LCD wiki E32R28T 2.8 mirefy ESP32-32E Display Module User Manual

Ny lahatahiry loharano dia ahitana sample programs, software libraries, product specifications, structure diagrams, datasheets, schematics, user manuals, and tool software.
Ity fizarana ity dia manome mihoatraview 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.

Resource Description

Ny lahatahiry loharano dia aseho amin'ity sary manaraka ity:

Directory	Famariparitana votoaty
1-Demo	Ny sample code program, ny tranomboky rindrambaiko an'ny antoko fahatelo izay ny sampNy programa dia miankina amin'ny, ny fanoloana ny tranomboky rindrambaiko an'ny antoko fahatelo file, ny antontan-taratasy torolalana momba ny fananganana tontolo iainana fampandrosoana, ary ny sample program instruction antontan-taratasy.
2-famaritana	Asehoy ny mari-pamantarana vokatra modely, ny famaritana ny efijery LCD ary ny kaody fanombohana IC mpamily LCD.
3-Structure_Diagram	Asehoy ny haben'ny vokatra modely sy ny sary 3D vokatra
4-Takela-daza	Lcd display driver ILI9341 data book, fanoherana ecran ecran driver XPT2046 data book, ESP32 master data book and hardware design guide document, USB to Serial IC(CH340C) data book, audio amplifier chip FM8002E data book, 5V to 3.3V regulator data book and battery charge management Chip TP4054 data sheet.
5-Skema	Product hardware schematic, ESP32-WROOM-32E module IO resource allocation table, schematic, and PCB component package
6-User_Manual	Taratasy mpampiasa vokatra
7-Tool_software	WIFI sy Bluetooth fitsapana APP sy fitaovana debugging, USB mankany amin'ny seranan-tsambo serial, ESP32 Flash rindrambaiko fitaovana fampidinana, rindrankajy maka-karazana, rindrambaiko fakana sary, rindrambaiko fanodinana sary JPG and serial port debugging tools.
8-Quick_Start	Need to burn the bin file, flash the download tool, and use the instructions.

Torolàlana momba ny rindrambaiko

Toy izao manaraka izao ny dingana fampivoarana rindrambaiko modules:

A. Mamorona tontolo fampandrosoana rindrambaiko sehatra 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.

Torolàlana momba ny Hardware

TAPITRAview of the module’s hardware resources is displayed

Ny loharanon'ny fitaovana Module dia aseho amin'ireto tarehimarika roa manaraka ireto:

Ny loharanon'ny fitaovana dia nofaritana toy izao:

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.

Ny controller ILI9341 dia mampiasa 16bit (RGB565) hifehezana ny fampisehoana piksel, ka afaka mampiseho loko hatramin'ny 65K isaky ny piksel. Ny fametrahana adiresin'ny piksel dia atao amin'ny filaharan'ny andalana sy ny tsanganana, ary ny fizotry ny fitarafana no mamaritra ny lalana mitombo sy mihena. Ny fomba fampisehoana ILI9341 dia atao amin'ny fametrahana ny adiresy ary avy eo ny fametrahana ny sandan'ny loko.
B. Fampidirana ny protocole serasera SPI

Ny fotoana fanoratana amin'ny bus SPI 4-wire dia aseho amin'ity sary manaraka ity:

CSX dia safidy chip andevo, ary ny chip dia tsy ho afaka afa-tsy rehefa ambany ny herin'ny CSX.
D/CX dia ny data/command control pin amin'ny chip. Rehefa manoratra baiko amin'ny ambaratonga ambany ny DCX, dia soratana amin'ny ambaratonga ambony ny data

SCL is the SPI bus clock, with each rising edge transmitting 1 bit of data.
SDA no angon-drakitra ampitain'ny SPI, izay mamindra angona 8 bit indray mandeha. Ny endrika data dia aseho amin'ny sary manaraka:

Bitika avo aloha, ampita aloha.
Ho an'ny fifandraisana SPI, ny angon-drakitra dia manana fotoana fandefasana, miaraka amin'ny fitambaran'ny famantaranandro tena misy (CPHA) sy ny polarity famantaranandro (CPOL):
Ny haavon'ny CPOL dia mamaritra ny haavon'ny fanjakana tsy miasa amin'ny famantaranandro synchronous serial, miaraka amin'ny CPOL=0, izay manondro ambaratonga ambany. Protocol fifindran'ny mpivady CPOL
The discussion did not have much influence.
Ny haavon'ny CPHA dia mamaritra raha manangona angon-drakitra amin'ny sisiny mitsambikina famantaranandro voalohany na faharoa ny famantaranandro synchronous serial,
Rehefa CPHL=0, manaova fanangonana angon-drakitra amin'ny sisin'ny tetezamita voalohany;
Ny fitambaran'ireo endrika roa ireo dia fomba fifandraisana SPI efatra, ary ny SPI0 dia matetika ampiasaina any Shina, izay misy CPHL=0 sy 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.

MicroSD Card Slot

Mampiasa fomba fifandraisana SPI sy fifandraisana ESP32, fanohanana ny karatra MicroSD amin'ny fahafaha-manao isan-karazany.

RGB Three color Light

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

Serial Port

Ny maody seranan-tsambo ivelany ivelany dia ampiasaina amin'ny serasera seranan-tsambo.

USB to Serial Port and One-click Download Circuit

Ny fitaovana fototra dia CH340C, ny tendrony iray dia mifandray amin'ny solosaina USB, ny iray dia mifandray amin'ny seranan-tsambo ESP32 serial, mba hahazoana USB mankany amin'ny seranan-tsambo TTL.
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.

Batterie Interface

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.

BOOT Key

Rehefa alefa ny maody fampisehoana dia hampidina ny IO0 ny fanerena. Raha vantany vao alefa ny module na averina ny ESP32, ny fampidinana ny IO0 dia hiditra amin'ny fomba fampidinana. Ny tranga hafa dia azo ampiasaina ho bokotra mahazatra.

Type-C Interface

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 hatramin'ny 3.3V Voltage Circuit régulator

The core device is the ME6217C33M5G LDO regulator.

Ny voltage regulator circuit supports 2A V~6.5V wide voltage input, a 3.3V stable voltage output, ary ny ambony indrindra Output ankehitriny dia 800mA, izay afaka hihaona tanteraka ny voltage sy ny fepetra takiana amin'izao fotoana izao amin'ny maodely fampisehoana.

RESET Key

Aorian'ny famelomana ny maody fampisehoana, ny fanindriana dia hisintona ny pin reset ESP32 midina (misintona ny toerana misy azy), mba hahatratrarana ny asa famerenana.

Circuit fanaraha-maso ecran resistive

Ny fitaovana fototra dia XPT2046, izay mifandray amin'ny ESP32 amin'ny SPI.
Ity fizaran-tany ity no tetezana eo amin'ny efijery fikasihana resistive sy ny tompon'ny ESP32, tompon'andraikitra amin'ny fampitana ny angon-drakitra eo amin'ny efijery fikasihana mankany amin'ny master ESP32, mba hahazoana ny fandrindrana ny teboka.

Hanitatra ny Pin

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

Circuit fanaraha-maso 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.

Interface amin'ny mpandahateny

Ny terminal wiring dia tsy maintsy mifandray mitsangana. Ampiasaina hidirana amin'ny fanamafisam-peo mono sy fanamafisam-peo.

Herim-peo ampCircuit de lifier

Ny fitaovana fototra dia ny feo FM8002E ampLifer IC.
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 peripheral interface tsara

4-tariby marindrano interface tsara. Mitadiava pin fantina chip tsy ampiasaina sy pin interface tsara SPI ampiasain'ny karatra MicroSD, izay azo ampiasaina amin'ny fitaovana SPI ivelany na seranan-tsambo IO mahazatra.

Detailed explanation of the schematic diagram of the display module

Type C interface circuit

Amin'ity faritra ity, ny D1 dia ny diode Schottky, izay ampiasaina mba hisorohana ny fihodinan'ny ankehitriny. D2 ka hatramin'ny D4 dia electrostatic surge diodes fiarovana mba hisorohana ny fampisehoana Module tsy ho simba noho ny vol be loatratage 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 hatramin'ny 3.3V voltagny circuit regulator

Ao amin'io faritra io, C16 ~ C19 no bypass sivana capacitor, izay ampiasaina mba hihazonana ny fahamarinan-toerana ny fampidirana vol.tage sy ny output voltage. 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 voltagIlaina ny fiovam-po regulator.

Resistive touchscreen fanaraha-maso circuit

Amin'ity faritra ity, C25 sy C27 dia capacitors sivana bypass, izay ampiasaina amin'ny fitazonana ny input voltage 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

Amin'ity faritra ity, U3 dia CH340C USB-to-serial IC, izay tsy mila oscillator kristaly ivelany mba hanamora ny famolavolana faritra. C6 dia capacitor sivana bypass ampiasaina hitazonana ny vol inputtage 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. Ny tsipika RST sy DTR an'ny CH340C dia mamoaka avo lenta amin'ny alàlan'ny default. Amin'izao fotoana izao, ny triode Q1 sy Q2 dia tsy mandeha, ary ny IO0 tsimatra sy ny reset tsimatra ny ESP32 fanaraha-maso lehibe dia nisintona ho ambony.
B. Ny tsimatra RST sy DTR an'ny CH340C dia mamoaka ambaratonga ambany, amin'izao fotoana izao, ny triode Q1 sy Q2 dia mbola tsy mandeha, ary ny tsimatra IO0 sy ny reset amin'ny fanaraha-maso lehibe ESP32 dia mbola voasintona ho any amin'ny ambaratonga ambony.
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. Ny pin RST an'ny CH340C dia mamoaka avo lenta, ny pin DTR dia mamoaka haavo ambany, amin'izao fotoana izao ny Q1 dia mandeha, ny Q2 dia tsy mandeha, ny reset pin amin'ny fanaraha-maso lehibe ESP32 dia tsy ho lasa avo avy hatrany satria ny capacitor mifandray dia voampanga, ESP32 dia mbola ao amin'ny fanjakana reset, ary ny IO0 pin dia midina avy hatrany, amin'izao fotoana izao dia hiditra ny fomba Download.

Herim-peo ampCircuit de lifier

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 ampLifer. Rehefa tsy miova ny sandan'ny fanoherana ny R13, ny kely kokoa ny sandan'ny fanoherana ny R10, ny lehibe kokoa ny haben'ny mpandahateny ivelany. C10 sy C11 dia capacitors fampifandraisana. R11 dia ny fisintonana resistor. JP1 no seranan-tandroka/mpiteny. Ny U5 dia ny herin'ny feo FM8002E ampLifer IC. Aorian'ny fampidirana an'i AUDIO_IN, ny mari-pamantarana DAC audio dia 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

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.

Famaritana fametahana fanalahidy

Amin'ity faritra ity, KEY1 no lakile, R4 no mpitari-tafika, ary C3 no capacitor fanemorana. Reset fitsipika:

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. Rehefa voampanga ny C3 dia mitovy amin'ny faritra misokatra ny C3, alaina ny PIN RESET, vita ny famerenana ny ESP32, ary miditra amin'ny fanjakana miasa ara-dalàna ny ESP32.

C. Rehefa tsindriana ny KEY1, dia miorim-paka ny PIN RESET, miditra amin'ny toetry ny famerenana ny ESP32, ary ny C3 dia alefa amin'ny KEY1.
D. Rehefa navoaka ny KEY1 dia voampanga ny C3. Amin'izao fotoana izao, ny C3 dia mitovy amin'ny circuit fohy, ny PIN RESET dia miorina, ny ESP32 dia mbola ao amin'ny fanjakana RESET. Aorian'ny fiampangana C3 dia alaina ny pin reset, averina ny ESP32 ary miditra amin'ny fanjakana miasa mahazatra.

Raha toa ka tsy mahomby ny RESET, dia azo ampitomboina araka ny tokony ho izy ny sandan'ny fandeferana C3 hanemorana ny fe-potoana ambany.

Interface circuit of the serial module

Ao amin'ity faritra ity, P2 dia seza 4P 1.25mm pitch, R29 sy R30 dia fanoherana fifandanjana impedance, ary Q5 dia fantsom-baravarankely mifehy ny famatsiana herinaratra 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

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.

Circuit de charge sy decharge batterie

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 dia 5V, avy eo ny vavahady Q3 dia 5V avo, tapaka ny tatatra sy loharano, ary tapaka ny famatsiana bateria.

1 8P LCD panel wire welding interface

Amin'ity faritra ity, C24 no capacitor sivana bypass, ary QD1 no 48P 0.8mm pitch ranon-javatra kristaly welding interface tsara. Ny QD1 dia manana tsipìka famantarana famantarana efijery fikasihana fanoherana, efijery LCD voltage Pin, SPI fifandraisana Pin, fanaraha-maso Pin sy backlight circuit Pin. Ny ESP32 dia mampiasa ireo tsimatra ireo mba hifehezana ny LCD sy ny efijery fikasihana.

Download the key circuit

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.

Circuit de detection ny herin'ny batterie

Amin'ity faritra ity, R2 sy R3 dia ampahany voltage resistors, ary C1 sy C2 dia bypass sivana capacitors. Ny bateria voltage BAT+ famantarana famantarana mandalo amin'ny divider resistor. BAT_ADC no voltage 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 voltagsanda e. Ny voltage divider no ampiasaina satria ny ESP32 ADC dia mamadika 3.3V ambony indrindra, raha ny voly saturation bateria.tage dia 4.2V, izay tsy lavitra. Ny voltage ampitomboina 2 no tena vol bateriatage.

LCD backlight fanaraha-maso circuit

Amin'ity faritra ity, ny R24 dia ny fanoherana ny debugging ary voatazona vonjimaika. Q4 dia ny fantsona N-fantsona an-tsaha vokany, R25 no Q4 grid pull-midina resistor, ary R26 no backlight mametra resistor. Ny LED backlight LCD lamp dia ao amin'ny fanjakana parallèle, ny tsato-kazo tsara dia mifandray amin'ny 3.3V, ary ny ratsy tsato-kazo mifandray amin'ny tatatra ny Q4. Rehefa ny pin control LCD_BL dia mamoaka 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 dia alefa ary mamoaka hazavana.
When the control pin LCD_BL outputs a low voltage, ny tatatra sy ny loharanon'ny Q4 dia tapaka, ary ny ratsy backlight ny LCD efijery mihantona, ary ny backlight LED lamp tsy alefa. Amin'ny alàlan'ny default dia maty ny jiro LCD.

Ny fampihenana ny fanoherana R26 dia mety hampitombo ny famirapiratry ny hazavana ambony indrindra.
In addition, the LCD_BL pin can input a PWM signal to adjust the LCD backlight.

RGB telo loko fanaraha-maso ny jiro

Amin'ity faritra ity, LED2 dia RGB telo loko lamp, ary R14~R16 dia telo loko lamp 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.

MicroSD karatra slot interface tsara circuit

Amin'ity faritra ity, SD_CARD1 no slot karatra MicroSD. R17 ka hatramin'ny R21 dia misintona resistors ho an'ny pin tsirairay. C26 no capacitor sivana bypass. Ity circuit interface ity dia mampiasa fomba fifandraisana SPI. Manohana fitahirizana karatra MicroSD haingam-pandeha.
Mariho fa ity interface ity dia mizara ny SPI bus amin'ny SPI periferika interface.

Tandremo amin'ny fampiasana ny Module fampisehoana

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.

Mandritra ny fampiasana dia aza mikasika ny LDO voltage regulator sy IC fitantanana ny batterie amin'ny tananao mba tsy ho may amin'ny hafanana ambony.
Rehefa mampifandray ny seranan-tsambo IO dia tandremo tsara ny fampiasana IO mba hisorohana ny tsy fifankahazoana ary tsy mifanaraka ny famaritana ny kaody fandaharana.
Ampiasao ny vokatra azo antoka sy ara-drariny.

FAQ

F: Ahoana no hidirana amin'ny sample programa sy tranomboky rindrambaiko?
- A: Ny sample programs and libraries can be found in the 1-_Demo directory of the resource description.
F: Inona no fitaovana tafiditra ao amin'ny rindrambaiko fitaovana?
- 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.

Documents / Loharano

LCD wiki E32R28T 2.8 mirefy ESP32-32E Display Module [pdf] Boky Torolàlana
E32R28T, E32N28T, E32R28T 2.8 inch ESP32-32E Display Module, E32R28T, 2.8inch ESP32-32E Display Module, ESP32-32E Display Module, Display Module, Module

References

User Manual

LCD wiki E32R28T 2.8 mirefy ESP32-32E Display Module

fepetra arahana

Product Information

Torolàlana momba ny fampiasana vokatra