{"id":31332,"date":"2019-10-31T21:40:44","date_gmt":"2019-10-31T18:40:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kak-raskrutit-novichka-i-nichego-ne-slomat\/"},"modified":"2019-10-31T21:40:44","modified_gmt":"2019-10-31T18:40:44","slug":"kak-raskrutit-novichka-i-nichego-ne-slomat","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/kak-raskrutit-novichka-i-nichego-ne-slomat","title":{"rendered":"Hogy lehet egy \u00fajoncot felk\u00e9sz\u00edteni an\u00e9lk\u00fcl, hogy b\u00e1rmit is elt\u00f6rn\u00e9nk","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A keres\u00e9s, interj\u00fa, tesztfeladat, kiv\u00e1laszt\u00e1s, felv\u00e9tel, beilleszked\u00e9s \u2014 ez az \u00fat neh\u00e9z \u00e9s mindannyiunk sz\u00e1m\u00e1ra \u00e9rthet\u0151 \u2014 mind a munk\u00e1ltat\u00f3, mind a dolgoz\u00f3 sz\u00e1m\u00e1ra.<\/p>\n

A kezd\u0151 nem rendelkezik a sz\u00fcks\u00e9ges szakmai kompetenci\u00e1kkal. M\u00e9g a tapasztalt szakembernek is \u00e1t kell szerveznie mag\u00e1t. A vezet\u0151t nyomasztj\u00e1k a k\u00e9rd\u00e9sek, hogy milyen feladatokat adjon az \u00faj dolgoz\u00f3nak az elej\u00e9n, \u00e9s mennyi id\u0151t sz\u00e1njon ezekre? K\u00f6zben biztos\u00edtania kell az \u00e9rdekl\u0151d\u00e9st, elk\u00f6telezetts\u00e9get, dinamizmust \u00e9s integr\u00e1ci\u00f3t. De nem szabad kock\u00e1ztatni a kritikus \u00fczleti feladatokkal.<\/p>\n

\"Hogy
\n<\/a><\/noindex>
\nEnnek \u00e9rdek\u00e9ben bels\u0151 v\u00e1lt\u00e1si projekteket ind\u00edtunk. Ezek f\u00fcggetlen, r\u00f6vid szakaszokb\u00f3l \u00e1llnak. Az ilyen munk\u00e1k eredm\u00e9nyei alapot szolg\u00e1ltatnak a k\u00f6vetkez\u0151 fejleszt\u00e9sekhez, \u00e9s lehet\u0151s\u00e9get adnak a kezd\u0151nek, hogy megmutassa mag\u00e1t, \u00e9rdekes feladattal beilleszkedjen a csapatba an\u00e9lk\u00fcl, hogy kock\u00e1ztatn\u00e1 egy fontos projekt meghi\u00fasul\u00e1s\u00e1t. Itt tapasztalatot szerez, megismeri a koll\u00e9g\u00e1kat, \u00e9s lehet\u0151s\u00e9ge ny\u00edlik arra, hogy a legjobb oldal\u00e1t mutassa, amikor nincsenek szigor\u00fa korl\u00e1tok a legacy miatt.<\/p>\n

P\u00e9ldak\u00e9nt a v\u00e1lt\u00e1si fejleszt\u00e9s t\u00e9m\u00e1ja volt a rot\u00e1ci\u00f3s k\u00e9perny\u0151, amely a stroboszk\u00f3pos hat\u00e1s alapj\u00e1n k\u00e9sz\u00fclt, \u00e9s lehet\u0151s\u00e9get adott tetsz\u0151leges felhaszn\u00e1l\u00f3i dinamikus k\u00e9p megjelen\u00edt\u00e9s\u00e9re a telefon k\u00e9perny\u0151j\u00e9n. A protot\u00edpusok tal\u00e1lhat\u00f3k. itt<\/a><\/noindex>.<\/p>\n

A munk\u00e1kat folyamatosan t\u00f6bb munkat\u00e1rs v\u00e9gezte, \u00e9s \u00fajakkal folytat\u00f3dnak a beilleszked\u00e9s\u00fck ideje alatt (k\u00e9t h\u00e9tt\u0151l egy h\u00f3napig, a k\u00e9pess\u00e9gekt\u0151l \u00e9s kompetenci\u00e1k szintj\u00e9t\u0151l f\u00fcgg\u0151en).<\/p>\n

A szakaszok a k\u00f6vetkez\u0151ek voltak:<\/p>\n

a) a konstrukci\u00f3 megfontol\u00e1sa (a megl\u00e9v\u0151 mint\u00e1k tanulm\u00e1nyoz\u00e1s\u00e1val, anal\u00f3gok le\u00edr\u00e1s\u00e1val, kreat\u00edv kezdem\u00e9nyez\u00e9s megnyilv\u00e1nul\u00e1s\u00e1val);<\/p>\n

b) az alapelveknek megfelel\u0151 elektromos s\u00e9m\u00e1nak a megtervez\u00e9se \u00e9s a nyomtatott \u00e1ramk\u00f6r\u00f6n val\u00f3 elhelyez\u00e9se;<\/p>\n

c) a k\u00e9p telefonnal val\u00f3 \u00e1tviteli protokoll kidolgoz\u00e1sa a k\u00e9sz\u00fcl\u00e9kre;<\/p>\n

d) a Bluetooth LE-n kereszt\u00fcli vez\u00e9rl\u00e9s biztos\u00edt\u00e1sa a okostelefonr\u00f3l.<\/p>\n

A kezd\u0151 v\u00e1ltozat egy nagyon kompakt h\u00e1romszirm\u00fa p\u00f6rgetty\u0171 haszn\u00e1lat\u00e1t helyezte kil\u00e1t\u00e1sba, amely k\u00e9zi forgat\u00e1skor kezdett el feliratokat mutatni. Az egyik szirom tartalmazott egy BLE-modult, a m\u00e1sodik t\u00edz RGB LED-et, a harmadik egy optikai \u00e9rz\u00e9kel\u0151t, a k\u00f6z\u00e9pen pedig egy akkumul\u00e1tor volt. Elk\u00e9sz\u00fclt egy elvi \u00e1ramk\u00f6r, \u00e9s elv\u00e9gezt\u00fck az els\u0151 k\u00eds\u00e9rleteket. Nyilv\u00e1nval\u00f3v\u00e1 v\u00e1lt, hogy a k\u00e9pmin\u0151s\u00e9g nagyon alacsony, a felbont\u00e1s kicsi, a j\u00e1t\u00e9kos hat\u00e1s r\u00f6vid ideig tart, a lehet\u0151s\u00e9gek pedig szer\u00e9nyek. R\u00e1ad\u00e1sul a p\u00f6rgetty\u0171k olyan gyorsan elt\u0171ntek, ahogyan megjelentek. \u00dagy d\u00f6nt\u00f6ttek, hogy emelik a t\u00e9tet, \u00e9s fejlesztenek egy forgathat\u00f3 stroboszk\u00f3pos kijelz\u0151t. Ezt legal\u00e1bb gyakorlati c\u00e9lokra haszn\u00e1lhatn\u00e1k ki\u00e1ll\u00edt\u00e1sokon \u00e9s konferenci\u00e1kon, \u00e9s a k\u00f6zelj\u00f6v\u0151ben az ilyen megold\u00e1sok ir\u00e1nti \u00e9rdekl\u0151d\u00e9s nem cs\u00f6kken.<\/p>\n

A konstrukci\u00f3val kapcsolatos f\u0151 k\u00e9rd\u00e9sek a k\u00f6vetkez\u0151k voltak: hogyan helyezz\u00fck el a LED-eket (f\u00fcgg\u0151leges s\u00edkban, mint a fenti p\u00e9ld\u00e1n, vagy v\u00edzszintesben) \u00e9s hogyan t\u00e1pl\u00e1ljuk meg a forg\u00f3 LED-k\u00e1rty\u00e1t.<\/p>\n

Oktat\u00e1si c\u00e9lokra a LED-eket csak v\u00edzszintes s\u00edkban helyezt\u00e9k el. Ami a t\u00e1pl\u00e1l\u00e1st illeti, itt fontos v\u00e1laszt\u00e1s \u00e1llt el\u0151tt\u00fcnk: vagy egy nagy, zajos, de olcs\u00f3 kollektormotort haszn\u00e1lunk, vagy egy eleg\u00e1nsabb megold\u00e1st a t\u00e1vols\u00e1gi t\u00e1pl\u00e1l\u00e1sra k\u00e9t tekercs seg\u00edts\u00e9g\u00e9vel \u2013 az egyik a motoron, a m\u00e1sik a k\u00e1rty\u00e1n. Az eleg\u00e1ns megold\u00e1s term\u00e9szetesen dr\u00e1g\u00e1bb \u00e9s id\u0151ig\u00e9nyesebb, mivel el\u0151sz\u00f6r a tekercseket kellett kisz\u00e1m\u00edtani, majd megfonni (lehet\u0151leg nem k\u00f6znapi k\u00f6r\u00fclm\u00e9nyek k\u00f6z\u00f6tt).<\/p>\n

\"Hogy
\n\u00cdgy n\u00e9z ki a k\u00e9sz\u00fclt protot\u00edpus<\/i><\/p>\n

A t\u00f6megtermel\u00e9s saj\u00e1toss\u00e1ga, hogy minden plusz cent sz\u00e1m\u00edt a k\u00f6lts\u00e9gvet\u00e9sben. A siker sokszor egy mar\u00e9k passz\u00edv alkatr\u00e9sz \u00e1r\u00e1t\u00f3l f\u00fcgg. Ez\u00e9rt gyakran egy hat\u00e9konytalanabb, de olcs\u00f3bb megold\u00e1st kell v\u00e1lasztani, hogy a gy\u00e1rt\u00f3 meg tudja \u0151rizni kereskedelmi versenyk\u00e9pess\u00e9g\u00e9t. \u00cdgy a forg\u00f3 kijelz\u0151 t\u00f6meggy\u00e1rt\u00e1s\u00e1nak elind\u00edt\u00e1s\u00e1t elk\u00e9pzelve, a fejleszt\u0151 a kollektormotor mellett d\u00f6nt\u00f6tt.<\/p>\n

A prototype launched with a spark, made noise, and shook the table. The structure that ensured stability turned out to be so heavy and bulky that bringing it to a serial prototype made no sense. After celebrating the interim success, a decision was made to replace the engine with a rotating transformer with an air gap. Another reason was the inability to power the engine from the computer's USB port.<\/p>\n

The basis of the LED board was our RM10 module and six LED drivers. MBI5030<\/a><\/noindex>.<\/p>\n

The drivers have 16 channels with the ability to control each one independently. Thus, 6 such drivers and 32 RGB LEDs together can display 16 million colors.<\/p>\n

To synchronize and stabilize the output image, two magnetoresistive Hall effect sensors were used. MRSS23E<\/a><\/noindex>.<\/p>\n

The plan was simple \u2013 the sensor gives an interruption for each rotation of the board, and between two passes, the position of the LEDs is determined, and their azimuth and illumination in a 360-degree sweep are calculated.<\/p>\n

But something went wrong \u2013 regardless of the rotation speed of the board, the sensor randomly output either one or two interruptions per pass. As a result, the image turned out to be blurry and folded in on itself.<\/p>\n

Replacing the sensors did not change the situation, so the Hall sensor was replaced with a photoresistor.<\/p>\n

Anyone with thoughts on why the magnetoresistive sensor might behave this way, please share in the comments.<\/p>\n

\"Hogy
\nThe top side of the board<\/i><\/p>\n

With the optical sensor, the image is clear, but it stabilizes for about 30 seconds. This happens for a number of reasons, one of which is the discreteness of the timer. It is 4 million ticks per second, divided over 360 degrees with a remainder that distorts the output image.<\/p>\n

In Chinese stroboscopic clocks, the image is set in a couple of seconds at the cost of a small segment of the circle simply not being displayed: there is an empty space in the circular image, which is imperceptible in text, but the picture turns out to be incomplete.<\/p>\n

However, the problems did not end there. The microcontroller nRF52832<\/a><\/noindex> nem k\u00e9pes biztos\u00edtani a sz\u00fcks\u00e9ges adat\u00e1tviteli sebess\u00e9get a lehets\u00e9ges \u00e1rnyalatok sz\u00e1m\u00e1hoz (kb. 16 MHz) \u2013 a kijelz\u0151 m\u00e1sodpercenk\u00e9nt 1 k\u00e9pkock\u00e1t ad ki, ami az emberi szemnek el\u00e9g kev\u00e9s. Nyilv\u00e1nval\u00f3, hogy k\u00fcl\u00f6n mikrokontroller elhelyez\u00e9se sz\u00fcks\u00e9ges a k\u00e9pvez\u00e9rl\u00e9shez, addig viszont a MBI5030 helyettes\u00edt\u00e9s\u00e9r\u0151l d\u00f6nt\u00f6ttek MBI5039<\/a><\/noindex>. Ez mind\u00f6ssze 7 sz\u00ednt jelent, bele\u00e9rtve a feh\u00e9ret is, de ez elegend\u0151 a szoftveres r\u00e9sz kidolgoz\u00e1s\u00e1hoz.<\/p>\n

\u00c9s nem elhanyagolhat\u00f3, ami\u00e9rt ezt az oktat\u00e1si feladatot is ki\u00edrt\u00e1k \u2013 a mikrokontroller programoz\u00e1sa \u00e9s a vez\u00e9rl\u00e9s v\u00e9grehajt\u00e1sa egy okostelefonos alkalmaz\u00e1son kereszt\u00fcl.<\/p>\n

Jelenleg a szkennel\u00e9s k\u00f6zvetlen\u00fcl Bluetooth-on kereszt\u00fcl t\u00f6rt\u00e9nik az nRF Connect seg\u00edts\u00e9g\u00e9vel, az alkalmaz\u00e1s interf\u00e9sze pedig fejleszt\u00e9s alatt \u00e1ll.<\/p>\n

\u00cdgy a v\u00e1lt\u00f3csapat munk\u00e1j\u00e1nak k\u00f6zbens\u0151 eredm\u00e9nyei a k\u00f6vetkez\u0151k:<\/p>\n

A forg\u00f3 kijelz\u0151 32 LED-b\u0151l \u00e1ll\u00f3 vonallal rendelkezik \u00e9s az \u00e1bra \u00e1tm\u00e9r\u0151je 150 mm. 7 sz\u00ednt jelen\u00edt meg, a k\u00e9pet vagy sz\u00f6veget 30 m\u00e1sodperc alatt \u00e1ll\u00edtja be (ez nem t\u00f6k\u00e9letes, de kezdetnek elfogadhat\u00f3). Bluetooth-kapcsolaton kereszt\u00fcl lehet parancsot adni a k\u00e9pv\u00e1lt\u00e1sra.<\/p>\n

\"Hogy
\n\u00cdgy n\u00e9z ki<\/i><\/p>\n

Az \u00faj fiatal fejleszt\u0151knek a sikeres tanul\u00e1shoz a k\u00f6vetkez\u0151 feladatokat kell megoldaniuk:<\/p>\n

Legy\u0151zni a mikrokontroller mem\u00f3riahi\u00e1ny\u00e1t a sz\u00ednes paletta teljes megjelen\u00edt\u00e9s\u00e9hez. Meghaladni az alkalmaz\u00e1st a statikus vagy dinamikus k\u00e9p l\u00e9trehoz\u00e1s\u00e1hoz \u00e9s tov\u00e1bb\u00edt\u00e1s\u00e1hoz. Befejezni a szerkezet kialak\u00edt\u00e1s\u00e1t. Tov\u00e1bbra is t\u00e1j\u00e9koztatni fogjuk \u00d6n\u00f6ket.<\/p>\n

P.S. Term\u00e9szetesen, miut\u00e1n befejezz\u00fck a Bluetooth LE-t (nrf52832<\/a><\/noindex>), tervez\u00fcnk \u00e9s megval\u00f3s\u00edtunk egy Wi-Fi\/Bluetooth verzi\u00f3t ESP32-en. De ez m\u00e1r egy \u00faj t\u00f6rt\u00e9net lesz.
\n\"Hogy
\n
Forr\u00e1s: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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