DFRobotFireBeetle 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.

It is equipped with a mini MIC input interface. The NAU8822 CODEC IIS can drive both 12@8 BTL loudspeaker and 40mW@16 earphone. Direct connection is supported. Meanwhile, NAU8822 supports DAC sound signal acquisition and a programmable microphone amplifier. Recording is available when input voices with onboard MIC interface or microphone are saved to the SD card. Photo capture is available when connected to an OV7725 camera.

Function Diagram

With any FireBeetle main boards(e.g. ESP32 main board), the FireBeetle Covers-Camera & Audio Media Board can function as an MP3 player, recorder, or camera. Once connected to the Internet, it can be used as an Internet radio or for cloud image recognition.

NOTE: This media board only supports the FireBeetle ESP32 main boardat present, as other boards do not have an IIS interface. The flat ribbon cable of the camera is relatively fragileplease connect carefully. The camera lens must face opposite the SD card slot. Video shooting and transmission are not supported.

Specification

• Operating Voltage: 3.7V ~ 5.5V (VCC)
• Output Voltage: 3.3V
• User-defined Button: tested by IO16(DI)
• RESET 1
• SD Card:
  • Bus Interface: SDIO Protocol
  • Default Transmission Rate: 10MHz
  • Max. Transmission Rate: 20MHz
• Camera OV7725:
  • Photosensitive Array: 640 480
  • Optical Size: 1/6″
  • Angle of View: 25
  • SCCB Standard Interface
  • Output Pixel Format: Raw RGB, RGB (RGB4:2:2, RGB565/555/444), YCbCr (4:2:2)
  • Image Size: VGA, QVGA, CIF to 40 30
  • VarioPixel Subsampling
  • Auto Image Control: AEC, AGC, AWB, auto band filter, ABL calibration
  • Image Quality Control: saturation, tone, gamma, clarity, 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
  • Programmable microphone amplifier
  • Typical Sampling Rate: 8KHz, 48KHz, 96KHz, 192KHz
  • Standard Audio Interface: PCM and I2S
• MIC:
  • Type: Electret Capacitor
  • Output: Analog
  • Direction: Omnidirectional
  • Frequency Range: 100Hz ~ 15KHz
  • Sensitivity: -43dB 5dB @ 94dB SPL
  • Signal-to-noise Ratio: 58dB

Shipping List

• FireBeetle Covers-Camera & Audio Media Board (V1.0) 1
• OV7725 Camera 1
• 18pin-2.54mm Male Pin Header 2
• 18pin-2.54mm Female Pin Header 2