I want to measure current using the MAX471 sensor that outputs voltage proportional to the current (1V/A according to the datasheet). To test the module, I connected a 330 ohm resistor to the sensor and powered it from 3.3V arduino. Using ohms law, I was expecting an output voltage of around 10 mV (for ~ 10 mA) in my circuit. However, I am getting an output of around 2.17 volts which seems wrong.

Does anyone see any mistake in my circuit or how I am trying to measure the current?

Here is my circuit:

My Code:

#include <Arduino.h> void setup() { Serial.begin(115200); } void loop() { int adc_val = analogRead(35); float vol = 3.2 / 4095 * adc_val; // using a 12 bit adc Serial.println(vol); delay(3000); } 

I want to measure current using the MAX471 sensor that outputs voltage proportional to the current (1V/A according to the datasheet). To test the module, I connected a 330 ohm resistor to the sensor and powered it from 3.3V arduino. Using ohms law, I was expecting an output voltage of around 10 mV (for ~ 10 mA) in my circuit. However, I am getting an output of around 2.17 volts which seems wrong.

Does anyone see any mistake in my circuit or how I am trying to measure the current?

Here is my circuit:

My Code:

#include <Arduino.h> void setup() { Serial.begin(115200); } void loop() { int adc_val = analogRead(A5); float vol = 3.2 / 4095 * adc_val; // using a 12 bit adc Serial.println(vol); delay(3000); }