Device identity and wireless parametric summary
The ESP32-S2-SOLO-U-N4 is a single-core WiFi module from the ESP32 series, integrating the ESP32-S2 chip with 4 MB flash, 128 kB ROM, and 336 kB SRAM on a 40-SMD module package. It supports 802.11b/g/n at 2.4 GHz with a maximum data rate of 150 Mbps, a receiver sensitivity of -97 dBm, and a transmit power of 19.5 dBm — sufficient for indoor and short-range outdoor links with a clear line-of-sight budget.
Memory and peripheral integration for embedded control
With 4 MB on-board flash and 336 kB SRAM, the module can host a full TCP/IP stack and application code without external memory for many IoT endpoints — the flash holds firmware and configuration data, while the SRAM supports the runtime heap and stack. The serial interface set includes ADC, GPIO, I²C, I²S, SPI, PWM, UART, and USB, allowing direct connection to sensors, displays, and actuators without an external microcontroller.
Package, antenna options, and temperature grade
Antenna options include an on-board PCB trace antenna and an IPEX connector for an external antenna — the PCB trace saves cost and space in compact designs, while the IPEX port allows a remote antenna for better RF placement.