The GPIO driver for potentiometers is used to detect the voltage level of an analog signal on a selected pin. The selected pin gets a granularity assigned which determines at what minimum change the Central Core gets notified.
The GPIO driver for potentiometers has two parameter that have to be configured:
This is the pin reading the input voltage, any of the GP pins is suitable for this selection if not already used for other drivers.
This is the minimum change from the last notifications value that would trigger sending another notification to the Central Core. This helps us to only wake up and notify when the application specific threshold has been passed. Important values:
The Potentiometer range: 0-4095 (12 bit)
The Granularity range: 2-200
The GP0 pin is connected to a potentiometer which is acting as a voltage divider in this case. The resistance does not really matter unless it is in the higher range (>10000Ω) to keep the current flow low.
GP0 (can be any GP pin)
This pin reads the analog value given by the potentiometer
This pin provides the high level
This pin provides the low level
How to write an App
Navigate to the App Builder and create a new application. You can find the “Potentiometer” code object under the “Hardware” Tab in the object drop down menu on the left, or you can also use the search bar.
Drag the “Potentiometer” Object onto the canvas.
Next, locate the “Text” object under the “Interface” tab and drag it onto the canvas.
Finally, connect the “State” port from the Potentiometer Object to the “In” port on the Text Object and save your application.
How to create a firmware
Navigate to the Firmware Builder and create a new firmware file.
Click the “+ Add Hardware” button which will open a modal window. Scroll down in the list to find the “Generic” section and select the “Potentiometer” hardware option.
Give your device a name and click “Add Device”
Next, select the “GPIO” driver under the driver dropdown menu and set the Pin and the Granularity
For this example we select:
You may now save your firmware file and upload it to one of your Builder Bases