Chithunzi cha LCD E32R28T 2.8inch ESP32-32E

Chogulitsachi ndi gawo lowonetsera la 2.8-inch ESP32-32E E32R28T&E32N28T yokhala ndi zida zosiyanasiyana zamapulogalamu ndi mapulogalamu opangira chitukuko.

Malangizo Ogwiritsira Ntchito Zogulitsa

Buku lothandizira lili ndi sample mapulogalamu, malaibulale a mapulogalamu, mawonekedwe azinthu, zojambula, ma sheets, schematics, zolemba za ogwiritsa ntchito, ndi pulogalamu yazida.
Chigawo ichi chimapereka chowonjezeraview za zida za hardware zomwe zilipo pa module.

Imafotokozera mwatsatanetsatane chojambula cha module yowonetsera.
Amapereka kusamala koyenera kuchitidwa mukamagwiritsa ntchito gawo lowonetsera.

Kufotokozera Kwazinthu

Buku lothandizira likuwonetsedwa mu chithunzi chotsatirachi:

Directory	Kufotokozera Kwazinthu
1-Chiwonetsero	Aample pulogalamu code, lachitatu chipani mapulogalamu laibulale kuti sample pulogalamu amadalira, lachitatu chipani mapulogalamu laibulale m'malo file, chikalata cha malangizo a kukhazikitsa mapulogalamu a mapulogalamu, ndi sampmaphunziro a pulogalamu chikalata.
2-Kufotokozera	Onetsani mawonekedwe amtundu wazinthu, mawonekedwe a LCD skrini ndi LCD yowonetsa driver IC code yoyambira.
3-Structure_Diagram	Onetsani kukula kwa zinthu za module ndi zojambula za 3D
4-Tsamba lazambiri	LCD chiwonetsero cha driver ILI9341 data book, resistance touch screen driver XPT2046 data book, ESP32 master data book and hardware design guide document, USB to Serial IC(CH340C) data book, audio ampLifier Chip FM8002E buku la data, 5V mpaka 3.3V data book regulator ndi kasamalidwe ka batire la Chip TP4054 data sheet.
5-Zosangalatsa	Zopangira zida zamagetsi, ESP32-WROOM-32E gawo la IO gwero la magawo, schematic, ndi phukusi la PCB
6-User_Manual	Zolemba za ogwiritsa ntchito
7-Tool_software	WIFI ndi Bluetooth kuyesa APP ndi zida zowonongeka, USB kupita ku doko loyendetsa galimoto, pulogalamu ya ESP32 Flash download chida, mapulogalamu otengera khalidwe, mapulogalamu ojambula zithunzi, mapulogalamu a JPG ndi serial port debugging zida.
8-Mwachangu_Yambani	Muyenera kuwotcha bin file, tsegulani chida chotsitsa, ndikugwiritsa ntchito malangizowo.

Malangizo a Mapulogalamu

Njira zowonetsera ma module a pulogalamuyo ndi izi:

A. Pangani malo opangira mapulogalamu a ESP32.

B. Ngati kuli kofunikira, lowetsani malaibulale a mapulogalamu a chipani chachitatu ngati maziko a chitukuko;
C. Tsegulani pulojekiti yamapulogalamu kuti iwonongeke, kapena mutha kupanganso pulogalamu yatsopano yamapulogalamu.

D. mphamvu pa gawo lowonetsera, phatikizani ndi kukopera pulogalamu yowonongeka, ndiyeno fufuzani momwe mapulogalamu akuyendera.
E. Zotsatira za pulogalamuyo sizifika pazomwe zikuyembekezeredwa, pitilizani kusintha kachidindo ka pulogalamuyo, kenako phatikizani ndikutsitsa, mpaka zotsatira zake zifike zomwe zikuyembekezeredwa.
Kuti mumve zambiri zazomwe zapitazi, onani zolembedwa mu 1 Demo directory.

Malangizo a Hardware

Zathaview Zomwe zili mu module ya hardware zikuwonetsedwa

Zida za hardware za module zikuwonetsedwa muzithunzi ziwiri zotsatirazi:

Zida za hardware zikufotokozedwa motere:

LCD

Kukula kwa LCD ndi 2.8 mainchesi, dalaivala IC ndi ILI9341, ndipo chisankho ndi 24 0x 32 0. ESP32 imagwirizanitsidwa pogwiritsa ntchito mawonekedwe a 4-waya a SPI.
A. Chiyambi cha ILI9341 wolamulira Woyang'anira ILI9341 amathandizira kuthetsa kwakukulu kwa 240 * 320 ndi 172800-byte GRAM. Imathandiziranso ma 8-bit, 9-bit, 16-bit, ndi 18-bit mabasi a data ofanana. Imathandiziranso ma 3-waya ndi ma 4-waya a SPI siriyo madoko. Popeza kuwongolera kofananira kumafuna madoko ambiri a I/O, chofala kwambiri ndi SPI serial port control. ILI9341 imathandizanso 65K, 262K RGB mawonetsedwe amtundu, mtundu wowonetsera ndi wolemera kwambiri, pamene akuthandizira mawonedwe ozungulira ndi mpukutu wowonetsera ndi kusewera mavidiyo, ndikuwonetsera m'njira zosiyanasiyana.

Woyang'anira ILI9341 amagwiritsa ntchito 16bit (RGB565) kuwongolera mawonekedwe a pixel, kotero amatha kuwonetsa mpaka mitundu ya 65K pa pixel. Kuyika adilesi ya pixel kumachitika motsatira mizere ndi mizere, ndipo njira yowonjezereka ndi yocheperako imatsimikiziridwa ndi njira yojambulira. Njira yowonetsera ILI9341 imachitika pokhazikitsa adilesi ndikuyika mtengo wamtundu.
B. Chiyambi cha SPI communication protocol

Nthawi yolembera ya basi ya 4-waya SPI ikuwonetsedwa pachithunzi chotsatira:

CSX ndi kusankha tchipisi cha akapolo, ndipo chip chidzayatsidwa kokha pamene CSX ili pamlingo wochepa mphamvu.
D/CX ndiye pini yowongolera deta / lamulo la chip. Pamene DCX ikulemba malamulo otsika, deta imalembedwa pamtunda wapamwamba

SCL ndi wotchi ya basi ya SPI, yomwe ili ndi malire okwera ndikutumiza 1 pang'ono ya data.
SDA ndi data yofalitsidwa ndi SPI, yomwe imatumiza ma data 8 nthawi imodzi. Mawonekedwe a data akuwonetsedwa pachithunzi chotsatira:

Pang'ono pang'ono, perekani poyamba.
Pakulankhulana kwa SPI, data ili ndi nthawi yotumizira, kuphatikiza gawo la wotchi yeniyeni (CPHA) ndi polarity wa wotchi (CPOL):
Mulingo wa CPOL umatsimikizira kuchuluka kwa wotchi yolumikizana, yokhala ndi CPOL=0, kuwonetsa kutsika. CPOL pair transmission protocol
Kukambitsiranako kunalibe chisonkhezero chachikulu.
Kutalika kwa CPHA kumatsimikizira ngati wotchi ya synchronous imasonkhanitsa deta pamphepete mwa wotchi yoyamba kapena yachiwiri,
Pamene CPHL=0, sonkhanitsani deta kumapeto kwa kusintha koyamba;
Kuphatikiza kwa mitundu iwiriyi njira zinayi zoyankhulirana za SPI, ndipo SPI0 imagwiritsidwa ntchito kwambiri ku China, komwe CPHL=0 ndi CPOL=0

ESP32 WROOM 32E M gawo

Gawoli lili ndi chip ESP32-DOWD-V3 chomangidwira, Xtensa dual-core 32-bit LX6 microprocessor, ndipo imathandizira mawotchi mpaka 240MHz. Ili ndi 448KB ROM, 520KB SRAM, 16KB RTC SRAM, ndi 4MB QSPI Flash. 2.4 GHz WIFI,
Bluetooth V4.2 ndi ma module a Bluetooth Low Power amathandizidwa. Ma GPIO 26 akunja, SD khadi yothandizira, UART, SPI, SDIO, I2C, LED PWM, motor PWM, I2S, IR, pulse counter, GPIO, capacitive touch sensor, ADC, DAC, TWAI ndi zotumphukira zina.

Khadi la MicroSD Slot

Kugwiritsa ntchito njira yolumikizirana ya SPI ndi kulumikizana kwa ESP32, kuthandizira kwamakhadi a MicroSD amitundu yosiyanasiyana.

RGB Mitundu itatu Kuwala

Magetsi ofiira, obiriwira, ndi abuluu a LED angagwiritsidwe ntchito kusonyeza momwe pulogalamuyo ikugwirira ntchito.

Seri Port

Gawo lakunja la doko lakunja limagwiritsidwa ntchito polumikizana ndi serial port.

USB kupita ku Serial Port ndikudina kumodzi Tsitsani Circuit

Chipangizo chachikulu ndi CH340C, mbali imodzi imalumikizidwa ndi kompyuta ya USB, mbali imodzi imalumikizidwa ndi doko la ESP32, kuti mukwaniritse USB kupita kudoko la TTL.
Kuphatikiza apo, kutsitsa kumodzi kumalumikizidwanso, ndiye kuti, mukatsitsa pulogalamuyo, imatha kulowa munjira yotsitsa, popanda kufunikira kukhudza zakunja.

Battery Interface

Maonekedwe a pini ziwiri, imodzi ya electrode yabwino, imodzi ya electrode negative, kuti mupeze mphamvu ya batri ndi kulipiritsa.

Battery Charge ndi Discharge Management Circuit

Chipangizo chapakati ndi TP4054, derali limatha kuwongolera batire pakalipano, batire imayimbidwa bwino kuti ifike pamalo okhazikika, komanso imatha kuwongolera kutulutsa kwa batri.

BOOT Key

Gawo lowonetsera litayatsidwa, kukanikiza kudzatsitsa IO0. Ngati nthawi yomwe gawoli layatsidwa kapena ESP32 yakhazikitsidwa, kutsitsa IO0 kudzalowa munjira yotsitsa. Nkhani zina zitha kugwiritsidwa ntchito ngati mabatani wamba.

Mtundu-C Chiyankhulo

Chiwonetsero chachikulu chamagetsi ndi mawonekedwe otsitsa pulogalamu ya gawo lowonetsera. Lumikizani USB ku doko la serial ndikudina kamodzi kotsitsira dera, lingagwiritsidwe ntchito popereka mphamvu, kutsitsa ndi kulumikizana kwakanthawi.

5V mpaka 3.3V Voltagndi Regulator Circuit

Chipangizo chachikulu ndi chowongolera cha ME6217C33M5G LDO.

VoltagE regulator circuit imathandizira 2A V ~ 6.5V lonse voltage input, 3.3V stable voltage linanena bungwe, ndipo kutulutsa kwakukulu komweku ndi 800mA, komwe kumatha kukwaniritsa voliyumutage ndi zofunikira zapano za module yowonetsera.

Bwezeraninso Kiyi

Gawo lowonetsera litayatsidwa, kukanikiza kudzakokera pini yokhazikitsiranso ESP32 pansi (malo osakhazikika amakoka), kuti mukwaniritse ntchito yokonzanso.

Resistive Touch Screen Control Circuit

Chipangizo chachikulu ndi XPT2046, chomwe chimalumikizana ndi ESP32 kudzera mu SPI.
Dera ili ndi mlatho pakati pa chotchinga chotchinga chotchinga ndi mbuye wa ESP32, yemwe ali ndi udindo wotumiza zidziwitso pakompyuta kupita kwa mbuye wa ESP32, kuti apeze zolumikizira za malo okhudza.

Wonjezerani Pin

Doko la IO lolowera, GND, ndi 3.3V pini zomwe sizigwiritsidwa ntchito pa gawo la ESP32 zimatsogozedwa kuti zigwiritsidwe ntchito mozungulira.

Backlight control circuit

Chipangizo chapakati ndi chubu cha BSS138.
Mapeto amodzi a derali amalumikizidwa ndi pini yowongolera kuwala kwa backlight pa ESP32 master, ndipo mbali inayo imalumikizidwa ndi mtengo woyipa wa LCD screen backlight LED l.amp.
Pini yowongolera ma backlight imakoka, kuwala kumbuyo, kwina kuzimitsa.

Mawonekedwe a speaker

Mawaya ma terminals ayenera kulumikizidwa molunjika. Amagwiritsidwa ntchito pofikira ma mono speaker ndi zokuzira mawu.

Mphamvu zomvera amplifier circuit

Chipangizo chachikulu ndi mawu a FM8002E ampwopereka IC.
Mapeto amodzi a derali amalumikizidwa ndi pini yotulutsa mtengo ya ESP32 audio DAC ndipo mbali inayo imalumikizidwa ndi mawonekedwe a nyanga.
Ntchito ya dera ili ndikuyendetsa lipenga lamphamvu laling'ono kapena sipika kuti limveke. Pamagetsi a 5V, mphamvu yayikulu yoyendetsa ndi 1.5W (katundu 8 ohms) kapena 2W (katundu 4 ohms).

SPI zotumphukira mawonekedwe

4-waya yopingasa mawonekedwe. Tulutsani pini yosankha chip yosagwiritsidwa ntchito ndi pini yolumikizira ya SPI yogwiritsidwa ntchito ndi khadi ya MicroSD, yomwe imatha kugwiritsidwa ntchito pazida zakunja za SPI kapena madoko wamba a IO.

Kufotokozera mwatsatanetsatane kwa chithunzi cha schematic cha module yowonetsera

Mtundu C mawonekedwe ozungulira

Muderali, D1 ndi diode ya Schottky, yomwe imagwiritsidwa ntchito kuletsa zomwe zikuchitika kuti zisinthe. D2 mpaka D4 ndi ma electrostatic surge protection diode kuti ateteze gawo lowonetsera kuti lisawonongeke chifukwa champhamvu kwambiri.tage kapena dera lalifupi. R1 ndiye kukana kukokera pansi. USB1 ndi basi ya Type-C. Gawo lowonetsera limalumikizana ndi magetsi amtundu wa C, kutsitsa mapulogalamu, ndikulumikizana kudzera pa USB 1. Komwe +5V ndi GND zili ndi mphamvu yamagetsi.tage ndi ma siginecha apansi USB_D ndi USB_D+ ndi ma siginecha a USB osiyanitsidwa, omwe amatumizidwa ku USB yam'mwamba kupita ku serial circuit.

5V mpaka 3.3V voltagndi woyang'anira dera

Muderali, C16 ~ C19 ndiye cholumikizira fyuluta, chomwe chimagwiritsidwa ntchito kusungitsa kukhazikika kwa voliyumu yolowera.tage ndi zotuluka voltage. U1 ndi 5V mpaka 3.3V LDO yokhala ndi nambala yachitsanzo ME6217C33M5G. Chifukwa mabwalo ambiri pamagawo owonetsera amafunikira mphamvu ya 3.3V, ndipo kuyika kwamphamvu kwa Type Cinterface kwenikweni ndi 5V, kotero vol.tage regulator kutembenuka dera likufunika.

Resistive touch screen control circuit

Muderali, C25 ndi C27 ndi bypass fyuluta capacitors, zomwe zimagwiritsidwa ntchito kusunga voliyumu yolowera.tagndi kukhazikika. R22 ndi chopinga chokokera mmwamba chomwe chimagwiritsidwa ntchito kuti chikhazikitso cha pini chikhale chokwera. U4 ndi XPT2046 control IC, Ntchito ya IC iyi ndikupeza mphamvu yolumikizira.tage mtengo wa touch point of the resistance touch screen kudzera pa X+, X –, Y+, ndi Y mapini anayi, kenako kudzera mu kutembenuka kwa ADC, mtengo wa ADC umaperekedwa kwa ESP32 master. Mbuye wa ESP32 ndiye amasintha mtengo wa ADC kukhala mtengo wamtundu wa pixel wowonetsera. Pini ya PEN ndi pini yosokoneza, ndipo mulingo wolowetsa umakhala wotsika pakachitika chochitika.

USB kupita ku doko la serial ndikudina kamodzi kutsitsa dera

Muderali, U3 ndi CH340C USB-to-serial IC, yomwe sifunikira oscillator yakunja ya kristalo kuti ithandizire kupanga dera. C6 ndi bypass fyuluta capacitor yomwe imagwiritsidwa ntchito kusunga voliyumu yoloweratagndi kukhazikika. Q1 ndi Q2 ndi ma triodes amtundu wa NPN, ndipo R6 ndi R7 ndi ma triode base ochepetsa zopinga zapano. Ntchito ya dera ili ndikuzindikira ku doko la USB-to-serial ndikudina kutsitsa ntchito. Chizindikiro cha USB ndikulowetsa ndi kutulutsa kudzera mu UD+ ndi UD mapini, ndipo imatumizidwa kwa mbuye wa ESP32 kudzera pa RXD ndi TXD mapini mutatha kutembenuka. Dinani kamodzi kutsitsa dera:

A. Zikhomo za RST ndi DTR za CH340C zotulutsa mulingo wapamwamba mokhazikika. Panthawiyi, Q1 ndi Q2 triode sizimayatsidwa, ndipo mapini a IO0 ndi mapini okonzanso a ESP32 main control amakokedwa mpaka apamwamba.
B. Zikhomo za RST ndi DTR za CH340C zotulutsa zotsika, panthawiyi, Q1 ndi Q2 triode sizilipo, ndipo mapini a IO0 ndi mapini obwezeretsanso a ESP32 akuwongolera akadali amakokedwa mpaka pamwamba.
C. Pini ya RST ya CH340C imakhalabe yosasinthika, ndipo pini ya DTR imatulutsa mulingo wapamwamba. Pakadali pano, Q1 idadulidwabe, Q2 idayatsidwa, pini ya IO0 ya mbuye wa ESP32 ikakokedwa, pini yokhazikitsiranso imatsitsidwa, ndipo ESP32 ilowa m'malo obwezeretsanso.

D. Pini ya CH340C ya RST imatulutsa mulingo wapamwamba, pini ya DTR imatulutsa mulingo wochepa, panthawiyi Q1 yayatsidwa, Q2 yazimitsidwa, pini yokhazikitsiranso ya ESP32 main control siidzakhala yokwera chifukwa cholumikizira cholumikizidwa chikuyimbidwa, ESP32 ikadali mu reset state, ndipo pini ya IO0 ikatsitsidwa nthawi yomweyo imatsitsidwa.

Mphamvu zomvera amplifier circuit

Muderali, R23, C7, C8, ndi C9 zimapanga RC zosefera, ndipo R10 ndi R13 ndizomwe zimasintha magwiridwe antchito. ampmpulumutsi. Pamene mtengo wotsutsa wa R13 sunasinthidwe, mtengo wotsutsa wa R10 wocheperako, wokulirapo wa wokamba nkhani wakunja. C10 ndi C11 ndi ma coupling capacitors olowa. R11 ndiye chokokera mmwamba. JP1 ndiye doko / doko loyankhulira. U5 ndi mphamvu ya audio ya FM8002E ampwopereka IC. Pambuyo polowetsa ndi AUDIO_IN, siginecha ya audio ya DAC imakhala ampzotsimikiziridwa ndi kupindula kwa FM8002E ndi zotulukapo kwa wokamba nkhani/wolankhulira ndi ma pini a VO1 ndi VO2. SHUTDOWN ndiye pini yothandizira FM8002E. Mulingo wochepa umathandizidwa. Mwachikhazikitso, mlingo wapamwamba umathandizidwa.

ESP32 WROOM 32E main control circuit

Muderali, C4 ndi C5 ndi bypass fyuluta capacitor, ndipo U2 ndi ESP32 WROOM 32E modules. Kuti mudziwe zambiri za gawo lamkati la gawoli, chonde onani zolembedwa zovomerezeka.

Kiyi yobwezeretsanso dera

Muderali, KEY1 ndiye fungulo, R4 ndiye chokokera mmwamba, ndipo C3 ndiye wochedwa capacitor. Bwezerani mfundo:

A. Pambuyo poyatsa, C3 amalipira. Panthawiyi, C3 ikufanana ndi dera lalifupi, pini ya RESET imakhazikika, ndipo ESP32 imalowa m'malo okonzanso.
B. C3 ikachajidwa, C3 imafanana ndi kutsegula dera, pini ya RESET imakokedwa, kubwezeretsanso kwa ESP32 kwatha, ndipo ESP32 imalowa m'malo ogwirira ntchito.

C. KEY1 ikakanikizidwa, pini ya RESET imakhazikika, ESP32 imalowa m'malo okonzanso, ndipo C3 imatulutsidwa kudzera mu KEY1.
D. KEY1 ikatulutsidwa, C3 imaperekedwa. Panthawiyi, C3 ikufanana ndi dera lalifupi, pini ya RESET imakhazikitsidwa, ESP32 ikadali mu RESET state. C3 ikatha, pini yokhazikitsiranso imakokedwa, ESP32 imakhazikitsidwanso ndikulowa m'malo ogwirira ntchito.

Ngati RESET sinapambane, mtengo wololera wa C3 ukhoza kuwonjezeka moyenerera kuti muchedwetse pini yobwezeretsanso nthawi yotsika.

Chiyankhulo chozungulira cha module ya serial

Muderali, P2 ndi 4P 1.25mm phula mpando, R29 ndi R30 ndi impedance balance resistors, ndipo Q5 ndi munda zotsatira chubu kulamulira 5V athandizira magetsi.

R31 ndi chotsutsa chotsitsa. Lumikizani RXD0 ndi TXD0 ku ma serial pin, ndikupereka mphamvu kumapini ena awiriwo. Doko ili ndi lolumikizidwa ku doko lofanana ndi doko la USB-to-serial port module.

EX pand IO ndi ma peripheral interface circuits

Muderali, P3 ndi P4 ndi mipando ya 4P 1.25mm. SPI_CLK, SPI_MISO, ndi mapini a SPI_MOSI amagawidwa ndi mapini a SPI khadi ya MicroSD. Zikhomo SPI_CS, IO35 sagwiritsidwa ntchito pazida za board, kotero amatsogozedwa kuti alumikizane ndi SPI, ndipo angagwiritsidwenso ntchito pa IO wamba. Zomwe muyenera kuyang'anira:

A. IO35 ikhoza kukhala mapini olowera.

Battery charge and discharge management circuit

Muderali, C20, C21, C22, ndi C23 ndi bypass fyuluta capacitors. U6 ndiye kasamalidwe ka batire la TP4054 IC. R27 imayang'anira kuchuluka kwa batire. JP2 ndi mpando wa 2P 1.25mm, wolumikizidwa ndi batri. Q3 ndi P-channel FET. R28 ndiye gawo la Q3 chokokera pansi. TP4054 imayitanitsa batire kudzera pa pini ya BAT; chocheperako cha R27 kukana, chokulirapo cholipiritsa, chokhala ndi pazipita ndi 500mA. Q3 ndi R28 palimodzi amapanga gawo lotulutsa batire, Pamene palibe magetsi kudzera pa mawonekedwe a Type C, + 5V vol.tage ndi 0, ndiye chipata cha Q3 chimatsitsidwa pansi, kukhetsa ndi gwero zili, ndipo batri imapereka mphamvu ku gawo lonse lowonetsera. Ikayendetsedwa ndi mawonekedwe a Type C, +5V voltage ndi 5V, ndiye chipata cha Q3 ndi 5V pamwamba, kukhetsa ndi gwero zimadulidwa, ndipo batire imasokonekera.

1 8P LCD gulu waya kuwotcherera mawonekedwe

Muderali, C24 ndiye bypass fyuluta capacitor, ndipo QD1 ndi 48P 0.8mm phula madzi crystal chophimba kuwotcherera mawonekedwe. QD1 ili ndi pini ya siginecha yotsutsa, LCD screen voltagpini ya e, pini yolumikizirana ya SPI, pini yowongolera ndi pini yoyendera ma backlight. ESP32 imagwiritsa ntchito zikhomozi kuwongolera LCD ndi touch screen.

Tsitsani chigawo chofunikira

Muderali, KEY2 ndiye fungulo ndipo R5 ndiye kukoka mmwamba. IO0 ndi yokwera mwachisawawa komanso yotsika pamene KEY2 ikanikizidwa. Dinani ndikugwira KEY2, yambitsani kapena yambitsaninso, ndipo ESP32 idzalowetsamo kutsitsa. Nthawi zina, KEY2 itha kugwiritsidwa ntchito ngati kiyi wamba.

Kuzindikira mphamvu ya batri

Muderali, R2 ndi R3 ndi gawo la voltage resistors, ndi C1 ndi C2 ndi bypass fyuluta capacitors. Mphamvu ya batri voltagKulowetsa kwa ma sign a BAT + kumadutsa pagawo logawanitsa. BAT_ADC ndiye voltage mtengo pamapeto onse a R3, omwe amatumizidwa kwa mbuye wa ESP32 kudzera pa pini yolowera ndikusinthidwa ndi ADC kuti pamapeto pake apeze mphamvu ya batri.tagndi mtengo. Voltage divider imagwiritsidwa ntchito chifukwa ESP32 ADC imatembenuza kuchuluka kwa 3.3V, pomwe batire yodzaza mphamvu.tage ndi 4.2V, yomwe ili kunja kwake. Voltage kuchulukitsidwa ndi 2 ndiye batire yeniyeni voltage.

LCD backlight control circuit

Muderali, R24 ndiye kukana kosokoneza ndipo imasungidwa kwakanthawi. Q4 ndi N-channel field effect chubu, R25 ndiye Q4 grid pull-down resistor, ndipo R26 ndiye backlight current limiting resistor. LCD backlight LED Lamp ili mu chikhalidwe chofanana, mtengo wabwino umagwirizanitsidwa ndi 3.3V, ndipo mtengo woipa umagwirizanitsidwa ndi kukhetsa kwa Q4. Pamene pini yowongolera LCD_BL imatulutsa mphamvu zambiritage, kukhetsa ndi zitsulo za Q4 zimayatsidwa. Panthawiyi, mzati woipa wa LCD backlight wakhazikika, ndi kuwala kwa LED Lamp imayatsidwa ndikutulutsa kuwala.
Pini yowongolera LCD_BL ikatulutsa mphamvu yotsikatage, kukhetsa ndi gwero la Q4 zadulidwa, ndipo kuwala koyipa kwa chophimba cha LCD kuyimitsidwa, ndi kuwala kwa LED l.amp sichiyatsidwa. Mwachikhazikitso, LCD backlight yazimitsidwa.

Kuchepetsa kukana kwa R26 kumatha kukulitsa kuwala kowala kwa backlight.
Kuphatikiza apo, pini ya LCD_BL imatha kulowetsa chizindikiro cha PWM kuti isinthe kuwala kwa LCD.

RGB yowongolera kuwala kwamitundu itatu

Muderali, LED2 ndi RGB yamitundu itatu lamp, ndipo R14~R16 ndi l wamitundu itatuamp panopa kuchepetsa resistor.
LED2 ili ndi nyali zofiira, zobiriwira, ndi zabuluu za LED, zomwe ndizomwe zimagwirizanitsa ndi anode.

IO16, IO17 ndi IO22 ndi zikhomo zitatu zowongolera, zomwe zimayatsa nyali za LED pamlingo wochepa ndikuzimitsa nyali za LED pamlingo wapamwamba.

MicroSD khadi slot mawonekedwe dera

Muderali, SD_CARD1 ndi MicroSD khadi slot. R17 mpaka R21 ndi zokokera mmwamba pa pini iliyonse. C26 ndiye bypass fyuluta capacitor. Dera lolumikizirali limatengera njira yolumikizirana ya SPI. Imathandizira kusungirako mwachangu kwamakhadi a MicroSD.
Dziwani kuti mawonekedwewa amagawana basi ya SPI ndi mawonekedwe a SPI otumphukira.

Njira zodzitetezera pakugwiritsa ntchito ma module

Chiwonetsero chowonetsera chimayikidwa ndi batri, wokamba nkhani wakunja amasewera mawu, ndipo chiwonetsero chowonetsera chikugwiranso ntchito; pakadali pano, zonse zomwe zilipo zitha kupitilira 500mA. Pankhaniyi, muyenera kulabadira kuchuluka kwapano komwe kumathandizidwa ndi chingwe cha Type C komanso kuchuluka komweko komwe kumathandizidwa ndi mawonekedwe amagetsi kuti mupewe magetsi osakwanira.

Mukamagwiritsa ntchito, musakhudze voliyumu ya LDOtage regulator ndi batire charge management IC ndi manja anu kuti musawotchedwe ndi kutentha kwambiri.
Mukalumikiza doko la IO, tcherani khutu ku kagwiritsidwe ntchito ka IO kuti mupewe kusokonekera ndipo tanthauzo la khodi ya pulogalamu silikugwirizana.
Gwiritsani ntchito mankhwalawa mosamala komanso moyenera.

FAQ

Q: Ndingapeze bwanji ma sampmapulogalamu ndi mapulogalamu library?
- A: Aample mapulogalamu ndi malaibulale angapezeke mu 1-_Demo chikwatu cha mafotokozedwe azinthu.
Q: Ndi zida ziti zomwe zikuphatikizidwa mu pulogalamu yazida?
- A: Pulogalamu yachidayi imaphatikizapo WIFI ndi Bluetooth test APP, zida zowonongeka, USB kupita ku serial port driver, ESP32 Flash download tool software, mapulogalamu otengera khalidwe, mapulogalamu otengera zithunzi, mapulogalamu opangira zithunzi za JPG, ndi zida zowonongeka kwa doko.

Zolemba / Zothandizira

Chithunzi cha LCD E32R28T 2.8inch ESP32-32E [pdf] Buku Logwiritsa Ntchito
E32R28T, E32N28T, E32R28T 2.8inch ESP32-32E Display Module, E32R28T, 2.8inch ESP32-32E Display Module, ESP32-32E Display Module, Display Module, Moduli

Maumboni

Buku Logwiritsa Ntchito

Chithunzi cha LCD E32R28T 2.8inch ESP32-32E

Zofotokozera

Zambiri Zamalonda