Hello @cyberluke not without hardware modification, I think. While SPI uses some signals (SCK, MISO, MOSI) in parallel for all SPI slaves, there is one signal for each SPI slave so it can be selected. In other words if you stack multiple M020 USB modules (w/o hardware modification) all of them would share the same select signal and therefore react at the same time (which is not what you want.) Thanks Felix