Great small board for solar harvesting. I'm using this board in some of my LoRaWAN projects. Even with the cheapest shipping method, the board arrives within a few days. Last order was made on a Sunday and was delivered on Friday in Switzerland.
Very well made device! As advertised, it's even able to harvest solar power indoors. As a learner it has made efficient solar harvesting much simpler and I'm looking forward to trying some ideas out for it. My purchase was lost or delayed so Jasper very kindly and very quickly sent me another one free of charge!
Highly recommend if you're looking to efficiently harvest solar power with li-on caps :) Thanks Jasper!
Response from Jasper Sikken | May 22, 2021
Thank you for 5 stars! I made the silly mistake not writing the city on the envelope. Ofcourse I resend another one free of charge. Thanks Craig
Everything was perfect! I regret to say that due a error made by ME I was only able to use the board for 3 days. I disassembled my fist circuit in the proto board to check the battery voltage and then I mistakenly inverted where was the place of the battery with the place of the solar painel, conclusion, the board chip died and also the battery. Funny and sad at the same time, LOL.
I combined the supercap version with a Feather M0 Lora (samd21). I removed both the LDO and LiPo charger IC and power it directly on the 3.3V pin. I'm running it in sleep mode most of the time, and just transmit a temperature update every 5 minutes. I was a bit concerned that the intial Lora netwerk join (OTAA) ping-pong traffic might drain my supercaps before it could enter sleep mode. Luckily, it works very well. My small 4V 70mm x 70mm solar panel, placed near a window facing the outside, seems to be more than enough. I think it would even allow the feather to spend less time sleeping. Great product.
Response from Jasper Sikken | June 23, 2020
I am happy it works well for you. Did you know that if you put two supercaps in series the total capacitance is 50% of the single supercaps. Because 1/Ctotal=1/C1 + 1/C2