Projet arduino photoresistance et led how to#
Projet arduino photoresistance et led code#

Projet arduino photoresistance et led code#

What is the color code for a 5% 220Ω resistor?.Highlight the text below to see the answer What is the color code for a 5% 1.0KΩ resistor?.

Remember: Just because the stripes are in a certain order doesn't mean the resistor has a direction! Resistors are the same forward and backwards, it doesnt matter which way they are used. There are also website calculators that you may find very handy ( Or you can use a multimeter to measure the resistance accurately)Ĭlick here to view a reference chart that you can print out (in color) and use as your guide. Eventually you'll get really good at telling the value of a resistor just by glance but to start off you'll want to use a reference chart. This is known as the resistor color code, and its a real pain when you first start electronics. You'll have to read it by looking at the colored stripes on the body of the resistor.

Since the resistive element is inside a ceramic casing, its not possible to tell the resistance of a resistor just by looking at it. Most resistors you'll see range between 1 ohm and 1 megaohm (1.0 MΩ). The bigger the resistance value (in ohms) the more it fights. Resistance is measured in ohms, often written as the symbol Ω. If you mixed up the two pipe sizes, you wouldnt be able to put out a fire and you'd hurt yourself while trying to get a drink. With a water fountain, you'd want high resistance. Wth a fire hydrant, you want low resistance. Thin pipes let less water through (high resistance), thick pipes let a lot of water through (low resistance). One common way of thinking about this is if we were talking about water current, then pipes are like resistors. By resisting current they control where and how fast it flows. Resistors have one job to do, and that is to resist the flow of electricity (otherwise known as current). An electronic gadget, such as an mp3 player has easily a thousand resistors inside of it! The resistor is the most basic and also most common electronic part.

Projet arduino photoresistance et led how to#

However, after this lesson, you'll be more on your own to figure out how to connect up the standard breadboard, OK? In this lesson, we will show pictures of both the tiny breadboard on a protoshield and also using a 'standard' breadboard without a shield. The one on the right is quite small, it has only 17 row pairs and no rails. For example the breadboard on the left has 30 row pairs and 2 sets of double rails on either side. Breadboards are almost always made so that they have two sets of 5-hole rows and on either side there are a pair of rails. The long columns are called rails and the short strips are called rows. There are short ones that connect 5 row holes at a time, and then there are very long ones that connect 25 (or more!) column holes at a time. In the images above you can see how there are two kinds of metal strips.

The metal strips are springy so that when you poke a wire into the hole, the clips grab onto it. However, something special is going on inside the breadboard! Although you can't see it, inside the breadboard are many strips of metal that connect the rows and columns together. They often look like thisīasically, a chunk of plastic with a bunch of holes. You can pick on up at any hobby shop or electronics supply store. They allow you to make quick circuits, test out ideas before making a more permanent Printed Circuit Board. Solderless breadboards are an important tool in your quest for electronics mastery.