Difference between revisions of "Data Logger"

From PaparazziUAV
Jump to: navigation, search
Line 3: Line 3:
 
This page describes various '''onboard''' external devices called a "Data logger", that can be connected to the Paparazzi autopilot.  
 
This page describes various '''onboard''' external devices called a "Data logger", that can be connected to the Paparazzi autopilot.  
  
Such a Data Logger device can be used to store telemetry data to a storage medium on board the aircraft. Such a storage medium can be an SD card or a Flash chip.  For now logging is '''not''' done directly by the autopilot itself as the usage of a file system as well as possible lag you might get with a SD storage speed does not fit well with the real-time nature of Autopilots.
+
Such a Data Logger device can be used to store telemetry data to a storage medium on board the aircraft. Such a storage medium can be an SD card or a Flash chip.  Logging can eventually be done by the autopilot itself if it is using a (RT)OS and can eventually handle a file system without interfering with the control and navigation tasks.
  
 
Note that not all loggers accept SD HighCapacity(SDHC) cards as storage
 
Note that not all loggers accept SD HighCapacity(SDHC) cards as storage
Line 11: Line 11:
 
One would naturally first ask; why on on-board logger when we have data over the air?
 
One would naturally first ask; why on on-board logger when we have data over the air?
  
The answer to this is multi-fold; Sometimes it is not possible to log everything over the air because of speed, lag and datavolume limitations of data send wireless over the air. Or one needs to log when there is no telemetry at all in long distance flight. Or one want to log all the RAW IMU data to debug specific scenarios.
+
The answer to this is multi-fold; Sometimes it is not possible to log everything over the air because of speed, lag and volume limitations of data send wireless over the air. Or one needs to log when there is no telemetry at all in long distance flight. Or one want to log all the RAW IMU data to debug specific scenarios.
  
 
To solve this issue, there are various loggers that can be connected to your Paparazzi Autopilot board.
 
To solve this issue, there are various loggers that can be connected to your Paparazzi Autopilot board.
Line 19: Line 19:
 
There are numerous logging solutions, both with their pro's and con's; here the options:
 
There are numerous logging solutions, both with their pro's and con's; here the options:
  
==* [[twoga-Logga|TWOGA-Logga]]==
 
==* [[twoglogdedicated|An dedicated TWOG board for logging]]==
 
==* [[Openlog|Openlog]]==
 
 
==* [[SDLogger_SPI_Direct|SD Logger SPI Direct]]==
 
==* [[SDLogger_SPI_Direct|SD Logger SPI Direct]]==
 
==* [[Micro_logger|Micro Logger]]==
 
==* [[Micro_logger|Micro Logger]]==
 
==* [[file_logger|File Logger (Bebop)]]==
 
==* [[file_logger|File Logger (Bebop)]]==
 +
==* [[Apogee/v1.00#On-board_Data_Logging|On-board data logger for Apogee autopilot]]==
 +
==* [[Openlog|Openlog]]==
 +
==* [[twoga-Logga|TWOGA-Logga]]==
 +
==* [[twoglogdedicated|An dedicated TWOG board for logging]]==
  
 
=Storage format=
 
=Storage format=

Revision as of 08:22, 11 January 2017

Introduction

This page describes various onboard external devices called a "Data logger", that can be connected to the Paparazzi autopilot.

Such a Data Logger device can be used to store telemetry data to a storage medium on board the aircraft. Such a storage medium can be an SD card or a Flash chip. Logging can eventually be done by the autopilot itself if it is using a (RT)OS and can eventually handle a file system without interfering with the control and navigation tasks.

Note that not all loggers accept SD HighCapacity(SDHC) cards as storage

Why Onboard

One would naturally first ask; why on on-board logger when we have data over the air?

The answer to this is multi-fold; Sometimes it is not possible to log everything over the air because of speed, lag and volume limitations of data send wireless over the air. Or one needs to log when there is no telemetry at all in long distance flight. Or one want to log all the RAW IMU data to debug specific scenarios.

To solve this issue, there are various loggers that can be connected to your Paparazzi Autopilot board.

Available Data logger options

There are numerous logging solutions, both with their pro's and con's; here the options:

* SD Logger SPI Direct

* Micro Logger

* File Logger (Bebop)

* On-board data logger for Apogee autopilot

* Openlog

* TWOGA-Logga

* An dedicated TWOG board for logging

Storage format

A more unified method of storing data on the logger, info available here