README and upload code

README.md

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 # Ringulator
-Coil and transformer tester and ring detector
+Arduino Coil and transformer tester and ring detector
+
+## Requirements
+Display: Default is the 'Seed Grove-LCD RGB Backlight' since one was on hand, other LCD and 7seg LED displays can be substituted
+
+MPU: Tested with Atmega 328 (Uno) @16MHz
+
+Analog frontend: danyk wrote a short article and video with details, and provided some inspiration. http://danyk.cz

Ringulator.ino

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+/*
+   GPL LICENSE v3.0
+
+   Atmega 328 Coil Tester
+   https://youtu.be/QBbEYYWiBI8
+
+   Nov 2021 The Lightning Stalker
+*/
+
+#include <Wire.h>
+#include "rgb_lcd.h"
+
+#define BD 40            // display brightness
+
+#define pinModeInp(pin) DDRD = DDRD & ~(1 << pin) // equivalent to pinMode(thisPin, INPUT)
+#define pinModeOut(pin) DDRD = DDRD | (1 << pin)  // likewise but for OUTPUT
+
+rgb_lcd lcd;             // instantiate lcd variable
+
+const byte inputPin = 2; // must be an interrupt capable pin
+const byte pulsePin = 3; // pin going to transistor
+volatile byte count = 0; // interrupt driven counter variable
+
+void setup() {
+  // put your setup code here, to run once:
+  pinModeInp(inputPin); // saves 112kb over pinMode()! (?)
+  pinModeOut(pulsePin);
+
+  attachInterrupt(digitalPinToInterrupt(inputPin), updateCounter, RISING); // set up ISR
+
+  lcd.begin(16, 2); // 16 character, 2 line display
+  lcd.setRGB(BD, BD, BD); // reduce brightness
+
+  // Uncomment here and below for serial output:
+  /*  Serial.begin(9600);
+    while (!Serial) {
+      ; // wait for serial port to connect. Needed for native USB port only
+    }
+  */
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  digitalWrite(pulsePin, LOW); // charge capacitor
+  delay(110);
+  count = 0;                   // take erasurement
+  digitalWrite(pulsePin, HIGH);
+  delay(266);
+
+  //  Serial.println(count);
+  lcd.clear();
+  if (count <= 0) {
+    lcd.print("Ringulator v1.0");
+    lcd.setCursor(0, 1);
+    lcd.print("Listening...");
+  }
+  else {
+    lcd.setCursor(3, 0);
+    if (count < 100) lcd.print(' '); // padding of the numerinos
+    if (count < 10) lcd.print(' ');
+    lcd.print(count);
+    lcd.print(" Rings");
+  }
+}
+
+void updateCounter() {
+  // interrupt service routine:
+  count++;
+}

Ringulator.ino.hex

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