Source device detection

A system comprising:

• an input port having an associated conductive element, the input port being configured to receive a +5V HDMI connector for an HDMI source device;
• a voltage divider circuit across the associated conductive element;
• a signal source device configured to provide an electrical signal to the voltage divider circuit that is across the associated conductive element;
• a voltage measurer configured to measure voltages of the voltage divider circuit at the associated conductive element;
• a determination component configured to determine a presence state of HDMI source devices based on the voltage of the voltage divider circuit;
• and
• a circuit switch electrically coupled between the signal source device and the voltage divider circuit, the circuit switch being configured to:
• open and close based on an activation signal from the determination component;
• and
• allow the voltage measurer to measure at least two different voltages of the voltage divider circuit that are based on the electrical signal and on the absence of the electrical signal;
• the determination component also configured to:
• determine the presence state as being indicative of an HDMI source device being present and being powered on based on a voltage value measured by the voltage measurer when the circuit switch is open.

A system comprising:

• a voltage divider circuit across a conductor of a +5V connector of an HDMI port;
• and
• a determination component configured to:
• determine a presence state from a plurality of presence states for HDMI source devices associated with the system based on a measured divided voltage of the voltage divider circuit at the conductor, including being configured to:
• determine the presence state as indicative of an HDMI source device being present based on the measured divided voltage being less than, or less than or equal to, approximately 0.5V for a voltage between approximately 3V and 5V being supplied to the voltage divider circuit;
• and
• determine the presence state as indicative of an HDMI source device not being present based on the measured divided voltage being greater than, or greater than or equal to, approximately 4V for the voltage between approximately 3V and 5V being supplied to the voltage divider circuit.