Compatible Boards
Requirements
- Chip: one of the chips listed under Chip support
- Flash: at least 4 MB
RAM is determined by the chip and module: 384-520 KB of internal SRAM, shared by the runtime, WiFi/BLE stacks, your app, and every loaded module. PSRAM variants (ESP32-S3, ESP32-C5, ESP32 WROVER) add external SPI memory in the same package, which lets larger apps use memory beyond the SRAM budget.
Chip support
| Chip | Notes |
|---|---|
| ESP32‑C6 | Recommended. Primary development chip. WiFi 6, BLE 5, Thread/Zigbee. |
| ESP32‑S3 | Recommended. PSRAM variants fit larger apps. |
| ESP32‑C5 | Recommended. Dual-band WiFi 6 and BLE 5. Requires PSRAM for the standard Mikro.js configuration (WiFi + BLE concurrently); 5 GHz needs wifi.country set. |
| ESP32 | Supported. Prefer WROVER variants (4-8 MB PSRAM) over WROOM. |
| ESP32‑C3 | Limited support. Good fit for GPIO, timers, sensors, and BLE. Not enough RAM for HTTPS or memory intensive applications. |
Tested
| Board | Chip | Flash | PSRAM | Link |
|---|---|---|---|---|
| Seeed Studio XIAO ESP32C6 | ESP32‑C6 | 4 MB | - | seeedstudio.com |
| Seeed Studio XIAO ESP32S3 | ESP32‑S3 | 8 MB | 8 MB | seeedstudio.com |
| Seeed Studio XIAO ESP32C5 | ESP32‑C5 | 8 MB | 8 MB | seeedstudio.com |
| Seeed Studio XIAO ESP32C3 | ESP32‑C3 | 4 MB | - | seeedstudio.com |
Other boards
Any board with a supported chip and at least 4 MB flash should work, regardless of manufacturer: Adafruit, SparkFun, Waveshare, LILYGO, WeAct, generic DevKits. If you try one, let us know.
ESP32-S3 boards with octal PSRAM (N8R8, N16R8) need a custom firmware setting to use their PSRAM; see Troubleshooting.