I decided to build a new design because I’m afraid that the solar cells are not going to be powerful enough. I’m going to use 50F 2,7V capacitors instead of batteries in the new design. After the capacitors I placed a dc-dc converter.
The pcb with the capacitors and the dc-dc converter is now ready, the converter is based on a MAX1676 with an external diode to work at an even lower input voltage.
I mounted some zenerdiode’s on the bottom side of the pcb to protect the capacitors from overcharging.
Circuit:
PCB:
Pictures:
The main print will also get a new version. That will be based on a PIC16LF1827, this pic has nanoWatt XLP onboard so it uses very little power. The sensor’s also will be connected differently so they consume less power. More info about this will follow later.
Dutch 
