ESP32-SOLO-1 vs ESP8684-WROOM-03
ESP32-SOLO-1
SOLO · ESP32 · Active
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ESP8684-WROOM-03
WROOM · ESP32-C2 · 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 vs ESP32-C2), so they differ in CPU, wireless and peripherals, not just packaging.
Choose ESP32-SOLO-1 if you need
- Bluetooth Classic (BR/EDR) for legacy SPP / A2DP audio
- faster CPU (240 MHz, Xtensa LX6)
- Ethernet MAC for wired networking (add an external PHY)
- more usable GPIO (32 vs 8)
Choose ESP8684-WROOM-03 if you need
- smaller footprint (15×17.3 mm)
Size, to scale
- ESP32-SOLO-1: 18×25.5 mm
- ESP8684-WROOM-03: 15×17.3 mm
Spec differences at a glance
- CPU: ESP32-SOLO-1 Xtensa LX6, 1-core · ESP8684-WROOM-03 RISC-V, 1-core
- Max clock: ESP32-SOLO-1 240 MHz · ESP8684-WROOM-03 120 MHz
- SRAM: ESP32-SOLO-1 520 KB · ESP8684-WROOM-03 272 KB
- ROM: ESP32-SOLO-1 448 KB · ESP8684-WROOM-03 576 KB
- Flash options: ESP32-SOLO-1 4 MB · ESP8684-WROOM-03 2 / 4 MB
- Co-processor: ESP32-SOLO-1 ULP-FSM · ESP8684-WROOM-03 none
- Bluetooth: ESP32-SOLO-1 BT Classic + BLE · ESP8684-WROOM-03 BLE 5.x
- Usable GPIO: ESP32-SOLO-1 32 · ESP8684-WROOM-03 8
- ADC: ESP32-SOLO-1 18× 12-bit · ESP8684-WROOM-03 5× 12-bit
- UART / SPI / I²C / I²S: ESP32-SOLO-1 3 / 2 / 2 / 2 · ESP8684-WROOM-03 2 / 1 / 1 / 0
- TWAI (CAN): ESP32-SOLO-1 Yes · ESP8684-WROOM-03 No
- SD/MMC: ESP32-SOLO-1 Yes · ESP8684-WROOM-03 No
- Ethernet MAC: ESP32-SOLO-1 Yes · ESP8684-WROOM-03 No
- Touch: ESP32-SOLO-1 10 · ESP8684-WROOM-03 0
- Deep sleep: ESP32-SOLO-1 10 µA · ESP8684-WROOM-03 5 µA
- Dimensions: ESP32-SOLO-1 18 × 25.5 × 3.1 mm · ESP8684-WROOM-03 15 × 17.3 × 2.8 mm
- Pin count: ESP32-SOLO-1 38 · ESP8684-WROOM-03 11
- Temp range: ESP32-SOLO-1 -40 to 85 °C · ESP8684-WROOM-03 -40 to 105 °C
- Crypto: ESP32-SOLO-1 AES, SHA, RSA, RNG · ESP8684-WROOM-03 ECC, SHA, RNG
Compute & memory
⚑ flag an error| ESP32-SOLO-1 | ESP8684-WROOM-03 | |
|---|---|---|
| CPU≠ | Xtensa LX6, 1-core | RISC-V, 1-core |
| Max clock≠ | 240 MHz | 120 MHz |
| SRAM≠ | 520 KB | 272 KB |
| ROM≠ | 448 KB | 576 KB |
| Flash options≠ | 4 MB | 2 / 4 MB |
| PSRAM | None | None |
| Co-processor≠ | ULP-FSM | none |
Wireless
⚑ flag an error| ESP32-SOLO-1 | ESP8684-WROOM-03 | |
|---|---|---|
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Wi-Fi bands | 2.4GHz | 2.4GHz |
| Bluetooth≠ | BT Classic + BLE | BLE 5.x |
| 802.15.4 (Thread/Zigbee) | No | No |
| Antenna | PCB | PCB |
Peripherals & I/O
⚑ flag an error| ESP32-SOLO-1 | ESP8684-WROOM-03 | |
|---|---|---|
| Usable GPIO≠ | 32 | 8 |
| ADC≠ | 18× 12-bit | 5× 12-bit |
| USB | USB-Serial(external) | USB-Serial(external) |
| UART / SPI / I²C / I²S≠ | 3 / 2 / 2 / 2 | 2 / 1 / 1 / 0 |
| TWAI (CAN)≠ | Yes | No |
| SD/MMC≠ | Yes | No |
| Ethernet MAC≠ | Yes | No |
| Touch≠ | 10 | 0 |
Power
⚑ flag an error| ESP32-SOLO-1 | ESP8684-WROOM-03 | |
|---|---|---|
| Operating voltage | 3.0-3.6 V | 3.0-3.6 V |
| Deep sleep≠ | 10 µA | 5 µA |
Physical
⚑ flag an error| ESP32-SOLO-1 | ESP8684-WROOM-03 | |
|---|---|---|
| Dimensions≠ | 18 × 25.5 × 3.1 mm | 15 × 17.3 × 2.8 mm |
| Pin count≠ | 38 | 11 |
| Temp range≠ | -40 to 85 °C | -40 to 105 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP32-SOLO-1 | ESP8684-WROOM-03 | |
|---|---|---|
| Secure boot | Yes | Yes |
| Flash encryption | Yes | Yes |
| Crypto≠ | AES, SHA, RSA, RNG | ECC, SHA, RNG |
| Digital signature | No | No |
| TRNG | Yes | Yes |