How energy flows in STEVAL-HARVEST1

[SaiVenkat]

Are there any more resources to understand how to use STEVAL-HARVEST1, how does the energy flow from super capacitors to the MCU and also the back up capacitors. I feel few things are missing the schematic and the user guide. I want to first implement a small UART program with energy harvesting. Can anyone guide through steps in achieving it.

How to connect this to board, does it mean I need to add any external wire from harvester solar panel and short it here?

I have read 
https://www.st.com/resource/en/user_manual/um3539-getting-started-with-stevalharvest1-energy-harvesting-board-for-nucleowl55-stmicroelectronics.pdf
https://www.st.com/resource/en/schematic_pack/steval-harvest1-schematic.pdf
https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=11369460

Thanks in advance.

[SaiVenkat]

The “positive terminal” simply means the positive supply node of the harvested energy path. 

Does it mean I need to sort any points. Like VDD with VEH or VPV?

[Peter BENSCH]

@SaiVenkat 
I have looked at your photos again. You have largely made the changes described in UM3539 and also soldered the two-pin header at JP9, but you missed one small detail: the jumper must not connect JP9.1 and JP9.2 as in your photo, but, as shown in UM3539, fig. 11, it should connect JP1.2 and JP2.2, i.e. VDD_MCU with VDD_APP. In the MB1359 schematics, page 8, this is shown more clearly: JP1.1 and JP9.1 are on the left there, while you need to connect the two right-hand pins 2 of JP1/JP9.

Regards
/Peter

[SaiVenkat]

Thank you for your response @Peter BENSCH . I tried this but the voltage across VDD is not increasing.

@Peter BENSCH @Andrew Neil , Can you just clear me one thing nothing else. Where does VPV power goes first. As per my knowledge from the STM32WL55 schematic and steval harvest1 schematic , VPV is connected to nothing on CN7.

                                                   STM32WL55 CN7 Pin 2 connected to nothing

                                                  STEVAL_HARVEST_1 CN7 Pin 2 connected to nothing

 With VPV not connected to anything how does anything charges or power flows anywhere

[Peter BENSCH]

I do not currently have access to the kit, but in UM3539 a jumper appears to be missing on the NUCLEO-WL55JC1 between CN7.1 and CN7.2. If fitted, this jumper on the STEVAL-HARVEST1 connects the VPV line to VDD, which is then routed via CN7.5 to the NUCLEO-WL55JC1 at VDD_MCU. You can simply plug the jumper onto the NUCLEO from below.

Hope that helps?

Regards
/Peter