Upgraded the wireless sender with new microcontroller.
The old one was an Arduino Nano (blue) and the new one is ESP32 (black)
ESP32 has a lot more memory, is much faster, has built in wifi and bluetooth and sd-card reader
The only extra thing in the box is a voltage converter to feed the microcontroller and display from the DeWalt battery
USB-port for uploading new program and SD-card (for future functions) is accessible from outside
And as I was at it, I made three
They are identical except for their "device name", sender 1, 2 and 3
and can be used independent or all at the same time, there is no master or slave.
When startpicture shows it is connected to the mqtt broker
Everything else works the same, for now. There will be more functions later on.
Tested and working fine
Now summer is knocking on my door and a lot of work is waiting outdoors