hi everyone,
I'm new here so if I make a mistake, let me know (wrong topic or such) and don't come down hard on me please 
So. My problem is, it looks like Arduino Uno is inconsistent on reading the value of a simple toggle switch (I'm using something very similar to this thing I googled: "MTS-102-E1"). My configuration is super-simple: middle leg on toggle switch: 5V pin on arduino, one of the side legs: pin #2, and that's it.
I tried the 5V pin both without resistor and with a 1K Ohm one, no difference. The arduino is plugged in with USB to a desktop PC.
Please note I'm not playing with the switch. I plug things together, start the arduino and monitor debug logs on the COM port, that's it, I'm not touching anything.
The test code I'm running is:
const int kTOGGLE_SWITCH_PIN = 2;
const int kWRITE_SUM_AFTER_ITERATIONS = 100; //write a summery of right / false values after 'n' read iterations
int switchStatus = 0; //reading switch status into this int
int wrongRes = 0;Â //register for wrong reads
int rightRes = 0;Â //register for right ones
int iteration = 0; //iteration count
void setup() {
 Serial.begin(9600);
 pinMode(kTOGGLE_SWITCH_PIN, INPUT);
}
void loop() {
 switchStatus = digitalRead(kTOGGLE_SWITCH_PIN);
 if (switchStatus == 0) {
  rightRes++;
 } else {
  wrongRes++;
 }
 Serial.println("The Switch Status is: " + String(switchStatus));
 iteration++;
 delay(500);
 if (iteration == kWRITE_SUM_AFTER_ITERATIONS) {
  Serial.println("Switch value  OK: " + String(rightRes));
  Serial.println("Switch value ERROR: " + String(wrongRes));
  wrongRes = 0;
  rightRes = 0;
  iteration = 0;
  delay(2000);
 }
}
I let it run while I was registering to the forums and writing this message, here are the results:
Switch value OK: 62
Switch value ERROR: 38
And the rest of the runs:
74 / 26; 74 / 26; 76 / 24; 69 / 31; 100 / 0; 96 / 4; 88 / 12; 95 / 5; 75 / 25; 100 / 0; 78 / 22; 93 / 7; 92 / 8; 93 / 7; 100 / 0; 97 / 3
False reads tend to come in batches, 8-10 together, but sometimes a lonely false read pops in, then either nothing for a long time or a batch of 8-10 follows after 3-4 proper reads inbetween.
TBH I'm a little puzzled... My assumption is this should be some voltage mumbo-jumbo as if the switch is the other way around (i.e. I toggle it to ON / HIGH), no errors at all. But how can I make the reads consistently right even with trying to read 0 ("LOW") status?
Thanks for the help!