wvmarle is correct. You list 3 of the four necessary pins. The missing pin (SS or CS in your link, connected to arduino UNO pin 9) is the key to your answer. Use two different UNO pins as CS or SS, each per device.
wvmarle is correct. You list 3 of the four necessary pins. The missing pin (SS or CS in your link, connected to arduino UNO pin 9) is the key to your answer. Use two different UNO pins as CS or SS, each per device.