The Grove expansion board with ext. Flash & Nrf52840 and more.
This is a quick video of the Grove Expansion board from seeed studio fitted with the external Flash chip (W25Q80DV) 8Mbit Running a Test on both onboard QSPI Flash and The added External SPI Flash. I 3D printed the case too and added the cheapest display on the Al-Gore network, the push button shows the SLEEP interrupt and low power mode as well as WAKE-UP.