PIC16F1827 connected to Android USB via OTG cable and UART to USB module. Controls 4 inputs, 4 outputs, and 2 analogue inputs. Switch 4 PIC outputs by the toggle switches and read 4 inputs by the 4 lights, read voltage of 2 analogue inputs. 10 bits analog is transmited in one byte of 7 LSB and another byte of 3 MSB. The Arduino update data every second.
The app is in free program Basic for Android (B4A) https://www.b4x.com/. Transfer APK file to your Android device and install the app by opening the file.
USB-UART can be bought from eBay: https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p3519243.m570.l1311&_nkw=usb+to+uart

PC connects to inputs and outputs of PIC16F628A displayed on Chrome browser. PIC inputs HIGH level displayed in green and input LOW level displayed in red. HTML file includes javascript.
Browser can be Chrome, Edge and Opera browsers https://developer.chrome.com/en/articles/serial/#browser-support . Run the PIC connected to PC, open file web_io_628.html in the browser and click Connect.
USB to UART adapter can be bought from eBay: https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p3519243.m570.l1311&_nkw=usb+to+uart

Using PIC18F2550 for connecting analogue and digital signals to USB port . Included 4 app codes and 3 PIC codes: Visual Basic 6 code, VS2005 C++ , VB2010 code and C# codes are based on Microchip code, PIC ASM code, PIC C code for C18 and MPLABX code for XC8. Any app code works with every PIC code. The PIC microcontroller has 10 bit analogue to digital converter. The circuit is powered by the USB. The interface to the PC is HID class.
The inputs and outputs are updated every 10ms.
HID class (human interface device) is a class of devices like the mouse and the keyboard, the data transfer rate is limited to 64KB/S. The PC already has a driver for HID USB.
VB6 code includes guidance to setting up the PC. The PC register the PID and VID (product ID) of the USB device when it's plugged, the VB code uses these ID's to communicate with the device. For commercial VID it is needed to buy it from USB-IF, but in your lab you can use any number.
The source code is derived from freeware from these sources: http://janaxelson.com/usb.htm , http://openprog.altervista.org/USB_firm_eng.html

Using PC to connect to Arduino Uno. Included Visual Basic 6 code and arduino code. The VB6 may need an ActiveX file downloaded from Microsoft.
The VB app connects to the Arduino via the COM PORT that the USB drive created and connects the Arduino IDE, when the VB app is running you cannot program the Arduino. You need to enter to the VB app the port number in the way it is done with the IDE.
The app displays 4 analogue inputs A0-A3, 6 digital inputs D2-D7 and 6 digital outputs D8-D13
Code and app for PC Visual Studio 2010 can be downloaded from GitHub:  https://github.com/projects22/Arduino-Input-Outputs-to-PC  app setup is in usb io/publish
You are free to use the Arduino code and the VB software with no limitations.

Using PC to connect to Arduino inputs and outputs. Digital inputs D2-D5 and digital outputs D6-D9. Arduino inputs HIGH level displayed in green and input LOW level displayed in red. HTML file includes javascript.
The temperature can be displayed in Chrome, Edge and Opera browsers https://developer.chrome.com/en/articles/serial/#browser-support . Run the Arduino connected to PC, open file web_io.html in the browser and click Connect.

You are free to use the Arduino code and the VB software with no limitations.

Arduino connected to Android USB via OTG cable, controls 4 inputs, 4 outputs, analogue inputs and temperature sensor DS21B20. Switch 4 Arduino outputs by the toggle switches and read 4 inputs by the 4 lights, read voltage of 2 analogue inputs. The Arduino update data every second.
The app is in free program Basic for Android (B4A) https://www.b4x.com/. Transfer APK file to your Android device and install the app by opening the file.

Arduino connected to Android USB via HC-05 Bluetooth module, controls 4 inputs, 4 outputs, analogue inputs, temperature sensor and analogue output (PWM). Switch 4 Arduino outputs by the toggle switches and read 4 inputs by the 4 lights, read voltage of 2 analogue inputs. The Arduino update data every second.
The app is in free program Basic for Android (B4A) https://www.b4x.com/. Transfer APK file to your Android device and install the app by opening the file.