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  1. Analog Discovery 2 I am looking for a device with which 1. I can monitor 40 digital channels at the same time. The sampling rate is less than 40 Hz. 2. In addition to that I want to be able to also generate a desired signal for these 40 channels that I can feed back to my main board (to test it). May I kindly ask if Analog Discovery 2 could achieve this. As i understand, this device has a limit of 16 digital I/0 channels. Would it be possible to buy a device which could do 40 channels and or could I connect 3 such devices in such a way that the above mentioned aim can be achieved ? Thanks to all for your kind feedback !