FireBeetle Covers-Camera&Audio Media Board

Introduction
DFRobot FireBeetle series are low power consumption development modules designed for Internet of Things (IoT). The FireBeetle Covers-Camera & Audio Media Board is a multimedia device for IoT that provides interfaces to connect NAU8822 CODEC IIS, OV7725 camera, SD card (SDIO), earphone and microphone.
Moreover, it equips with a mini MIC input interface. The NAU8822 CODEC IIS can drive both 12@8¦¸ BTL loudspeaker and 40mW@16¦¸ earphone. The direct connection is supported. Meanwhile, NAU8822 supports DAC sound signal acquisition and programmable microphone amplifier. The recording is available when input voices with onboard MIC interface or microphone then save it to SD card. What's more, the function to take photos is available when connected to an OV7725 CAMERA.
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.
NOTE:
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.
Specification
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: 640*480
Optical Size: 1/6"
Angle of View: 25¡ã
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
VarioPixel Subsampling
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
Frame Synchronization
Fixed-focus
NAU8822:
DAC:94dB SNR , -84db THD
ADC:90dB SNR , -80dB THD
Integrated BTL loudspeaker drive: 1W @ 8¦¸
Integrated earphone drive: 40mW @ 16¦¸
Integrated programmable microphone amplifier
Typical Sampling Rate: 8KHz, 48KHz, 96KHz, 192KHz
Standard Video Interface: PCM and I2S
MIC:
Type: Electret Capacitor
Output: analog
Direction: omnidirectional
Frequency Range: 100Hz~15KHz
Sensitivity: -43dB ¡À5dB @ 94dB SPL
Signal-to-noise Ratio: 58Db
Shipping List
FireBeetle Covers-Camera&Audio Media Board(V1.0) x1
OV7725 Camera x1
18pin-2.54mm Male Pin Header ¡Á2
18pin-2.54mm Female Pin Header ¡Á2