Besides, the stamp hole design makes it able to be easily embedded in your PCB, greatly saving your costs and time to build and test prototype. In this lesson, we'll learn about the principle of serial communication. ESP-Jumpstart is focused on buildingproductson ESP32. Red LED for indicating charging status: 1. This document provides the specifications of the ESP8684 chip. Return value: a boolean value, true if the creation is successful, false if the creation fails. FireBeetle ESP32-E IoT Microcontroller (Wi-Fi / Bluetooth) This document provides information on ESP32-C6-DevKitC-1 development board. Beetle ESP32 is a simplified version of FireBeetle-ESP32. All rights reserved. function: the callback function for the external interrupt; Disable pin interrupt detchInterrupt(pin), no value is returned. In the schematics of the FireBeetle 2, there is a built-in RGB led on the board: This RGB led is connected to the ESP32 pin IO5 (IO5/D8). If that doesn't work, try replacing the board link from. This document introduces a downloading protocol for ESP8266 firmware. Had a successful integration of a HiLetGo ESP8266 module to monitor my alarm panel and inform Home Assistant. Beetle_ESP32_SKU_DFR0575-DFRobot Next, we'll learn how to light up the RGB LED without external hardware connections. According to the FB schematic, the LDO cuts out at 0.31V, so that means 3.61v. This guide mainly describes the production testing schemes available for Espressif Wi-Fi products (Wi-Fi module/Chip Onboard), thus providing reference for the production testing of customer products. The two DACs can be used as reference voltage. This document provides ESP8266 Wi-Fi channel selection guidelines. buf: a character array or byte data. The USB-related circuit design is shown below: FireBeetle 2 ESP32-E has two 8-bit DAC channel that converts 2-way digital signal to 2 analog voltage outputs. After that, connect your FireBeetle 2 ESP32-E to your computer. This document introduces the specifications of ESP8685-WROOM-01 hardware, including overview, pin definitions, functional description, peripherals, and electrical characteristics, etc. Add a new anti-reverse connection silk-screen. Looking at the schematic, I . This document introduces the flash encryption feature of ESP32. Program: Use one FireBeetle 2 ESP32-E as the host and the other as the slave to establish a Bluetooth wireless communication, where the host sends data to the slave. This is the documentation for esp-dev-kits. DFR0225 Romeo V2-All in one Controller R3, DFR0100 DFRduino Beginner Kit For Arduino V3, DFR0428 3.5 inches TFT Touchscreen for Raspberry Pi, DFR0478 FireBeetle ESP32 IOT Microcontroller(V3.0), DFR0483 FireBeetle Covers-Gravity I O Expansion Shield, DFR0143 Triple Axis Accelerometer MMA7361, DFR0489 FireBeetle ESP8266 IOT Microcontroller, DFR0492 FireBeetle Board-328P with BLE4.1, DFR0498 FireBeetle Covers-Camera&Audio Media Board, DFR0507 FireBeetle Covers-OLED12864 Display, DFR0508 FireBeetle Covers-DC Motor & Stepper Driver, DFR0023 DFRobot LM35 Linear Temperature Sensor, DFR0511 FireBeetle Covers-ePaper Black&White Display Module, DFR0514 DFR0603 IIC 16X2 RGB LCD KeyPad HAT V1.0, DFR0524 5.5 HDMI OLED-Display with Capacitive Touchscreen V2.0, DFR0531 FireBeetle Covers-ePaper Black&White&Red Display Module, DFR0536 Micro bit Gamepad Expansion Board, DFR0550 5'' TFT-Display with Touchscreen V1.0, DFR0566 IO Expansion HAT for Raspberry Pi, DFR0024 Gravity DS18B20 Temperature Sensor V2, DFR0591 raspberry pi e-ink display module V1.0, DFR0604 I O Expansion HAT for Pi zero V1.0, DFR0024 Gravity DS18B20 Temperature Sensor V2, DFR0558 Gravity Digital High Temperature Sensor K-type, TEL0110 CurieCore intel Curie Neuron Module, TEL0121 FireBeetle Covers-LoRa Radio 433MHz, TEL0122 FireBeetle Covers-LoRa Radio 915MHz, TEL0125 FireBeetle Covers LoRa Radio 868MHz, ROB0150 Micro bit Circular RGB LED Expansion Board, SEN0072 CMPS09 - Tilt Compensated Magnetic Compass, SEN0032 Triple Axis Accelerometer Breakout - ADXL345, SEN0219 Gravity Infrared CO2 Sensor For Arduino, SEN0224 Gravity I2C Triple Axis Accelerometer - LIS2DH, SEN0226 Gravity I2C BMP280 Barometer Sensor, DFR0067 DHT11 Temperature and Humidity Sensor, DFR0066 SHT1x Humidity and Temperature Sensor, SEN0250 Gravity BMI160 6-Axis Inertial Motion Sensor, SEN0251 Gravity BMP280 Barometric Pressure Sensors, SEN0253 Gravity BNO055 + BMP280 intelligent 10DOF AHRS, Triple Axis Accelerometer FXLN83XX Series, SEN0137 DHT22 Temperature and humidity module, SEN0227 SHT20 I2C Temperature & Humidity Sensor Waterproof Probe, SEN0246 URM08-RS485 Waterproof Sonar Range Finder, SEN0304 URM09 Ultrasonic Sensor (Gravity-I2C) (V1.0), SEN0300 Water-proof Ultrasonic Sensor ULS, SEN0301 Water-proof Ultrasonic Sensor ULA, SEN0307 URM09 Ultrasonic Sensor Gravity Analog, SEN0311 A02YYUW Waterproof Ultrasonic Sensor, SEN0312 ME007YS Waterproof Ultrasonic Sensor, SEN0313 A01NYUB Waterproof Ultrasonic Sensor, TOY0054 SI7021 Temperature and humidity sensor, SEN0236 Gravity I2C BME280 Environmental Sensor Temperature, Humidity, Barometer, SEN0248 Gravity I2C BME680 Environmental Sensor VOC, Temperature, Humidity, Barometer, SEN0308 Waterproof Capacitive Soil Moisture Sensor, SEN0019 Adjustable Infrared Sensor Switch, SEN0143 SHARP GP2Y0A41SK0F IR ranger sensor 4-30cm, SEN0013 Sharp GP2Y0A02YK IR ranger sensor 150cm, SEN0014 Sharp GP2Y0A21 Distance Sensor 10-80cm, SEN0085 Sharp GP2Y0A710K Distance Sensor 100-550cm, DFR0300-H Gravity: Analog Electrical Conductivity Sensor(K=10), DFR0300 Gravity Analog Electrical Conductivity Sensor Meter V2 K=1, SEN0161-V2 Gravity Analog pH Sensor Meter Kit V2, SEN0237 Gravity Analog Dissolved Oxygen Sensor, SEN0204 Non-contact Liquid Level Sensor XKC-Y25-T12V, SEN0244 Gravity Analog TDS Sensor Meter For Arduino, SEN0249 Gravity Analog Spear Tip pH Sensor Meter Kit For Soil And Food Applications, SEN0228 Gravity I2C VEML7700 Ambient Light Sensor, SEN0017 Line Tracking Sensor for Arduino V4, SEN0212 TCS34725 I2C Color Sensor For Arduino, SEN0245 Gravity VL53L0X ToF Laser Range Finder, SEN0259 TF Mini LiDAR ToF Laser Range Sensor, SEN0262 Gravity Analog Current to Voltage Converter (4~20mA), DFR0027 DFRobot Digital Vibration Sensor V2, SEN0038 Wheel Encoders for DFRobot 3PA and 4WD Rovers, DFR0052 Analog Piezo Disk Vibration Sensor, SEN0170 Wind Speed Sensor Voltage Type 0-5V, TOY0048 High Accuracy Dual Axis Inclinometer Sensor Arduino Gadgeteer Compatible, SEN0186 Weather Station with Anemometer Wind vane Rain bucket, SEN0230 Incremental Photoelectric Rotary Encoder - 400P R, SEN0232 Gravity Analog Sound Level Meter, SEN0233 Air Quality Monitor PM 2.5, Temperature & Humidity Sensor, DFR0515 FireBeetle Covers-OSD Character Overlay Module, ROB0025 NEW A4WD Mobile Robot with encoder, ROB0124 HCR Mobile Platform with Omni Wheels, ROB0128 Devastator Tank Mobile Platform Metal DC Gear Motor, DFR0265 IO Expansion Shield for Arduino V7, DFR0312 Raspberry Pi GPIO Extension Board, DFR0327 Arduino Shield for Raspberry Pi 2B and 3B, DFR0412 Gravity IO Expansion Shield For DFRduino M0, DFR0502 Gravity IO Expansion & Motor Driver Shield V1.1, DFR0518 Micro Mate- A Mini Expansion Board for micro bit, DFR0578 Gravity I O Expansion Shield for OpenMV Cam M7, DFR0577 Gravity I O Expansion Shield for Pyboard, DFR0626 MCP23017 IIC to 16 digital IO expansion module, DFR0063 I2C TWI LCD1602 Module Gadgeteer Compatible, DFR0154 I2C TWI LCD2004 Module Arduino Gadgeteer Compatible, TOY0005 OLED 2828 color display module .NET Gadgeteer Compatible, DFR0091 3-wire Serial LCD Module Arduino Compatible, DFR0347 2.8 TFT Touch Shield with 4MB Flash for Arduino and mbed, DFR0348 3.5 TFT Touch Shield with 4MB Flash for Arduino and mbed, DFR0387 TELEMATICS 3.5 TFT Touch LCD Shield, DFR0460 64x32 RGB LED Matrix - 4mm Pitch/64x32 Flexible RGB LED Matrix-4mm Pitch/64x32 Flexible RGB LED Matrix-5mm Pitch, DFR0461 Gravity Flexible 8x8 RGB LED Matrix, DFR0462 Gravity Flexible 8x32 RGB LED Matrix, DFR0463 Gravity Flexible 16x16 RGB LED Matrix, DFR0464 Gravity I2C 16x2 Arduino LCD with RGB Backlight Display, DFR0506 7'' HDMI Display with Capacitive Touchscreen, DFR0555\DF0556\DFR0557 Gravity I2C LCD1602 Arduino LCD Display Module, DFR0529 2.2 inches TFT LCD Display V1.0 (SPI Interface), FIT0352 Digital RGB LED Weatherproof Strip 60LED m*3m, DFR0645-G DFR0645-R 4-Digital LED Segment Display Module, SKU DFR0646-G DFR0646-R 8-Digital LED Segment Display Module, TEL0037 Wireless Programming Module For Arduino, TEL0087 USBBLE-LINK Bluno Wireless Programming Adapter, TEL0083-A GPS Receiver for Arduino Model A, DFR0342 W5500 Ethernet with POE Mainboard, TEL0107 WiFiBee-MT7681 Arduino WiFi Wireless Programming, TEL0112 Gravity 315MHZ RF Receiver Module, TEL0113 Gravity UART A6 GSM & GPRS Module, DFR0505 SIM7000C Arduino NB-IoT LTE GPRS Expansion Shield, DFR0057 Sensor Motor Drive Board - Version 2.2, TEL0070 Multi USB RS232 RS485 TTL Converter, SD2403 Real time clock Module SKU TOY0020, DFR0316 MCP3424 18-Bit ADC-4 Channel with Programmable Gain Amplifier, DFR0553 Gravity I2C ADS1115 16-Bit ADC Module Arduino & Raspberry Pi Compatible, DFR0117 Gravity I2C EEPROM Data Storage Module, DFR0503 Embedded Thermal Printer - TTL Serial, DFR0563 Gravity 3.7V Li Battery Fuel Gauge, DFR0576 Gravity Digital 1-to-8 I2C Multiplexer, DFR0399 DC Micro Metal Gear Motor 75 1 w Driver, DRI0021 Veyron 2x25A Brush DC Motor Driver, DRI0039 Quad Motor Driver Shield for Arduino, DRI0044 2x1.2A DC Motor Driver TB6612FNG, DFR0523 Gravity Digital Peristaltic Pump, SER0044 DSS-M15S 270 15KG DF Metal Servo with Analog Feedback, DRI0023 Stepper Motor Shield For Arduino DRV8825, DRI0035 TMC260 Stepper Motor Driver Shield, DFR0564 USB Charger for 7.4V LiPo Battery, DFR0559 Sunflower Solar Power Manager 5V, DFR0580 Solar Power Manager For 12V Lead-Acid Battery, KIT0098 Breadboard Plugin Components Pack, SEN0305 HUSKYLENS AI Machine Vision Sensor, Gravity: Analog Rotation Potentiometer Sensor for Arduino - Rotation 300, 1.54" 240x240 IPS wide viewing angle TFT display, 2.0" 320x240 IPS wide viewing angle TFT display, 2.8" 320x240 IPS TFT resistive touch display, 3.5" 480x320 IPS TFT capacitive touch display, 1.51" OLED Transparent Display with Converter, http://download.dfrobot.top/FireBeetle/package_DFRobot_index.json, Program download and power supply, 4.75V-5.5V compatible. The sample code below will demonstrate how to drive the onboard LED using PWM to display a breathing light effect. Espressif's documentation feedback link is now available.Submit your feedback! Support MCU and Wi-Fi &Bluetooth dual-mode communication. 4. Program function: Burn the routine, use the pin IO4/D12 as a touch button, and return the touch value through the serial monitor. The manual provides detailed and complete information on how to use the ESP32-S2 memory and peripherals. More information could be found on this site https://w. Return value: returns an object corresponding to the opened file. FireBeetle 2 ESP32-E IoT Microcontroller - DFR0654 - DFRobot Close the window. This document introduces the specifications of ESP32-WROOM-32SE hardware, including overview, pin definitions, functional description, peripherals, and electrical characteristics, etc. AP mode: The ESP32 module serves as a hotspot, allowing direct communication between a mobile phone or computer and the module, enabling wireless control within a local area network. So I add some electronic parts on it. This open source board of high-flexibilty could bring you infinite possibilities! The value returned decreases as the intensity of touch on pin IO4/D12 increases, with a value of 65 indicating no touch. 1.Click to download microPython firmware. The led is a WS2812. IFTTT aims to help people use the open API of various websites to monitor the triggers set by users. FireBeetle 2 ESP32-E, specially designed for IoT, is an ESP-WROOM-32E-based main controller board with dual-core chips.. Solar Weather Station Using ESP32, {if(miniCur.show){miniCur.show = false}else{miniCur.show = true}}"> The default configured pins can be seen in the pinout diagram. This document introduces the specifications of ESP32-C3-MINI-1 and ESP32-C3-MINI-1U hardware, including overview, pin definitions, functional description, peripherals, and electrical characteristics, etc. For the new ESP8266_RTOS_SDK (ESP-IDF style) V3.0 and later versions, please see ESP8266_RTOS_SDK/docs. No matter you are a student, an electronic enthusiast, an artist or a designer, this would be your best partner to open up the world of electronic without dealing with complicated circuits, brain-buring codings, and all complex communication protocols. Note: FireBeetle 2 and FireBeetle pins and sizes are not compatible, and neither are the expansion boards. This document introduces the specifications of ESP32-MINI-1& ESP32-MINI-1Uhardware, including overview, pin definitions, functional description, and electrical characteristics, etc. data, the data to be written (can be of type char, byte, int, long, or String). This user guide provides information on ESP32-S2-DevKitM-1(U), an entry-level development board based on ESP32-S2-MINI-1(U) module. This user guide provides information on ESP32-DevKitS(-R), an ESP32-based flashing board produced by Espressif. Processer: Tensilica LX6 dual core processer (One for high speed connection; one for independent programing). This document introduces the specifications of ESP-WROOM-02 hardware, including overview, pin definitions, functional description, peripherals, and electrical characteristics, etc. DFR0478 Datasheet by DFRobot | Digi-Key Electronics Frequency range: 2.4~2.5 GHz. Firebeetle ESP-32E Issue #1429 esphome/feature-requests The FireBeetle ESP32-E supports Arduino programming and will support Scratch graphical programming and MicroPython programming. If triggers are triggered, actions set by users will be executed. This user guide provides information on ESP32-C3-DevKitC-02, an entry-level development board based on ESP32-C3-WROOM-02 module. This ESP32-E IoT microcontroller operates at 3.3V supply voltage. ESP-WHO is a face detection and recognition platform that is currently based on Espressif Systems'ESP32chip. For LEDs, a frequency of 5000 Hz is suitable. 2. ESP32 Firebeetle with E-Paper Display - YouTube Therefore, it is best to use SD.exists(filename) to check if the file exists before removing the file. The demo is the AT command set based on uart. When using SD.begin(), the default is to connect the SS pin of the Arduino SPI to the CS enable selection pin of the SD card. https://download.dfrobot.top/FireBeetle/package_DFRobot_index.json to http://download.dfrobot.top/FireBeetle/package_DFRobot_index.json and reload it. Could you support this device? filename, the name of the folder to remove. Return value: a boolean value, true if the removal is successful, false if the removal fails. FireBeetle-ESP32 . Return value: a boolean value, true if initialization is successful, false if initialization fails. Compatible with products in the DFRobot FireBeetle serials, Project 2. SPI communication is used in many sensors because it offers a faster speed compared to I2C and doesn't have the issue of address conflicts. The main controller supports two power supply methods: USB and 3.7V . Syntax: file.write(data) and file.write(buf, len). FireBeetle 2 ESP32-E, specially designed for IoT, is an ESP-WROOM-32E-based main controller board with dual-core chips. Smart Compost Bin Monitoring System -Based on 4G IoT and SHT20. True if the file is a directory, false if it is not. I've looked at . V shaped gilded I/O interface, can be sewn on clothesdirectly. The dimension of mounting hole: inner diameter 3.1mm; outside diameter 6mm. Function: Drive the onboard LED using PWM to display a breathing light effect. This user guide will help you get started with ESP32-S3-EYE v2.1 and will also provide more in-depth information. This document introduces the hardware specifications of ESP-WROOM-02D and ESP-WROOM-02U. Here an 8-bit resolution is used. Title [DFR0654]FireBeetle ESP32-E(V1.0).PDF Author: Administrator Created Date: 8/19/2021 2:34:10 PM The getting started guide for the ESP32-DevKitC development board. Hope this post from Arduino helps. I think you will find that the FB draws more than 10uA. This is documentation of ESP-ADF, the framework to develop audio applications for ESP32 chip by Espressif. The ESP-EYE development board reference design resources, including schematics, PCB layout, gerber files, and BOM lists. This document introduces the specifications of ESP8285, including pin definitions, functional description, electrical specifications, package information, etc. Function: Establish a BLE server that can provide data and send notifications to clients. Especially when you add a battery. - Return value: The object corresponding to the next file. FireBeetle 2 ESP32-E IoT Microcontroller | The Pi Hut - Return value: A boolean value. Firebeelte ESP32 models include onboard charging circuitry for a 3.7v lithium-ion(LiPo) battery. This documentation helps developers to get started with ESP RainMaker and provides all the related detailed information. This document summarizes the packing requirements of Espressifs chip products, including the packing method, packing-material dimensions, standard packing quantity, labels, dry-packing requirements and marking conventions. Cannot retrieve contributors at this time. Project 1. When the program is uploaded, the on-board LED blinks at a one-second interval repeatedly. The power consumption can be reduced to 13 A after controlling the maincontroller to enter the sleep mode through the program. setCallbacks() Description: Set callbacks for characteristic, setValue() Description: Set the value of the characteristic, getValue() Description: Get the value of the characteristic. This document introduces the specifications of ESP32-S2-WROOM and ESP32-S2-WROOM-I hardware, including an overview, pin definitions, functional description, peripherals, electrical characteristics, etc. Syntax: file.print(data) or file.print(data, BASE). This document introduces the ESP8266 AT commands and explains how to use them and provides examples of several common AT commands. This user guide provides information on ESP32-S2-Saola-1, a small-sized ESP32-S2 based development board produced by Espressif. Program function: the UART serial prints timing data once per second. About how to use the LTR390-UV light sensor, please refer to the LTR390-UV Ultraviolet Light Sensor Wiki. Improvement: Changed the minimum baud rate supported by the CAN module from 25 kHz to 12.5 kHz. Description: Seek to a specified position. Install the Bluetooth helper LightBlue from the app store on the phone and establish a BLE connection with the ESP32-E module. A: Press RST button to reset and try again. I tested this with an 18650 lithium-ion battery and can confirm this is true. ESP32 has Bluetooth functionality, and this example will demonstrate the use of two FireBeetle 2 ESP32-E boards for Bluetooth communication. This document introduces the specifications of ESP32-S2-SOLO & ESP32-S2-SOLO-U hardware, including overview, pin definitions, functional description, peripherals, and electrical characteristics, etc. - data: the data to be written, can be of type byte, char, or string (char*). Schematics, PCB layout, Gerber and BOM files of ESP32-Sense Kit, the touch sensor development kit based on ESP32. . FireBeetle 2 ESP32-E has up to 24 physical GPIOs, which are mainly for connecting peripherals like sensors, actuators, etc. Notice that the pin numbering is "2/D9". For ESP8266_RTOS_SDK V3.0 and later versions (ESP-IDF style). . This document introduces the ESP-NOW technology developed by Espressif. The following program implements functions such as accessing SD card, manipulating files and folders, including reading and writing files. DFR0478 FireBeetle ESP32 IOT Microcontroller(V3.0) . FireBeetle 2 ESP32-E development board has two hardware serial ports, and both of them are remappable. FireBeetle 2 ESP32-E supports low power function, and in Deep-sleep mode, only RTC pin keeps working and can be used as a wave-up source. The ESP32-MeshKit-Sense Hardware Design Guidelines introduces the block diagram, PCB layout and function modules of the development board ESP32-MeshKit-Sense. FireBeetle 2 ESP32-E provides the function of capacitive touch sensing with a total of 7 touch pins available, labeled as T0 to T6. When the program is uploaded, the blue LED lights up. This document introduces the hardware specifications of ESP32-WROOM-32D and ESP32-WROOM-32U Datasheet. FireBeetle_Board_ESP32_E_SKU_DFR0654-DFRobot 2. It can be observed that when the sensor value is 4095, the detected voltage is about 3.3V. It supports WiFi and Bluetooth dual-mode communication and features a small size, ultra-low power consumption, on-board charging circuit, and easy-to-use interface, which can be conveniently used for smart home IoT . This document introduces the specifications of ESP32-WROVER-E and ESP32-WROVER-IE hardware, including overview, pin definitions, functional description, peripherals, and electrical characteristics, etc. Please find it in the "help" folder of the zip file. Frameworks. The display shows DFRobot" and "20220828" when all ready. This document introduces the specifications of ESP8685-WROOM-07 hardware, including overview, pin definitions, functional description, and electrical characteristics, etc. This document introduces the Simple-Pair technology developed by Espressif. Return value: the number of available bytes. It supports WiFi and Bluetooth dual-mode communication, and features small size, ultra-low power consumption, on-board charging circuit and easy-to-use interface, which can be conveniently used for smart home IoT, industrial IOT applications, wearable devices . The SPI of FireBeetle 2 ESP32-E can be configured to all I/O ports, and you can refer to the underlying code for usage (not recommended for beginners). This document provides the specifications of ESP32 family of chips. For 3.3V < Vbat < 4.2V, there is a consistent ~3.295 volts at the 3V3 pin. FireBeetle_ESP8266_IOT_Microcontroller_SKU__DFR0489-DFRobot 4us protecting interval. Make a Home-made Network Clock with ESP32-E. Introduction: This production will be very simple, getting the time from the internet via the wifi of the ESP32, and then you need to find a screen that displays the time. This document introduces to users the ESP32-MeshKit-Light, focusing on specifications, features, handling, etc. This document introduces the specifications of ESP32-PICO-V3-ZERO hardware, including overview, pin definitions, functional description, peripherals, and electrical characteristics, etc. When using Arduino for PWM LED dimming, you should follow the steps below: First, select a PWM channel. To provide a better user experience, FireBeetle 2 ESP32-E is configured by default with IO18 (SCK), IO19 (MISO), and IO23 (MOSI) as the SPI interface, which works well with Arduino. This guide provides users with functional descriptions, configuration options for ESP32-LyraT V4.3 audio development board, as well as how to get started with the ESP32-LyraT board. This document introduces frequency offset tuning and antenna impedance matching for ESP8266 in order to achieve optimum RF performance. This document introduces the specifications of ESP32-C3-WROOM-02 and ESP32-C3-WROOM-02U hardware, including overview, pin definitions, functional description, peripherals, and electrical characteristics, etc. ESP-WROOM-02D and ESP-WROOM-02U module reference design resources, including schematics, PCB layout, gerber files, and BOM lists. ESP32 is a series of powerful, power-efficient, cheap microcontrollers that comes with integrated Wi-Fi and dual-mode Bluetooth. The position must be between 0 and the size of the file. This document summarizes the packing requirements of Espressifs module products, including the packing method, packing-material dimensions, standard packing quantity, labels, dry-packing requirements and marking conventions. Here, we will demonstrate the operations provided by Light Blue on an iPhone. This document introduces the ESP32 AT commands, explains how to use them and provides examples of several common AT commands. Schematics, PCB layout, gerber and BOM files of ESP8684-MINI-1. Hardware. Return value: a boolean value, true if the file or folder exists, false if it does not exist. PSRAM Cache Bug Fix: Fixed When the CPU accesses the external SRAM in a certain sequence, read & write errors can occur.