#include <Arduino.h>

const uint8_t PIN_PWR = 15;

float r1 = 10.0f;
float r2 = 10.0f;
float r3 = 10.0f;

float r2r3 = r2 + r3;

float rE = 1 / ((1 / r1) + (1 / r2r3));


void setup() {
  Serial.begin(115200);

  pinMode(A0, INPUT);

  pinMode(PIN_PWR, OUTPUT);
  digitalWrite(PIN_PWR, 1);
}

void loop() {
  float sample = analogRead(A0) * 3.0f / 1.1f;
  Serial.printf("Voltage = %.0f mV\n", sample);

  float deltaV = (3.3f * 1000) - sample;
  float current = deltaV / rE;
  Serial.printf("Current = %.0f mA\n", current);

  float power = deltaV * current / 1000;
  Serial.printf("Power = %.0f mW\n", power);


  delay(2000);
}