We just pushed the V1.2 of the Beechat Crank to our GitHub @beechatnetwork2 Beechat Crank is a human-powered, open-hardware, fully-waterproof, electricity generator. The project was born out of the need to power electronics in all off-grid scenarios. We needed a way to power our devices in all weather conditions, and making a human-powered generator meant that problem could be solved. When we looked for a solution, we didn't find what we were looking for, so we decided to make it, and make it open source! https://github.com/BeechatNetworkSystemsLtd/BeechatCrank/ Features High power (3A) USB-C IPX8 output 18650 3600 mAh battery (LG M36) Charging time of 4 hrs 24 min. to full charge with 10% efficiency loss at 4.5 Watts. Overcharge protection Parts Beechat Crank is composed of the main device, which we call the Heart. It contains the battery, the generator and all the electronics (the handle is detachable) The Pedal Case is an assembly which the Heart can be attached in. which dramatically speeds up the charging from 2.5 hours to 25-30 minutes. This is achieved with reduction gears to, with the same revolutions per minute, generate more electricity. Generator part We have chosen the 35L048B1B motor with a mass of 88 grams, giving us us 450 mA for each phase of the coil and works at 5V. The wire leads are connected via female Molex connectors to the charging PCB board. New modifications: * Added a Molex type connector to the PCB to connect the motor. * The Zener diodes were changed, by means of a rectifier bridge. * A new and improved Texas Instruments brand battery management chip was selected. * Added a boost converter to allow different voltage batteries. * New Portescap brand two-phase generator with 90% efficiency and peak power of 4.5 Watts was selected. #crank#beechat
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Источник @procode404 · Post #3246 · 24 сент.
🧑🏫Изучаем популярный на собеседованиях алгоритм — [31:22] Ни для кого не секрет, что знание алгоритмов — очень важная вещь для успешного прохождения технического собеседование в большую часть IT-компаний (особенно таких, как Яндекс или Google). При этом нередко на собеседованиях бывают задачи, где поступают некоторые запросы на отрезке. Например, запросы на сумму. С одной стороны, любому новичку в программировании будет очевидно, как с этим справиться: просто пройтись по отрезку и посчитать сумму элементов на нём. Но зачастую — это не то, чего ждут от собеседуемого. Чаще ожидают решение, которое может отвечать на каждый вопрос "моментально" (для тех, кто знаком с обозначениями, за O(1) времени). В этом небольшом видео автор понятным языком расскажет, как просто и эффективно можно обрабатывать такие запросы. #алгоритмы#собеседование
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Last weekend we presented the Beechat Rune device for the very first time, as part of the Volla Community days in Germany. Featuring 4 simultaneous streams, capable of audio and video streams with next-gen CRYSTALS cryptography, the Beechat Rune is a perfect addition to privacy-focused systems. @beechatnetwork2 #beechat#mesh#p2p