Product Picture

E32R28T-TopView
E32R28T-BottomView

E32N28T-TopView
E32N28T--BottomView

Product Description

Comes with ESP32-WROOM-32E module, easy development, sufficient development resources
3.5-inch color screen, 320x480 resolution 65K color, display color rich
Rich interface, easy to connect a variety of peripherals (I2C, SPI, UART,etc.)
Supports external speakers to play audio
Comes with RGB three-color indicator, indicating rich status
Comes with resistive touch screen, easy man-machine interaction
Standard TYPE-C interface for easy program download and power supply
Equipped with micro TF card slot for easy storage expansion
Support external lithium battery, lightweight and portable
Equipped with battery charging management circuit to ensure safe battery charging and discharging
Provide rich example learning programs, easy to learn
Provide low-level driver technical support, and update WIKI information online
Multiple tests for module aging can meet military level standards, supporting long-term stable work

Product Parameters

ESP32 Parameters

Name	Parameter
Module	ESP32-WROOM-32E
CPU	ESP32-D0WD-V3,Xtensa dual-core 32-bit LX6 microprocessor
Frequency	240MHz(Max)
Memory	48KB ROM+520KB SRAM+16KB RTC SRAM+4MB external QSPI Flash
WIFI	2.4GHz and 802.11b/g/n modes
Bluetooth	Bluetooth V4.2BR /EDR and Bluetooth LE standards
Operating Voltage	3.0~3.6(V)
Operating Temperature	–40~85(℃)

LCD Parameters

Name	Parameter
Panel Size	3.5 inch
Panel Type	TN TFT
Resolution	320xRGBx480(pixels)
Active Area	48.96(W)x73.44(H)(mm)
Number of Colors(Max)	16.7M
Driver IC	ST7796U
Display Interface	4-Line SPI(Connect to ESP32)
Pixel Size	0.153(H)x0.153(mm)
View Angle	12 0’CLOCK
Brightness(TYP)	300 cd/m²
Backlight Type	White LED*6
Operation Temperature	-10~50(℃)
Storage Temperature	-20~60(℃)

Touch Screen Parameters

Name	Parameter
Touch Active Area	3.5 inch
Touch Screen Type	Resistive touch screen
Touch Screen Resolution	320x480(pixels)
Driver IC	XPT2046
Touch Screen Visual Area	49.50(W)x77.24(H)(mm)
Communication Interface	SPI
Material	ITO film +ITO glass
Operation Temperature	-10~60(℃)
Storage Temperature	-20~70(℃)

Size Parameters

Name	Parameter
LCD Outline Size	55.50±0.2(W)x84.96±0.2(H)x2.5±0.1(D)(mm)(Excluding cables and adhesive backing)
Touch Screen Outline Size	55.0±0.2(W)x84.36±0.2(H)x1.20 (D)(mm)(Excluding cables and adhesive backing)
Module Outline Size	Have Touch Screen: 55.50(W)x101.50(H)x5.80(D)(mm) Have no Touch Screen: 55.50(W)x101.50(H)x4.60(D)(mm)

Battery Charging Parameters

Name	Parameter
Charging Voltage	Range: 4.2 to 6.5 Typical value: 5
Charging Current	Max: 500 Module Actual value: 290
Charging Saturation Voltage	4.24V
Charging Temperature	Module maximum value:62℃
Rechargeable Battery Specifications	3.7V polymer lithium battery

Electrical Parameters

Name	Parameter
Working Voltage	5.0V
Backlight Current	104mA
Total Current	ESP32 reset: 40 Only the display works: 160 Display, speaker, battery charging all work: 510
Power	0.8W(Display only works)

Basic Parameters

Name	Parameter
SKU	Have Touch Sreen: E32R35T Have no Touch Screen: E32N35T
Power Supply Interface	TYPE-C
Weight(including package)	E32R35T: 90g E32N35T: 80g

Interface Definition

Interface Function Description

Interface Name	Function Description
ESP32-WROOM-32E Module	Display module main control,control board peripheral and external peripheral.
MicroSD card slot	A MicroSD card is inserted to expand the storage space for storing large data such as characters, pictures, and audio files.
RGB LED	Contains red, green, blue three colors of LED lights, each light can be controlled by IO, used to indicate the status.
Serial port	1.25mm 4P connector.It can be used for serial debugging, downloading, and communication. An external USB to serial port module is required.
Battery Interface	1.25mm 2P connector.Used to connect 3.7V polymer lithium battery, charge the battery through the battery charge management circuit, can also be used for battery power supply. Note the positive and negative terminals of the interface.
BOOT Key	Used to enter download mode or key test. Press and hold this button to power on and release it to enter the download mode. Alternatively, press and hold this button and then press the RESET button to release the RESET button and then release this button to enter the download mode. When you do not need to enter the download mode, this button can be used as a common button.
Type-C Interface	Used for module power supply and download programs. This interface is connected to the one-click download circuit on the module, which can automatically enter the download mode (without pressing the BOOT key).
RESET Key	Used for ESP32 master control and LCD reset, level reset after pressing.
Expand the input pin	1.25mm 2P connector. IO35 and IO39 are two input-only IOs that are used to access input signals.
Speaker Interface	1.25mm 2P connector. Used to access the speaker to play audio.
SPI peripheral interface	1.25mm 4P connector. For external connection to devices that use IIC communication. It can be used as ordinary IO.
I2C peripheral interface	1.25mm 4P connector. For external connection to devices that use IIC communication. It can be used as ordinary IO.

ESP32 Pin Assignment

Onboard Equipment	ESP32 Connect Pins	Pin Description of Onboard Equipment
LCD	IO15	LCD screen selection control signal, low level effective
	IO2	LCD command/data selection control signal High Level:data,low Level:command
	IO14	SPI bus clock signal(shared by LCD and touch screen)
	IO13	SPI bus write data signal(shared by LCD and touch screen)
	IO12	SPI bus read data signal(shared by LCD and touch screen)
	EN	LCD reset control signal, low level reset(share reset pin with ESP32-32E master)
	IO27	LCD backlight control signal(high level backlight on, low level backlight off)
Resistive Touch Screen	IO14	SPI bus clock signal(shared by touch screen and LCD)
	IO13	SPI bus write data signal(touch screen and LCD screen shared)
	IO12	SPI bus read data signal(shared by touch screen and LCD screen)
	IO33	Resistive touch screen chip selection control signal,low level effective
	IO36	Resistive touch screen touch interrupt signal,generates touch when input low level to master
RGB Three-color Light	IO22	Red LED light(common anode, low level on, high level off)
	IO16	Green LED light(common anode, low level on, high level off)
	IO17	Blue LED light(common anode, low level on, high level off)
MicroSD 卡	IO5	SD card select signal,low level effective
	IO23	SD card SPI bus write data signal(shared by MicroSD card and SPI peripheral)
	IO18	SD card SPI bus clock signal(shared by MicroSD card and SPI peripheral)
	IO19	SD card SPI bus read data signal(shared by MicroSD card and SPI peripheral)
Audio	IO4	Audio enable signal,low level enable,high level disable
Audio	IO26	Audio signal DAC output signal
KEY	IO0	Download mode Select button(Press and hold the button to power on, then release to enter download mode)
KEY	EN	ESP32-23E reset button, low level reset(shared with LCD reset)
Serial Port	RXD0(IO3)	ESP32-32E serial port receiving signal(if the serial port is not used, it can be used as ordinary IO)
Serial Port	TXD0(IO1)	ESP32-32E serial port sends signals(if the serial port is not used, it can be used as ordinary IO)
Battery	IO34	Battery voltage ADC value Get Signal (input)
SPI Peripheral	IO21	SPI peripheral chip selection signal, low level effective(if the SPI device is not used, it can be used for ordinary IO)
	IO18	SPI bus clock pin for SPI peripherals (SPI peripherals are shared with MicroSD cards, if SPI devices or SD cards are not used, ordinary IO can be used)
	IO19	The SPI bus read data pin of the SPI peripheral (SPI peripherals are shared with MicroSD cards, if SPI devices or SD cards are not used, ordinary IO can be used)
	IO23	The SPI bus of the SPI peripheral writes data pins (SPI peripherals are shared with MicroSD cards, if SPI devices or SD cards are not used, ordinary IO can be used)
I2C Peripheral	IO25	I2C bus clock pin for I2C peripherals (can be used as normal IO if I2C device is not used)
I2C Peripheral	IO32	I2C bus data pins for I2C peripherals (can be used for ordinary IO if I2C devices are not used)
NC	IO35	It can only be used as input IO
NC	IO39	It can only be used as input IO