Hmm, relay should have started now :/ the balloon might had been a bit overfilled and it might have bursted at sunrise, but we will see.
For information I have fitted a 3-Pin Microprocessor Reset Monitors (MAX809 2.93V version) to keep the microcontroller at reset state until the voltage on the cells came over 3V , the board was powered with 6x 52x26 cells direct to vcc.
I had cut of the bottom part of the pcb to save some weight.
https://imgur.com/AVujmWl
For information I have fitted a 3-Pin Microprocessor Reset Monitors (MAX809 2.93V version) to keep the microcontroller at reset state until the voltage on the cells came over 3V , the board was powered with 6x 52x26 cells direct to vcc.
I had cut of the bottom part of the pcb to save some weight.
https://imgur.com/AVujmWl