LTE Arduino GPS Tracker + IoT Dashboard (Ntu 1): 6 Cov Kauj Ruam (nrog Duab)

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:27

Taw qhia

Ua li cas txiv neej! Cov Lus Qhia no yog kev taug qab ntawm kuv thawj Phau Ntawv Qhia ntawm kev siv Botletics LTE/NB-IoT daim ntaub thaiv rau Arduino yog li yog tias koj tseem tsis tau muaj, thov nyeem nws kom tau txais kev pom zoo ntawm yuav siv daim ntaub thaiv thiab nws yog dab tsi. Hauv qhov kev qhia no kuv yuav tsom mus rau IoT cov ntaub ntawv nkag mus, thiab tshwj xeeb, GPS thiab ntsuas kub thiab muab koj yuav txhua txoj cai thiab kev taw qhia koj yuav xav tsoo txoj kev thiab sim nws tawm!

Cov Lus Qhia no yog tsom mus rau LTE daim thaiv uas kuv tus kheej tsim thiab tsim, tab sis txhua yam nyob ntawm no (suav nrog Github Arduino lub tsev qiv ntawv) yuav tsum ua haujlwm ntawm SIMCom's 2G thiab 3G modules zoo li SIM800/808/900/5320 ib yam nkaus li nws tsuas yog hloov tshiab version ntawm Adafruit FONA lub tsev qiv ntawv. Txawm hais tias kho vajtse lub tswvyim zoo ib yam nkaus thiab koj tuaj yeem ua ntau yam txias nrog rau qhov no, suav nrog cov ntaub ntawv ntsuas lub log, kev saib xyuas huab cua nyob deb, pib nyiag tsheb karma GPS nrhiav, thiab lwm yam … yog li nyeem!

Kauj Ruam 1: Sau Qhov Chaw

Cov npe yog tib yam li hauv kuv thawj qhov kev qhia thiab yog qhov yooj yim heev!

• Arduino Uno, Mega, lossis Leonardo. Xwb, koj tuaj yeem siv lwm yam 3.3V lossis 5V microcontroller tab sis koj yuav tsum tau xaim tus pin sab nraud.
• Botletics SIM7000 Shield Kit (los nrog daim ntaub thaiv, dual LTE/GPS uFL kav hlau txais xov, thiab teeb tsa poj niam lub taub hau). Xyuas kom koj mus dhau qhov kev qhia no txhawm rau xaiv qhov tsim nyog!
• Hologram SIM daim npav. Thawj daim npav SIM (hu ua "tus tsim" SIM daim npav) yog dawb kiag li thiab los nrog 1MB ntawm cov ntaub ntawv hauv ib hlis! Hauv Asmeskas koj yuav zoo li nyob hauv Verizon network yog tias koj siv Hologram SIM daim npav. Koj tseem tuaj yeem khaws nws ua ke nrog daim npog Botletics yog tias qhov yooj yim dua.
• 3.7V LiPo roj teeb (1000mAH lossis muaj peev xwm ntau dua pom zoo).
• USB cable rau program koj Arduino lossis txhawb nws.

Rau qhov ntsuas GPS taug qab!

• Koj tuaj yeem siv lub tsheb USB hloov kho lub zog rau koj Arduino thaum sim ntsuas qhov thaiv ntawm txoj kev.
• Xwb, koj tuaj yeem siv lub roj teeb pob (7-12V) los txhawb lub Arduino ntawm VIN thiab GND pins.

Kauj Ruam 2: Kev Sib Ntsib Lub Cev

Tam sim no koj muaj tag nrho koj cov khoom, ntawm no yog cov lus piav qhia sai ntawm yam koj yuav tsum tau ua los teeb tsa koj lub kho vajtse:

• Muab cov poj niam sib dhos tso rau ntawm daim thaiv. Saib cov ntawv qhia no yuav ua li cas.
• Txuas daim ntaub thaiv rau hauv Arduino, ua kom ntseeg tau kab txhua tus pin kom koj tsis txhob ua puas rau lawv!
• Ntxig daim npav SIM raws li qhia hauv daim duab. Cov hlau kov lub ntsej muag nqes mus thiab ua qhov cim tseg ntawm qhov chaw ntawm lub thais nyob hauv lub ces kaum.
• Txuas lub roj teeb LiPo rau JST txuas ntawm daim ntaub thaiv
• Txuas koj Arduino rau koj lub computer siv USB cable. Koj yuav pom tias daim ntaub thaiv ntsuab lub zog LED tsis ci. Qhov ntawd zoo ib yam vim tias daim thaiv PWRKEY tus pin yuav tsum tau ua kom qis qis me ntsis thiaj li yuav tig nws. Piv txwv li kos duab Arduino hauv ntu hauv qab no yuav saib xyuas qhov ntawd rau koj!
• Txuas ob lub LTE/GPS kav hlau txais xov rau uFL txuas ntawm sab xis ntawm daim ntaub thaiv. Nco ntsoov tias cov xov hlau yuav hla hla yog li tsis txhob ntsaws qhov tsis raug!
• Koj tau npaj txhij rau software!

Kauj Ruam 3: Teeb Arduino & Kev Xeem Ntaus

Arduino IDE teeb tsa

Yog tias koj tsis tau ua dua, thov saib "Arduino IDE Teeb" thiab "Piv Txwv Arduino" cov kauj ruam hauv cov khoom tseem ceeb Qhia kom paub tseeb tias koj lub rooj tsav xwm ua haujlwm tau zoo. Hauv cov lus qhia no koj yuav tsum rub lub tsev qiv ntawv ntawm Github nplooj ntawv thiab qhib qhov piv txwv piv txwv "LTE_Demo". Tom qab ua raws cov lus qhia no koj yuav tsum tau sim kev sib txuas network, GPS, thiab tshaj tawm cov ntaub ntawv rau dweet.io.

IoT Piv Txwv Sketch

Tam sim no koj tau sim cov yam ntxwv tseem ceeb ntawm koj daim thaiv, ntsaws qhov "IoT_Example" kos duab hauv Arduino IDE. Koj tseem tuaj yeem pom nws ntawm no ntawm Github. Tshaj tawm cov cai no rau koj Arduino thiab qhib lub ntsuas saib thiab koj yuav tsum pom Arduino pom SIM7000 tus qauv, txuas rau lub xov tooj ntawm tes, pab GPS thiab sim ua kom txog thaum nws tau txais kev txhim kho ntawm qhov chaw, thiab tshaj tawm cov ntaub ntawv rau dweet.io. Qhov no yuav tsum ua txhua yam yam tsis hloov kab ntawm txoj cai, piv txwv tias koj siv LTE daim thaiv thiab Hologram SIM daim npav.

Los ntawm lub neej ntawd koj yuav pom cov kab hauv qab no txheeb xyuas tus lej piv txwv (zoo, qhov tseeb yog ncua ntawm cov lus tshaj tawm).

#define samplingRate 30 // Lub sijhawm nyob nruab nrab ntawm cov ntawv, hauv vib nas this

Yog tias kab no tsis tshuav dab tsi, Arduino yuav tshaj tawm cov ntaub ntawv, ncua 30s, tshaj tawm cov ntaub ntawv dua, rov ua dua, thiab lwm yam. yam yooj yim Kuv tsuas yog siv qhov ncua () ua haujlwm kom ncua kev ua haujlwm. Yog tias koj tawm tswv yim kab no Arduino yuav tshaj tawm cov ntaub ntawv tom qab ntawd mus ncaj qha mus rau lub zog qis zog hom mus tas li kom txog thaum koj nias lub pob pib dua ntawm koj Arduino. Qhov no muaj txiaj ntsig yog tias koj tab tom sim qee yam thiab tsis xav hlawv koj cov ntaub ntawv muaj txiaj ntsig dawb (txawm hais tias ua siab ncaj txhua qhov kev tshaj tawm siv yam tsis muaj dab tsi) lossis tej zaum koj muaj sab nrauv sab nrauv los teeb tsa Arduino (555 timer? RTC cuam tshuam? Accelerometer cuam tshuam? Kub ntsuas cuam tshuam? Xav sab nraum lub thawv!). Qhov tseeb hauv Burgalert 7000 qhia kuv qhia koj li cas koj tuaj yeem siv PIR lub suab ntsuas kom tsa lub microcontroller sawv.

Kab tom ntej teeb tsa seb daim thaiv yuav kaw tom qab tshaj tawm cov ntaub ntawv lossis tseem nyob. Koj tuaj yeem xaiv qhov kev xaiv yav dhau los los ntawm kev tsis suav nrog kab ntawv yog tias koj tsuas yog ua piv txwv ib ntus xwb, tab sis yog tias koj muaj qhov piv txwv piv txwv siab koj yuav xav tawm kab hais lus kom cov ntaub thaiv npog nyob ruaj khov thiab tsis muaj rov pib dua, rov qhib GPRS thiab GPS, thiab lwm yam. Thaum cov ntaub thaiv npog sab laug ntawm nws muaj peev xwm tshaj tawm sai sai!

//#txhais turnOffShield // Tua daim ntaub thaiv tom qab tshaj tawm cov ntaub ntawv

Tseem nco ntsoov tias qhov piv txwv no tau txais tus qauv tshwj xeeb thiab thoob ntiaj teb-tshwj xeeb tus lej IMEI ntawm SIM7000 thiab siv nws ua tus lej ntaus ntawv (lossis "npe" yog tias koj xav tau) txhawm rau txheeb xyuas lub cuab yeej thaum nws tshaj tawm cov ntaub ntawv rau dweet.io. Koj tuaj yeem hloov qhov no yog tias koj xav tau, yog li kuv xav tias kuv tsuas yog qhia rau koj paub:)

Txhawm rau txheeb xyuas yog tias koj cov ntaub ntawv raug xa mus rau dweet.io, tsuas yog sau cov ntaub ntawv tsim nyog thiab luam/muab tshuaj txhuam qhov URL rau hauv txhua lub browser:

dweet.io/get/latest/dweet/for/{deviceID}

qhov twg {deviceID} yuav tsum tau hloov pauv nrog tus lej IMEI uas tau luam tawm hauv cov ntawv xov xwm thaum pib, tom qab Arduino pom nws. Tom qab nkag mus rau qhov URL hauv koj tus browser koj yuav tsum pom JSON cov lus teb zoo li hauv qab no:

Saib ntawm "cov ntsiab lus" koj yuav tsum pom latitude, longitude ntawm koj qhov chaw nyob, koj qhov nrawm (hauv kilometers ib teev), kev coj mus (degrees, nrog 0 deg yog North), qhov siab (meters), kub (*C, tab sis xav tias pub dawb los hloov pauv hauv txoj cai), thiab cov khoom siv hluav taws xob hauv milli-Volts (uas yog VBAT, qhov hluav taws xob ntawm lub roj teeb). Yog xav paub ntau ntxiv txog NMEA cov hlua cov ntaub ntawv koj tuaj yeem saib nplooj 149 ntawm SIM7000 AT cov lus txib.

Thaum koj txheeb xyuas tias koj teeb tsa tau ua tiav xa cov ntaub ntawv mus rau dweet, cia teeb tsa lub dashboard los saib tag nrho peb cov ntaub ntawv ntawm tus interface zoo!

Kauj ruam 4: Freeboard.io Teeb

Txog qhov kev qhia no peb yuav siv freeboard.io, qhov txias txias IoT dashboard uas tuaj yeem txuas nrog ntau lub platform huab xws li PubNub thiab dweet, ntxiv rau lwm yam zoo li JSON thiab MQTT. Raws li koj tej zaum tau kwv yees peb tseem yuav siv dweet.io uas tau siv hauv cov piv txwv piv txwv los ntawm ntu dhau los. Raws li qhov kev ceeb toom tseem ceeb, rub cov kab hauv freeboard.io tsis zoo li ua haujlwm hauv Chrome yog li siv Firebox lossis Microsoft Edge hloov chaw. Yog tias koj tsis ua, nws tuaj yeem yog "pane" tiag tiag los npaj cov khoom ntawm koj lub vijtsam!

Account & Ntaus Teeb

• Thawj qhov koj yuav tsum tau ua yog tsim ib tus as khauj los ntawm txhaj rau lub pob "START NOW" liab ntawm lub vev xaib freeboard.io, nkag mus rau daim ntawv pov thawj, thiab nyem "Tsim Kuv Tus Kheej". Tom qab ntawd koj yuav tau txais email ceeb toom lees paub koj tus as khauj tshiab.
• Tam sim no nyem "Nkag mus" nyob rau sab xis saum toj ntawm nplooj ntawv home thiab tom qab kos npe rau hauv koj yuav tsum pom koj "freeboards", uas tsuas yog dashboards uas koj teeb tsa ntawm koj cov phiaj xwm. Pom tseeb yog tias tus as khauj tshiab koj yuav tsis pom dab tsi ntawm no yog li tsuas yog sau lub npe tshiab thiab nyem "Tsim Tshiab" nyob ze rau sab xis. Qhov no yuav coj koj mus rau qhov khoob khoob uas koj tuaj yeem teeb tsa lub interface zoo li koj nyiam nws li cas. Hauv freeboard muaj koj tuaj yeem teeb tsa ntau yam "panes", thiab txhua lub pane tuaj yeem muaj ib lossis ntau yam "widgets" uas yog yam xws li kab kos, duab qhia chaw, ntsuas ntsuas, thiab lwm yam uas tso tawm koj cov ntaub ntawv hauv qee txoj kev.
• Thawj qhov peb yuav tsum tau ua tam sim no yog teeb tsa qhov tseeb ntawm cov ntaub ntawv, uas yog koj li Arduino + LTE daim ntaub thaiv. Txhawm rau ua qhov no, nyem "ADD" nyob rau sab saum toj sab xis hauv qab "Datasources". Tom ntej no, xaiv "Dweet.io" thiab sau ib lub npe uas koj xav tau hauv qab "Npe" teb. Txawm li cas los xij, nco ntsoov tias nyob hauv kab lus "Yam Lub Npe" koj nkag mus rau daim thaiv tus lej IMEI tsis txhob siv lub npe twg los xij, vim tias qhov ntawd freeboard yuav siv rub cov ntaub ntawv los ntawm dweet.
• Tom qab nyem "Txuag" koj yuav tsum pom koj lub cuab yeej tshwm hauv qab "Cov ntaub ntawv" nrog rau zaum kawg nws xa cov ntaub ntawv mus rau dweet. Koj tseem tuaj yeem nyem lub khawm rov ua haujlwm txhawm rau txheeb xyuas qhov tseeb tshiab, tab sis freeboard yuav hloov kho los ntawm nws tus kheej yog li koj ib txwm tsis tas yuav siv lub pob ntawd.

Teeb Dashboard Teeb

Tam sim no cia saib seb yuav teeb tsa lub tswb nrov thiab xuav li cas uas koj xav pom ntawm koj lub vijtsam!

• Txhawm rau ntxiv lub pane, nyem rau "ADD PANE" khawm nyob rau sab laug sab saum toj thiab koj yuav pom nws ntxiv lub qhov rai me me ntawm koj lub vijtsam. Txawm li cas los xij, tseem tsis muaj dab tsi nyob ntawm no vim tias peb tsis tau ntxiv ib qho ntxiv!
• Txhawm rau ntxiv tus widget nyem me ntsis "+" khawm ntawm lub pane. Qhov no yuav coj los rau hauv cov ntawv qhia zaub mov nco nrog ntau yam kev xaiv widget. Txij li thaum peb tab tom yuav ua qee qhov GPS taug qab cia peb xaiv "Google Map" widget. Tom qab ntawd koj yuav tsum pom ob daim teb, latitude thiab longitude. Txhawm rau sau cov no kom raug koj lub cuab yeej yuav tsum tau tshaj tawm rau dweet twb. Piv txwv tias nws muaj, koj yuav tsum tuaj yeem nyem "+ Datasource", nyem rau ntawm cov ntaub ntawv khaws cia ("SIM7000 GPS Tracker"), tom qab ntawv nyem rau "lat", uas yog lub npe sib txawv uas daim ntaub thaiv siv thaum tshaj tawm rau dweet. Rov ua dua cov txheej txheem rau thaj chaw ntev thiab nyem qhov slider hauv qab yog tias koj xav kom daim duab qhia kab kos kab ntawm cov ntaub ntawv taw qhia kom pom tias koj nyob qhov twg.
• Tam sim no koj yuav tsum pom daim ntawv qhia me me ntawm koj thaj chaw kwv yees! Txhawm rau sim yog daim ntawv qhia ua haujlwm, sim hloov koj li GPS tam sim no/ntev mus rau qee yam sib txawv me ntsis los ntawm kev hloov pauv, piv txwv li, thawj tus lej tom qab tus lej ntawm qhov lat/ntev qhov tseem ceeb hauv dweet URL uas tau luam tawm hauv cov ntawv saib hauv Arduino IDE thaum daim ntaub thaiv tshaj tawm cov ntaub ntawv. Tom qab tweaking lawv, theej thiab muab tshuaj txhuam URL thiab ua nws hauv koj tus browser.

dweet.io/dweet/for/112233445566778?lat=11.223344&long=-55.667788&speed=0&head=10&alt=324.8&temp=22.88&batt=3629

Tam sim no hloov rov qab mus rau freeboard thiab koj yuav tsum pom tias nws graphed koj qhov chaw tweaked thiab kos kab kab txiv kab ntxwv ntawm cov ntsiab lus! Cov khoom txias huh? Yog li kuv xav tias koj tau txais daim duab uas peb GPS tracker yuav xa cov ntaub ntawv qhov chaw mus rau dweet rau koj kom pom nws ntawm freeboard hauv lub sijhawm tiag tiag lossis tom qab koj qhov kev lom zem dhau mus

Ntxiv

Txij li thaum peb tus GPS me me tracker xa tsis tsuas yog cov ntaub ntawv lat/ntev tab sis tseem siab tshaj, nrawm, nqe lus, thiab ntsuas kub, cia pov ob peb yam ntxiv kom ua rau peb lub dashboard muaj xim ntau dua!

• Cia peb pib los ntawm kev ntxiv lub pane tshiab tom qab ntawd ntxiv cov ntsuas hauv lub pane tshiab nyem rau "+" khawm hauv lub pane thiab xaiv "Gauge". Ib yam li ua ntej, siv cov ntaub ntawv cov ntaub ntawv thiab xaiv "nrawm" raws li cov ntaub ntawv peb xav tau hauv kev nqa mus rau qhov ntsuas no. Koj yuav tsum pom qhov ntsuas zoo ntawm koj lub dashboard!
• Rov ua qhov no rau qhov siab thiab qhov ntsuas kub.
• Tam sim no rau nqe lus hais ntxiv peb "Pointer" hloov chaw. Qhov no yog qhov ntsuas tseem ceeb vim tias nws pib tawm taw tes (Sab Qaum Teb) ntawm 0 degrees thiab tig mus raws lub moos raws rau cov lus pom zoo.. Perfecto!
• Txhawm rau hloov qhov luaj li cas ntawm lub pane, yuj hla lub pane uas muaj daim duab qhia chaw thiab koj yuav tsum pom lub cim me me ntawm lub kaum sab xis saum toj. Nyem qhov ntawd thiab nkag mus rau lub npe rau lub pane thiab nkag mus "2" hauv qab "Kab" kom nce qhov dav ntawm lub pane.
• Txhawm rau hloov qhov chaw ntawm lub panes tsuas yog rub lawv ncig! Koj tseem tuaj yeem sim ntxiv "Sparkline" uas yog ib qho tsuas yog kab kab kom koj tuaj yeem pom tsis yog cov ntaub ntawv tshiab kawg tab sis cov ntaub ntawv keeb kwm thiab.

Muaj kev lom zem thiab teeb tsa txhua yam uas koj nyiam vim tias peb tau npaj tawm mus ncig ua si!

Kauj ruam 5: Xeem

Txhawm rau sim koj teeb kuv xav kom teeb tsa lub sijhawm piv txwv rau tus nqi qis, zoo li 10-20s kom koj tuaj yeem ntes koj cov lus nrog kev daws teeb meem siab dua. Kuv tseem yuav tawm ntawm "turnOffShield" qhov sib txawv tau tawm tswv yim kom daim ntaub thaiv tsis mus pw. Qhov no tso cai rau nws tshaj tawm cov ntaub ntawv hauv kev ua tiav nrawm.

Tom qab xa cov cai rau koj Arduino, txawm tias tau txais lub roj teeb pob (7-12V) los ua kom lub zog Arduino lossis tsuas yog ntsaws Arduino siv lub tsheb USB adapter. Koj tseem yuav xav tau 3.7V LiPo roj teeb ntsaws rau hauv daim ntaub thaiv raws li tau hais ua ntej; daim ntaub thaiv uas pom hauv daim duab saum toj no yog qhov qub thiab tsis muaj LiPo roj teeb txhawb tab sis tam sim no xav tau ntawm txhua qhov hloov tshiab.

Tom ntej no, qhib lub freeboard qhov chaw yog li thaum koj rov qab koj tuaj yeem pom cov txiaj ntsig! Thaum koj ntsaws rau hauv Arduino koj zoo mus! Pib tsav tsheb ib puag ncig, tau txais kas fes, rov qab los tsev, thiab koj yuav tsum pom cov ntaub ntawv tau npaj tseg ntawm lub freeboard. Yog tias koj xav tau tiag tiag (Kuv tsis pom zoo qhov no thaum tsav tsheb…) koj tuaj yeem saib cov ntaub ntawv freeboard ntawm koj lub xov tooj raws sijhawm raws li koj tus phooj ywg tsav tsheb. Cov khoom lom zem!

Kauj Ruam 6: Cov txiaj ntsig

Txog qhov kev sim no kuv txiv thiab kuv tau mus nqa qee tus nruas qaib ntawm Trader Joe's (omnomnomnom…) thiab peb tau khaws qee cov ntaub ntawv raug zoo. Kuv tau ntaus ntawv xa cov ntaub ntawv txhua 10s thiab qhov nrawm tshaj plaws los ntawm kev mus ncig yog txog 92khm (ncig 57mph) uas yog qhov raug heev vim tias peb khaws lub qhov muag ntawm lub ntsuas hluav taws xob tas li. LTE daim ntaub thaiv yeej ua nws txoj haujlwm tau zoo heev thiab xa cov ntaub ntawv mus rau huab sai heev. Tam sim no zoo heev!

Txawm li cas los xij, tej zaum cov xov xwm tsis zoo yog tias daim duab qhia chaw ntawm lub freeboard tsis zoo li kuv tau xav thaum xub thawj. Nws tsis tso cai rau koj txav chaw ntawm koj tus nas thiab nws nyob nruab nrab ntawm qhov chaw kawg yog li nws zoo heev rau yam xws li tsheb GPS tracker tab sis tsis yog tias koj xav tshuaj xyuas qhov kev mus ncig ua tiav nrog txhua cov ntaub ntawv ntsiab lus, tshwj xeeb tshaj yog tias nws yog txoj kev mus ntev.

Hauv qhov kev qhia no peb tau kawm paub siv LTE ntaub thaiv npog li GPS tracker thiab cov ntaub ntawv logger thiab yuav ua li cas saib cov ntaub ntawv ntawm freeboard.io sai. Tam sim no siv koj lub tswv yim thiab siv nws hauv koj tus kheej txoj haujlwm. Koj tseem tuaj yeem ntxiv cov ntaub thaiv npog ntau dua thiab tig qhov no mus rau hauv lub zog hluav taws xob hnub ci cov ntaub ntawv logger tsawg! (Kuv yeej yuav tau npaj rau kev qhia ua qhov ntawd yav tom ntej!). Vim tias cov kev txwv ntawm daim ntawv qhia dawb kuv tseem tab tom npaj ua qhov kev qhia tshiab yuav ua li cas los ua koj tus kheej hauv app uas nqa cov ntaub ntawv los ntawm dweet thiab yuav tso cai rau koj teeb duab qhov chaw ntawm tus tracker hauv Google Maps nrog pib, ncua, thiab nres cov yam ntxwv rau koj qhov kev mus! Nyob twj ywm!

• Yog tias koj nyiam txoj haujlwm no, thov muab nws lub siab!
• Yog tias koj muaj lus nug, lus pom, tswv yim ntawm kev qhia tshiab, lossis sim ua qhov haujlwm no koj tus kheej, twv yuav raug hu tawm hauv qab no!
• Ua raws li kuv ntawm no ntawm Cov Lus Qhia, sau npe rau kuv YouTube channel, lossis ua raws kuv hauv Twitter kom hloov kho tshiab nrog kuv cov phiaj xwm Arduino kawg! Kuv yog tus kws tsim txuj ci hluas nrog kev mob siab rau sib qhia qhov kuv tau kawm, yog li yuav muaj qee qhov kev qhia ntxiv sai sai no!
• Yog tias koj xav txhawb qhov kuv ua hauv kev sib qhia qhib cov khoom siv khoos phis tawj thiab sau lawv kom huv rau lub hom phiaj kev kawm, txiav txim siab yuav koj tus kheej daim ntaub thaiv ntawm Amazon.com los ua si nrog!