (NPG) Lite - Serial | 2V5 | 3-6 | 12-bit | 500 | 230400 | NPG-LITE-Serial.ino |
| Neuro Play Ground (NPG) Lite - BLE | 2V5 | 3-6 | 12-bit | 500 | - | NPG-LITE-BLE.ino |
| Neuro Play Ground (NPG) Lite - WiFi | 2V5 | 3-6 | 12-bit | 500 | - | NPG-LITE-WiFi.ino |
| STM32G4 Core Board | 3V3 | 16 | 12-bit | 500 | 230400 | STM32G4-CORE-BOARD.ino |
| STM32F4 Black Pill | 3V3 | 8 | 12-bit | 500 | 230400 | STM32F4-BLACK-PILL.ino |
| Arduino GIGA R1 (WiFi) | 3V3 | 6 | 16-bit | 500 | 230400 | GIGA-R1.ino |
| Raspberry PI Pico | 3V3 | 3 | 12-bit | 500 | 230400 | RPI-PICO-RP2040.ino |
| Arduino UNO R4 Minima/WiFi | 5V | 6 | 14-bit | 500 | 230400 | UNO-R4.ino |
| Arduino NANO Classic | 5V | 8 | 10-bit | 250 | 115200 | AVR-NANO-UNO-MEGA.ino |
| Arduino UNO R3 | 5V | 6 | 10-bit | 250 | 115200 | AVR-NANO-UNO-MEGA.ino |
| Arduino Genuino UNO | 5V | 6 | 10-bit | 250 | 115200 | AVR-NANO-UNO-MEGA.ino |
| Arduino MEGA 2560 R3 | 5V | 16 | 10-bit | 250 | 115200 | AVR-NANO-UNO-MEGA.ino |
| Maker Nano / Nano Clone (CH340) | 5V | 8 | 10-bit | 250 | 115200 | AVR-NANO-UNO-MEGA.ino |
| Maker UNO / UNO R3 Clone (CH340) | 5V | 6 | 10-bit | 250 | 115200 | AVR-NANO-UNO-MEGA.ino |
| MEGA 2560 Clone (CH340) | 5V | 16 | 10-bit | 250 | 115200 | AVR-NANO-UNO-MEGA.ino |
| ESP32-S3 | 3V3 | 16 | 12-bit | 500 | 230400 | ESP32-S3.ino |
Prebuilt binaries are published on the Releases page. Download the file matching your board:
| Board | File | How to flash |
|---|---|---|
| NPG Lite Serial (ESP32-C6) | Chords-NPG-LITE-Serial-ESP32C6.merged.bin | esptool / NPG-Lite-Flasher-Web, offset 0x0 |
| NPG Lite BLE (ESP32-C6) | Chords-NPG-LITE-BLE-ESP32C6.merged.bin | esptool / NPG-Lite-Flasher-Web, offset 0x0 |
| NPG Lite WiFi (ESP32-C6) | Chords-NPG-LITE-WiFi-ESP32C6.merged.bin | esptool / NPG-Lite-Flasher-Web, offset 0x0 |
| ESP32-S3 | Chords-ESP32-S3.merged.bin | esptool / NPG-Lite-Flasher-Web, offset 0x0 |
| STM32G4 Core Board (G431CB) | Chords-STM32G4-CORE-BOARD.bin | STM32CubeProgrammer / DFU, 0x08000000 |
| STM32F4 Black Pill (F401CC / F411CE) | Chords-STM32F401CC-BLACK-PILL.bin / Chords-STM32F411CE-BLACK-PILL.bin | STM32CubeProgrammer / DFU, 0x08000000 |
| Arduino GIGA R1 | Chords-GIGA-R1.bin | dfu-util |
| Raspberry Pi Pico | Chords-RPI-PICO-RP2040.uf2 | Hold BOOTSEL, drag & drop the .uf2 |
| Arduino UNO R4 Minima / WiFi | Chords-UNO-R4-MINIMA.bin / Chords-UNO-R4-WIFI.bin | bossac / Arduino IDE |
| Arduino UNO R3 | Chords-UNO-R3.bin | avrdude -U flash:w:<file>:r |
| Arduino Nano Classic | Chords-NANO-CLASSIC.bin | avrdude -U flash:w:<file>:r |
| Arduino MEGA 2560 R3 | Chords-MEGA-2560-R3.bin | avrdude -U flash:w:<file>:r |