| Camera | The 2 MP camera OV2640 has a 66.5° field of view and a maximum resolution of 1600x1200. You can change the resolution when developing applications. |
| Module Power LED | The LED (green) turns on when USB power is connected to the board. If it is not turned on, it indicates either the USB power is not supplied, or the 5 V to 3.3 V LDO is broken. Software can configure GPIO3 to set different LED statuses (turned on/off, flashing) for different statuses of the board. Note: GPIO3 must be set up in open-drain mode. Pulling GPIO3 up may burn the LED. |
| Pin Headers | Connect the female headers on the sub board. |
| 5 V to 3.3 V LDO | Power regulator that converts a 5 V supply into a 3.3 V output for the module. |
| Digital Microphone | The digital I²S MEMS microphone features 61 dB SNR and –26 dBFS sensitivity, working at 3.3 V. |
| FPC Connector | Connects the main board and the sub board. |
| Function Button | There are six function buttons on the board. Users can configure any functions as needed except for the RST button. |
| ESP32-S3-WROOM-1 | The ESP32-S3-WROOM-1 module embeds the ESP32-S3R8 chip variant that provides Wi-Fi and Bluetooth 5 (LE) connectivity, as well as dedicated vector instructions for accelerating neural network computing and signal processing. On top of the integrated 8 MB Octal SPI PSRAM offered by the SoC, the module also comes with 8 MB flash, allowing for fast data access. ESP32-S3-WROOM-1U module is also supported. |
| MicroSD Card Slot | Used for inserting a MicroSD card to expand memory capacity. |
| 3.3 V to 1.5 V LDO | Power regulator that converts a 3.3 V supply into a 1.5 V output for the camera. |
| 3.3 V to 2.8 V LDO | Power regulator that converts a 3.3 V supply into a 2.8 V output for the camera. |
| USB Port | A Micro-USB port used for 5 V power supply to the board, as well as for communication with the chip via GPIO19 and GPIO20. |
| Battery Soldering Points | Used for soldering a battery socket to connect an external Li-ion battery that can serve as an alternative power supply to the board. If you use an external battery, make sure it has built-in protection circuit and fuse. The recommended specifications of the battery: capacity > 1000 mAh, output voltage 3.7 V, input voltage 4.2 V – 5 V. |
| Battery Charger Chip | 1 A linear Li-ion battery charger (ME4054BM5G-N) in ThinSOT package. The power source for charging is the USB Port. |
| Battery Red LED | When the USB power is connected to the board and a battery is not connected, the red LED blinks. If a battery is connected and being charged, the red LED turns on. When the battery is fully charged, it turns off. |
| Accelerometer | Three-axis accelerometer (QMA7981) for screen rotation, etc. |
