https://github.com/cristian-bicheru/zero-daq-software

Data acquisition software used to cold flow and static fire the Zero engine.
https://github.com/cristian-bicheru/zero-daq-software

Last synced: about 1 month ago
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Data acquisition software used to cold flow and static fire the Zero engine.

• Host: GitHub
• URL: https://github.com/cristian-bicheru/zero-daq-software
• Owner: cristian-bicheru
• Created: 2024-01-25T05:40:17.000Z (10 months ago)
• Default Branch: master
• Last Pushed: 2024-02-13T19:05:50.000Z (9 months ago)
• Last Synced: 2024-02-13T20:24:55.455Z (9 months ago)
• Language: Python
• Size: 425 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Zero Test Bench Software Stack

Author: Cristian Bicheru

For questions, feel free to reach out to `[email protected]`.

## Introduction

The hardware stack consists of a laptop and a Raspberry Pi 4B. Each device has

its own software located in the appropriate directories. ZeroMQ is used to link

the monitor software on the laptop to the controller software on the Pi. Onboard

sensors and their settings are defined in `sensors.cfg`.

`zerolib` is a library containing code used by both the monitor and the

controller.

The `Engine Test Programs` directory contains valve throttle profiles to be

executed during a cold flow or static fire test. The format is a 4 column

csv file. The first column is the time (in seconds) since the test begins, the

second column holds the desired fuel valve throttle position and the third column

holds the desired oxidizer valve throttle position at this timestep. The last

column controls the torch ignitor state. A 1 turns the ignitor on at this

timestep and a 0 turns it off. Between timesteps, the throttles are linearly

interpolated based on the current time.

## Testing Procedure

Once the all of the hardware is setup, an ethernet link should be established

between the laptop and the Raspberry Pi. Then, the battery pack is connected to

the electrical box.

At this point, an SSH link is established to the Pi. The `pigpiod` service is

started using `./start_pigpiod.sh`. Then, the controller is started with

`./start_controller.sh`. Once the controller software is finished initializing,

the monitor should begin to show live data collected from the controller. Any

warnings/errors from the Pi are shown either in the SSH console or the monitor

software.

## Pi Setup

To improve the reliability and performance of the Pi, it is running a custom

compiled kernel with `PREEMPT_RT` enabled. The Pi is also overlocked to 2 GHz.

## Video Feed

To establish a live camera feed, connect an android phone to the Pi via USB and

run the `./start_camera.sh` command. This will forward the 8080 port on the

phone to 8081 on the Pi. A camera server (e.g. IP Webcam) can then be run on the

phone (broadcasting on port 8080) and accessed on the laptop.