created basic main file for reading output from geiger counter

it converts the values to CPM

RadiationMapper.ino

@@ -0,0 +1,50 @@
+#define INPUT_PIN D6 //VIN PIN FOR GEIGER COUNTER
+#define MEASUREMENT_TIME_MS 60000 //MINUTE
+#define MAX_CPM 5000 //HOW MANY COUNTS TO STORE
+
+unsigned long counts[MAX_CPM];
+int last_index = -1;
+
+//CALLBACK WHEN RADIATION PARTICLE IS DETECTED
+void IRAM_ATTR increment_counts()
+{
+    counts[(++last_index) % MAX_CPM] = millis();
+}
+
+void setup()
+{
+    //INIT counts
+    for (int i = 0; i < MAX_CPM; i++) counts[i] = 0;
+
+    Serial.begin(9600);
+
+    //INIT PINS
+    pinMode(INPUT_PIN, INPUT);
+    attachInterrupt(digitalPinToInterrupt(INPUT_PIN), cb, FALLING);
+}
+
+int last_counts = -1;
+void loop()
+{
+    unsigned long current_millis = millis();
+    int current_counts = 0;
+
+    //COUNT
+    for (int i = 0; i < MAX_CPM; i++)
+    {
+        if (counts[i] == 0) continue;
+        if (current_millis - counts[i] >= MEASUREMENT_TIME_MS) //REMOVE COUNTS OLDER THAN MEASUREMENT_TIME_MS
+        {
+            counts[i] = 0;
+            continue;
+        }
+
+        current_counts++; //COUNT RECENT
+    }
+
+    if (last_counts != current_counts) //PRINT CPM IF CHANGED
+    {
+        last_counts = current_counts;
+        Serial.println(String(current_counts) + " CPM");
+    }
+}