ESP-WROOM-02 vs ESP32-S2-SOLO-2
ESP-WROOM-02
WROOM · ESP8266 · Active
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ESP32-S2-SOLO-2
SOLO · ESP32-S2 · Active
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Figures here are compiled from Espressif's official datasheets, with the source linked on each page. Mistakes are possible, so if something looks off, please report it.
Which should you choose?
These run different SoCs (ESP8266 vs ESP32-S2), so they differ in CPU, wireless and peripherals, not just packaging.
Choose ESP-WROOM-02 if you need
- smaller footprint (18×20 mm)
Choose ESP32-S2-SOLO-2 if you need
- faster CPU (240 MHz, Xtensa LX7)
- PSRAM for camera frames, audio buffers and LVGL/large displays
- larger flash option (up to 16 MB) for bigger firmware and OTA
- native USB-OTG: act as a USB device/host without a USB-UART chip
- more usable GPIO (36 vs 11)
Size, to scale
- ESP-WROOM-02: 18×20 mm
- ESP32-S2-SOLO-2: 18×25.5 mm
Spec differences at a glance
- CPU: ESP-WROOM-02 Xtensa L106, 1-core · ESP32-S2-SOLO-2 Xtensa LX7, 1-core
- Max clock: ESP-WROOM-02 160 MHz · ESP32-S2-SOLO-2 240 MHz
- SRAM: ESP-WROOM-02 — KB · ESP32-S2-SOLO-2 320 KB
- ROM: ESP-WROOM-02 — KB · ESP32-S2-SOLO-2 128 KB
- Flash options: ESP-WROOM-02 2 MB · ESP32-S2-SOLO-2 4 / 8 / 16 MB
- PSRAM: ESP-WROOM-02 None · ESP32-S2-SOLO-2 2 MB (quad)
- Co-processor: ESP-WROOM-02 none · ESP32-S2-SOLO-2 ULP-RISC-V
- Usable GPIO: ESP-WROOM-02 11 · ESP32-S2-SOLO-2 36
- ADC: ESP-WROOM-02 1× 10-bit · ESP32-S2-SOLO-2 20× 12-bit
- USB: ESP-WROOM-02 USB-Serial(external) · ESP32-S2-SOLO-2 USB-OTG
- UART / SPI / I²C / I²S: ESP-WROOM-02 2 / 1 / 1 / 1 · ESP32-S2-SOLO-2 2 / 2 / 2 / 1
- TWAI (CAN): ESP-WROOM-02 No · ESP32-S2-SOLO-2 Yes
- SD/MMC: ESP-WROOM-02 Yes · ESP32-S2-SOLO-2 No
- Touch: ESP-WROOM-02 0 · ESP32-S2-SOLO-2 14
- Operating voltage: ESP-WROOM-02 2.7-3.6 V · ESP32-S2-SOLO-2 3.0-3.6 V
- Deep sleep: ESP-WROOM-02 20 µA · ESP32-S2-SOLO-2 — µA
- Dimensions: ESP-WROOM-02 18 × 20 × 2.8 mm · ESP32-S2-SOLO-2 18 × 25.5 × 3.1 mm
- Pin count: ESP-WROOM-02 18 · ESP32-S2-SOLO-2 41
- Secure boot: ESP-WROOM-02 No · ESP32-S2-SOLO-2 Yes
- Flash encryption: ESP-WROOM-02 No · ESP32-S2-SOLO-2 Yes
- Crypto: ESP-WROOM-02 — · ESP32-S2-SOLO-2 AES, SHA, RSA, HMAC, RNG
- Digital signature: ESP-WROOM-02 No · ESP32-S2-SOLO-2 Yes
Compute & memory
⚑ flag an error| ESP-WROOM-02 | ESP32-S2-SOLO-2 | |
|---|---|---|
| CPU≠ | Xtensa L106, 1-core | Xtensa LX7, 1-core |
| Max clock≠ | 160 MHz | 240 MHz |
| SRAM≠ | — KB | 320 KB |
| ROM≠ | — KB | 128 KB |
| Flash options≠ | 2 MB | 4 / 8 / 16 MB |
| PSRAM≠ | None | 2 MB (quad) |
| Co-processor≠ | none | ULP-RISC-V |
Wireless
⚑ flag an error| ESP-WROOM-02 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Wi-Fi bands | 2.4GHz | 2.4GHz |
| Bluetooth | — | — |
| 802.15.4 (Thread/Zigbee) | No | No |
| Antenna | PCB | PCB |
Peripherals & I/O
⚑ flag an error| ESP-WROOM-02 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Usable GPIO≠ | 11 | 36 |
| ADC≠ | 1× 10-bit | 20× 12-bit |
| USB≠ | USB-Serial(external) | USB-OTG |
| UART / SPI / I²C / I²S≠ | 2 / 1 / 1 / 1 | 2 / 2 / 2 / 1 |
| TWAI (CAN)≠ | No | Yes |
| SD/MMC≠ | Yes | No |
| Ethernet MAC | No | No |
| Touch≠ | 0 | 14 |
Power
⚑ flag an error| ESP-WROOM-02 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Operating voltage≠ | 2.7-3.6 V | 3.0-3.6 V |
| Deep sleep≠ | 20 µA | — µA |
Physical
⚑ flag an error| ESP-WROOM-02 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Dimensions≠ | 18 × 20 × 2.8 mm | 18 × 25.5 × 3.1 mm |
| Pin count≠ | 18 | 41 |
| Temp range | -40 to 85 °C | -40 to 85 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP-WROOM-02 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Secure boot≠ | No | Yes |
| Flash encryption≠ | No | Yes |
| Crypto≠ | — | AES, SHA, RSA, HMAC, RNG |
| Digital signature≠ | No | Yes |
| TRNG | Yes | Yes |