Wireless Processing for Custom Embedded Hardware The Espressif ESP32-S3-WROOM-1 integrates an ESP32-S3 processor, flash memory, a 40MHz crystal and an onboard PCB antenna into a compact surface-mount module. Its dual-core LX7 processor and 2.4GHz wireless connectivity support custom sensor nodes, control panels, connected appliances and embedded audio or vision development. This is a bare solder-down module, not a USB development board. A host PCB, regulated power, programming connections and application-specific peripherals are required. Choose the exact memory suffix before ordering or designing your firmware. Choose Your Memory Configuration WROOM-1 suffix Flash PSRAM Ambient range N4 4MB Quad SPI None -40 to +85 C N8 8MB Quad SPI None -40 to +85 C N16 16MB Quad SPI None -40 to +85 C N4R2 4MB Quad SPI 2MB Quad SPI -40 to +85 C N8R2 8MB Quad SPI 2MB Quad SPI -40 to +85 C N16R2 16MB Quad SPI 2MB Quad SPI -40 to +85 C N4R8 4MB Quad SPI 8MB Octal SPI -40 to +65 C N8R8 8MB Quad SPI 8MB Octal SPI -40 to +65 C N16R8 16MB Quad SPI 8MB Octal SPI -40 to +65 C For example, N16R8 identifies ESP32-S3-WROOM-1-N16R8: 16MB flash plus 8MB PSRAM. Each option is a separate module configuration, not a bundle. Flash stores firmware and data; PSRAM adds working memory. A larger flash does not compensate for insufficient RAM. Choose a non-PSRAM version for workloads that fit the internal memory, R2 for additional buffering, or R8 for more demanding graphics, camera or audio workloads. Firmware must use the matching memory interface. No 16MB-PSRAM, H4 high-temperature or WROOM-1U external-antenna version is selectable in this listing. The R8 ranges above use the standard configuration. Espressif's current datasheet describes an optional PSRAM ECC configuration that permits +85 C ambient while reducing usable PSRAM by 1/16; this requires deliberate configuration and is not the default rating shown here. Core Specifications Manufacturer / family Espressif / ESP32-S3-WROOM-1 CPU Dual-core 32-bit Xtensa LX7 with single-precision FPU, up to 240MHz On-chip memory 384KB ROM, 512KB SRAM and 16KB RTC SRAM Wi-Fi 2.4GHz 802.11 b/g/n; up to 150Mbps PHY rate, not guaranteed application throughput Bluetooth Bluetooth 5 LE, including mesh support through suitable software; no Bluetooth Classic BLE PHY rates 125Kbps, 500Kbps, 1Mbps and 2Mbps Antenna Integrated PCB antenna, shared by Wi-Fi and Bluetooth Supply 3.0-3.6V; nominal 3.3V Module dimensions 18.0 x 25.5 x 3.1mm Integrated crystal 40MHz reference crystal; separate from the maximum CPU frequency GPIO Up to 36; usable pins depend on memory and peripheral configuration Interfaces and Development Possibilities The ESP32-S3 provides UART, I2C, SPI, I2S, LCD and parallel camera interfaces, ADC, touch sensing, LED PWM, motor-control PWM, pulse counting, timers and watchdogs. USB full-speed OTG and USB Serial/JTAG are controller functions available for host-board integration, not physical USB sockets on this module. A TWAI controller is available for CAN-related designs, but needs an external transceiver. Displays, cameras, microphones and motor drivers are also external hardware. Neural-network and signal-processing support can help suitable embedded workloads; it does not mean the module includes a ready-to-run voice assistant or recognition application. Host-PCB Integration Checklist Use a stable regulated 3.3V supply with appropriate decoupling and transient capability. Do not connect 5V USB power directly to the module's supply pin. Follow Espressif's recommended land pattern, ground-pad connection, reset timing and strapping-pin requirements. Reserve the antenna keep-out area and keep nearby metal, copper and components clear as specified by the hardware design guidance. Provide UART or supported native USB programming access, plus the required boot and reset circuitry. Check pin restrictions for the chosen memory version. On R8 modules, GPIO35, GPIO36 and GPIO37 are used by Octal PSRAM and are not available for other connections. Select the matching flash size, PSRAM mode and partition layout in ESP-IDF or a compatible ESP32-S3 development environment. Package Contents 1 x ESP32-S3-WROOM-1 module in the selected memory configuration, with integrated PCB antenna. No carrier board, USB cable, programmer, power regulator, camera, display or external antenna is listed as included. Surface-mount assembly is required; this is not a breadboard-ready header module. Technical Documentation Espressif ESP32-S3-WROOM-1 / WROOM-1U Datasheet includes the ordering table, pin definitions, electrical characteristics, dimensions and integration references. Use the WROOM-1 sections and the exact suffix you select. Frequently Asked Questions Do all versions include PSRAM? No. N4, N8 and N16 have no PSRAM. R2 versions add 2MB; R8 versions add 8MB. All retain the ESP32-S3's internal SRAM. Is WROOM-1 the same as WROOM-1U? No. WROOM-1 has a PCB antenna. WROOM-1U uses an external antenna connector and has different dimensions. This listing is for WROOM-1. Can I power it directly from USB? No. The bare module requires 3.0-3.6V, normally regulated 3.3V. USB power must go through suitable host-board regulation and protection. Does it support 5GHz Wi-Fi or Bluetooth Classic audio? No. It supports 2.4GHz Wi-Fi and Bluetooth LE, not 5GHz Wi-Fi or Bluetooth Classic profiles. Can I replace one memory suffix with another without changes? Do not assume a drop-in firmware replacement. Check PSRAM interface settings, flash partitions, reserved pins and temperature limits as well as the host PCB. Are cameras and AI software included? No. Camera, audio and display interfaces are development capabilities. Peripherals and application firmware must be provided separately. Is it suitable for a first USB programming lesson? A complete ESP32-S3 development board is easier for that purpose. This module is intended for custom PCBs or a suitable carrier with power and programming circuitry.
