Blog

Rock node Components Circuit

Circuit schematic for the Listed Materials:
Rock Node 3d Design download: 👉 link here
Solar Panel (5 W recommended): 👉 link here
4 × 18650 batteries: 👉 link here
Seeed Studio XIAO nRF52840: 👉 link here
Wio SX1262 LoRa board: 👉 link here
3 dBi antenna: 👉 link here
Battery protect module: 👉 link here
MPPT solar charge module:👉 link here (a lot cheaper on Aliexpress if you can wait for them): 👉 link here
Vent plug for electrical enclosures (if using): 👉 link here

Inside the Rock Node Repeaters

Up to now, I’ve been getting good results using Seeed XIAO nRF52840 boards powered by four 18650 cells wired in parallel. The cells feed through a battery protection board, which then supplies the nRF board.

I’ve since learned that the solar charge controller (MPPT) wiring shown in the photo above—while seemingly correct—has been causing issues. The MPPT output should be connected directly to the P+ and P− terminals on the battery protection board, rather than the batteries direct.