Automatic water level controller

Walnut Innovations Automatic Water Level Controller

An automatic WLC (water level controller) is an essential equipment in a Home. Societies where there is a common water supply often install WLC's but individual home users tend to ignore this useful instrument.

Day night Switches by Walnut Innovations

Let us learn how to use/ test/ install a Day-night switch. A Day night switch is also called a Light Sensitive Switch. The main use of this switch is to automatically turn any electric appliance/ mainly Light bulbs On when it is evening and Turn them Off in the morning. Such a gadget can be very useful at a place where you have such a requirement such a Advertizing Billboard, Godowns, Farms/ Farm Houses etc.

Switch bouncing and debouncing with Arduino

(click to enlarge)

This experiment is similar to the previous one. The components and the circuit are the same as that of this experiment of the Pull down resistor. In that experiment we used a momentary switch to momentarily turn on the LED. Whereas in today's experiment we will turn on the LED and keep it on until the button is pressed again. Hence it will work as a Toggle switch instead of a momentary switch. We can achieve this effect by making changes in the code that we upload on the Arduino's board.

We are going to to use the example program in Arduino's IDE
File - Examples - Digital - Debounce

But the name is strange!, it is not toggle or something similar. It is Debounce. What is de-bounce ? What is it that is bouncing in this circuit that we need to de-bounce? Let us try to understand that below.

Arduino Digital Button with Pullup and Pulldown resistors

click to enlarge
Let us learn how a Pushbutton works on an Arduino's board. We will program the Arduino so that It can send a signal to a LED whenever the push button is pressed.

We can make the LED turn on with the press of the button, and with some rearrangement of components and the program we can make the LED turn off when the button is pressed.

Control a Servo with a Pot

click to enlarge
Today we will learn how to control a RC Servo motor (9g) with a Linear Taper potentiometer 10 K and the Arduino Uno board.