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umd-lhcb / rpi.burnin

Rasberry Pi Python modules for burn-in
BSD 2-Clause "Simplified" License
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Replicate and improve LVR monitor hardware/software #15

Closed CoffeeIntoScience closed 4 years ago

CoffeeIntoScience commented 5 years ago

Overview The LVR monitor Raspberry Pi was created for real-time monitoring of the Gen3 LVR outputs, housekeeping voltage rails, and temperatures. This task is to create a "mark 2" version with improved portability and, if possible, mechanical robustness.

The Monitor as it presently exists consists of several pieces

  1. Raspberry pi model "1 A+" or newer with 5V adapter
  2. Interface (mouse/keyboard/monitor) for raspberry pi
  3. 4x ABElectronics ADC Pi (https://www.abelectronics.co.uk/p/69/adc-pi-raspberry-pi-analogue-to-digital-converter) with 1" shrouded right angle headers
  4. Custom built harness using 26-gauge stranded PTFE-insulated wire with CGRID-III crimp contacts and 1" housings keyed to match the headers
  5. Software based on the libraries available from ABElectronics with modifications by PMH for faster sampling of all 28 channels

Parts For this project, all physical materials except for the crimping tools and contacts will likely need to be purchased. It is probably best to compile a shopping list from Amazon and DigiKey that the Professors can approve and Sally can purchase.

Improvements As noted above, a goal of this is to move beyond simply having a copy to have an improved version. Areas of focus are portability and ground isolation. The Raspberry Pi plugged into a standard 5V micro USB adapter (can be purchased bundled) is a floating ground island. I'd like to keep it that way. One way to do this is a screen powered over a AC/DC converter, as those typically do not have a wall ground connection. Anything you can find powered off of a two-prong cord is essentially what we'd be looking for, give or take. Keep in mind portability is desired. The Raspberry Pi community has a lot of support and ideas floating around, steal steal steal! There's everything from all-in-one screen and keyboard combos to tablet-like interfaces. Ideally you could come up with a couple proposals priced out we could choose from.

The one I had before that broke is https://www.amazon.com/dp/B00Q7BA6E6/?coliid=IAFC4KUVQHC98&colid=1E7GM67MZDCS8&psc=0&ref_=lv_ov_lig_dp_it If you can find something similar from a reliable brand with better reviews that could work.

The labor-intensive part of this is copying the wiring harness. I will attach a schematic to this issue.

CoffeeIntoScience commented 5 years ago

PDF of monitoring harness schematic added to lvr_mon subfolder

SummerLeaves commented 4 years ago

Wire Making Note: 24/72 wires cut and crimped. The 26 AWG wire supply has run out, so 24 was all that could be made for now.

yipengsun commented 4 years ago

Any comments on the progress of this project?

SummerLeaves commented 4 years ago

Hi @yipengsun (Sorry for the delayed response! I missed the initial email),

From what I remember of a conversation from the Fall 2019 (or early Spring 2020) semester, Phoebe found a connector that worked without the need to finish the crimping. The rest of the Pi portability issue was secondary to the board assembly project that we worked on in the spring.

yipengsun commented 4 years ago

Hmm, let's consider this fixed for now.