BotronikS - Final code for all types of Arduino and PC users: -- HOME -- email: botronik@gmail.com
What you need to install or have installed before on your PC: see HERE

Test1:

Test2:

 Tested with accessories: BME280 5V: Temperature + Humidity + Atmospheric Barometric Pressure + Altitude
PC+: Nano-Uno-Mega +: Note: ATmega328 SDA/SCL=A4/A5 - AtMega2560 SDA/SCL=SDA/SCL
BME280 5V: 1 - 2 - 3 For ArduinoIDE: Test1 - Test2
 
   
 

Test3:

Tested with accessories: BME280 5V: Temp+Humi+Pressure+Altitude+4out
PC+: Nano-Uno-Mega +: Note: ATmega328 SDA/SCL=A4/A5 - AtMega2560 SDA/SCL=SDA/SCL
BME280 5V: 1 - 2 - 3 For ArduinoIDE: Test3
Rel Shield: 1 - 2 - 3  
   
 

Test4:

Tested with accessories: BME280 5V: Temp+Humi+Pressure+Altitude+8out
PC+: Nano-Uno-Mega +: Note: ATmega328 SDA/SCL=A4/A5 - AtMega2560 SDA/SCL=SDA/SCL
BME280 5V: 1 - 2 - 3 For ArduinoIDE: Test4
Shield: 1 - 2 - 3