hello, i am powering arduino uno using Vin and GND pins. I am monitoring sensors values through analog pins of arduino uno. I am supplying 7-9 volts. My question is that if my input voltages changes (e.g 8 to 7) ,Will it affect my sensor readings?
If I read you correctly no would be the answer. If you look closely at your Arduino UNO board it should look like the below image:hello, i am powering arduino uno using Vin and GND pins. I am monitoring sensors values through analog pins of arduino uno. I am supplying 7-9 volts. My question is that if my input voltages changes (e.g 8 to 7) ,Will it affect my sensor readings?
No, I am powering the sensors through external power supply.If your sensors are running from the +5V generated by the Arduino, the readings should not change.
But if you are running the sensors from the Vin, they may. It does depend on what the sensors are and how they are wired.
You will need to submit FULL circuit info to get a better answer.
Now knowing that you have two power supplies, are their grounds connected together?No, I am powering the sensors through external power supply.
And that’s why I asked which of the two power supplies he is changing. It’s an important piece of data that’s unknown.What are the sensors?
If they derive their excitation relying on the supply voltage then the output may change with supply variations. So without the info on the sensors it is not a question that can be fully answered.
For instance, if you have an LDR running from an external voltage to an analog input then to gnd, if the external supply changes, so will the reading.
But usually, an I2C or OneWire sensor has its own internal regulator so that is ok.
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