Cov txheej txheem:
- Kauj Ruam 1: Tsim Txoj Cai los tuav lub Sensor
- Kauj Ruam 2: Tsim Lub Rooj Sib Tham Sib Tham
- Kauj ruam 3: Tsim lub PC Interface
- Kauj ruam 4: Xaus
Video: IR Kub Tswj rau SMD Skillet Reflow: 4 Cov Kauj Ruam
2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:31
Cov lus qhia no yuav pab yog tias koj tab tom sim ua koj tus kheej cov laug cam siv SMD (cov cuab yeej saum npoo av) rov ntws. Tom qab txhais tes siv cov laug cam kuv tau txaus siab rau kuv tus kheej. Hauv cov lus qhia no kuv yuav tham feem ntau txog kev siv Melexis MLX90614 IR (infrared tawg) sensor. Tsis tas li, thaum tsim lub rooj sib tham ntsuas lub ntsej muag, kuv tseem yuav saib xyuas kev tsav tsheb Crydom SSR (lub xeev ruaj khov xa tawm). Tam sim no twb tau muaj cov vev xaib cov ntaub ntawv ntawm kev rov ua dua cov laug cam siv lub lauj kaub tais diav lossis lub qhov cub ci. Ob qho ntawm cov txuas hauv qab no zoo: https://www.circuitsathome.com/production/on-reflow-solderinghttps://www.sparkfun.com/commerce/advanced_search_result.php? Keywords = reflow & x = 0 & y = 0 & search_section = tutorialsWhat I xav tias ploj lawm yog cov ntaub ntawv ntawm ntsuas lub lauj kaub. Cov lus qhia no yuav tsum saib xyuas qhov ntawd. Nco tseg, Parallax twb tau ua, thiab muag, Melexis IR interface board. Txawm li cas los xij, Kuv tsis xav tias nws muaj cov txiaj ntsig digital (Kuv tuaj yeem yuam kev txij li kuv tsis tau muaj ib tus). Tsis muaj txoj hauv kev los rub lawv lub sensor nyob ib puag ncig ib qho - lawv cov qauv tsim muaj lub ntsuas hluav taws xob tso rau sab xis rau ntawm lub rooj sib tham.
Kauj Ruam 1: Tsim Txoj Cai los tuav lub Sensor
Tsim kom muaj qhov sib piv yooj yim kom IR sensor tuaj yeem raug tshem tawm saum lub lauj kaub. Kuv rub plaub lub xov hlau hla lub khob thiab tooj liab muab kauv.
Kauj Ruam 2: Tsim Lub Rooj Sib Tham Sib Tham
Qhov me me PIC-12F609 Circuit yog qhov yooj yim heev. Lub interface rau Melexis sensor yog SMBus (Kev Tswj Xyuas Tsheb Npav). Hmoov zoo, Melexis muaj Daim Ntawv Ceeb Toom Zoo ntawm lawv lub vev xaib. Nws tau ua haujlwm me ntsis txhawm rau xa cov cai hla mus rau CCS tus neeg sau. Kuv kuj tseem muaj teeb meem nrog CCS tus lej suav sau cov lej tso tawm. Kuv tau xaus sau kuv tus kheej uas kuv xav tias zoo dua. Kuv cov ntawv siv ib qho ntawm PIC timers. Hauv kev sib piv, CCS tus neeg tsim khoom tsim cov cai RS232 siv tsuas yog software timers. Txawm li cas los xij, txhua qhov chaws tau txuas nrog thiab, kuv xav tias, sau tseg tau zoo. Ntawm no yog qhov txuas mus rau Melexis lub vev xaib rau cov ntawv txheeb thiab cov ntawv sau tseg: https://www.melexis.com/Sensor_ICs_Infrared_and_Optical/Infrared/MLX90614_615.aspxThe Melexis app ceeb toom ntawm SMBus yog qhov tsis tseem ceeb. Tom Cantrell tau sau zoo hauv qhov teeb meem 219 ntawm Circuit Cellar. Thawj tsab xov xwm tuaj yeem yuav hauv lawv lub vev xaib rau $ 1.50. Tom kab lus yog qhov kev tshoov siab uas ua rau kuv txav mus.
Kauj ruam 3: Tsim lub PC Interface
Gui rau txoj haujlwm no yog Python dawb huv. Txhua qhov software (suav nrog Python) yog txhua qhov qhib. Yog tias koj khiav Ubuntu nws yooj yim heev rau nruab. Tsuas yog siv tus tswj hwm pob los teeb tsa Python-2.6, Python-Matplotlib, thiab Python-Serial. Siv tus thawj tswj hwm pob txog ob feeb. Ntawd yog - koj npaj tau los khiav Gui. Kuv tsuas yog Hlub Ubuntu/Linux - Kuv tsis ntseeg nws coj kuv ntau xyoo los hloov. Txhawm rau teeb tsa ntawm Windows koj yuav tsum tau nrhiav txhua daim thiab teeb nws tus kheej. Nws tsis yog qhov nyuaj nrhiav cov pob khoom no vim tias lawv nrov heev. Thaum Python, MatPlotlib, thiab PySerial tau teeb tsa lub PC app txuas yuav tsum ua haujlwm yam tsis muaj teeb meem. Qhov Python Gui app tsav SSR cov zis los ntawm kev xa cov lus txib mus rau PIC. Cov zis tawm mus, thiab tawm, dhau 4 lub hlis thib ob. Raws li qhov piv txwv, kom tau txais 75% cov zis tawm yuav yog 3 vib nas this tawm ntawm 4. Kuv pib sau ib pawg ntawm PID tswj txoj cai. Tab sis, thaum kawg, kuv lub lauj kaub tsis xav tau. Kuv tsuas yog tig lub lauj kaub rau ntawm 100% thiab tos rau qhov kub siab tshaj. Siv kuv lub lauj kaub tais diav txog 8.5 txog 9 feeb los tsoo lub ncov. Txoj cai ntawm qhov siab kuv tig SSR cov zis tawm thiab tom qab ntawd tos 30 vib nas this. Tom qab ntawd, Kuv ncaws ntawm lub rooj me me kiv cua kom pab nce qhov kub thiab txias. Ntawm qhov nqes hav lub lauj kaub tsuas yog ramping li ntawm -0.5 degrees C / thib ob. Tsis pom tias yuav muaj kev phom sij ntawm kev poob siab cua sov vim tias lub qhov hluav taws kub muaj cua sov ntau heev. Oh, kuv yuav luag tsis nco qab, yog tias koj xav hloov ib yam ntawm cov khoom Gui koj tseem yuav xav tau Glade. Nov yog lwm qhov qhib qhov software (sau rau ntawm Linux & Windows). Glade tsuas yog tus hloov kho Gui yooj yim uas tso cai rau koj hloov cov khoom siv hauv Gui.
Kauj ruam 4: Xaus
Zoo, kuv tuaj npaj rau kev ua si loj. Kuv tsim qee rab phom loj los tawm tsam qhov teeb meem qhov cub reflow. Kuv xav tias yuav tsum tau nruj tswj hwm qhov kub hauv kuv lub lauj kaub los ntawm kev siv lub ntsej muag zoo nkauj PID kaw lub voj ntsuas kub. Kuv tau npaj hloov 110Vac rau & tawm sai kom tsav qhov kub hauv qhov cub. Kuv kuj tseem tau npaj los tshuaj xyuas qhov kub thiab txias lub sijhawm ntsuas siv qhov ntsuas hluav taws xob hauv qhov kawg, rau kuv, tsuas yog teeb lub lauj kaub rau ntawm 100% thiab tos kom sov li qhov kub hnyiab ntawm 1/2 degree C ib pliag ua haujlwm tau zoo. Thaum txhua qhov muab tshuaj txhuam yaj rau hauv lub laujkaub yooj yim hloov tawm lub lauj kaub thiab cia nws txias nrog lub kiv cua maj mam. Hauv kuv lub lauj kaub kuv yeej tsis tau los ze rau 2 degree C / thib ob tus nqi nce toj siab tshaj plaws uas cov khoom siv ua khoom siv hais kom zam. Tag nrho txhua qhov, yooj yim zoo nkauj. Oh zoo, tej zaum koj txhua tus yuav xav tau qee rab phom no los pab koj tawm tsam koj tus kheej qhov teeb meem qhov cub rov qab. Nws tseem zoo kom muaj peev xwm saib qhov kub nce hauv lub lauj kaub. Peb vam tias yuav pab tau, Jim
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