+ This test page gives control over the BBB's pins. - Select a pin that you wish to use from the relevant drop-down - menu and click 'Go'.
-A new widget will appear with controls relevant to that pin.
-Make sure to check the error log to see if something goes wrong.
-To see the pin out diagram of the BBB, click here.
+| - GPIO - - | -- PWM - - | -
-
+
- Home +
- Experiment control +
- Experiment graphs +
- Experiment data +
- Pin debugging +
- Help +
This test page gives control over the BBB's pins. + Select a pin that you wish to use from the relevant drop-down + menu and click 'Go'.
+A new widget will appear with controls relevant to that pin.
+Make sure to check the error log to see if something goes wrong.
+To see the pin out diagram of the BBB, click here.
++ To export/unexport a pin means to enable/disable it. Apart from the obvious + use case, sometimes this can be required if you use two PWM channels + that share the same frequency base. +
++ You won't be able to change + the frequency until you unexport one of them. +
+The frequency must be a decimal number greater than 0.
++ The duty cycle describes the proportion of off/on time per period. + This number is specified as a ratio, with values ranging from 0 to 1. +
++ The polarity determines if the duty represents the 'active + high' or 'active low' portion. By default, the duty cycle + represents the 'active high' portion. +
+