The bioamp-exg-pill's intro from matteliot

BioAmp EXG Pill is a small (2.54 X 1.00 cm) and elegant Analog Front End (AFE) board for BioPotential signal acquisition that you can use with any 5v Micro Controller Unit (MCU) with an ADC. It is capable of recording publication grade BioPotential signals like ECG, EMG, EOG, and EEG without the inclusion of any dedicated Hardware/Software filter, see BioAmp EXG Pill v0.7 intro video for more info. The v1.0 of BioAmp EXG pill provides even more flexibilty with configuration option for Gain, BandPass, Filter, and Electrodes.

Connection	Configuration

Basic Arduino Circuit	Electromyography (EMG)

Electrooculography (EOG) Horizontal	Electrooculography (EOG) Vertical

Electrocardiography (ECG) Lead 1	Electroencephalography (EEG)

Software

BioAmp EXG Pill works with any 5V microcontroller with an ADC like Arduino UNO/Nano or you can use dedicated 5v compatible ADC like ADS1115. To help with signal processing and cleaning you can use the included Arduino example sketches listed below.

No.	Program	Description
1	FixedSampling	Sample from ADC at a fixed rate for easy processing of signal.
2	EMGFilter	A 74.5 - 149.5 Hz band pass filter sketch for clean Electromyography.
3	ECGFilter	A 0.5 - 44.5 Hz band-pass filter sketch for clean Electrocardiography.
4	EOGFilter	A 0.5 - 19.5 Hz band-pass filter sketch for clean Electrooculography.
5	EEGFilter	A 0.5 - 29.5 Hz band-pass filter sketch for clean Electroencephalography.
6	EMGEnvelop	EMG signal envelop detection for robotics and biomedical applications.
7	LEDBarGraph	LED bar graph showing EMG amplitude.
8	ServoControl	Servo motor control with EMG.
9	HeartBeatDetection	Standard deviation based heart beat detection algorithm.
10	EyeBlinkDetection	EOG based eye blink detection.
11	DrowsinessDetection	Drowsiness detection using eye blink detection.
12	ClawController	Servo claw controller
13	EOGPhotoCaptureBLE	EOG based photo clicking machine using ESP32 BLE

To-Do:

No.	Program	Description
1	HeartRate	Heart rate calculation with ECG.
2	BrainWaves	Brain waves amplitude with FFT.
3	EOGController	EOG based eye movement detection (left/right) to create a game controller.

Hardware

BioAmp EXG Pill has been created using KiCad and all the design files can be found under hardware folder, including production Gerber files. Images below shows a quick overview of the hardware design.