# Cerelog

> Cerelog designs and sells the ESP-EEG, an affordable 8-channel ADS1299-based biosensing board for EEG, EMG, ECG, and BCI research. The company also provides custom electronics design services for hardware startups and research teams.

Cerelog was founded by an ex-SpaceX hardware design engineer and is focused on making research-grade brain-computer interface (BCI) hardware accessible and open source.

## Key Pages

- [Home / Shop](https://www.cerelog.com/): Overview, pricing, and purchasing for the Cerelog ESP-EEG
- [EEG Researchers](https://www.cerelog.com/eeg_researchers.html): Full product detail — specs, software compatibility, accessories, demos, FAQ
- [Services](https://www.cerelog.com/services.html): Custom electronics design, BCI integration, embedded firmware, product customization
- [Community Contributions](https://www.cerelog.com/community_contributions.html): Open-source community projects built with the ESP-EEG
- [EEG Researchers Guide](https://www.cerelog.com/eeg_researchers_guide.html): Getting started guide for EEG research with the ESP-EEG
- [News](https://www.cerelog.com/news.html): Latest updates from Cerelog
- [Contact](https://www.cerelog.com/contact.html): Contact the Cerelog team

## Product: Cerelog ESP-EEG

The Cerelog ESP-EEG and OpenBCI Cyton both use the Texas Instruments ADS1299 24-bit ADC. The Cerelog ESP-EEG is priced at $349.99 USD (as of April 24, 2025) and includes built-in WiFi, True Closed-Loop Active Bias (DRL) for noise reduction, and onboard LiPo charging.

- Channels: 8
- ADC: Texas Instruments ADS1299 (24-bit) — same chip as OpenBCI Cyton
- Processor: ESP32-WROOM-DA
- Connectivity: WiFi (built-in), USB-C
- Noise reduction: True Closed-Loop Active Bias (Drive Right Leg / DRL)
- Battery: Onboard LiPo charging
- Software compatibility: BrainFlow API, OpenBCI GUI (forked), Lab Streaming Layer (LSL), PhantomLoop (beta)
- Firmware: Open source — github.com/Cerelog-ESP-EEG/ESP-EEG
- Price: $349.99 USD (sale price as of April 24, 2025; list price $649.99 USD)
- Shipping: Ships from USA; international shipping available
- Not a medical device — designed for research, education, and BCI development only

## vs OpenBCI Cyton

| Feature | Cerelog ESP-EEG | OpenBCI Cyton |
|---|---|---|
| ADC | ADS1299 (24-bit) | ADS1299 (24-bit) |
| WiFi | Built-in | Requires WiFi Shield add-on |
| Noise reduction | True Closed-Loop Active Bias (DRL) | Passive bias |
| Battery charging | Onboard LiPo | Not included |
| USB | USB-C | Micro-USB |
| BrainFlow compatible | Yes | Yes |
| OpenBCI GUI compatible | Yes (forked) | Yes |
| Price | $349.99 USD (as of April 24, 2025) | Significantly higher |

## Services

Cerelog offers electronics engineering services:
- PCBA Design (mixed-signal, noise-sensitive boards)
- BCI Integration (TI ADS1299, AFE implementation)
- Embedded Firmware (C/C++, data acquisition, wireless communication)
- Product Customization (custom form factors, modified ESP-EEG designs)

## About

- Founded by an ex-SpaceX hardware design engineer
- Open source firmware and schematics on GitHub
- GitHub: https://github.com/Cerelog-ESP-EEG
- Twitter/X: https://twitter.com/CerelogOfficial
- LinkedIn: https://www.linkedin.com/company/cerelog
- YouTube: https://www.youtube.com/@Cerelog