使用Raspberry Pi 2b GPIO引脚检查电压

Question

I want to build a simple (game)controller for my raspberry pi 2b. My plan is to connect the 3.3 voltage output to a button and than to whatever GPIO pin.

Is it possible to check for voltage with the GPIO pin? Or are there more smoother ways to build one (Analog to Digital)?

Please respect that I am developing in Visual Studio 2015 C# and my RP-OS is Windows 10.

Answer 1

You can read the status of the pin (High/Low) or you can use interrupts to receive events when the status changes.

The button and LED project is the very first examples either on the Raspberry Pi site or Windows IoT site . The PushButton sample for C# uses interrupts to detect status changes.

The OS or language doesn't matter so much as the fact that you are using an RPi. In order to work with a pin, you need to open it, set its mode and then, either retrieve its value periodically ,or listen to an interrupt.

In the sample, the following steps are taken:

• Open the button pin: buttonPin = gpio.OpenPin(BUTTON_PIN);
• Set it as input: buttonPin.SetDriveMode(GpioPinDriveMode.InputPullUp) ;
• Listen to the interrupt with an event handler: buttonPin.ValueChanged += buttonPin_ValueChanged;

Generally speaking, you should work with both Raspbian and Windows IoT to understand how RPi behaves:

• Windows IoT doesn't yet support RPi's full functionality yet so there are things that are far easier to do with Raspbian than Windows IoT, eg using temperature sensors or any device with 1-Wire support.
• Sensor manufacturers provide samples, code and even libraries for Rapsbian or Arduino. Getting the sensor to work is hard enough, you shouldn't have to translate from Raspbian to Windows IoT as well.