I have planning and testing for a long time, for the best solution for the wireless sensor. And im almost ready for the final.
The sensor will have both wireless and cable mode, so it’s possible to use both ways. The wireless sensors will run on 9v battery.
I also made a huge modification on the main system. Upgraded from Arduino UNO to an Arduino Mega. There is now an bigger LCD (20×4) and added an SD card module so i can store best time and other stuff like that.