Cov txheej txheem:

Tsim kom muaj Lub Hwjchim Loj PDB (Pawg Faib Lub Hwjchim) rau Pixhawk: 5 Kauj Ruam
Tsim kom muaj Lub Hwjchim Loj PDB (Pawg Faib Lub Hwjchim) rau Pixhawk: 5 Kauj Ruam

Video: Tsim kom muaj Lub Hwjchim Loj PDB (Pawg Faib Lub Hwjchim) rau Pixhawk: 5 Kauj Ruam

Video: Tsim kom muaj Lub Hwjchim Loj PDB (Pawg Faib Lub Hwjchim) rau Pixhawk: 5 Kauj Ruam
Video: Vajtswv Tso Dej Nyab Los Rhuav Tshem Lub Ntiaj Teb (Cov Ntsiab Lus Tseem Ceeb) 2024, Kaum ib hlis
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Tsim ntawm Lub Hwjchim Loj PDB (Lub Rooj Sib Tham Fais Fab) rau Pixhawk
Tsim ntawm Lub Hwjchim Loj PDB (Lub Rooj Sib Tham Fais Fab) rau Pixhawk

PCB los txhawb lawv txhua tus!

Tam sim no feem ntau ntawm cov ntaub ntawv uas koj xav tau los tsim lub drone yog pheej yig muaj nyob hauv is taws nem yog li lub tswv yim ntawm kev tsim tus kheej tsim PCB tsis tsim nyog nws tshwj tsis yog qee qhov xwm txheej uas koj xav ua qhov txawv thiab muaj zog drone. Hauv qhov xwm txheej ntawd koj yuav tsum muaj peev xwm zoo dua lossis muaj Kev Qhia Qhia rau nws …;)

Kauj Ruam 1: Lub Hom Phiaj

Lub hom phiaj ntawm PCB no (thiab yog vim li cas nws thiaj nrhiav tsis tau hauv internet) yog:

1.- Nws yuav tsum ua kom lub zog Pixhawk 4 nrog qhov ntsuas tam sim no, ntsuas qhov hluav taws xob thiab txuas tib yam.

2.- Nws yuav tsum muaj I/O thiab FMU cov txuas txuas ncaj qha rau tus pin, CAP & ADC tsis xav tau hauv kuv rooj plaub.

3.- Nws yuav tsum muaj peev xwm ua kom muaj zog 5 lub cav nrog ua ke ntau tshaj tam sim no ntawm 200A, Yep, 0, 2 KiloAmperes!

Nco tseg: Nws tseem muaj txiaj ntsig zoo rau kev tsim qauv uas tsis muaj lub cav lossis tsis tshua muaj tam sim no. Qhov no tsuas yog kuv rooj plaub.

Kauj ruam 2: Schematics thiab xaiv Cheebtsam

Schematics thiab xaiv Cheebtsam
Schematics thiab xaiv Cheebtsam

OK, tam sim no peb paub tias peb xav ua dab tsi. Txhawm rau mus txuas ntxiv peb yuav tsim cov duab.

Yog tias koj tsis xav nkag siab txog cov khoom siv hluav taws xob tom qab lub rooj tsav xwm no tsuas yog luam cov lej thiab mus rau qib tom ntej.

Cov lej tuaj yeem faib ua ob ntu tseem ceeb, DCDC txhawm rau lub zog pixhawk thiab faib lub zog ntawm lub cav.

Nrog DCDC txoj hauv kev yooj yim tshaj plaws yog siv Traco Power DCDC thiab zam kom tsis txhob tsim nws tab sis vim kuv tsis nyiam txoj kev yooj yim Kuv yuav siv LM5576MH los ntawm Texas Instruments. Qhov kev sib koom ua ke no yog DCDC uas tuaj yeem tswj cov zis tau txog 3A thiab nws cov ntawv qhia koj txhua yam ntaub ntawv hais txog kev sib txuas thiab cov khoom siv xav tau thiab nws muab cov qauv kom tau txais qhov xav tau tshwj xeeb ntawm DCDC hloov kho cov khoom siv.

Nrog qhov kev tsim ntawm DCDC rau Pixhawk, hauv kuv qhov xwm txheej, xaus zoo li pom hauv daim duab.

Ntawm lwm sab qhov kev faib hluav taws xob suav nrog kev nkag siab ntawm qhov tam sim no thiab qhov hluav taws xob thiab kev faib tawm nws tus kheej uas yuav txiav txim siab hauv qib tom ntej.

Qhov ntsuas hluav taws xob yuav yooj yim yog qhov faib hluav taws xob uas ntawm nws qhov siab tshaj plaws ntawm 60 V (qhov siab tshaj qhov kev txhawb nqa los ntawm DCDC) nws muab tawm 3.3V teeb liab.

Kev nkag siab tam sim no nyuaj me ntsis txawm tias peb tseem yuav siv Ohm txoj cai. Txhawm rau nkag siab qhov tam sim no peb yuav siv shunt resistors. Txhawm rau kom muaj txiaj ntsig ntau tshaj plaws tam sim no lawv tuaj yeem siv tau, 10W cov neeg tawm tsam yuav siv. Nrog lub zog ntawd, qhov tsawg tshaj plaws SMD shunt resistors Kuv tuaj yeem pom qhov twg ntawm 0.5mohm.

Ua ke cov ntaub ntawv dhau los thiab cov qauv mis, W = I² × R, qhov siab tshaj plaws tam sim no yog 141A, uas tsis txaus. Tias yog vim li cas ob lub shunt resistors nyob rau hauv parallel yuav siv kom qhov sib npaug tsis kam yog 0.25 mohm thiab tom qab ntawd qhov siab tshaj tam sim no xav tau 200A. Cov neeg tawm tsam no yuav txuas nrog INA169 kuj los ntawm Texas cov cuab yeej thiab, zoo li hauv DCDC, nws tsim qauv yuav ua raws li cov ntawv teev tseg.

Thaum kawg cov khoom sib txuas siv los ntawm GHS series los ntawm JST cov txuas thiab tus pinout los ntawm pixhawk 4 tau ua raws kom ua qhov txuas zoo.

Nco tseg: Kuv tsis muaj INA169 tivthaiv hauv Altium yog li tsuas yog siv lub ntsuas hluav taws xob nrog tib lub hneev taw.

Nco tseg 2: Daim ntawv ceeb toom tias qee yam khoom tau muab tso rau tab sis tus nqi hais tias TSIS YOG, uas txhais tau tias lawv yuav tsis siv tshwj tsis yog qee yam hauv kev tsim ua haujlwm tsis raug.

Kauj Ruam 3: Tsim PCB nrog Altium Designer

Tsim ntawm PCB Nrog Altium Designer
Tsim ntawm PCB Nrog Altium Designer
Tsim ntawm PCB Nrog Altium Designer
Tsim ntawm PCB Nrog Altium Designer
Tsim ntawm PCB Nrog Altium Designer
Tsim ntawm PCB Nrog Altium Designer

Hauv cov kauj ruam no txoj kev hla ntawm pcb yuav ua tiav.

Thawj yam uas yuav tsum tau ua yog tso cov khoom sib txuas thiab txheeb xyuas lub rooj tsav xwm zoo. Hauv qhov no yuav ua ob qhov chaw sib txawv, DCDC thiab cov txuas, thiab thaj chaw fais fab.

Hauv cheeb tsam fais fab, cov ntaub qhwv tawm ntawm lub rooj tsav khoom kom qee lub raj cua sov tuaj yeem siv tau tom qab siv tas thiab qhov txuas txuas tseem tiv thaiv zoo.

Thaum qhov ntawd ua tiav, tom ntej yog kev hloov pauv ntawm cov khoom siv, ua kom ob txheej txheej tau siv tau zoo thiab cov cim loj dua tau siv hauv kev sib txuas hluav taws xob. Thiab nco ntsoov, tsis muaj cov ces kaum raug hauv kab zauv!

Thaum txoj kev ua tiav tau ua tiav thiab tsis yog ua ntej, cov duab sib dhos tau siv, ntawm no yuav muaj GND cov duab sib dhos rau hauv qab txheej thiab lwm qhov nyob rau txheej sab saum toj tab sis tsuas yog npog DCDC thiab thaj chaw sib txuas. Lub zog fais fab ntawm txheej txheej saum toj kawg nkaus yuav siv rau qhov ntsuas hluav taws xob raws li qhia hauv daim duab thib peb.

Thaum kawg, pawg thawj coj no tsis tuaj yeem ua haujlwm 200A nws tau tsim rau, yog li qee thaj tsam ntawm lub ntsej muag yuav raug nthuav tawm yam tsis muaj silkscreen, raws li pom hauv ob daim duab kawg, yog li qee qhov tsis pom cov hlau raug muag nyob ntawd thiab tom qab ntawd cov nyiaj tam sim no tuaj yeem ua tau mus dhau lub rooj tsavxwm ntau tshaj li txaus kom ua tiav peb cov kev xav tau.

Kauj Ruam 4: Tsim Gerber Cov Ntaub Ntawv rau JLCPCB

Thaum qhov kev tsim tiav lawm nws yuav tsum dhau los ua qhov tseeb. Txhawm rau ua qhov chaw tsim khoom zoo tshaj plaws uas kuv tau ua haujlwm nrog yog JLCPCB, lawv txheeb xyuas koj lub rooj tsavxwm txawm tias ua ntej koj them rau nws yog li ntawd yog tias lawv pom ib qho yuam kev nrog nws koj tuaj yeem kho nws yam tsis poob nyiaj, thiab ntseeg kuv, qhov no yog qhov muaj sia tiag.

Txij li lub rooj tsavxwm no yog ob lub rooj tsav xwm txheej thiab tsawg dua 10x10 cm, 10 units tus nqi tsuas yog 2 $ + kev thauj khoom, pom tseeb qhov kev xaiv zoo dua li ua koj tus kheej vim tias tus nqi qis koj tau txais qhov zoo tshaj plaws.

Txhawm rau xa tus qauv rau lawv nws yuav tsum raug xa tawm mus rau cov ntaub ntawv gerber, lawv muaj kev qhia rau Altium, Dav dawb hau, Kikad thiab Diptrace.

Thaum kawg cov ntaub ntawv no tsuas yog yuav tsum tau muab xa mus rau lawv lub vev xaib tsocai.

Kauj ruam 5: Xaus

Thiab qhov ntawd yog nws!

Thaum PCB tuaj txog qhov txias txias, muab tshuaj txhuam thiab ntsuas. Thiab tau kawg! Kuv yuav upload ntau cov duab!

Nyob rau lub lim tiam tom ntej no kuv yuav tau muab kuv cov ntawv pov thawj pov tseg thiab sim nws, yog li yog tias koj xav ua txoj haujlwm no tos kom txog thaum ob qho xwm txheej tom ntej cim OK. Nrog rau qhov no kuv yuav zam koj txoj haujlwm botched lossis hloov pauv

Solder: TSIS YOG

Test: TSIS YOG

Daim ntawv ceeb toom tias qhov no yog SMD soldering, yog tias nws yog koj thawj zaug soldering lossis tsis muaj cov hlau zoo siv los txiav txim siab ua lwm txoj haujlwm vim nws tuaj yeem yog qhov teeb meem.

Yog leej twg muaj kev ua xyem xyav txog tus txheej txheem tsis txhob ua siab deb hu rau kuv.

Tsis tas li yog tias koj ua nws, thov, Kuv yuav nyiam paub thiab pom nws!

Pom zoo: