The DFRobot FireBeetle series comprises energy-efficient development modules specifically designed for the Internet of Things (IoT). One of these modules is the FireBeetle Covers-Camera & Audio Media Board, a versatile multimedia device for IoT applications. It offers various interfaces to connect components such as the NAU8822 CODEC IIS, OV7725 camera, SD card (SDIO), earphone, and microphone.
Additionally, this media board features a mini MIC input interface. The NAU8822 CODEC IIS is capable of driving both a 12W BTL loudspeaker at 8Ω and a 40mW earphone at 16ohm. It supports direct connections for easy integration. Furthermore, the NAU8822 supports DAC sound signal acquisition and a programmable microphone amplifier. This allows for audio recording when input voices are provided via the onboard MIC interface or an external microphone, with the ability to save the recordings to an SD card. Moreover, when connected to an OV7725 CAMERA, the board enables the functionality to capture photos.
With any FireBeetle main boards (e.g. ESP32 main board), the FireBeetle Covers-Camera & Audio Media Board could be a MP3, a recorder, a camera. Once connected to the Internet, it could be an Internet radio, a cloud image recognition.
- This media board only supports FireBeetle ESP32 main board at present, for other main boards do not equipped with IIS interface.
- The flat ribbon cable of camera is relatively easy-to-break, please be careful and light in connection. The camera shot must be opposite to the SD card slot.
- It does not support video shooting and transmission.
- Operating Voltage: 3.7V~5.5V (VCC)
- Output Voltage: 3.3V
- User-defined Button: tested by IO16(DI)
- RESET x1
- SD Card:
Bus Interface: SDIO Protocol
Default Transmission Rate: 10MHz
Max. Transmission Rate: 20MHz
- Camera OV7725: (data as below is just for reference; some functions could not be realized by ESP32 now).
Photosensitive/Light-sensitive Array: 640x480
Optical Size: 1/6"
Angle of View: 25Deg
SCCB Standard Interface
Output Pixel Format: Raw RGB，RGB(RGB4:2:2 ,RGB565/555/444)，YCbCr (4:2:2)
Image Size: VGA,QVGA and CIF to 40x30
Auto Image Control: auto exposure control (AEC), auto gain control (AGC), auto white balance (AWB), auto band filter and auto black level (ABL) calibration.
Image Quality Control: saturation, tone, gamma, clarity and anti-interference
ISP: noise reduction and defect calibration
Lens Shading Correction
Auto Saturation Adjustment
DAC:94dB SNR , -84db THD
ADC:90dB SNR , -80dB THD
Integrated BTL loudspeaker drive: 1W @ 8Ohm
Integrated earphone drive: 40mW @ 16Ohm
Integrated programmable microphone amplifier
Typical Sampling Rate: 8KHz, 48KHz, 96KHz, 192KHz
Standard Video Interface: PCM and I2S
Type: Electret Capacitor
Frequency Range: 100Hz~15KHz
Sensitivity: -43dB ±5dB @ 94dB SPL
Signal-to-noise Ratio: 58Db