ESP32-S2-WROOM vs ESP32-SOLO-1
ESP32-S2-WROOM
WROOM · ESP32-S2 · Active
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ESP32-SOLO-1
SOLO · ESP32 · 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 (ESP32-S2 vs ESP32), so they differ in CPU, wireless and peripherals, not just packaging.
Choose ESP32-S2-WROOM if you need
- native USB-OTG: act as a USB device/host without a USB-UART chip
- more usable GPIO (37 vs 32)
Choose ESP32-SOLO-1 if you need
- Bluetooth LE
- Ethernet MAC for wired networking (add an external PHY)
- smaller footprint (18×25.5 mm)
Size, to scale
- ESP32-S2-WROOM: 18×31 mm
- ESP32-SOLO-1: 18×25.5 mm
Spec differences at a glance
- CPU: ESP32-S2-WROOM Xtensa LX7, 1-core · ESP32-SOLO-1 Xtensa LX6, 1-core
- SRAM: ESP32-S2-WROOM 320 KB · ESP32-SOLO-1 520 KB
- ROM: ESP32-S2-WROOM 128 KB · ESP32-SOLO-1 448 KB
- Co-processor: ESP32-S2-WROOM ULP-RISC-V · ESP32-SOLO-1 ULP-FSM
- Bluetooth: ESP32-S2-WROOM — · ESP32-SOLO-1 BT Classic + BLE
- Usable GPIO: ESP32-S2-WROOM 37 · ESP32-SOLO-1 32
- ADC: ESP32-S2-WROOM 20× 12-bit · ESP32-SOLO-1 18× 12-bit
- USB: ESP32-S2-WROOM USB-OTG · ESP32-SOLO-1 USB-Serial(external)
- UART / SPI / I²C / I²S: ESP32-S2-WROOM 2 / 2 / 2 / 1 · ESP32-SOLO-1 3 / 2 / 2 / 2
- SD/MMC: ESP32-S2-WROOM No · ESP32-SOLO-1 Yes
- Ethernet MAC: ESP32-S2-WROOM No · ESP32-SOLO-1 Yes
- Touch: ESP32-S2-WROOM 14 · ESP32-SOLO-1 10
- Deep sleep: ESP32-S2-WROOM — µA · ESP32-SOLO-1 10 µA
- Dimensions: ESP32-S2-WROOM 18 × 31 × 3.3 mm · ESP32-SOLO-1 18 × 25.5 × 3.1 mm
- Pin count: ESP32-S2-WROOM 42 · ESP32-SOLO-1 38
- Crypto: ESP32-S2-WROOM AES, SHA, RSA, HMAC, RNG · ESP32-SOLO-1 AES, SHA, RSA, RNG
- Digital signature: ESP32-S2-WROOM Yes · ESP32-SOLO-1 No
Compute & memory
⚑ flag an error| ESP32-S2-WROOM | ESP32-SOLO-1 | |
|---|---|---|
| CPU≠ | Xtensa LX7, 1-core | Xtensa LX6, 1-core |
| Max clock | 240 MHz | 240 MHz |
| SRAM≠ | 320 KB | 520 KB |
| ROM≠ | 128 KB | 448 KB |
| Flash options | 4 MB | 4 MB |
| PSRAM | None | None |
| Co-processor≠ | ULP-RISC-V | ULP-FSM |
Wireless
⚑ flag an error| ESP32-S2-WROOM | ESP32-SOLO-1 | |
|---|---|---|
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Wi-Fi bands | 2.4GHz | 2.4GHz |
| Bluetooth≠ | — | BT Classic + BLE |
| 802.15.4 (Thread/Zigbee) | No | No |
| Antenna | PCB | PCB |
Peripherals & I/O
⚑ flag an error| ESP32-S2-WROOM | ESP32-SOLO-1 | |
|---|---|---|
| Usable GPIO≠ | 37 | 32 |
| ADC≠ | 20× 12-bit | 18× 12-bit |
| USB≠ | USB-OTG | USB-Serial(external) |
| UART / SPI / I²C / I²S≠ | 2 / 2 / 2 / 1 | 3 / 2 / 2 / 2 |
| TWAI (CAN) | Yes | Yes |
| SD/MMC≠ | No | Yes |
| Ethernet MAC≠ | No | Yes |
| Touch≠ | 14 | 10 |
Power
⚑ flag an error| ESP32-S2-WROOM | ESP32-SOLO-1 | |
|---|---|---|
| Operating voltage | 3.0-3.6 V | 3.0-3.6 V |
| Deep sleep≠ | — µA | 10 µA |
Physical
⚑ flag an error| ESP32-S2-WROOM | ESP32-SOLO-1 | |
|---|---|---|
| Dimensions≠ | 18 × 31 × 3.3 mm | 18 × 25.5 × 3.1 mm |
| Pin count≠ | 42 | 38 |
| Temp range | -40 to 85 °C | -40 to 85 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP32-S2-WROOM | ESP32-SOLO-1 | |
|---|---|---|
| Secure boot | Yes | Yes |
| Flash encryption | Yes | Yes |
| Crypto≠ | AES, SHA, RSA, HMAC, RNG | AES, SHA, RSA, RNG |
| Digital signature≠ | Yes | No |
| TRNG | Yes | Yes |