Update mdb2pi-hat.md
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#MDB2Pi HAT
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The MDB2Pi HAT can serve as an MDB master or as a peripheral MDB Device for Vending Machines (VMC). It takes care of the MDB specific 9-bit format, electrical and timing constraints. It forwards the MDB payload to the Raspberry Pi UART using a simple serial protocol.
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The MDB2Pi HAT can serve as a MDB master or as a peripheral MDB Device for Vending Machines (VMC). It takes care of the MDB specific 9-bit format, electrical and timing constraints. It forwards the MDB payload to the Raspberry Pi UART using a simple serial protocol.
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The MDB2Pi HAT is powered from the MDB bus (10...42V regulated or unregulated supply) and backpowers the Raspberry Pi with up to 2.5A@5V. Thus no separate power supply is required for the pi.
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##Configuration
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dtparam=i2c_vc=on
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```
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2. disable serial console output by editing :
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2. disable serial console output:
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```bash
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sudo nano /boot/cmdline.txt
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```
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--> remove the "console=..." parameter
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##MDB Master and Cashless Device Demo:
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Prerequisites:
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1. Install mono runtime:
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```bash
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sudo apt-get install mono-runtime
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