TimerOne kidnapped my interrupt port

Projects Programming
3

My code has changed about 10 times since I had a working interrupt with the IR photodiode. It originally had a simple counter that printed every 100 times it triggered the interrupt. That worked great. I added the timer and the IR counter stopped working. So, this code is a summary of the key pieces:

#include <TimerOne.h>

int count = 0;
float time = 0.0;
int runCalc = 0;

void counter() {
  count++;
}

void stepTime() {
  time += 0.2;
  runCalc = 1;
}

void calc() {
  const int tab = 9;
  Serial.print(time);
  Serial.write(tab);
  Serial.println(count);
  count = 0;
  runCalc = 0;
}

void setup() {
  Serial.begin(9600);

  Timer1.initialize(200000); // set a timer to 5 Hertz
  Timer1.attachInterrupt(stepTime);
  
  attachInterrupt(0, counter, FALLING);
}

void loop() {
  if (runCalc) calc();
}