GND: konke odinga ukukwazi mayelana nalawa ma-akhronimi

I-GND

GND, umhlabathi, umhlabathi ... Asho ukuthini ngempela lawo magama? Ingabe angomqondofana noma kukhona umehluko? Konke lokhu kungabaza kuvame lapho ubhekene nomhlaba wezinto zikagesi okokuqala ngqa futhi kufanele usebenzise izingxenye, kodwa banempendulo elula. Kulesi sihloko uzokwazi ukuqonda kahle ukuthi zisho ukuthini, ukuthi ziyini kusekethe, ukubaluleka kwazo, nokuthi ngabe ukhona yini umehluko phakathi kwamagama. Kungani amatheminali kufanele axhunywe kulesi sixhumi ku-a ibhodi ye-arduino, Njll

Umhlabathi = umhlabathi = GND?

Uphawu lwe-GND, umhlabathi

Akukhona nje kuphela ukuthi kunemibandela eminingana yokubhekisela entweni efanayo, kodwa uzobona nezinhlobo eziningana zezimpawu ezilinganayo. Kakhulu I-GND, njengesisekelo, itheminali engathathi hlangothi, njengendawo ephansi, zingabhekisela ezintweni ezihluke kancane, nakuba abantu abaningi bezisebenzisa ngendlela efanayo:

Iyini i-GND noma isisekelo sesekethe ye-elekthronikhi?

I-GND ifushane nge-Ground, kumasekethe e-elekthronikhi nakagesi, ibhekisela endleleni evamile yokubuyisela yamanje emthonjeni kagesi, futhi ngaleyo ndlela ivumele isifunda ukuthi siqedele. Ungayithola kokubili ezinhlelweni zamanje ezishintshayo, nesigaba sawo, ukungathathi hlangothi kanye nomhlabathi, kanye namasekhethi amanje aqondile, lapho kukhona khona izigxobo ezinhle, ezimbi neziphansi.

Kungabuye kubhekwe njengendawo eyireferensi kusekethe ukukala ama-voltages, njengoba kuyiphuzu elingenawo amandla, futhi ukuxhumana okuqondile ngokomzimba emhlabathini. Ngaphezu kwalokho, kungaba indlela yokuphepha, ukuze kuthi uma kuvela uhlobo oluthile lokuvuza kwamanje kumjikelezo, noma ukuphuma komsuka womkhathi (umbani), amandla alimazayo angageleza abheke emhlabeni futhi aphambukiswe ukuze angalimazi umhlaba. imishini.

Yini inqwaba kumshini kagesi?

Kufanele uqaphele, ngoba nakuba ngokuvamile kuthathwa njengegama elifanayo, ubuningi entweni esebenza ngogesi ngokuvamile kuba into ehlukile kulokho okushiwo ngenhla. Futhi kungenxa yokuthi kumadivayisi amaningi anezindlu zensimbi noma isakhiwo, ikhebula livame ukuxhunywa esakhiweni esishiwo, ukuze ekugcineni lixhumeke nasekuxhumekeni komhlaba.

Ngamanye amazwi, i-a indlela ephansi ye-impedance ukuze kuthi lapho kunenkinga yokufakwa kwe-insulation, i-current igeleza kule ndlela futhi isebenze ukuvikela okudingekayo (ama-fuse, ama-thermals, ...), ngaleyo ndlela igweme ukubangela umonakalo kumadivayisi noma ukuthi amadivaysi angakwazi ugesi abasebenzisi lapho bewathinta.

Izinhlobo zaphansi noma i-GND

Kuneziningana izinhlobo I-GND noma ukuxhumana okuphansi uma ukhuluma ngamasekhethi kagesi:

  • Indawo engokoqobo: isho amandla obuso bomhlaba, lapho induku yethusi okuxhunywe kuyo ucingo lomhlaba ishayelwa ukuthwala lawo mandla ombane ayingozi lapho. Umqondo ohlobene nokuphepha kwabantu, ngoba abasebenzisi banamandla afanayo nomhlaba lapho benyathela phansi. Uma amadivaysi enekhono elifanayo, ngeke kube khona ukushintshaniswa okungenzeka, okungukuthi, ngeke kube khona ukukhishwa kukagesi.
  • Isizinda se-analog: Kuyincazelo yakudala yomhlaba, ngesiNgisi Ground nalapho isifinyezo esithi GND sivela khona. Kulokhu, iphoyinti lokubhekisela kumjikelezo we-elekthronikhi ku-0 volts.

Hhayi-ke, mhlawumbe usamile ukudideka okuningi… Kodwa kulula kakhulu. Khumbula ukuthi kumjikelezo we-elekthronikhi, kokubili i-GND noma i-classical ground, kanye nomhlabathi (i-chassis noma i-casing), kufanele futhi ixhunywe phansi. Kodwa-ke, kunezimo ezithile lapho umhlabathi nomhlabathi kungenayo i-voltage efanayo kusekethe, futhi ngisho ne-waveform ingashintshashintsha, njengakuma-Buck converters.

Kuthiwani ngezingxenye ze-elekthronikhi?

Izikhonkwane ze-Ds18b20

Njengoba kungenzeka ukuthi ubonile, izinto eziningi zikagesi zinetheminali eyodwa noma ngaphezulu emakwe ngokuthi I-GND. Lawa matheminali kufanele axhunywe emhlabeni kumjikelezo azobekwa kuwo, ngaphandle kwalokho ngeke asebenze noma angalimala. Kungakho kubalulekile ukufunda imibhalo yolwazi yomkhiqizi ukuze wazi iphinikhodi futhi wenze ukuxhumana okulungile. Isibonelo, endabeni yale nzwa yesithombe, ngokuyisisekelo izikhonkwane ezikhiqizayo zephrojekthi zizoba i-DQ ne-Vdd, okungukuthi, leyo ezohlinzeka ngedatha efundwa inzwa kanye nokunikezwa kwenzwa. Kodwa-ke, kufanele futhi uxhume i-GND, noma kungenjalo ngeke isebenze ...


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  1. Ubhekele imininingwane: Miguel Ángel Gatón
  2. Inhloso yedatha: Lawula Ugaxekile, ukuphathwa kwamazwana.
  3. Ukusemthethweni: Imvume yakho
  4. Ukuxhumana kwemininingwane: Imininingwane ngeke idluliselwe kubantu besithathu ngaphandle kwesibopho esisemthethweni.
  5. Isitoreji sedatha: Idatabase ebanjwe yi-Occentus Networks (EU)
  6. Amalungelo: Nganoma yisiphi isikhathi ungakhawulela, uthole futhi ususe imininingwane yakho.