ESP32-C61-WROOM-1 vs ESP32-S2-SOLO-2
ESP32-C61-WROOM-1
WROOM · ESP32-C61 · New
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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 (ESP32-C61 vs ESP32-S2), so they differ in CPU, wireless and peripherals, not just packaging.
Choose ESP32-C61-WROOM-1 if you need
- Wi-Fi 6: better battery life and throughput in busy networks
- Bluetooth LE
- more PSRAM (up to 8 MB)
Choose ESP32-S2-SOLO-2 if you need
- faster CPU (240 MHz, Xtensa LX7)
- native USB-OTG: act as a USB device/host without a USB-UART chip
- more usable GPIO (36 vs 23)
Size, to scale
Same footprint: both are 18×25.5 mm.
Spec differences at a glance
- CPU: ESP32-C61-WROOM-1 RISC-V, 1-core · ESP32-S2-SOLO-2 Xtensa LX7, 1-core
- Max clock: ESP32-C61-WROOM-1 160 MHz · ESP32-S2-SOLO-2 240 MHz
- ROM: ESP32-C61-WROOM-1 256 KB · ESP32-S2-SOLO-2 128 KB
- Flash options: ESP32-C61-WROOM-1 8 / 16 MB · ESP32-S2-SOLO-2 4 / 8 / 16 MB
- PSRAM: ESP32-C61-WROOM-1 2 / 8 MB (quad) · ESP32-S2-SOLO-2 2 MB (quad)
- Co-processor: ESP32-C61-WROOM-1 none · ESP32-S2-SOLO-2 ULP-RISC-V
- Wi-Fi: ESP32-C61-WROOM-1 Wi-Fi 6 · ESP32-S2-SOLO-2 Wi-Fi 4
- Bluetooth: ESP32-C61-WROOM-1 BLE 5.x · ESP32-S2-SOLO-2 —
- Usable GPIO: ESP32-C61-WROOM-1 23 · ESP32-S2-SOLO-2 36
- ADC: ESP32-C61-WROOM-1 4× 12-bit · ESP32-S2-SOLO-2 20× 12-bit
- USB: ESP32-C61-WROOM-1 USB-Serial-JTAG · ESP32-S2-SOLO-2 USB-OTG
- UART / SPI / I²C / I²S: ESP32-C61-WROOM-1 3 / 1 / 1 / 1 · ESP32-S2-SOLO-2 2 / 2 / 2 / 1
- TWAI (CAN): ESP32-C61-WROOM-1 No · ESP32-S2-SOLO-2 Yes
- SD/MMC: ESP32-C61-WROOM-1 Yes · ESP32-S2-SOLO-2 No
- Touch: ESP32-C61-WROOM-1 0 · ESP32-S2-SOLO-2 14
- Deep sleep: ESP32-C61-WROOM-1 10 µA · ESP32-S2-SOLO-2 — µA
- Pin count: ESP32-C61-WROOM-1 29 · ESP32-S2-SOLO-2 41
- Lifecycle: ESP32-C61-WROOM-1 New · ESP32-S2-SOLO-2 Active
- Crypto: ESP32-C61-WROOM-1 AES, SHA, ECC, ECDSA, RNG · ESP32-S2-SOLO-2 AES, SHA, RSA, HMAC, RNG
Compute & memory
⚑ flag an error| ESP32-C61-WROOM-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| CPU≠ | RISC-V, 1-core | Xtensa LX7, 1-core |
| Max clock≠ | 160 MHz | 240 MHz |
| SRAM | 320 KB | 320 KB |
| ROM≠ | 256 KB | 128 KB |
| Flash options≠ | 8 / 16 MB | 4 / 8 / 16 MB |
| PSRAM≠ | 2 / 8 MB (quad) | 2 MB (quad) |
| Co-processor≠ | none | ULP-RISC-V |
Wireless
⚑ flag an error| ESP32-C61-WROOM-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Wi-Fi≠ | Wi-Fi 6 | Wi-Fi 4 |
| Wi-Fi bands | 2.4GHz | 2.4GHz |
| Bluetooth≠ | BLE 5.x | — |
| 802.15.4 (Thread/Zigbee) | No | No |
| Antenna | PCB | PCB |
Peripherals & I/O
⚑ flag an error| ESP32-C61-WROOM-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Usable GPIO≠ | 23 | 36 |
| ADC≠ | 4× 12-bit | 20× 12-bit |
| USB≠ | USB-Serial-JTAG | USB-OTG |
| UART / SPI / I²C / I²S≠ | 3 / 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| ESP32-C61-WROOM-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Operating voltage | 3.0-3.6 V | 3.0-3.6 V |
| Deep sleep≠ | 10 µA | — µA |
Physical
⚑ flag an error| ESP32-C61-WROOM-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Dimensions | 18 × 25.5 × 3.1 mm | 18 × 25.5 × 3.1 mm |
| Pin count≠ | 29 | 41 |
| Temp range | -40 to 85 °C | -40 to 85 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle≠ | New | Active |
Security
⚑ flag an error| ESP32-C61-WROOM-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Secure boot | Yes | Yes |
| Flash encryption | Yes | Yes |
| Crypto≠ | AES, SHA, ECC, ECDSA, RNG | AES, SHA, RSA, HMAC, RNG |
| Digital signature | Yes | Yes |
| TRNG | Yes | Yes |