Couple of things to check on. Serial out + ground are connected to the device you are sending to. You are possibly missing the ground. Second to check is decoupling caps on the circuit.
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Re: What happens when I connect my oscilloscope to a circuit
Couple of things to check on. Serial out + ground are connected to the device you are sending to. You are possibly missing the ground. Second to check is decoupling caps on the circuit.
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