FireBeetle 2 ESP32-E, specially designed for IoT, is an ESP-WROOM-32E-based main controller board with dual-core chips. 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, industrial IoT applications, and wearable devices, and so on. You can easily create your own IoT smart home system when connecting it with an IoT platform like IFTTT. FireBeetle 2 ESP32-E supports Arduino programming and will support Scratch graphical programming and MicroPython programming very soon. We provide you with detailed online tutorials and application cases, and there are thousands of sensors with welding-free Gravity interfaces and actuators to help you get started easily. 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 a prototype. Note: FireBeetle 2 and FireBeetle pins and sizes are not compatible, and neither are the expansion boards. Figure 1. Board Overview Figure 2. Pinout What's the difference between FireBeetle 2 ESP32-E and FireBeetle ESP32? -ESP32-E uses a data encryption chip to protect program security -ESP32-E is equipped with a DFRobot GDI(General Display Interface) to connect screens like DFR0664/DFR0649/DFR0665/DFR0669 -Software are ecologically compatible with both ESP32 and ESP32-E, except for minor changes in pin mapping -ESP32-E cannot use an expansion board for ESP32 V4.0 SKU DFR0478 DFR0654 Microcontroller ESP32-D ESP32-E Power Supply Interface Micro USB USB-C USB to UART CH340C CH340K Operating Voltage (V) 3.3V 3.3V Flash 16MB 4MB SRAM (KB) 520k 520k Analog Pins 5 5 Digital Pins 10 10 UART 1 1 I2C 1 1 SPI 1 1 Side Key × √ RGB_LED × √ DisplayPort (GDI) × √ Stamp Holes × √ Fool-proof × √ Silkscreen underside two-sided Mount Hole Size (mm) 3.5 2 Dimension (mm) 29*58 25.4*60 Weight (g) 24 g 23g Espressif has recently released one wafer-level change on the ESP32 Series of products: ESP32-E. Below are the main design changes in the ESP32-E Series of chips: 1. PSRAM Cache Bug Fix: Fixed “When the CPU accesses the external SRAM in a certain sequence, read & write errors can occur”. 2. Fixed “When each CPU reads certain different address spaces simultaneously, a read error can occur.” 3. Optimized 32.768 KHz crystal oscillator stability, the issue was reported by the client that there is a low probability that under ESP32-D hardware, the 32.768 kHz crystal oscillator couldn’t start properly. 4. Fixed Fault injection issues regarding secure boot and flash encryption are fixed. 5. Improvement: Changed the minimum baud rate supported by the CAN module from 25 kHz to 12.5 kHz.
