Table 1.

Specifications of ESP32.

Microprocessor unit	ESP32 (240 MHz Tensilica dual-core 32 bits, 520 KB Static random-access memory (SRAM), Wi-Fi (802.11b/g/n), Bluetooth v4.2 Bluetooth basic rate/enhanced data rate (BR/EDR) and Bluetooth Low Energy (BLE), 4 MB External Serial Peripheral Interface (SPI) FLASH)
Integrated crysta	40 MHz crystal
Communications Protocols	Universal Asynchronous Receiver/Transmitter (UART); Serial Peripheral Interface (SPI); Inter-Integrated Circuit (I2C); Inter-IC Sound (I2S)
FLASH	4 MB Serial Peripheral Interface (SPI) FLASH