Troubleshooting: Arduino Pro Mini & USB Host Shield Keyboard Input

'Can't seem to get my USB host shield to work on my Pro Mini' and 'can't get it to show any keyboard input on the serial terminal.' This suggests they need some technical help and a practical solution. A detailed troubleshooting guide—whether it's a webpage, document, or video tutorial—specifically for using a USB Host Shield Mini with an Arduino Pro Mini for keyboard input would be really helpful. The guide should cover common issues and solutions, such as:

• Correct wiring configurations between the Pro Mini and the USB Host Shield Mini.
• Adequate power supply considerations for both the Arduino and the connected USB keyboard.
• Proper selection and integration of compatible USB Host libraries, addressing potential memory or processing limitations of the Pro Mini.
• Correct serial communication setup for debugging and viewing output, including Serial.begin() and baud rate matching.
• A step-by-step walkthrough of a working example sketch (like USBHIDBootKbd or a simplified version) tailored for this specific hardware combination.

This would help electronics hobbyists overcome a specific, common, and frustrating technical challenge, enabling them to complete their projects.