Electrow ESP32-32E 3.5 Inch Display Module Phau Ntawv Qhia
Rsource Description
Daim ntawv teev cov peev txheej tau qhia hauv daim duab hauv qab no:
Cov lus qhia Software
Display module software txhim kho cov kauj ruam yog raws li nram no:
A. Tsim ESP32 platform software txhim kho ib puag ncig;
B. yog tias tsim nyog, import cov tsev qiv ntawv software thib peb los ua lub hauv paus rau kev txhim kho;
C. qhib qhov project software kom debugged, koj tuaj yeem tsim qhov project software tshiab;
D. fais fab ntawm cov zaub module, muab tso ua ke thiab rub tawm qhov kev pab cuam debugging, thiab tom qab ntawd xyuas cov software khiav haujlwm;
E. cov nyhuv software tsis ncav cuag qhov xav tau, txuas ntxiv hloov kho qhov program code, thiab tom qab ntawd muab tso ua ke thiab rub tawm, kom txog thaum cov nyhuv ncav cuag qhov xav tau;
Yog xav paub meej txog cov kauj ruam ua ntej, saib cov ntaub ntawv hauv 1-Demo directory.
Cov lus qhia kho vajtse
Tshajview ntawm cov khoom siv kho vajtse module raug tso tawm
Module hardware peev txheej tau qhia hauv ob daim duab hauv qab no:
Cov khoom siv kho vajtse tau piav qhia raws li hauv qab no:
1) LCD npo
Lub LCD zaub loj yog 3.5 nti, tus tsav tsheb IC yog ST7796, thiab qhov kev daws teeb meem yog 320 × 480. ESP32 txuas nrog siv 4-xaim SPI kev sib txuas lus.
A. Taw qhia rau ST7796 maub los
ST7796 maub los txhawb qhov kev daws teeb meem siab tshaj plaws ntawm 320 × 480 thiab muaj GRAM ntawm 345,600 bytes. Nws kuj tseem txhawb nqa 8-ntsis, 9-ntsis, 16-ntsis, 18-ntsis thiab 24-ntsis thaum uas tig mus chaw nres nkoj cov ntaub ntawv tsheb npav, thiab tseem txhawb nqa 3-xaim thiab 4-xaim SPI serial ports. Vim hais tias kev tswj kev sib txuas yuav tsum muaj ntau qhov chaw nres nkoj IO, feem ntau siv yog SPI serial chaw nres nkoj tswj. ST7796 kuj txhawb 65K, 262K, 16.7M RGB xim zaub, cov xim zaub yog nplua nuj heev, thaum txhawb kev sib hloov thiab scrolling zaub thiab video playback, tso saib ntau yam.
Lub ST7796 maub los siv 16 ntsis (RGB565) los tswj lub pixel zaub, yog li nws tuaj yeem tso saib txog 65K xim ib pixel. Qhov chaw nyob pixel yog teem rau hauv kev txiav txim ntawm kab thiab kab, thiab cov kev taw qhia ntawm increment thiab decrement yog txiav txim los ntawm lub scanning hom. ST7796 Display method yog los teeb tsa qhov chaw nyob ua ntej thiab tom qab ntawd teeb tsa tus nqi xim.
B. Taw qhia rau SPI kev sib txuas lus raws tu qauv
Lub sijhawm sau ntawv lub sijhawm ntawm 4-xaim SPI npav yog qhia hauv daim duab hauv qab no:
CSX yog ib tug qhev nti xaiv, thiab lub nti yuav tsuas yog enabled thaum CSX nyob rau hauv qis zog.
D / CX yog cov ntaub ntawv / lus txib tswj tus pin ntawm lub nti. Thaum DCX sau cov lus txib ntawm qib qis, cov ntaub ntawv raug sau rau qib siab
SCL yog lub caij tsheb npav SPI, nrog txhua qhov nce siab xa 1 me ntsis ntawm cov ntaub ntawv;
SDA yog cov ntaub ntawv xa los ntawm SPI, uas xa 8 cov ntaub ntawv ib zaug. Cov ntaub ntawv hom yog qhia hauv daim duab hauv qab no:
Siab me ntsis ua ntej, kis ua ntej.
Rau kev sib txuas lus SPI, cov ntaub ntawv muaj lub sijhawm sib kis, nrog kev sib xyaw ntawm lub sijhawm moos sijhawm (CPHA) thiab moos polarity (CPOL):
Qib ntawm CPOL txiav txim siab lub xeev tsis ua haujlwm ntawm lub sijhawm ua haujlwm synchronous moos, nrog CPOL = 0, qhia txog qib qis. CPOL khub kis tau tus mob raws tu qauv
Kev sib tham tsis muaj kev cuam tshuam ntau;
Qhov siab ntawm CPHA txiav txim siab seb lub serial synchronous moos sau cov ntaub ntawv ntawm thawj lossis thib ob moos dhia ntug,
Thaum CPHL = 0, ua cov ntaub ntawv sau ntawm thawj qhov kev hloov pauv;
Kev sib xyaw ua ke ntawm ob daim ntawv plaub SPI kev sib txuas lus, thiab SPI0 feem ntau siv hauv Suav teb, qhov twg CPHL = 0 thiab CPOL = 0
2) Resistive touch screen
Cov tshuaj tiv thaiv kov yog 3.5 nti loj thiab txuas nrog
XPT2046 tswj IC los ntawm plaub tus pins: XL, XR, YU, YD.
3) ESP32-WROOM-32E module
Cov qauv no muaj ib qho built-in ESP32-DOWD-V3 nti, Xtensa dual-ntxhais 32-ntsis LX6 microprocessor, thiab txhawb cov nqi moos mus txog 240MHz. Nws muaj 448KB ROM, 520KB SRAM, 16KB RTC SRAM, thiab 4MB QSPI Flash. 2.4GHz WIFI, Bluetooth V4.2 thiab Bluetooth Low power modules tau txais kev txhawb nqa. Sab nraud 26 GPIOs, txhawb SD daim npav, UART, SPI, SDIO, I2C, LED PWM, lub cev muaj zog PWM, I2S, IR, mem tes txee, GPIO, capacitive kov sensor, ADC, DAC, TWAI thiab lwm yam khoom siv peripherals.
4) MicroSD card slot
Siv SPI kev sib txuas lus hom thiab ESP32 kev sib txuas, kev txhawb nqa rau MicroSD phaib ntawm ntau lub peev xwm.
5) RGB three-color light
Liab, ntsuab thiab xiav LED teeb tuaj yeem siv los qhia txog kev khiav haujlwm ntawm qhov program.
6) Serial port
Ib qho chaw nres nkoj sab nraud yog siv rau kev sib txuas lus serial chaw nres nkoj.
7) USB rau serial chaw nres nkoj thiab ib-nias download Circuit Court
Cov cuab yeej tseem ceeb yog CH340C, ib kawg yog txuas nrog lub computer USB, ib kawg yog txuas nrog ESP32 serial chaw nres nkoj, thiaj li ua tiav USB rau TTL qhov chaw nres nkoj. Tsis tas li ntawd, ib-nias rub tawm Circuit Court kuj tseem txuas nrog, uas yog, thaum rub tawm qhov program, nws tuaj yeem nkag mus rau hom rub tawm, tsis tas yuav tsum tau kov los ntawm sab nraud.
8) Roj teeb interface
Ob-pin interface, ib qho rau qhov zoo electrode, ib qho rau qhov tsis zoo electrode, nkag mus rau lub roj teeb lub zog thiab them nyiaj.
9) Roj teeb them thiab kev tswj xyuas hluav taws xob
Cov cuab yeej tseem ceeb yog TP4054, qhov Circuit Court no tuaj yeem tswj tau lub roj teeb them tam sim no, lub roj teeb muaj kev nyab xeeb rau lub xeev saturation, tab sis kuj tuaj yeem tswj tau lub roj teeb kom nyab xeeb.
10) BOOT Key
Tom qab cov zaub module yog powered rau, nias yuav txo IO0. Yog hais tias lub sij hawm lub module yog powered rau los yog lub ESP32 yog pib dua, txo IO0 yuav nkag mus rau lub download hom. Lwm cov rooj plaub tuaj yeem siv los ua cov nyees khawm zoo tib yam.
11) Hom-C interface
Lub ntsiab fais fab mov interface thiab program download interface ntawm cov zaub module. Txuas USB rau qhov chaw nres nkoj serial thiab ib-nias rub tawm Circuit Court, tuaj yeem siv rau kev siv hluav taws xob, rub tawm thiab sib txuas lus sib txuas.
12) 5V txog 3.3V Voltage regulator Circuit Court
Cov cuab yeej tseem ceeb yog ME6217C33M5G LDO regulator. Lub voltage regulator circuit txhawb 2V ~ 6.5V dav voltage input, 3.3V ruaj khov voltage tso zis, thiab qhov siab tshaj plaws tso zis tam sim no yog 800mA, uas tuaj yeem ua tau raws li voltage thiab cov cai tam sim no ntawm cov zaub module.
13) RESET Key
Tom qab cov zaub module tau qhib rau, nias yuav rub ESP32 rov pib dua tus pin (lub xeev lub neej ntawd yog rub), thiaj li ua tiav cov haujlwm pib dua.
14) Resistive kov screen tswj Circuit Court
Cov cuab yeej tseem ceeb yog XPT2046, uas sib txuas lus nrog ESP32 los ntawm SPI. Qhov no Circuit Court yog tus choj ntawm lub resistive kov npo thiab ESP32 tus tswv, lub luag hauj lwm rau kev xa cov ntaub ntawv ntawm lub kov screen mus rau lub ESP32 tswv, thiaj li yuav tau txais lub coordinates ntawm kov point.
15) Nthuav tus pin input
Ob qhov tsis siv cov tswv yim IO chaw nres nkoj ntawm ESP32 module tau kos tawm rau kev siv peripheral.
16) Backlight control circuit
Cov cuab yeej tseem ceeb yog BSS138 teb cov nyhuv raj. Ib qho kawg ntawm qhov Circuit Court no txuas nrog lub backlight tswj tus pin ntawm ESP32 tus tswv, thiab lwm qhov kawg yog txuas nrog tus ncej tsis zoo ntawm LCD npo backlight LED lamp. Backlight tswj tus pin rub, rov qab lub teeb, txwv tsis pub tawm.
17) Speaker interface
Cov kab hluav taws xob yuav tsum tau txuas nrog vertically. Siv rau kev nkag mus rau cov hais lus mono thiab nrov nrov.
18) Audio zog amplifier Circuit Court
Cov cuab yeej tseem ceeb yog FM8002E suab amplus IC. Ib kawg ntawm qhov Circuit Court no txuas nrog ESP32 suab DAC tus nqi tso zis tus pin thiab lwm qhov kawg yog txuas nrog lub horn interface. Lub luag haujlwm ntawm lub voj voog no yog tsav lub hwj chim me me los yog tus hais lus kom suab. Rau 5V fais fab mov, lub zog tsav siab tshaj plaws yog 1.5W (load 8 ohms) lossis 2W (load 4 ohms).
19) SPI peripheral interface
4-xaim kab rov tav interface. Coj tawm ib qho tsis siv nti xaiv tus pin thiab SPI interface tus pin siv los ntawm MicroSD daim npav, uas tuaj yeem siv rau cov khoom siv SPI sab nraud lossis cov chaw nres nkoj IO zoo tib yam.
20) I2C peripheral interface
4-xaim kab rov tav interface. Coj tawm ob tus pins tsis siv los ua I2C interface, uas tuaj yeem siv rau sab nraud IIC li lossis cov chaw nres nkoj IO zoo tib yam.
Kev piav qhia ntxaws ntawm schematic daim duab ntawm cov zaub module
1) Hom-C interface Circuit Court
Hauv Circuit Court no, D1 yog Schottky diode, uas yog siv los tiv thaiv qhov tam sim no ntawm kev thim rov qab. D2 rau D4 yog electrostatic surge tiv thaiv diodes los tiv thaiv cov zaub module los ntawm kev puas tsuaj vim ntau dhau vol.tage los yog luv luv Circuit Court. R1 yog lub zog rub-down. USB1 yog hom-C tsheb npav. Cov zaub module txuas rau Type-C fais fab mov, rub tawm cov kev pab cuam, thiab kev sib txuas lus chaw nres nkoj los ntawm USB1. Qhov twg +5V thiab GND yog lub zog zoo voltage thiab av teeb liab USB_D- thiab USB_D + yog qhov sib txawv USB teeb liab, uas tau xa mus rau onboard USB-rau-serial circuit.
2) 5V txog 3.3V Voltage regulator Circuit Court
Nyob rau hauv lub Circuit Court no, C16 ~ C19 yog lub bypass lim capacitor, uas yog siv los tuav lub stability ntawm lub input vol.tage thiab output voltage. U1 yog 5V rau 3.3V LDO nrog tus qauv naj npawb ME6217C33M5G. Vim hais tias feem ntau ntawm cov circuits ntawm cov zaub module xav tau 3.3V fais fab mov, thiab lub hwj chim input ntawm hom-C interface yog yeej 5V, yog li cov vol.tage regulator conversion circuit yuav tsum.
3) Resistive kov screen tswj Circuit Court
Nyob rau hauv lub Circuit Court no, C25 thiab C27 yog bypass lim capacitors, uas yog siv los tswj lub input vol.tage stability. R22 thiab R32 yog rub-up resistors siv los tswj lub neej ntawd tus pin lub xeev siab. U4 yog XPT2046 tswj IC, kev ua haujlwm ntawm IC no yog kom tau txais kev tswj hwm vol.tage tus nqi ntawm qhov kov taw tes ntawm qhov kev tiv thaiv kov npo los ntawm X +, X-, Y +, Y- plaub tus pins, thiab tom qab ntawd los ntawm kev hloov pauv ADC, tus nqi ADC raug xa mus rau ESP32 tus tswv. Tus ESP32 tus tswv tom qab ntawd hloov tus nqi ADC mus rau pixel kev tswj hwm tus nqi ntawm cov zaub. XPT2046 sib txuas lus nrog ESP32 tus tswv ntawm lub tsheb npav SPI, thiab vim tias nws sib koom SPI tsheb npav nrog cov zaub, cov xwm txheej ua haujlwm raug tswj los ntawm CS tus pin. PEN tus pin yog tus kov cuam tshuam tus pin, thiab cov tswv yim qib qis qis thaum muaj qhov tshwm sim kov.
4) USB rau serial chaw nres nkoj thiab ib-nias download Circuit Court
Nyob rau hauv Circuit Court no, U3 yog CH340C USB-rau-serial IC, uas tsis xav tau ib tug sab nraud siv lead ua oscillator los pab tsim Circuit Court. C6 yog ib tug bypass lim capacitor siv los tswj cov input voltage stability. Q1 thiab Q2 yog NPN hom triodes, thiab R6 thiab R7 yog triode puag txwv tam sim no resistors. Lub luag haujlwm ntawm qhov Circuit Court no yog kom paub USB rau qhov chaw nres nkoj thiab ib-nias rub tawm muaj nuj nqi. USB teeb liab yog input thiab tso zis los ntawm UD + thiab UD-pins, thiab xa mus rau tus ESP32 tswv los ntawm RXD thiab TXD pins tom qab hloov dua siab tshiab. One-click download circuit txoj cai:
A. RST thiab DTR pins ntawm CH340C tso zis siab los ntawm lub neej ntawd. Lub sijhawm no, Q1 thiab Q2 triode tsis nyob rau, thiab IO0 pins thiab rov pib dua tus pins ntawm ESP32 lub ntsiab tswj tau rub mus rau qib siab.
B. RST thiab DTR pins ntawm CH340C tso zis qis, lub sijhawm no, Q1 thiab Q2 triode tseem tsis nyob, thiab IO0 pins thiab rov pib dua pins ntawm ESP32 lub ntsiab tswj tseem rub mus rau qib siab.
C. RST tus pin ntawm CH340C tseem tsis hloov pauv, thiab tus pin DTR tso tawm ib theem siab. Lub sijhawm no, Q1 tseem raug txiav tawm, Q2 nyob rau, IO0 tus pin ntawm ESP32 tus tswv tseem rub tawm, thiab tus pin rov pib dua yog rub, thiab ESP32 nkag mus rau hauv lub xeev pib dua.
D. CH340C's RST tus pin outputs theem siab, DTR tus pin outputs ib theem qis, lub sij hawm no Q1 yog nyob rau, Q2 yog tawm, lub reset pin ntawm lub ESP32 lub ntsiab tswj yuav tsis tam sim ntawd siab vim hais tias cov kev cob cog rua capacitor yog them, ESP32 yog. tseem nyob rau hauv lub xeev pib dua, thiab IO0 tus pin yog tam sim ntawd rub down, lub sij hawm no nws yuav nkag mus rau lub download hom.
5) Audio zog amplifier Circuit Court
Nyob rau hauv lub Circuit Court no, R23, C7, C8 thiab C9 tsim lub RC lim Circuit Court, thiab R10 thiab R13 yog qhov nce kho resistors ntawm kev ua haujlwm. amplifier. Thaum tus nqi tsis kam ntawm R13 tsis hloov, qhov me me ntawm qhov tsis kam ntawm R10, qhov loj dua qhov ntim ntawm tus neeg hais lus sab nraud. C10 thiab C11 yog input coupling capacitor. R11 yog lub rub-up resistor. JP1 yog lub horn / speaker chaw nres nkoj. U5 yog FM8002E lub zog suab amplus IC. Tom qab cov tswv yim los ntawm AUDIO_IN, lub suab DAC teeb liab yog amplified los ntawm FM8002E nce thiab tso zis rau tus neeg hais lus / hais lus los ntawm VO1 thiab VO2 tus pins. SHUTDOWN yog tus pab tus pin rau FM8002E. Qib qis yog qhib. Los ntawm lub neej ntawd, qib siab tau qhib.
6) ESP32-WROOM-32E lub ntsiab tswj Circuit Court
Nyob rau hauv no Circuit Court, C4 thiab C5 yog bypass lim capacitors, thiab U2 yog ESP32-WROOM-32E modules. Yog xav paub meej txog lub internal circuit ntawm no module, thov mus saib cov ntaub ntawv official.
7) Qhov tseem ceeb pib dua Circuit Court
Nyob rau hauv no Circuit Court, KEY1 yog tus yuam sij, R4 yog lub rub-up resistor, thiab C3 yog lub ncua capacitor. Rov pib txoj cai:
A. Tom qab fais fab tuag, C3 nqi. Lub sijhawm no, C3 sib npaug rau luv luv, RESET tus pin yog hauv av, ESP32 nkag mus rau hauv lub xeev pib dua.
B. Thaum C3 raug them, C3 sib npaug rau qhib Circuit Court, RESET tus pin raug rub, ESP32 rov pib dua tiav, thiab ESP32 nkag mus rau hauv lub xeev ua haujlwm.
C. Thaum KEY1 raug nias, tus RESET tus pin yog hauv av, ESP32 nkag mus rau lub xeev pib dua, thiab C3 raug tso tawm los ntawm KEY1.
D. Thaum KEY1 tso tawm, C3 raug them. Lub sijhawm no, C3 sib npaug rau luv luv, RESET tus pin yog hauv av, ESP32 tseem nyob rau hauv lub xeev RESET. Tom qab C3 raug them, tus pin rov pib dua yog rub, ESP32 rov pib dua thiab nkag mus rau lub xeev ua haujlwm li qub.
Yog tias qhov RESET ua tsis tiav, tus nqi kam rau ntawm C3 tuaj yeem tsim nyog ntxiv kom ncua sij hawm rov pib dua tus pin qis.
8) Interface Circuit Court ntawm serial module
Nyob rau hauv no Circuit Court, P2 yog 4P 1.25mm suab lub rooj, R29 thiab R30 yog impedance tshuav resistors, thiab Q5 yog ib tug field effect raj tswj lub 5V input fais fab mov. R31 yog ib tug rub-down resistor. Txuas RXD0 thiab TXD0 rau serial pins, thiab muab lub zog rau ob tus pins. Qhov chaw nres nkoj no txuas nrog tib qhov chaw nres nkoj raws li onboard USB-rau-serial chaw nres nkoj module.
9) xpand IO and peripheral interface circuits
Hauv qhov Circuit Court no, P3 thiab P4 yog 4P 1.25mm suab rooj, thiab JP3 yog 2P 1.25mm suab rooj. R33 thiab R34 yog I2C tus pin rub-up resistors. SPI_CLK, SPI_MISO, SPI_MOSI pins tau koom nrog MicroSD daim npav SPI pins. Pins SPI_CS, IIC_SCL, IIC_SDA, IO35, IO39 tsis siv los ntawm cov khoom siv hauv lub nkoj, yog li lawv raug coj tawm mus txuas rau SPI thiab IIC li, thiab tuaj yeem siv rau IO zoo tib yam. Tej yam uas yuav tsum tau saib xyuas:
A. IO35 thiab IO39 tsuas tuaj yeem ua tus pins nkag;
B. Thaum IIC tus pin siv rau IO zoo tib yam, nws yog qhov zoo tshaj kom tshem tawm R33 thiab R34 rub-up tsis kam;
10) Roj teeb them thiab kev tswj xyuas hluav taws xob
Nyob rau hauv no Circuit Court, C20, C21, C22 thiab C23 yog bypass lim capacitor. U6 yog TP4054 roj teeb tswj IC. R27 tswj lub roj teeb them tam sim no. JP2 yog lub rooj zaum 2P 1.25mm, txuas nrog lub roj teeb. Q3 yog P-channel FET. R28 yog Q3 daim phiaj rub-down resistor. TP4054 tsub lub roj teeb los ntawm BAT tus pin, qhov me me ntawm R27 tsis kam, qhov loj dua qhov them tam sim no, qhov siab tshaj plaws yog 500mA. Q3 thiab R28 ua ke tsim lub roj teeb tawm hluav taws xob, thaum tsis muaj hluav taws xob los ntawm Hom-C interface, qhov + 5V voltage yog 0, tom qab ntawd lub rooj vag Q3 tau rub mus rau theem qis, qhov ntws tawm thiab qhov chaw nyob, thiab lub roj teeb muab lub zog rau tag nrho cov zaub module. Thaum powered los ntawm hom-C interface, lub +5V voltage yog 5V, tom qab ntawd lub rooj vag Q3 yog 5V siab, qhov ntws thiab qhov chaw raug txiav tawm, thiab cov khoom siv roj teeb raug cuam tshuam.
11) 48P LCD vaj huam sib luag hlau vuam interface
Nyob rau hauv lub Circuit Court no, C24 yog lub bypass lim capacitor, thiab QD1 yog 48P 0.8mm suab kua siv lead ua tshuaj ntsuam vuam interface. Lub QD1 muaj kev tiv thaiv kov npo teeb liab tus pin, LCD npo voltage tus pin, SPI kev sib txuas lus tus pin, tswj tus pin thiab backlight circuit pin. ESP32 siv cov pins no los tswj lub LCD thiab kov npo.
12) Download key circuit
Hauv Circuit Court no, KEY2 yog tus yuam sij thiab R5 yog tus rub-up resistor. IO0 siab los ntawm lub neej ntawd thiab qis thaum KEY2 nias. Nias thiab tuav KEY2, qhib lossis rov pib dua, thiab ESP32 yuav nkag mus rau hom download. Hauv lwm qhov xwm txheej, KEY2 tuaj yeem siv los ua tus yuam sij ib txwm.
13) Roj teeb hluav taws xob kuaj xyuas Circuit Court
Hauv Circuit Court no, R2 thiab R3 yog ib nrab voltage resistors, thiab C1 thiab C2 yog bypass lim capacitors. Lub roj teeb voltage BAT + teeb liab tawm tswv yim dhau los ntawm qhov sib faib resistor. BAT_ADC yog voltage tus nqi ntawm ob qhov kawg ntawm R3, uas tau xa mus rau ESP32 tus tswv los ntawm tus pin input, thiab tom qab ntawd hloov los ntawm ADC thaum kawg tau txais lub roj teeb vol.tage nqi. Lub voltage divider yog siv vim ESP32 ADC hloov siab tshaj plaws ntawm 3.3V, thaum lub roj teeb saturation vol.tage yog 4.2V, uas yog tawm ntawm qhov ntau. The tau voltage multiplied by 2 yog lub roj teeb tiag tiag voltage.
14) LCD backlight tswj Circuit Court
Nyob rau hauv no Circuit Court, R24 yog qhov debugging tsis kam thiab yog khaws cia ib ntus. Q4 yog N-channel teb cov nyhuv tube, R25 yog Q4 daim phiaj rub-down resistor, thiab R26 yog lub backlight tam sim no limiting resistor. Lub LCD backlight LED lamp yog nyob rau hauv parallel lub xeev, tus ncej zoo txuas nrog 3.3V, thiab tus ncej tsis zoo txuas nrog rau qhov ntws ntawm Q4. Thaum tus tswj tus pin LCD_BL outputs siab voltage, cov dej ntws thiab qhov chaw ncej ntawm Q4 tau hloov mus. Lub sijhawm no, tus ncej tsis zoo ntawm LCD backlight yog grounded, thiab backlight LED lamp yog switched rau thiab emits lub teeb. Thaum tus tswj tus pin LCD_BL outputs tsawg voltage, cov dej ntws thiab qhov chaw ntawm Q4 raug txiav tawm, thiab lub teeb pom kev tsis zoo ntawm lub vijtsam LCD raug tshem tawm, thiab lub teeb rov qab LED lamp tsis hloov rau. Los ntawm lub neej ntawd, lub LCD backlight yog tawm. Txo qhov R26 tsis kam tuaj yeem ua kom qhov siab tshaj plaws ntawm lub teeb rov qab. Tsis tas li ntawd, lub LCD_BL tus pin tuaj yeem nkag PWM teeb liab los kho lub teeb pom kev ntawm LCD.
15) RGB peb-xim lub teeb tswj Circuit Court
Hauv Circuit Court no, LED2 yog RGB peb-xim lamp, thiab R14 ~ R16 yog peb-xim lamp tam sim no limiting resistor. LED2 muaj lub teeb liab, ntsuab thiab xiav LED teeb, uas yog ib qho kev sib txuas anode, IO16, IO17 thiab IO22 yog peb tus pins tswj, uas ua rau lub teeb ci LED nyob rau theem qis thiab tua cov teeb ci LED ntawm qib siab.
16) MicroSD daim npav qhov interface Circuit Court
Hauv Circuit Court no, SD_CARD1 yog MicroSD daim npav qhov. R17 txog R21 yog rub-up resistors rau txhua tus pin. C26 yog lub bypass lim capacitor. Qhov no interface Circuit Court txais SPI kev sib txuas lus hom. Txhawb kev ceev ceev ntawm MicroSD phaib. Nco ntsoov tias qhov kev sib txuas no sib qhia SPI npav nrog SPI peripheral interface.
Kev ceev faj rau kev siv zaub module
- Cov zaub module tau them nrog lub roj teeb, tus neeg hais lus sab nraud plays lub suab, thiab lub vijtsam zaub kuj tseem ua haujlwm, lub sijhawm no tag nrho tam sim no tuaj yeem tshaj 500mA. Hauv qhov no, koj yuav tsum tau them sai sai rau qhov siab tshaj plaws tam sim no txhawb nqa los ntawm Hom-C cable thiab qhov siab tshaj plaws tam sim no txhawb nqa los ntawm lub hwj chim mov interface kom tsis txhob muaj lub zog txaus.
- Thaum siv, tsis txhob kov LDO voltage regulator thiab roj teeb tswj IC nrog koj txhais tes kom tsis txhob raug kub hnyiab.
- Thaum txuas IO chaw nres nkoj, xyuam xim rau kev siv IO kom tsis txhob muaj kev sib txuas tsis raug thiab qhov kev pab cuam code txhais tsis phim.
- Siv cov khoom zoo thiab tsim nyog.
Cov ntaub ntawv / Cov ntaub ntawv
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Electrow ESP32-32E 3.5 Nti Zaub Module [ua pdf] Tus neeg siv phau ntawv E32R35T, E32N35T, ESP32-32E 3.5 nti zaub Module, ESP32-32E, 3.5 nti zaub Module, Zaub Module, Module |