View source for Digital Event Recorder

==Introduction==
The Digital Event Recorder is a device for recording timing pulses used for synchronizing several devices and is developed by the [[Technical Support Group]]. The device is based on a Raspberry Pi. The software on the raspberry pi is developed by Günter Windau. 

The device has isolated inputs that can register trigger pulses from other devices. The incoming pulses are timestamped and can be used afterwards for synchronization of data collected from different devices. The device has an Ethernet connection and can be instructed and read out by your MATLAB program. The MATLAB software for the device is available in the biofysica repository on [[Gitlab]].

The synchronization is based on Lab Streaming Layer (LSL). This protocol has a built-in timing facility which is designed to achieve sub-millisecond synchronization on a local network.

==2 Channel Mobile Event Recorder==
A compact Mobile Event Recorder for special use with audio signal onset detection is in development by Günter Windau.

[[File: Mobile_Event_Recorder.jpg|thumb|Mobile event recorder]]
==4 Channel Mobile Event Recorder==
The mobile event recorder is a 4 channel event recorder based on a raspberry Pi 4. The functionality is the same as the standard 19" rack [[8 channel digital event recorder|event recorder]].

There are 2 devices of this type:
*LSLDER06
*LSLDER07

[[File:Digital_Event_Recorder_(8_channel).jpg|thumb|8 channel digital event recorder (rack version)]]
[[File:Digital_Event_Recorder_8_channels_(2).jpg|thumb|digital event recorder with open case]]

==8 Channel Event Recorder==
The 8 channel digital event recorder is a 1U 19" rack version of the device.

*Synchronization of pulses: jitter < 1 ms.

There are 5 devices of this type in use in the labs:
{| class="wikitable"
! Name
! Location
|-
| LSLDER01
| Vestibular chair
|-
| LSLDER02
| Auditory Perception Lab
|-
| LSLDER03
| Auditory Motion Lab
|-
| LSLDER04
| NIRS-EEG Lab
|-
| LSLDER05
| Auditory Sphere Lab
|}