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Modúl Taisbeanaidh LCD wiki E32R28T 2.8 òirleach ESP32-32E

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-PRODUCT

Sònrachaidhean

  • Ainm Bathar: ESP2.8-32E E32R32T & E28N32T 28 òirleach
  • Modail: CR2024-MI2875
  • Display Module: 2.8-inch ESP32-32E

Fiosrachadh toraidh

  • This product is a 2.8-inch ESP32-32E E32R28T&E32N28T display module with various hardware and software resources for development.

Stiùireadh airson cleachdadh bathar

  • Tha an eòlaire ghoireasan a’ gabhail a-steach sample programs, software libraries, product specifications, structure diagrams, datasheets, schematics, user manuals, and tool software.
  • Tha an earrann seo a’ toirt seachad cusview of the hardware resources available on the module.
  • Explains the schematic diagram of the display module in detail.
  • Provides precautions to be taken while using the display module.

Tuairisgeul air Goireas

  • Tha an clàr ghoireasan ri fhaicinn san fhigear a leanas:

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-1

Eòlaire Tuairisgeul susbaint
1-Demo Na sample còd a’ phrògraim, an leabharlann bathar-bog treas-phàrtaidh a tha an sample prògram an urra, an leabharlann bathar-bog treas-phàrtaidh a chuir an àite file, an sgrìobhainn stiùiridh suidheachadh àrainneachd leasachadh bathar-bog, agus an sample program instruction

sgrìobhainn.

2-Sònrachadh Sònrachadh toraidh modal taisbeanaidh, sònrachadh sgrion LCD agus còd tòiseachaidh IC draibhear taisbeanaidh LCD.
3-Structar_Diagram Taisbeanaidh tomhasan toraidh modal agus dealbhan toraidh 3D
4-Duilleag-dàta Leabhar dàta draibhear taisbeanaidh LCD ILI9341, leabhar dàta draibhear sgrion-suathaidh strì an aghaidh XPT2046, leabhar dàta maighstir ESP32 agus sgrìobhainn stiùiridh dealbhaidh bathar-cruaidh, leabhar dàta USB gu IC sreathach (CH340C), claisneachd amplifier chip FM8002E data book, 5V to 3.3V regulator data book

and battery charge management Chip TP4054 data sheet.

5-Sgeamatach Product hardware schematic, ESP32-WROOM-32E module IO resource allocation table, schematic, and PCB component package
6-Leabhar-làimhe_chleachdaiche Sgrìobhainnean cleachdaiche toraidh
7-Inneal_bathar-bog Innealan deuchainn is dì-bhugachaidh airson WIFI is Bluetooth, draibhear USB gu port sreathach, bathar-bog inneal luchdachadh sìos Flash ESP32, bathar-bog togail charactaran, bathar-bog togail ìomhaigh, bathar-bog giullachd ìomhaigh JPG

and serial port debugging tools.

8-Quick_Start Need to burn the bin file, flash the download tool, and use the instructions.

Stiùireadh bathar-bog

Tha na ceumannan leasachaidh bathar-bog modal taisbeanaidh mar a leanas:

  • A. Tog àrainneachd leasachaidh bathar-bog àrd-ùrlar ESP32.
  • B. If necessary, import third-party software libraries as a basis for development;
  • C. Open the software project to be debugged, or you can also create a new software project.
  • D. power on the display module, compile and download the debugging program, and then check the software running effect.
  • E. The software effect does not reach the expected, continue to modify the program code, and then compile and download, until the effect reaches the expected.
    For details about the preceding steps, see the documentation in the 1 Demo directory.

Stiùireadh bathar-cruaidh

Thairisview of the module’s hardware resources is displayed

  • Tha goireasan bathar-cruaidh modal air an sealltainn anns an dà fhigear a leanas:

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-2

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-3

Tha na goireasan bathar-cruaidh air am mìneachadh mar a leanas:

LCD

  • The LCD display size is 2.8 inches, the driver IC is ILI9341, and the resolution is 24 0x 32 0. The ESP32 is connected using a 4-wire SPI communication interface.
  • A. Introduction to ILI9341 controller The ILI9341 controller supports a maximum resolution of 240*320 and a 172800-byte GRAM. It also supports 8-bit, 9-bit, 16-bit, and 18-bit parallel port data buses. It also supports 3-wire and 4-wire SPI serial ports. Since parallel control requires a large number of I/O ports, the most common one is SPI serial port control. The ILI9341 also supports 65K, 262K RGB color display, display color is very rich, while supporting rotating display and scroll display and video playback, and displaying in a variety of ways.
  • Bidh an rianadair ILI9341 a’ cleachdadh 16bit (RGB565) gus smachd a chumail air taisbeanadh piogsail, gus an urrainn dha suas ri dathan 65K gach piogsail a thaisbeanadh. Tha an suidheachadh seòladh piogsail air a dhèanamh ann an òrdugh sreathan agus cholbhan, agus tha an stiùireadh meudachaidh is lughdachadh air a dhearbhadh leis a’ mhodh sganaidh. Tha an dòigh taisbeanaidh ILI9341 air a choileanadh le bhith a’ suidheachadh an t-seòlaidh agus an uairsin a’ suidheachadh an luach dath.
  • B. Ro-ràdh do phròtacal conaltraidh SPI

Tha àm modh sgrìobhaidh a’ bhus SPI 4-uèir ri fhaicinn san fhigear a leanas:

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-4

  • Is e taghadh chip tràillean a th’ ann an CSX, agus cha tèid a’ chip a chomasachadh ach nuair a tha CSX aig ìre cumhachd ìosal.
  • Is e D / CX am prìne smachd dàta / àithne den chip. Nuair a tha DCX a’ sgrìobhadh òrdughan aig ìrean ìosal, tha dàta air a sgrìobhadh aig ìrean àrda
  • SCL is the SPI bus clock, with each rising edge transmitting 1 bit of data.
  • Is e SDA an dàta a thèid a ghluasad le SPI, a bhios a’ sgaoileadh 8 pìosan dàta aig an aon àm. Tha cruth an dàta air a shealltainn anns an fhigear a leanas:

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-5

  • Pìos àrd an toiseach, tar-chuir an toiseach.
  • Airson conaltradh SPI, tha àm tar-chuir aig dàta, le measgachadh de ìre gleoc fìor-ùine (CPHA) agus polarity cloc (CPOL):
  • Bidh an ìre CPOL a’ dearbhadh ìre staid leisg a’ ghleoc sioncronaich sreathach, le CPOL = 0, a’ comharrachadh ìre ìosal. Pròtacal tar-chuir paidhir CPOL
  • The discussion did not have much influence.
  • Bidh àirde CPHA a’ dearbhadh a bheil an gleoc sioncronaich sreathach a’ cruinneachadh dàta air oir leum a’ chiad no an dàrna cloc,
  • Nuair a bhios CPHL=0, dèan cruinneachadh dàta aig a’ chiad oir gluasaid;
  • Tha an cothlamadh den dà seo a’ cruthachadh ceithir dòighean conaltraidh SPI, agus tha SPI0 air a chleachdadh gu cumanta ann an Sìona, far a bheil CPHL = 0 agus CPOL = 0

ESP32 WROOM 32E M odule

  • This module has a built-in ESP32-DOWD-V3 chip, an Xtensa dual-core 32-bit LX6 microprocessor, and supports clock rates up to 240MHz. It has 448KB ROM, 520KB SRAM, 16KB RTC SRAM, and 4MB QSPI Flash. 2.4GHz WIFI,
  • Bluetooth V4.2 and Bluetooth Low Power modules are supported. External 26 GPIOs, support SD card, UART, SPI, SDIO, I2C, LED PWM, motor PWM, I2S, IR, pulse counter, GPIO, capacitive touch sensor, ADC, DAC, TWAI and other peripherals.

Sliotan Cairt MicroSD

  • A’ cleachdadh modh conaltraidh SPI agus ceangal ESP32, taic airson cairtean MicroSD de dhiofar chomasan.

RGB Three color Light

  • Red, green, and blue LED lights can be used to indicate the running status of the program.

Port sreathach

  • Tha modal port sreathach taobh a-muigh air a chleachdadh airson conaltradh port sreathach.

USB to Serial Port and One-click Download Circuit

  • Is e am prìomh inneal CH340C, tha aon cheann ceangailte ris a’ choimpiutair USB, tha aon cheann ceangailte ri port sreathach ESP32, gus USB gu port sreathach TTL a choileanadh.
  • In addition, a one-click download circuit is also attached, so that is, when downloading the program, it can automatically enter the download mode, without the need to touch the external.

Eadar-aghaidh bataraidh

  • Two-pin interface, one for the positive electrode, one for the negative electrode, to access the battery power supply and charging.

Battery Charge and Discharge Management Circuit

  • The core device is TP4054, this circuit can control the battery charging current, the battery is safely charged to saturation state, but can also safely control the battery discharge.

Iuchair BOOT

  • Às deidh don mhodal taisbeanaidh a bhith air a chuir air adhart, lughdaichidh putadh sìos IO0. Ma thèid am modal a chuir air adhart no ma thèid an ESP32 ath-shuidheachadh, thèid ìsleachadh IO0 a-steach don mhodh luchdaich sìos. Faodar cùisean eile a chleachdadh mar phutanan àbhaisteach.

Eadar-aghaidh Type-C

  • The main power supply interface and program download interface of the display module. Connect the USB to a serial port and a one-click download circuit, can be used for power supply, download and serial communication.

5V gu 3.3V Voltage Circuit Riaghladair

  • The core device is the ME6217C33M5G LDO regulator.
  • Tha an voltage regulator circuit supports 2A V~6.5V wide voltage input, a 3.3V stable voltage toradh, agus is e an sruth toraidh as àirde 800mA, a choinnicheas gu h-iomlan ris an voltage agus riatanasan làithreach a 'mhodail taisbeanaidh.

Ath-shuidhich iuchair

  • Às deidh don mhodal taisbeanaidh a bhith air a chuir air adhart, le putadh tarraingidh e sìos am prìne ath-shuidheachadh ESP32 (tha an stàit bunaiteach a ’tarraing suas), gus an gnìomh ath-shuidheachadh a choileanadh.

Cearcall smachd sgrion suathaidh resistant

  • Is e am prìomh inneal XPT2046, a bhios a’ conaltradh ris an ESP32 tro SPI.
  • Is e an cuairteachadh seo an drochaid eadar an scrion suathaidh resistive agus am maighstir ESP32, le uallach airson an dàta air an scrion suathaidh a chuir chun mhaighstir ESP32, gus co-chomharran a’ phuing suathaidh fhaighinn.

Leudaich am Pin

  • An input IO port, GND, and 3.3V pin that are not used on the ESP32 module are led out for peripheral use.

Cearcall smachd backlight

  • The core device is a BSS138 field-effect tube.
  • One end of this circuit is connected to the backlight control pin on the ESP32 master, and the other end is connected to the negative pole of the LCD screen backlight LED lamp.
  • Backlight control pin pull up, back light, otherwise off.

Eadar-aghaidh neach-labhairt

  • Feumaidh cinn-uidhe uèirleas a bhith ceangailte gu dìreach. Air a chleachdadh gus cothrom fhaighinn air luchd-labhairt mono agus glaodhairean.

Cumhachd fuaim ampcuairt-solais

  • Is e am prìomh inneal claisneachd FM8002E ampIC nas beòthaile.
  • One end of this circuit is connected to the ESP32 audio DAC value output pin and the other end is connected to the horn interface.
  • The function of this circuit is to drive a small power horn or speaker to sound. For 5V power supply, the maximum drive power is 1.5W (load 8 ohms) or 2W (load 4 ohms).

SPI eadar-aghaidh iomaill

  • Eadar-aghaidh còmhnard 4-uèir. Stiùir a-mach prìne taghadh chip nach deach a chleachdadh agus prìne eadar-aghaidh SPI air a chleachdadh leis a’ chairt MicroSD, a ghabhas cleachdadh airson innealan SPI taobh a-muigh no puirt IO àbhaisteach.

Detailed explanation of the schematic diagram of the display module

Type C interface circuit

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-6

Anns a’ chuairt seo, is e D1 an diode Schottky, a thathas a’ cleachdadh gus casg a chuir air an t-sruth bho bhith a’ dol air ais. Tha D2 gu D4 nan deochan dìon gèilleadh electrostatach gus casg a chuir air a’ mhodal taisbeanaidh bho bhith air a mhilleadh air sgàth cus voltage or short circuit. R1 is the pull-down resistance. USB1 is a Type-C bus. The display module connects to Type C power supply, downloads programs, and communicates through the USB 1. Where +5V and GND are positive power voltage and ground signals USB_D and USB_D+ are differential USB signals, which are transmitted to the onboard USB to serial circuit.

5V gu 3.3V voltagagus cuairteachadh riaghlaiche

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-7

Anns a ’chuairt seo, is e C16 ~ C19 an capacitor sìoltachain seach-rathad, a thathas a’ cleachdadh gus seasmhachd an in-ghabhail a chumail suastage agus an toradh leabtage. The U1 is a 5V to 3.3V LDO with the model number ME6217C33M5G. Because most of the circuits on the display module need a 3.3V power supply, and the power input of the Type Cinterface is basically 5V, so a voltagTha feum air cuairt tionndaidh riaghlaiche.

Cuairt smachd sgrion suathaidh seasmhach

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-8

Anns a ’chuairt seo, tha C25 agus C27 nan capacitor sìoltachain seach-rathad, a thathas a’ cleachdadh gus an toirt a-steach a chumail suastage stability. R22 is a pull-up resistor used to maintain the default pin state as high. U4 is the XPT2046 control IC, The function of this IC is to obtain the coordinate voltage value of the touch point of the resistance touch screen through X+, X –, Y+, and Y four pins, and then through ADC conversion, the ADC value is transmitted to the ESP32 master. The ESP32 master then converts the ADC value to the pixel coordinate value of the display. The PEN pin is a touch interrupt pin, and the input level is low when a touch event occurs.

USB to serial port and one-click download circuit

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-9

Anns a ’chuairt seo, tha U3 na IC USB-gu-sreath CH340C, nach eil feumach air oscillator criostail taobh a-muigh gus dealbhadh cuairteachaidh a dhèanamh comasach. Tha C6 na capacitor sìoltachain seach-rathad a thathas a’ cleachdadh gus an cuir a-steach voltage stability. Q1 and Q2 are NPN-type triodes, and R6 and R7 are triode base limiting current resistors. The function of this circuit is to realize to USB-to-serial port and a click download function. The USB signal is input and output through UD+ and UD pins, and is transmitted to the ESP32 master through RXD and TXD pins after conversion. One-click download circuit principle:

  • A. Bidh na prìnichean RST agus DTR de CH340C a’ toirt a-mach ìre àrd gu bunaiteach. Aig an àm seo, chan eil an triode Q1 agus Q2 air adhart, agus tha na prìnichean IO0 agus prìneachan ath-shuidheachadh prìomh smachd ESP32 air an tarraing suas gu ìre àrd.
  • B. Tha na prìnichean RST agus DTR de CH340C a’ toirt a-mach ìrean ìosal, aig an àm seo, chan eil an triode Q1 agus Q2 fhathast air adhart, agus tha prìneachan IO0 agus prìneachan ath-shuidheachadh prìomh smachd ESP32 fhathast air an tarraing suas gu ìrean àrda.
  • C. The RST pin of CH340C remains unchanged, and the DTR pin outputs a high level. At this time, Q1 is still cut off, Q2 is on, the IO0 pin of the ESP32 master is still pulled up, the reset pin is pulled down, and the ESP32 enters the reset state.
  • D. Bidh prìne RST CH340C a’ toirt a-mach ìre àrd, bidh prìne DTR a ’toirt a-mach ìre ìosal, aig an àm seo tha Q1 air, tha Q2 dheth, cha bhith prìne ath-shuidheachadh prìomh smachd ESP32 a’ fàs àrd sa bhad leis gu bheil an capacitor ceangailte air a ghearradh, tha ESP32 fhathast anns an stàit ath-shuidheachadh, agus tha prìne IO0 air a shlaodadh sa bhad, aig an àm seo thèid e a-steach don mhodh luchdaich sìos.

Cumhachd fuaim ampcuairt-solais

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-10

In this circuit, R23, C7, C8, and C9 constitute the RC filter circuit, and R10 and R13 are the gain-adjusting resistors of the operational amplosgadair. Nuair a tha luach an aghaidh R13 gun atharrachadh, mar as lugha an luach an aghaidh R10, is ann as motha a bhios meud an neach-labhairt bhon taobh a-muigh. Tha C10 agus C11 nan capacitors ceangail a-steach. Is e R11 an resistor tarraing-suas. Is e JP1 am port adharc / neach-labhairt. Is e an U5 an cumhachd claisneachd FM8002E amplasadair IC. Às deidh cuir a-steach le AUDIO_IN, tha an comharra claisneachd DAC amplified by the FM8002E gain and output to the speaker/speaker by the VO1 and VO2 pins. SHUTDOWN is the enable pin for FM8002E. The low level is enabled. By default, the high level is enabled.

ESP32 WROOM 32E main control circuit

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-11

In this circuit, C4 and C5 are bypass filter capacitors, and U2 are ESP32 WROOM 32E modules. For details about the internal circuit of this module, please refer to the official documentation.

Ath-shuidheachadh prìomh chuairt

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-12

Anns a ’chuairt seo, is e KEY1 an iuchair, is e R4 an resistor tarraing-suas, agus is e C3 an capacitor dàil. Prionnsabal ath-shuidheachadh:

  • A. After powering on, C3 charges. At this time, C3 is equivalent to a short circuit, the RESET pin is grounded, and ESP32 enters the reset state.
  • B. Nuair a thèid C3 a ghearradh, tha C3 co-ionann ri cuairteachadh fosgailte, tha prìne RESET air a tharraing suas, tha ath-shuidheachadh ESP32 deiseil, agus bidh an ESP32 a’ dol a-steach don staid obrach àbhaisteach.
  • C. Nuair a thèid KEY1 a bhrùthadh, tha am prìne RESET stèidhichte, bidh ESP32 a’ dol a-steach don stàit ath-shuidheachadh, agus tha C3 air a sgaoileadh tro KEY1.
  • D. Nuair a thèid KEY1 a leigeil ma sgaoil, tha C3 fo chasaid. Aig an àm seo, tha C3 co-ionann ri cuairt ghoirid, tha prìne RESET stèidhichte, tha ESP32 fhathast ann an staid RESET. Às deidh cosgais C3, thèid am prìne ath-shuidheachadh a tharraing suas, thèid ESP32 ath-shuidheachadh agus thèid e a-steach don stàit obrach àbhaisteach.

Mura h-eil an RESET soirbheachail, faodar luach fulangas C3 àrdachadh gu h-iomchaidh gus dàil a chuir air ùine ìre ìosal prìne ath-shuidheachadh.

Interface circuit of the serial module

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-13

  • Anns a ’chuairt seo, tha P2 na chathair pitch 4P 1.25mm, tha R29 agus R30 nan luchd-dìon cothromachaidh bacadh, agus tha Q5 na phìob buaidh achaidh a’ cumail smachd air solar cumhachd cuir a-steach 5V.
  • R31 is a pulldown resistor. Connect RXD0 and TXD0 to serial pins, and supply power to the other two pins. This port is connected to the same serial port as the onboard USB-to-serial port module.

EX pand IO and peripheral interface circuits

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-14

In this circuit, P3 a nd P4 are 4P 1.25mm pitch seats. SPI_CLK, SPI_MISO, and SPI_MOSI pins are shared with the MicroSD card SPI pins. Pins SPI_CS, IO35 are not used by on board devices, so they are led out to connect SPI, and can also be used for ordinary IO. Things to watch out for:

  • A. IO35 can only be input pins.

Cosgais bataraidh agus cuairteachadh riaghlaidh sgaoilidh

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-15

In this circuit, C20, C21, C22, and C23 are bypass filter capacitors. U6 is the TP4054 battery charge management IC. R27 regulates the battery charging current. JP2 is a 2P 1.25mm pitch seat, connected to a battery. Q3 is a P-channel FET. R28 is the Q3 grid pull-down resistor. TP4054 charges the battery through the BAT pin; the smaller the R27 resistance, the larger the charging current, with a maximum is 500mA. Q3 and R28 together constitute the battery discharge circuit, When there is no power supply through the Type C interface, the +5V voltage is 0, then the Q3 gate is pulled down to a low level, the drain and the source are on, and the battery supplies power to the entire display module. When powered through the Type C interface, the +5V voltage 5V, an uairsin tha geata Q3 5V àrd, tha an drèanadh agus an stòr air an gearradh dheth, agus tha stad air solar bataraidh.

1 8P LCD panel wire welding interface

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-16

Anns a ’chuairt seo, is e C24 an capacitor sìoltachain seach-rathad, agus is e QD1 an eadar-aghaidh tàthaidh sgrion criostail leaghan pitch 48P 0.8mm. Tha prìne comharra sgrion suathaidh aig an QD1, sgrion LCD voltage prìne, prìne conaltraidh SPI, prìne smachd agus prìne cuairteachaidh backlight. Bidh an ESP32 a’ cleachdadh na prìneachan sin gus smachd a chumail air an LCD agus an scrion suathaidh.

Download the key circuit

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-17

  • In this circuit, KEY2 is the key and R5 is the pull up resistor. IO0 is high by default and low when KEY2 is pressed. Press and hold KEY2, power on or reset, and the ESP32 will enter download mode. In other cases, KEY2 can be used as a normal key.

Cuairt lorg cumhachd bataraidh

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-18

Anns a’ chuairt seo, tha R2 agus R3 ann am pàirt voltage resistors, agus tha C1 agus C2 nan capacitor sìoltachain seach-rathad. Tha am bataraidh voltage cuir a-steach comharra BAT + a’ dol tron ​​resistor divider. 'S e BAT_ADC an leabhartage value at both ends of R3, which is transmitted to the ESP32 master through the input pin and then converted by ADC to finally obtain the battery voltage luach. Tha an voltagThathas a’ cleachdadh e divider leis gu bheil an ESP32 ADC ag atharrachadh 3.3V aig a’ char as àirde, fhad ‘s a tha sùghadh bataraidh voltagTha e 4.2V, a tha a-mach à raon. Gheibhear an leabhartage air iomadachadh le 2 tha an fhìor bataraidh voltage.

Cuairt smachd backlight LCD

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-19

  • Anns a ’chuairt seo, is e R24 an aghaidh dì-bhugachaidh agus thèid a chumail airson ùine. Is e Q4 an tiùb buaidh achaidh N-seanail, is e R25 an resistor slaodadh sìos clèithe Q4, agus is e R26 an resistor cuibhreachaidh sruth backlight. Tha an backlight LCD LED lamp ann an staid co-shìnte, tha am pòla dearbhach ceangailte ri 3.3V, agus tha am pòla àicheil ceangailte ri drèanadh Q4. Nuair a bheir am prìne smachd LCD_BL a-mach voltage, the drain and source poles of Q4 are switched on. At this time, the negative pole of the LCD backlight is grounded, and the backlight LED lamp air a chuir air agus a’ sgaoileadh solas.
  • When the control pin LCD_BL outputs a low voltage, tha an drèanadh agus stòr Q4 air an gearradh dheth, agus tha backlight àicheil an sgrion LCD air a chuir dheth, agus an backlight LED lamp chan eil e air a chuir air. Gu gnàthach, tha an backlight LCD dheth.
  • Faodaidh lughdachadh an aghaidh R26 an soilleireachd as àirde den backlight àrdachadh.
  • In addition, the LCD_BL pin can input a PWM signal to adjust the LCD backlight.

Cuairt smachd solais trì-dath RGB

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-21

  • Anns a’ chuairt seo, tha LED2 na l trì-dath RGBamp, agus tha R14 ~ R16 na l trì-dathamp current limiting resistor.
  • LED2 contains red, green, and blue LED lights, which are common anode connections.
  • IO16, IO17 and IO22 are three control pins, which light up LED lights at low level and extinguish the LED lights at high level.

Cuairt eadar-aghaidh slot cairt MicroSD

LCD-wiki-E32R28T-2-8inch-ESP32-32E-Display-Module-FIG-21

  • Anns a 'chuairt seo, is e SD_CARD1 an slot cairt MicroSD. Tha R17 gu R21 nan luchd-dìon tarraing-suas airson gach prìne. Is e C26 an capacitor sìoltachain seach-rathad. Bidh an cuairteachadh eadar-aghaidh seo a’ gabhail ri modh conaltraidh SPI. A ’toirt taic do stòradh àrd-astar de chairtean MicroSD.
  • Thoir an aire gu bheil an eadar-aghaidh seo a’ roinn a’ bhus SPI leis an eadar-aghaidh iomaill SPI.

Rabhaidhean airson cleachdadh modal taisbeanaidh

  1. The display module is charged with the battery, the external speaker plays the audio, and the display screen is also working; at this time, the total current may exceed 500mA. In this case, you need to pay attention to the maximum current supported by the Type C cable and the maximum current supported by the power supply interface to avoid an insufficient power supply.
  2. Nuair a bhios tu ga chleachdadh, na cuir suathadh air an LDO voltage riaghlaiche agus riaghladh cosgais bataraidh IC le do làmhan gus nach tèid do losgadh le teòthachd àrd.
  3. Nuair a cheanglas tu am port IO, thoir aire do chleachdadh IO gus mì-cheangal a sheachnadh agus chan eil mìneachadh còd a’ phrògraim a’ freagairt.
  4. Cleachd an toradh gu sàbhailte agus gu reusanta.

Ceistean Cumanta

  • C: Ciamar a gheibh mi cothrom air an sampprògraman agus leabharlannan bathar-bog?
    • A: Na sample programs and libraries can be found in the 1-_Demo directory of the resource description.
  • C: Dè na h-innealan a tha air an toirt a-steach don bhathar-bog innealan?
    • A: The tool software includes WIFI and Bluetooth test APP, debugging tools, USB to serial port driver, ESP32 Flash download tool software, character take-up software, image take-up software, JPG image processing software, and serial port debugging tools.

Sgrìobhainnean/Goireasan

Modúl Taisbeanaidh LCD wiki E32R28T 2.8 òirleach ESP32-32E [pdfLeabhar-làimhe an neach-cleachdaidh
E32R28T, E32N28T, E32R28T Modúl Taisbeanaidh ESP2.8-32E 32 òirleach, E32R28T, Modúl Taisbeanaidh ESP2.8-32E 32 òirleach, Modúl Taisbeanaidh ESP32-32E, Modúl Taisbeanaidh, Modúl

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