Hi all.. been looking through the forum and seen many ways that show certain setups of Raspberrypints. I have so far spent many hours trying to setup Raspberrypints with flowmeters. I have installed Buster on Pi3 all working ok.... Then enter Raspberrypints into terminal window. (RandR+ version). All goes in correctly. I have set up Arduino Mega 2560 with altered in file. ie changed baud rate to 57600.. and also set pins as required. 8,9,10,11. I have also gone through steps as stated to link the Pi3 to recognise the Arduino but doesn't seem to link up. Via the Arduino IDE menu to Serial Monitor the flowmeters are working and the Arduino is working.. Can anyone give a walk through of how to link the Pi3 and Arduino. I have tried many suggestions from this forum but to no avail. I have setup the Raspberrypints ie pin in Taps and pulses per liter together with going through all the personalization settings. Thanks all any help appreciated.. not a novice but not an expert somewhere in the middle.