2022-07-13 13:42:19 +02:00
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v2
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==
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instead of an edge plug, the monitor connector is also a receptacle.
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this prevents the firewall from sticking out of the monitor too much, particularly when installed in tight spaces.
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it also allows to place the HDMI firewall inline even if you don't have access to the monitor's HDMI port.
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finally it also allows the board to be manufactured more easily.
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the programmer is now included in the firewall.
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this offers very easy copy of the EDID data.
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no need to use complex linux commands or stand-alone separate programmer.
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the programmer uses the embedded EEPROM and acts as I²C slave.
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a DIP switch allows to selectively block or forward interfaces.
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2022-06-20 13:30:26 +02:00
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v1
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==
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this version comes as dongle, which can directly be plugged in the monitor.
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2022-06-21 11:08:53 +02:00
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the impedance and length of the differential signal pairs are properly taken care of.
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2022-06-20 13:30:26 +02:00
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a breakable tab replaces the WP switch.
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pads are still present to override the disabled WP and 5V.
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2022-06-21 11:08:53 +02:00
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the shield is not connected to ground, which causes EEPROM read errors with cheap HDMI cables skimping on the ground wire (pin 17).
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the workaround is to scratch the solder mask near one of the HDMI receptacle shell tab and solder it.
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2022-06-20 12:07:05 +02:00
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v0
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==
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first working version.
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based on the design of the original research.
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the HDMI connectors are on opposite sides of the board to make the routing easy (the differential signals are straight lines).
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the impedance does not seem to by optimal, leading to EMF leakage (reported by the original researchers).
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