CAN шина. Часть 2

Часть первая

Хотя CAN шина довольно неприхотливая, ввиду множества защит и механизмов, но поскольку она может работать на высоких скоростях и больших расстояниях, то важным моментом является грамотное ее проектирование. В частности правильное терминирование оконечных устройств или перегрузка из-за количества устройств. Из-за которых возникает большинство проблем в шине.

▌Количество устройств
Когда то давно стандарт предписывал 32 устройства на шине. Но было это очень давно и сейчас таких ограничений нет. Все теперь зависит от нагрузочной способности самого слабого трансивера на шине. Чтобы понять о чем речь надо рассмотреть внутреннее устройство трансивера:

Обратите внимание на устройство выходного каскада. В свободном (рецессивном) состоянии выводы CANL и...

Электроника для всех

Posted at 2023-05-01 13:23:16 | Electronics | read on

Free Stuff - March 2023

The March recipient for the Great Scott Gadgets Free Stuff Program is Jan. Jan is the author and maintainer of RadioLib, an open-source library for embedded devices controlling various wireless radio modules like SX1276, CC1101 or RF69.

We are sending Jan a HackRF One to aid in the development of RadioLib. Until now, Jan has been doing development using an RTL dongle. The lack of TX ability, and other issues, have made the dongle a bit less than practical. We hope the HackRF One helps, and we look forward to watching this project continue to evolve!

Great Scott Gadgets

Posted at 2023-05-01 12:00:00 | Electronics | read on

A WiFi color Eink picture frame

Give away picture frames that always have an up-to-date picture!

Sprites mods

Posted at 2023-04-23 00:00:00 | Electronics | read on

A WiFi color Eink picture frame

Give away picture frames that always have an up-to-date picture!

Sprites mods

Posted at 2023-04-23 00:00:00 | Electronics | read on

A WiFi color Eink picture frame

Give away picture frames that always have an up-to-date picture!

spritesmods.com

Posted at 2023-04-23 00:00:00 | Electronics | read on

И снова модернизация блока питания Dazheng PS-305D

Спустя 10 лет после публикации первой статьи по доработке лабораторного блока питания Dazheng PS-305D (известного так же как Ya Xun Ps-305d и Yizhan PS-305D, а так же, наверняка, и под другими именами), пришлось снова заняться этим аппаратом. У китайского ЛБП обнаружилась проблема с переменными резисторами, которые начали “шуршать”, от чего выставляемые значения тока и напряжения начали “скакать”. После чего резисторы были заменены на новые, модные, точные и многооборотистые с одной неназываемой китайской барахолки. С этими новыми резисторами - оригинальными, качественными и практически японскими (эти характеристики взяты из описания товара и...

TrolSoft

Posted at 2023-04-20 16:33:12 | Electronics | read on

Cynthion Hardware Design Update

Note: This is a crosspost of a Cynthion update on Crowd Supply: https://www.crowdsupply.com/great-scott-gadgets/cynthion/updates/cynthion-hardware-design-update.

We’ve completed the Cynthion r0.6 design! As mentioned in previous updates we needed to modify the design to accommodate new components due to supply chain issues. In this revision additional changes were made to resolve some problems beta testers identified with both power input and power output.

Issues Found During Beta Testing

Power input issues: When you plug Cynthion into a host computer, it is expected that Cynthion powers up and that the host computer will recognize that a device has been attached. Our beta testers found a couple of...

Great Scott Gadgets

Posted at 2023-04-14 00:00:00 | Electronics | read on

Linkdump: April 2023

The CRUMB Circuit Simulator, a breadboard simulator Deep Fried Coffee Beans Conserve the Sound: “Your Museum for endangered sounds.” Furby source code What is the price of a Big Mac across the country? Floppy disk costumes for SD cards De visdeurbel (Fish Doorbell; Dutch language.) When a fish in the canals needs the lock opened, you can send the lock keeper a photo to let them know. Near infrared, in situ imaging of chips: An inexpensive method to see inside certain types of integrated circuits. An Aperiodic Monotile, and a talk about it, from the National Museum of Mathematics. The Tabloid Programming languate, and an implementation in Racket. The Electronics...

Evil Mad Scientist Laboratories

Posted at 2023-04-13 16:07:56 | Electronics | read on

A new design

As it was teased with the March update and the December blog post of last year, there is a community website redesign being worked on. Launched at beta.pine64.org we’re proud to give a very early insight of what the redesign currently looks like.

PINE64

Posted at 2023-04-13 00:00:00 | Electronics | read on

PineTab-V and PineTab2 launch

The PineTab2 and PineTab-V pre-orders begin on April 13th. Both tablets feature a 1200x800 10.1” IPS LCD panel with wide viewing angles, a sturdy metal metal chassis, two USB-C ports (1x USB 3.0, 1x USB 2.0 with charging), a digital video out port, a front 2MPx and rear 5MPx camera as well as a 6000mAh battery.

PINE64

Posted at 2023-04-10 00:00:00 | Electronics | read on