A small list of tips and tricks I find myself needing when working with CircuitPython.
Microfarad [µF] Nanofarad [nF]
- 0.01 µF 10 nF
- 0.1 µF 100 nF
- 1 µF 1000 nF
- 2 µF 2000 nF
- 3 µF 3000 nF
- 5 µF 5000 nF
- 10 µF 10000 nF
- 20 µF 20000 nF
- 50 µF 50000 nF
- 100 µF 100000 nF
- 1000 µF 1000000 nF
How to Convert Microfarads to Nanofarads:
- 1 µF = 1000 nF
- 1 nF = 0.001 µF
InvenTree is an open-source Inventory Management System which provides powerful low-level stock control and part tracking. The core of the InvenTree system is a Python/Django database backend which provides an admin interface (web-based) and a JSON API for interaction with external interfaces and applications.
InvenTree is designed to be lightweight and easy to use for SME or hobbyist applications, where many existing stock management solutions are bloated and cumbersome to use. Updating stock is a single-action process and does not require a complex system of work orders or stock transactions.
Has a mobile app.
Look in https://github.com/Zeigren/inventree-docker/blob/master/inventree_vhost.conf to see how to proxy it with Nginx.
Digikey's choose-your-own-adventure subsite for identifying connectors.
An open source firmware for DSO-138 oscilloscope, based on the ARM Cortex M3 STM32F103 processor core. The firmware adds two analog channels, two digital channels (if you patch onto pins PA13 and PA14 on the board), a serial interface (over USB, probably), selectable source triggers, support for a retrofitted rotary encoder, and 2k sample depth. The tradeoff is that 10 µs sampling had to be removed to make room.
To flash the firmware you have to use a TTL-to-USB converter to patch directly onto jumpers J1 and J2 on the mainboard. No USB support, remember?
How to build your own programming cable for Leixen ham radios (the VV-898 in particular).
Archived.
WikiChip is the preeminent resource for computer architectures and semiconductor logic engineering, covering historical and contemporary electronic systems, technologies, and related topics.
I don’t want this to be Vega’s Opinionated Big Ass Book To Give You An All-In-One Education, both because VegaOpBABTGYAAIOEdu is far less catchy, and because I don’t even think it’s possible. The more I write on this the more I value input of others and other resources I find, and the more happy I am that I called this project Opinionated Guides.
A Guide. That’s what I want this to be. I want OpGuides to be a resource that’s like your friend you can come back to for advice on where to go next, and I think that’s something the internet really needs. Search engines are were awesome for finding information, but only when you know what to look for, so I figure OpGuides can be a sort of curated information source, with the crappy results filtered out, the best resources I know of included, and a healthy mix of entertainment in the education so that it’s not a chore to read.
Turn a Raspberry Pi into an oscilloscope. Probes attach to the GPIO pins.
John Deere has overly strict security on the electrical components of its tractor which doesn’t allow the owner of a tractor to make simple repairs or upgrades without having a John Deere technician travel out and do it for them. Our team has been tasked with decoding the CAN bus messages passed between tractor components, with this knowledge future work on modifying the tractor’s electronic systems will be significantly easier. The project is through California Polytechnic State University’s Capstone I/II class and sponsored by iFixit. Material on this site is protected from DMCA takedown by a DMCA exemption granted by the US Copyright Office.
This GPIO Pinout is designed to be both a quick and interactive reference to the Raspberry Pi GPIO pins, plus a comprehensive guide to your Raspberry Pi's GPIO interfaces. It also includes dozens of pinouts for Raspberry Pi add-on boards, HATs and pHATs.
Kit Space (formerly called Kitnic) is a registry of open hardware electronics projects that are ready for you to order and build. It could be described as a "Thingiverse for electronics". Click on any project to get further info, download the Gerbers and see the bill of materials.
Click once, order everything.
A 100% compatible replica of the famed SB 1.0 sound card. 8-bit ISA card. Full bill of parts. Even has a hex dump which turns an Atmel 89S51 into an 80C51 DSP chip (if you don't feel like buying one from China).
CC-BY-SA v4.0.
A directory of known Arduino shields.
A page that talks about passive and active sonar sensors. Security uses, especially the seismics. Links to other books and DoD video footage. I think this would be useful for training as well as surveillance applications.