Uma irobhothi lakho lasekilasini ligijima ngekhodi yalo ngenkathi lixhunywe kukhompyutha ephathwayo (laptop) nge-USB, kodwa licime noma liqale phansi ngokushesha lapho umfundi ekhipha ikhebula, ubhekene nenkinga yomzila wamandla kagesi (power rail). Imbobo ye-USB inika amandla ingqondo yokubala ye-microcontroller yakho (logic), kanti isekethe yokushayela amamotho (motor driver) ayiwatholi amandla kagesi webhethri yangaphandle adingekayo noma yabelana ngomzila ongalawulwa (unregulated rail) owa masinyane ngenxa yomthwalo wamamotho.

Incazelo Yenkinga Yemizila Emibili Yamandla Kagesi (Dual Power Rail)

Wonke amarobhothi afundisayo anyakazayo—kungakhathaliseki ukuthi akhiwe nge-ESP32, i-Arduino, i-micro:bit breakout, noma i-Raspberry Pi Pico—asebenza ngamasekethe amabili kagesi ahlukene:

• Amandla e-Logic (3.3V noma 5V): Anika amandla i-chip ye-microcontroller, izinzwa eziku-board (sensors), kanye nokusetshenziswa kwekhodi. Lokhu kudla amandla kagesi (current) amancane kakhulu, ngokuvamile aphakathi kuka-50mA no-200mA.
• Amandla eMotho / Actuator (5V kuya ku-12V): Anika amandla amamotho e-DC, ama-servo, noma ama-stepper driver. Amamotho amancane aphuzi e-gear (ama-TT motor) adonsa u-150mA kuya ku-300mA lilinye lapho ezungeza ngokukhululeka, kodwa aphakamela ngaphezu kuka-800mA lilinye lapho eqala ukusebenza noma ebambeka kukhaphethi.

Lapho irobhothi lixhunywe embobeni ye-USB ye-laptop, i-laptop inikeza umzila we-5V ozinzile ofinyelela ku-500mA (noma u-900mA ku-USB 3.0). Lawa ngamandla anele okusebenzisa i-logic ye-microcontroller futhi ngokuvamile anele nje ukuzungezisa amasondo amancane angenamthwalo aphakanyiswe edeskini. Nokho, i-USB ayikwazi ukunika amandla umzimba werobhothi (chassis) ogijima phansi, futhi uma isikhishiwe, umzila we-logic uyehla ube ngu-zero ngaphandle uma kuxhunywe amabhethri asebenzayo azothatha izintambo.

Amaphutha Amathathu Ajwayelekile Okuxhuma Izintambo Ekilasini

Egunjini elijwayelekile lezamarobhothi lesikole elinabafundi abangama-30 noma abangama-40, lokhu kuvamise ukubangelwa ukulungiselelwa okuthile kwehadiwe (hardware configurations) phakathi kokuthathu okulandelayo:

1. I-Motor Shield Inezindawo Zokufaka Amandla Ezihlukene

Ama-board ashayela amamotho (njenge-L298N, i-L293D shield, noma i-motor breakout ezinikele) cishe ngaso sonke isikhathi anamatheminali amabili aqondile (positive terminals) ahlukene: VCC/5V (amandla e-logic) kanye ne-VM/VIN/12V (amandla emotho). Uma abafundi bexhuma ikhebula le-USB, i-regulator ye-5V eku-board inika amandla i-chip, kodwa itheminali yemotho ihlala ingenamandla ngaphandle kokuba ibhethri yangaphandle ixhunywe kumatheminali anezikulufu (screw terminals). Uma selikhishiwe ikhebula, womabili amasekethe aphelelwa ngamandla.

2. I-Power Jumper Ayikho Noma Ayifakwanga Kahle

Ama-board amaningi okushayela anemizila emibili afaka ibhulokhi encane yepulasitiki eyi-jumper (evamise ukubhalwa ukuthi 5V-EN noma VIN-VCC). Lapho le jumper ifakiwe, i-board idlulisa amandla ebhethri nge-linear voltage regulator yangaphakathi ukuze yondle i-logic ye-microcontroller. Uma abafundi bekhipha le jumper, i-microcontroller ithembele ngokuphelele ku-USB ukuthola amandla e-logic, okwenza irobhothi linganyakazi nhlobo ngaso leso sikhathi elinqanyulwa ngaso.

3. Ukwehla Kwe-Voltage (Voltage Sag) kanye Nokuzicisha Kwe-Brownout

Kwesinye isikhathi irobhothi lifakelwe amabhethri (isibonelo, amabhethri amane e-AA ajwayelekile angu-1.5V noma ibhethri le-9V PP3), kodwa i-microcontroller iqala phansi ngokushesha lapho ikhebula likhishwa. Ibhethri elijwayelekile le-alkaline le-9V alikwazi ukuhlinzeka ngamandla kagesi anyukayo (surge current) adingwa amamotho amabili e-DC; i-voltage yehla ngaphansi komkhawulo omncane wokusebenza we-microcontroller (ngokuvamile cishe ku-2.7V kuya ku-3.3V), okuvusa umjikelezo wokuqala phansi we-brownout (brownout reset loop).

Uhlu Olulula Lokuhlola Ukuxhunywa Kwezintambo Lwabalekeleli/Bothisha

Ngaphambi kokuvumela abafundi baxazulule izinkinga zekhodi yabo, hlola ukuxhumana kwamandla kagesi usebenzisa lo mhlahlandlela oyinkomba:

Indlela Yokuxhuma Kahle Imizila Ehlukene ye-Logic Neyamamotho

Ukuqinisekisa ukusebenza okuthembekile ngaphandle kokuboshwa ngentambo, landela lesi sakhiwo esijwayelekile:

1. I-Common Ground: Xhuma itheminali engaphansi (-) yephakethe lakho lebhethri langaphandle ngqo kukho kokubili i-GND ye-Motor Driver kanye ne-GND ye-Microcontroller. Ngaphandle kwe-common ground eyabiwe, izimpawu ze-logic azikwazi ukushintsha ama-transistor e-motor driver ngokuthembekile.
2. Amandla eMotho: Xhuma itheminali eqondile (+) yephakethe lakho lebhethri (6V–9V) ngeswishi ebonakalayo (toggle switch) kuyiphethe itheminali ye-VM noma ye-VIN ye-motor driver.
3. Amandla e-Microcontroller: Uma i-motor shield yakho ifaka i-regulator ye-5V eyakhelwe ngaphakathi, vula i-jumper ye-5V bese uxhuma okukhiphayo okuyi-5V okulawulwayo kwe-shield kokokufaka kwe-5V / VIN kwe-microcontroller. Uma usebenzisa amamojula ahlukene, yehlisa i-voltage yebhethri nge-buck converter ezinikele, noma usebenzise i-development board ye-microcontroller ene-regulator ehlanganisiwe yokufaka ebanzi.

Uma uklama amakhithi ezamarobhothi enzelwe ikilasi lakho noma ufuna ihadiwe yezamarobhothi eyenzelwe kusengaphambili, eyingxenye nengxenye (modular) eqeda ukudideka kwe-brownout kanye nokuhlukana kwemizila yamandla kubafundi, ungabheka izinhlelo zasekilasini ku-Sheen Robotics for Schools.

Isinyathelo Esisheshayo Sokuhlola Esikhungweni Sokufundela (Lab)

Ngaphambi kokuba abafundi benze ukuhlola phansi ngaphandle kwentambo, benze benze lokhu kuhlola kwemizuzwana emibili: phakamisa irobhothi ukuze amasondo azungeze ngokukhululeka, khipha ikhebula le-USB, bese uvula iswishi yebhethri. Uma ama-LED wesimo aku-board ehlala ekhanya ngokugqamile futhi amasondo ezungeza lapho eyalelwa, imizila yamandla e-logic neyamamotho ixhumene futhi ilawulwa ngendlela efanele.