Wiki VMAC PiHat Specification

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VMAC PiHat v1
VMAC PiHat v2

The HAMKit VMAC AV PiHat v1, is a small board which provides a very flexible Audio and Video Switching Matrix, with on-board DTMF Decoder, EEPROM and DC Regulator.

This board (available as a kit or built), was designed principally as a Raspberry Pi add-on board, however, it can also be connected to other I2C enabled devices such as Arduino, Microchip, Tablets or PC.

As the current consumption is very low, power is taken from the Raspberry Pi 3V3, via the GPIO header.

Various sample test code provided on our Wiki pages, using Python.

  • Full size quality two layer Raspberry Pi Hat board to HAT mechanical specification
  • Size 85mm x 56mm
  • Weight: PCB with connectors 40g, PCB without connectors 20g
  • Standard 40 pin Pi GPIO header
  • All logic I/O levels are at 3v3
  • Impedance Video 75 Ohms and Audio 600 Ohms (Line Level)
  • Video input Clamp, Bias and Programmable Gain
  • 7 x AV Inputs
    • 6 x RCA Sockets – Component configurable for Video or Audio Inputs
    • 1 x 3.5mm Jack Socket providing 1 x video and 2 x audio Inputs
      • Used to loopback from Pi 2 or 3, 3.5mm Socket
  • 4 x AV Outputs
    • 4 x RCA Sockets – Component configurable for Video or Audio Outputs
  • Pi Zero video connector Pin Header
  • 4 x matrix logic control inputs
    • Connected to GPIO on Pi GPIO header
  • FET switched output
    • Connected via GPIO on Pi GPIO header
  • DC 6.5v to 27v input to 5v regulator
    • To power Pi via Pi GPIO header. Recommend a small heatsink on the regulator if using for long periods.
  • PiHat powered from Pi via Pi GPIO header 3v3
  • DTMF decoder
    • Logic outputs to GPIO on Pi GPIO header
  • EEPROM
    • Connected to E2 ID on Pi GPIO header
  • UART TXD, RXD and RTS
    • Connected to GPIO on Pi GPIO header
  • Two PiHat boards can be stacked for increased A/V IO
    • Require to unpopulate DTMF and E2 IC’s on 2nd board
    • Change matrix i2c address via solder jumper
  • Mounting holes
    • Suitable for Raspberry PI 2, 3 or Zero risers
  • Operating Temperature -40°C to 85°C

 

 

 

 



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