If you can put a relay output on it then you could wire one of the UR inputs to that relay and then by using the relay you can then signal the UR input
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So I decided to use a raspberry pi instead, I was having trouble with connecting the Arduino uno to wifi. I am going to use the blynk app to have one of the GPIO pins give an output signal that will then activate the relay and so give a digital input to the UR3. Does this sound right?