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Re: 3V3 digital signal to the cRIO
I would say, if you have a two way connection with one direction per line, the RPi tx can be directly connected to the rx on the crio. However, you would need a resistor in the rx of the pi. Are you using i2C or SPI, etc? I use a 5v UART connection with my pi to access terminal via serial.
5v requires 2v5 to register a 1.
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