UHF_Reader_ESP-32_Software

This github page provides a getting started guide and other working details for the UHF reader for ESP32. The UHF Reader for ESP32 is a rapid multi-tag reading device for efficient and effective inventory management.

Features:

• UHF Reader for ESP32 is powered by ESP32 S3 WROOM - 1
• Onboard High-performance UHF RFID reader module
• Both read and write operations
• 24 hours x 365 days’ work normally
• 1.14” TFT display for visual interaction
• Multi-tone Buzzer onboard for Audio alerts
• Type C interface for programming and power
• Onboard 2 user programmable buttons, Boot and Reset button
• SD card slot for storage and data transfer
• Battery power and charging circuit for portable use
• Status LED for Power and Battery charging available
• Multipurpose GPIOs breakout for interfacing external peripherals
• Arduino and Espressif IDF platform support for programming.

Specifications:

• ESP32-S3 series of SoCs having Xtensa® dual-core 32-bit LX7 microprocessor, 2.4 GHz Wi-Fi (802.11 b/g/n) and Bluetooth® 5 (LE), Flash up to 16 MB, PSRAM up to 8 MB
• Operating voltage of pins 3.3V and board supply 5V
• Display resolution 240 × 135 pixels
• ST7789 display driver
• UHF Module:
  • UHF Frequency Range : EU/UK -> 865.1-867.9 MHz, US-> 902.25-927.75 MHz
  • UHF module type : Read and Write
  • Protocols Supported : EPCglobal UHF Class 1 Gen 2 / ISO 18000-6C
  • Onboard Integrated Antenna (having Circular polarity)
  • Reading Distance: 1-1.5 meters depending tags
  • Can identify over 50 tags simultaneously
  • Communication interface: TTL UART Interface for UHF
  • Communication baud rate: 115200 bps（default and recommend) - 38400bps
  • Operation current: 180mA @ 3.5V (26 dBm Output，25°C), 110mA @ 3.5V (18 dBm Output，25°C)
  • Working humidity < 95% (+ 25 °C)
  • Heat-dissipating method Air cooling(no need out install cooling fin）
  • Tags storage capacity: 200pcs tags @ 96 bit EPC
  • Output power: 18-26 dBm
  • Output power accuracy: +/- 1dB
  • Tags RSSI: support

Getting Started with UHF Reader for ESP32

Hardware Overview

Pinout

• (1) 1.14” Display
• (2) UHF module
• (3) Type C
• (4) & (6) programmable button
• (5) & (10) GPIOs Breakout with Power Pins
• (7) Buzzer
• (8) ESP32 S3 Wroom -1
• (9) Boot Button
• (11) Reset Button
• (12) Battery Connector
• (13) TF card slot

Interfacing Details

• ESP32 and UHF module interfacing

  ESP32	UHF Module Pin	Function
  IO17 (U1TXD)	RX	Serial UART connection
  IO18 (U1RXD)	TX	Serial UART connection
  IO21	UHF_EN	UHF Reader enable pin, LOW to activate and HIGH to deactivate

• ESP32 and Display interfacing

  ESP32	Display Pin	Function
  IO12	SCLK	Clock pin of SPI interface for display
  IO11	DIN	MOSI (Master OUT Slave IN) data pin of SPI interface
  IO13	DC	Data/Command pin of SPI interface
  IO10	CS	Chip Select pin of SPI interface for display
  IO14	RST	Display Reset Pin
  IO9	BL	Backlight of Display

• ESP32 and micro SD card interfacing

  ESP32	microSD Card	Function
  IO42	SCLK	Clock pin of SPI interface for microSD card
  IO2	DIN	MOSI (Master OUT Slave IN) data pin of SPI interface
  IO41	DOUT	MISO (Master IN Slave OUT) data pin of SPI interface
  IO1	CS	Chip Select pin of SPI interface for SDcard

• Buttons and Buzzer Interfacing with ESP32

  ESP32	Buttons	Function
  IO5	BT1	programmable button
  IO4	BT2	programmable button
  IO0	BOOT	BOOT button
  IO8	Buzzer	Buzzer positive

• GPIOs Breakout 1

  ESP32	Physical Pin	Multi-Function
  5V	-	Positive 5V supply
  IO3	15	RTC_GPIO3, GPIO3, TOUCH3, ADC1_CH2
  IO7	7	RTC_GPIO7, GPIO7, TOUCH7, ADC1_CH6
  IO16	9	RTC_GPIO16, GPIO16, U0CTS, ADC2_CH5, XTAL_32K_N
  IO15	8	RTC_GPIO15, GPIO15, U0RTS, ADC2_CH4, XTAL_32K_P
  GND	-	Supply ground pin

• GPIOs Breakout 2

  ESP32	Physical Pin	Multi-Function
  3.3V	-	Positive 3.3V supply
  IO38	31	GPIO38, FSPIWP, SUBSPIWP
  IO39	32	MTCK, GPIO39, CLK_OUT3, SUBSPICS1
  IO46	16	GPIO46
  IO40	33	MTDO, GPIO40, CLK_OUT2
  GND	-	Supply ground pin

1. Configure and Setup Development Environment

• Download Arduino IDE from official site and install into your system. We have use Arduino IDE 1.8.19

• Once installation done will add ESP32 S3 board support into IDE, for this first you need to add below link into preference: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json

  Select File > Preference, and add link as show in below image,

• Now will install ESP32 based boards as shown in below image,

  

• Once done, keeping default settings select the ESP32S3 Dev Module with suitable com port (may be different in your case) as shown below,

  

• In case you don't see com port then you will have to install CP2102 driver from Link. Download and install as per your operating system.

  • check below one recommended for windows user

    

  • Once successfully installed then it appears as shown in below image

    

2. Testing First Code

• At this step you are all set to test codes, for easy getting started we have provided various demo example codes in github which you can download and try.

• Open one example code in Arduino and make sure you have selected correct board with suitable com port, click on upload button to transfer code on ESP32 of UHF reader Board.

• Checkout other examples below and build your own custom program codes using those references.

3. Installing Libraries

• Download library zip file provided here in github.

• Extract and copy files inside Document > Arduino > Libraries folder. Make sure to restart Arduino IDE whenever you update or add any libraries.

  

Commands and Response of UHF module

Type	Description
0x00	Command Frame: send from PC/Controller to UHF Module chip
0x01	Response Frame: send from UHF Module chip to PC/Controller
0x02	Notice Frame: send from UHF Module chip to PC/Controller

• Hardware version Check

  

  Expected Response

  

  code snippets(header file)

  // Add here UHF commands in byte array format to configure, 
  // refer Manual: https://github.com/sbcshop/UHF_Reader_ESP-32_Software/blob/main/documents/UHF%20Commands%20Manual.pdf
  static byte HARDWARE_VERSION[]    = {0XBB,0X00,0X03,0X00,0X01,0X00,0X04,0X7E};
  static byte MULTIPLE_READ[]   = {0XBB, 0X00, 0X27, 0X00, 0X03, 0X22, 0X27, 0X10, 0X83, 0X7E};
  static byte SINGLE_READ[]     = {0XBB,0X00,0X22,0X00,0X00,0X22,0X7E};
  static byte STOP_READ[]       = {0XBB,0X00,0X28,0X00,0X00,0X28,0X7E};
  

  code snippets (main ino file)

  //Uncomment corresponding commands to configure UHF, more command can be added in UHF.h
  #define commands HARDWARE_VERSION
  //#define commands MULTIPLE_READ
  //#define commands SINGLE_READ
  //#define commands STOP_READ
  

  Output on Terminal:

  

• Similarly for Tag read

  

  Required Command:

   static byte SINGLE_READ[]     = {0XBB,0X00,0X22,0X00,0X00,0X22,0X7E};
  

  Output on Terminal:

  

  For more detail refer Manual for various UHF module commands.

Example Codes

In example folder you will find demo examples to try out on UHF reader for ESP32 board, some demo listed below

• Buzzer Demo : code to test onboard Buzzer and Buttons
• Display Demo : testing code for display
• SD card Demo : code to test onboard micro SD card interfacing
• UHF Module Demo : testing onboard UHF module

Using this sample code as a guide, you can modify, build, and share codes!!

Resources

• Schematic
• Hardware Files
• Step File
• Getting Started with ESP32 in Arduino
• ESP32 S3 Hardware Reference
• ESP32 S3 WROOM 1 Datasheet
• Arduino IDE 1 overview

Related Products

• UHF Reader for Pico W - UHF Reader powered by RPi Pico W
• Ardi UHF Shield - UHF based shield with Oled display and Buzzer onboard
• UHF Lite HAT - Raspberry Pi Version
• UHF Lite Expansion for Raspberry Pi Pico: UHF Lite Expansion to use with Pico/ Pico W

Product License

This is open source product. Kindly check LICENSE.md file for more information.

Please contact support@sb-components.co.uk for technical support.