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I'm using the FRC Gamepad Tool to load the TI-supplied firmware for a USD HID joystick with a KMA210 magnetic angle sensor. I have a voltage divider taking the KMA210's 5V max output to 3.3V, and when plugging in the MSP and checking the windows game controllers, an axis does respond when I turn a magnet near the sensor, but the reading is all over the place. Bouncing back and forth by 40% of the whole angle range. I've tried using an external 5V supply, tried changing the sampling on the ADC, the Vref, the clock multiplier, the wires, the input pin, just about everything.
Does anyone have any advice?
Hello Evan,
Thank you for your post. Did you happen to calibrate the inputs? If you do not connect the spare analog inputs to a voltage during calibration (so called ‘floating’ inputs), the input will behave erratically. We recommend that you connect each unused analog input to ground and avoid using these in your code.
Regards,
James
MSP Customer Applications
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