ESP32-SOLO-1 vs ESP32-WROOM-32E
ESP32-SOLO-1
SOLO · ESP32 · Active
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ESP32-WROOM-32E
WROOM · ESP32 · Active
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Every figure here is checked against Espressif’s official datasheets. We’ve taken every care to keep it accurate — but datasheets are dense and mistakes happen, so if something looks off, please report it.
Which should you choose?
Both use the ESP32 SoC but differ in CPU configuration, so weigh compute against memory and form factor.
Choose ESP32-SOLO-1 if you need
- more usable GPIO (32 vs 26)
Choose ESP32-WROOM-32E if you need
- 2 CPU cores vs 1 — more headroom for RTOS / parallel work
- PSRAM for camera frames, audio buffers and LVGL/large displays
- larger flash option (up to 16 MB) for bigger firmware and OTA
Size, to scale
Same footprint — both are 18×25.5 mm.
Spec differences at a glance
- CPU: ESP32-SOLO-1 Xtensa LX6, 1-core · ESP32-WROOM-32E Xtensa LX6, 2-core
- Flash options: ESP32-SOLO-1 4 MB · ESP32-WROOM-32E 4 / 8 / 16 MB
- PSRAM: ESP32-SOLO-1 None · ESP32-WROOM-32E 2 MB (quad)
- Usable GPIO: ESP32-SOLO-1 32 · ESP32-WROOM-32E 26
Compute & memory
⚑ flag an error| ESP32-SOLO-1 | ESP32-WROOM-32E | |
|---|---|---|
| CPU≠ | Xtensa LX6, 1-core | Xtensa LX6, 2-core |
| Max clock | 240 MHz | 240 MHz |
| SRAM | 520 KB | 520 KB |
| ROM | 448 KB | 448 KB |
| Flash options≠ | 4 MB | 4 / 8 / 16 MB |
| PSRAM≠ | None | 2 MB (quad) |
| Co-processor | ULP-FSM | ULP-FSM |
Wireless
⚑ flag an error| ESP32-SOLO-1 | ESP32-WROOM-32E | |
|---|---|---|
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Wi-Fi bands | 2.4GHz | 2.4GHz |
| Bluetooth | BT Classic + BLE | BT Classic + BLE |
| 802.15.4 (Thread/Zigbee) | No | No |
| Antenna | PCB | PCB |
Peripherals & I/O
⚑ flag an error| ESP32-SOLO-1 | ESP32-WROOM-32E | |
|---|---|---|
| Usable GPIO≠ | 32 | 26 |
| ADC | 18× 12-bit | 18× 12-bit |
| USB | USB-Serial(external) | USB-Serial(external) |
| UART / SPI / I²C / I²S | 3 / 2 / 2 / 2 | 3 / 2 / 2 / 2 |
| TWAI (CAN) | Yes | Yes |
| SD/MMC | Yes | Yes |
| Ethernet MAC | Yes | Yes |
| Touch | 10 | 10 |
Power
⚑ flag an error| ESP32-SOLO-1 | ESP32-WROOM-32E | |
|---|---|---|
| Operating voltage | 3.0-3.6 V | 3.0-3.6 V |
| Deep sleep | 10 µA | 10 µA |
Physical
⚑ flag an error| ESP32-SOLO-1 | ESP32-WROOM-32E | |
|---|---|---|
| Dimensions | 18 × 25.5 × 3.1 mm | 18 × 25.5 × 3.1 mm |
| Pin count | 38 | 38 |
| Temp range | -40 to 85 °C | -40 to 85 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP32-SOLO-1 | ESP32-WROOM-32E | |
|---|---|---|
| Secure boot | Yes | Yes |
| Flash encryption | Yes | Yes |
| Crypto | AES, SHA, RSA, RNG | AES, SHA, RSA, RNG |
| Digital signature | No | No |
| TRNG | Yes | Yes |