How to test the pins/ports of my Arduino Uno ?

Development Tools IDE 1.x
1

I recently bought an Arduino Uno board, and tested it with some simple projects.

Some projects didn't work out well, especially when they make use of the digital ports.

So I suspect there might be something wrong with these pins/ports, or I made some mistakes with the projects.

Is there a simple way to test all the digital in/out ports of my Arduino Uno board?

2

connect pin 3 to pin4
make one input the other output and see if they follow

then switch the inout and output and do the test again.

and do that for all pins.

see also - Loop-Back Test Instructions - Installation & Troubleshooting - Arduino Forum

(sinds kort trotse papa ?)

3

Perform the loop back test first.
Upload StandardFirmata included in the arduino IDE, Get a Windows 10 device, downlodl the "Remote Arduino Experience" app. Connect the arduino to Win10 device using USB or Bluetooth. If connecting via Bt,confirm that the BT module(as HC05) has baud rate 57600 selected. Folow the instructions in the app. You can test all pins with their PWM func in the app.
Regards,
-Malhar.