Hello Pieter,
Ive connected the D0 (GPIO16 for arduino) to the RST pin. The battery is connected to the 5V pin and the GND.
The sensors are connected D1 and D2.
As far as i can see nothing is connected to the GPIO0, GPIO2 or GPIO15.
I also have an another strange thing because the A0 is not reading out any analog data from the battery. If the battery is connected or not it always says 1 (sometimes 2)
Did i answer your question.