Another pin you can use on the Nano to power it up is the 5V pin (located on Pin 27, close to the VIN pin at the end of the board). This pin mostly serves as a power output pin that supplies power ...

And even with ratiometric sensors, point in case: You have a sensor with a full range response from 10-90% of Vin. The sensor consumes 1.5 milliamps from source.

The chips on the Arduino Uno cost around $4 USD and can be removed with a IC puller, then you can connect the Arduino’s RX/TX to the IC’s TX/RX, and then connect the reset pins as RST->RST ...