Mr. C. john212

Retired math teacher and engineer.

john212 / L_Meter_Working.ino

Created July 19, 2016 04:15

Using An Arduino and a LM339 Comparator To Measure an Unknown Inductance

	/*
	Inductance Meter Using Arduino - by J. Cantlin July 2, 2014

	A coil of unknown inductance is connected in an LC crcuit. The
	Arduino "rings" the circuit with a PWM pulse from a digital output.
	The decaying sine wave from the LC circuit, i.e., tank circuit is
	sent to an LM339 comparator where it is converted to a square
	wave. The square wave is sent to the Arduino where the "pulseIN"
	fuction reades its with in microseconds and converts it to the
	resonant frequency of the LC circuit. With a known value of

john212 / index.html

Last active November 26, 2019 15:22

JS Bin Test// source https://jsbin.com/fesixo

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width">
	<title>JS Bin Test</title>
	</head>
	<body>
	<p>Testing export to Gist from JSBin</p>
	<script id="jsbin-javascript">

john212 / index.html

Created November 27, 2019 03:42

JS Bin // source https://jsbin.com/dodokeg

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width">
	<title>JS Bin</title>
	</head>
	<body>

	<script id="jsbin-javascript">

john212 / index.html

Created December 16, 2019 18:42

Arithmetic and Geometric Sequence and Series // source https://jsbin.com/jaxahix

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width">
	<title>Arithmetic and Geometric Sequence and Series</title>
	</head>
	<body>
	<P>A program that will identify and then solve Arithmetic and Geometric Sequences and Series<br>
	after the user inputs the first three terms, a desired unknown term to be calculated,<br>

john212 / triangle_ineq_th_r1.html

Last active February 10, 2020 20:01

Triangle Inequality Theorem and Triangle Classification

	<!doctype html>
	<html>
	<head>
	<meta charset="UTF-8">
	<title>Triangle Inequality Theorem and Triangle Classification</title>
	</head>
	<body>

	<h2>Triangle Inequality Theorem and Triangle Classification</h2>

john212 / pascals_triangle_r0a.html

Created January 22, 2020 22:17

Pascal's Triangle Coefficients

	<!doctype html>
	<html>
	<head>
	<meta charset="UTF-8">
	<title>Pascal's Triangle Coefficient Calculator</title>
	</head>
	<body>

	<h2>Pascal's Triangle Coefficient Calculator</h2>

john212 / infinite_series_for_sine.html

Created March 19, 2020 01:46

Infinite Series For Sine Function

	<!doctype html>
	<html>
	<head>
	<meta charset="UTF-8">
	<title>Infinite Series for the Sine Function</title>
	</head>
	<body>

	<h2>Infinite Series for the Sine Function</h2>