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2 layers70.5 × 33.7 mmTi based, the printed circuit board in 3D

RatEEG is 4 channel EEG device for iSeizure project

Size
70.5 × 33.7 mm
Copper layers
2
Thickness
1.6 mm
Parts
73
Nets
55
Pads
246
Tracks, vias
537, 37
Pours
2
Routed
Yes
KiCad
KiCad 5 (file 20171130)
Created
31 Mar 2019
Updated
7 May 2019

Overview

Ti based is an open-source printed circuit board by tharaka27, from the tharaka27/RatEEG repository on GitHub, published under the MIT licence. It is a 2-layer board of 70.5 × 33.7 mm with 73 parts on 55 nets, routed with 537 tracks and 37 vias.

It is built around the ADS1299-4PAGR and LM2664M6X. Its parts include 50 capacitors, 14 resistors, 5 ICs, 3 connectors and 1 diode.

Main components

2

README

README.md

We have moved to the new version of RatEEG. You can find it on https://github.com/tharaka27/RatEEG-V2
This files will not be maintained further

Capture

Problem Tackling

Epilepsy is one of the most common neurological disorders and occurs with an incidence of 68.8/100,000  person-years. The age-adjusted incidence of epilepsy is estimated to be 44/100,000 person-years.  Despite the introduction of new antiepileptic drugs in the last decades, one-third of people with epilepsy  continue to have seizures despite treatment.  However, even when seizures are well controlled, self-reported quality of life is significantly lowered by the  anxiety associated with the unpredictable nature of seizures and the consequences therefrom. Some of the  difficulties in managing treatment-refractory epilepsy can be ameliorated by the ability to detect clinical  seizures.   This information might be useful both in developing accurate seizure diaries and in providing therapies during  times of greatest seizure susceptibility. The ability to rapidly and accurately detect seizures could promote  therapies aimed at rapidly treating seizures. The capability to detect seizures early and anticipate their onset  prior to presentation would provide even greater advantages. These early detection and prediction s ystems  might be able to abort seizures through targeted therapies. Such systems would also be able to prevent  accidents and limit injury. 

Solution

Typically seizures are detected by analyzing the electroencephalogram (EEG), but obtaining it outside the  hospital is too difficult for long-term monitoring. The electrocardiogram (ECG) is however easily  obtainable in a home environment. Earlier studies showed that most tonic-clonic (TC) seizures are  accompanied by a specific heart rate (HR) pattern.    This project was started as our 2nd year semester project of the Computer Science and Engineering  Department, the University of Moratuwa in February 2019. The device with EEG was designed by us under   Dr Shantha Fernando (Consultant Neurologist).    

Our target is to build a portable 4-channel EEG along with heart rate sensor  So the final project will be a    

“Low-cost wearable device to identify Tonic-clonic seizure using 4 channel EEG and heartbeat” 

Background

There are devices in the market which detects seizure like Nightwatch which is based on non-EEG devices.  These competitive devices are based on ECG or heartbeat pattern. One key disadvantage of the Nightwatch device is as it is a non-EEG device, the false positive rate is very  high. Even for cold or after a long run your heart rate pattern can be identified as a seizure pattern. The only  way to detect tonic-clonic seizure is to use an EEG device.   The key advantage of our device is that it is has a portable 4-channel EEG device which is specially  designed for tonic-clonic seizure. This device will detect and Inform people nearby and also parents.  

What should I know to contribute?

Electronics, PCB designing and Firmware development. App development.

Target?

Target is to create a wearable EEG device which connects to owners phone and inform him in case of a seizure forehand.

How can I contribute?

Please check the issues section. As I am not an expert in PCB designing my design is a mess. It's better if someone can make it better. And a desktop app should be made for debugging of device.

Work flow

  • schematic designing the EEG module
  • PCB print
  • Writing firmware
  • Desktop application for debugging
  • Android/ios app



RatEEGv1 0

Parts

73
QtyValueFootprintReferences
141uFCapacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolderC1, C6, C8, C12, C35, C38, C39, C40, C41, C43, C44, C45, C47, C50
131MResistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolderR1, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14
124.7nFCapacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolderC13, C14, C17, C18, C19, C20, C21, C22, C24, C25, C26, C28
72.2uFCapacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolderC5, C9, C11, C16, C27, C29, C31
510uFCapacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolderC2, C3, C30, C33, C37
40.1uFCapacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolderC4, C7, C10, C15
4100nFCapacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolderC34, C36, C42, C49
2100uFCapacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolderC46, C48
210nFCapacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolderC23, C32
2Conn_01x12_FemaleConnector_PinHeader_2.00mm:PinHeader_1x12_P2.00mm_VerticalJ2, J3
1ADS1299-4PAGRADS1299-4PAGR:QFP50P1200X1200X120-64NIC3
1Conn_01x02_FemaleConnector_PinHeader_2.00mm:PinHeader_1x02_P2.00mm_VerticalJ1
1LEDLED_SMD:LED_0603_1608MetricD1
1LM2664M6XLM2664M6X:SOT95P280X145-6NIC1
1MCP1754-3302E_SOT89MCP1754ST-3302E_MC:SON50P300X200X100-9N-DU1
1RResistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolderR2
1TLV70025_SOT23-5TLV70025DSET:SON50P150X150X80-6NU2
1TPS72325DBVTTPS72325DBVT:SOT95P280X145-5NIC2

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Questions

How big is the Ti based PCB?

It measures 70.5 × 33.7 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Ti based use?

73 parts, built around the ADS1299-4PAGR and LM2664M6X. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Ti based KiCad files?

From the tharaka27/RatEEG repository on GitHub, at the commit this page was made from: the board is Schematic/ti_based.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Ti based design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).