Ib, Kev Xaiv Kev: sib piv cov ntsiab lus tseem ceeb ntawm kev ntsuas ntsuas
1. Tso saib hom ntais ntawv
Cov zaub nyhuv ntawm segmented LCD yog txiav txim los ntawm LCD hom, tsav tsis, thiab optical hom:
LCD hom: TN hom (twisted nematic hom) muaj tus nqi qis thiab cov lus teb ceev, haum rau cov duab digital yooj yim; STN hom (super twisted nematic hom) muaj qhov sib txawv siab dua thiab txhawb nqa ntau kab zaub; Hom VATN (vertically teem thiab ua raws) muaj lub kaum sab xis saib txog li 160 degree, ua rau nws haum rau cov khoom siv sab nraum zoov. Piv txwv li, ib lub npe ntawm cov twj tso kua mis hluav taws xob tau txais ib qho STN hom ntu code npo, uas tseem tuaj yeem pom meej meej cov dej ntws ceev thiab cov nyiaj seem hauv qab lub teeb muaj zog.
Tsav tsis: ua haujlwm voltage (feem ntau yog 3.0V ~ 3.6V), lub voj voog lub luag haujlwm (1/4 ~ 1/32 Lub Luag Haujlwm), thiab kev tsis ncaj ncees voltage (1/3 ~ 1/5 BIAS) yuav tsum tau sib phim nrog lub ntsiab tswj nti. Piv txwv li, thaum tsav tsheb 4-ntsis ntu code npo nrog STM32F103 microcontroller, 1/4 Duty thiab 1/3 BIAS yuav tsum tau teeb tsa kom tsis txhob muaj dab.
Optical hom: reflective (tsis muaj backlight, nyob ntawm ambient teeb), semi pob tshab thiab semi reflective (txhawb backlight thiab ambient light switching), thiab tag nrho pob tshab (yuav tsum tau backlight) yuav tsum tau xaiv raws li qhov kev siv scenario. Piv txwv li, cov cuab yeej ua liaj ua teb sab nraum zoov siv cov duab pob tshab thiab semi-reflective segment code cov ntxaij vab tshaus, uas cuam tshuam lub hnub ci thaum nruab hnub thiab tig rov qab thaum hmo ntuj.
2. Interface thiab ntim customization
Cov kev txwv spatial ntawm kev ntsuas ntsuas yuav tsum muaj kev sib xyaw ua ke ntawm cov zaub modules
Txoj kev sib txuas: Zebra kab txaij (tsawg- tus nqi, yooj yim sib sau), hlau pins (muaj zog poob siab), COG (Chip On Glass, ultra- ntim nyias) yog cov kev xaiv ntau. Piv txwv li, ib tug handheld spectrum analyzer siv COG ntim thiab ncaj qha khi tus tsav nti mus rau ib tug iav substrate nrog ib tug tuab ntawm tsuas yog 1.2 hli.
Dimensions: Kho cov iav substrate raws li qhov qhib qhov loj ntawm lub ntsuas vaj huam sib luag, nrog qhov tsawg kawg nkaus ntawm 10mm × 10mm. Piv txwv li, ib qho me me hluav taws xob nplai ua tiav kev sib koom ua ke zoo tshaj plaws ntawm thaj chaw tso saib thiab khawm teeb tsa los ntawm kev hloov kho 20mm × 40mm ntu ntu code screen.
Xim thiab Backlight: Monochrome backlights xws li daj ntsuab, xiav, thiab grey tuaj yeem paub qhov txawv ntawm lub xeev (xws li ib txwm / tswb), thaum RGB backlights txhawb ntau- theem ceeb toom. Piv txwv li, lub ntsuas ntsuas kev lag luam siv lub teeb liab liab uas tau hloov pauv thaum lub siab tshaj qhov pib.
2, Interface Design: Los ntawm Cov Kev Xav Tau Ua Haujlwm rau Kev Pom Kev Pom Kev
1. Kev npaj cov ntaub ntawv architecture
Cov zaub interface ntawm kev ntsuas ntsuas yuav tsum ua ntej nthuav tawm cov ntaub ntawv tseem ceeb kom tsis txhob muaj cov ntaub ntawv ntau dhau:
Lub ntsiab zaub cheeb tsam: Tso saib qhov tseem ceeb ntsuas qhov tseem ceeb (xws li voltage, kub, ntws) siv cov font loj (xws li 7-segment digital tube qhov siab siab dua lossis sib npaug li 5 hli). Piv txwv li, lub ntsiab zaub cheeb tsam ntawm ib tug tej yam digital multimeter siv 14 hli siab lej los xyuas kom meej nyeem tau los ntawm 5 meters deb.
Pab pawg tso saib: Cov khoom tso saib, cov cim xwm txheej (xws li qib roj teeb, kev sib txuas lus), lossis cov xub sib txawv. Piv txwv li, ib qho kev soj ntsuam ib puag ncig ib puag ncig qhia "PM2.5 μ g / m ³" units thiab "↑" qauv xub nyob rau hauv qhov chaw pabcuam.
Kev sib tham hauv cheeb tsam: Siv cov cim lossis cov ntawv nyeem kom sai rau cov neeg siv ua haujlwm (xws li "CAL" calibration mode, "HOLD" cov ntaub ntawv khaws cia). Piv txwv li, thaum ib lub laser rangefinder nias lub pob "Measure", lub cheeb tsam cov zaub qhia luv luv qhia qhov "MEASURING".
2. Cov txheej txheem pom kev zoo
Kev sib piv zoo dua: Siv hom kev pom tsis zoo (dub tom qab nrog cov ntawv dawb) lossis ua kom lub kaum sab xis ntawm lub polarizer txhim khu kev pom nyob rau hauv lub teeb muaj zog. Piv txwv li, thaum lub tsheb mounted dej ntsuas kub ntsuas nyob rau hauv lub hnub ci, qhov sib piv tau nce 30% los ntawm kev kho lub kaum sab xis ntawm lub polarizer.
Anti flicker tsim: Siv Grey Code los kho cov ntaub ntawv kab los ntawm kab, txo cov cim ntug flicker. Piv txwv li, qee lub moos hluav taws xob siv Grey code hloov dua siab tshiab los ua kom cov kev hloov digital smoother thaum hloov kho lub sijhawm.
Dynamic display logic: Kho cov duab raug dynamically raws li qhov ntsuas ntau. Piv txwv li, tus pas ntsuas kub qhia qhov tseeb ntawm 0.1℃ntawm -10℃thiab 10 degree, thiab qhov tseeb ntawm 1℃ntawm 10℃thiab 100 degree.
3, Kev txhim kho tsav tsheb: los ntawm kho vajtse txuas mus rau kev siv software
1. Cov txheej txheem txuas kho vajtse
Kev xaiv MCU: Xaiv qhov qis- lub hwj chim, kev sib koom ua ke siab microcontroller (xws li STM32L0 series) nrog rau kev tsim- hauv LCD tsav module uas tuaj yeem txuas ncaj qha mus rau ntu ntu code screen. Piv txwv li, ib lub ntsuas dej ntse siv STM32L051 los tsav 3 tus lej ntu code npo los ntawm SPI interface, nrog lub zog siv tsuas yog 5 μ A.
Kev tswj fais fab: Siv LDO voltage regulator chips (xws li AMS1117-3.3) los muab kev ruaj ntseg voltage, thiab ntxiv filtering capacitors (xws li 10 μ F+0.1 μ F) kom txo hwj chim suab nrov. Piv txwv li, ib qho kev lag luam tachometer txuas nrog rau qhov sib npaug nrog 100 μ F electrolytic capacitor ntawm lub hwj chim input kawg kom cov zaub ruaj khov.
Kev tiv thaiv EMC: Ntxiv cov nplhaib sib nqus ntawm cov kab teeb liab thiab cov kab hluav taws xob, thiab ua raws li lub hauv paus ntsiab lus ntawm "cov kab teeb liab luv, kab dav hauv av" hauv PCB layout. Piv txwv li, ib qho kev saib xyuas kev kho mob tau txhim kho qhov kev tiv thaiv - cuam tshuam muaj peev xwm ntawm ntu ntu code npo los ntawm 20% los ntawm kev ua kom zoo ntawm PCB layout.
2. Kev siv software tsav tsheb
Initialization configuration: Teem cov tsav tsheb tsis (xws li lub voj voog lub luag haujlwm thiab kev tsis ncaj ncees voltage) raws li cov ntaub ntawv phau ntawv. Piv txwv li, tus lej pib rau HT1621 tsav tsheb nti yuav tsum tau teeb tsa nrog BIAS=1/3 thiab DUTY=1/4.
Dynamic refresh algorithm: siv "lub sij hawm- faib multiplexing" thev naus laus zis los hloov kho ntau kab zaub. Piv txwv li, ib qho 4-tus lej ntu code npo ua tiav cov duab dawb flicker los ntawm kev hloov kho COM1 ~ COM4.
Tsawg zog hom: Tua lub teeb rov qab thiab nkag mus rau hom pw tsaug zog thaum tsis ua haujlwm. Piv txwv li, ib qho kev ntsuas hluav taws xob tau txiav tawm lub teeb rov qab tom qab 30 vib nas this ntawm kev tsis ua haujlwm, txo hwj chim ntawm 15mA mus rau 2 μ A.
4, Environmental adaptability optimization: validation ntawm chav kuaj mus rau qhov chaw
1. Kev ntsuas kub dav
Kev xaiv cov khoom siv: Cov khoom siv ua kua siv lead ua dej dav dav (xws li -30℃~ +85}℃) thiab cov yeeb yaj kiab uas tsis tshua muaj kub-resistant polarizing yog siv. Piv txwv li, qee yam khoom siv tshawb fawb Arctic ua kom muaj kev ua haujlwm ib txwm nyob hauv qhov chaw huab cua los ntawm kev hloov kho qhov -40℃~ +85℃ntu ntu code screen.
Kev kuaj kev laus: Ua haujlwm tsis tu ncua rau 1000 teev nyob rau hauv qhov kub thiab txias (85℃/ 85% RH) ib puag ncig los xyuas cov khoom ruaj khov. Piv txwv li, tom qab dhau qhov kev ntsuam xyuas kev laus, qhov sib piv ntawm qhov sib piv ntawm qee lub tsheb dashboard ntu code screen tsuas yog 5%.
2. Kev vibration thiab kev tiv thaiv kev cuam tshuam
Kev txhim kho cov txheej txheem: Sau silicone ua npuas ncauj (xws li PORON 4701-30-2000F) ntawm lub vijtsam thiab lub plhaub, thiab ntxiv cov hlua kho hlau. Piv txwv li, nyob rau hauv lub vibration xeem ntawm lub shield tunneling tshuab dashboard, qhov cuam tshuam tau absorbed los ntawm silicone ua npuas ncauj thiab pom tsis muaj deviation.
Pin ntxiv dag zog: Kub plating kev kho mob yog siv rau hlau pins, thiab kub shrink tubing tiv thaiv yog ntxiv. Piv txwv li, cov pins ntawm ib qho kev ntsuas aviation vaj huam sib luag txoj cai screen raug kho nrog kub plating, uas ua rau lawv cov corrosion kuj nce peb zaug.
5, Kev txheeb xyuas qhov xwm txheej: Tag nrho cov txheej txheem los ntawm kev thov mus rau ntau lawm
Case: Customization ntawm cov zaub interface rau qee hom kev lag luam voltmeter
Kev soj ntsuam xav tau:
Zaub ntau: 0 ~ 1000V, qhov tseeb 0.1V.
Environmental adaptability: -20℃~ +70 degree, vibration theem IEC 60068-2-6.
Kev sib cuam tshuam yuav tsum tau: Txhawb "TSIS" cov ntaub ntawv khaws cia thiab "CAL" calibration hom.
Kev daws:
Kev xaiv: Txais STN hom ntu ntu code npo (saib lub kaum sab xis 120 degree), semi pob tshab thiab semi reflective optical hom, COG ntim (thickness 1.5mm).
Interface tsim:
Lub ntsiab zaub cheeb tsam: 4-tus lej zaub voltage tus nqi (font loj 12mm).
Pab pawg saib xyuas: qhia txog chav tsev "V" thiab cov cim xwm txheej ("Tuav" "CAL").
Kev sib tham tam sim no: Lub npe ua haujlwm luv luv tau tshwm sim thaum lub pob nias.
Kev txhim kho tsav tsheb:
Siv STM32F103C8T6 tsav tsheb, sib txuas lus nrog HT1621 nti los ntawm SPI interface.
Dynamic refresh algorithm: Hloov cov ntaub ntawv tso saib txhua 100ms kom tsis txhob flickering.
Environmental xeem:
Kev ntsuas kub dav: -20℃~ +70℃cyclic test, qhia qhov sib piv attenuation<10%.
Kev vibration test: Tom qab vibration ntawm 10Hz mus rau 500Hz, kev tiv thaiv ntawm tus pin hloov los ntawm tsawg dua 0.1 Ω.
Kev txheeb xyuas qhov cuam tshuam:
Tom qab ntau lawm, cov txiaj ntsig tau mus txog 99.5%, thiab cov neeg siv khoom tawm tswv yim pom pom tseeb thiab kev ua haujlwm zoo.
Ua haujlwm tsis tu ncua rau 6 lub hlis yam tsis muaj kev ua haujlwm tsis zoo ntawm qhov chaw ua haujlwm sab qaum teb ntawm -15 degree.
