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The client has made the following changes to the job.
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The client prefers freelancers from
a different location.
What I need or require:
To develop a low-cost USB based tire pressure probe. The probe must appear as a HID-Keyboard device when plugged into a computer.
The sensor selected should be capable of measuring from 2 to 150 psi with an accuracy of 2.5% full scale (as per ANSI B40.1 Grade B). If possible, the sensor should compensate for temperature.
The microcontroller should be selected in order to minimize the parts count in the circuit. The
The probe should output the text value of a pressure measurement once per second to the nearest 0.5 psi and then finish the transmission with a carriage return.
As an example, opening notepad, plugging in the probe and applying 31.5 psi should result in the following output:
What I already have versus what the provider will deliver:
The provider will provide a schematic diagram of the circuit, a detailed parts list, preliminary PCB layout and all microcontroller code (programming should be done in C).
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