b'Circuit 1A:You can find LEDs in just about any source of light, from the bulbs lighting your home Blinking an LED to the tiny status lights flashing on your home electronics. Blinking an LED is the classic starting point for learning how to program embedded electronics. Its the Hello, World! of microcontrollers. In this circuit, youll write code that makes an LED blink on and off.YOU LED330RESISTOR2 JUMPER WIRESNEEDNEW COMPONENTS NEW CONCEPTSLIGHT-EMITTING DIODES (LEDS)10k POLARITY: Many electronics 100k330are small lights made from a silicon diode.components have polarity, They come in different colors, brightnessesmeaning electricity can (and and sizes. LEDs (pronounced el-ee-dees)should) flow through them in have a positive (+) leg and a negative (-)only one direction. Polarized +leg, and they will only let electricity flowcomponents, like an LED, have a through them in one direction. LEDs canpositive and a negative leg and also burn out if too much electricity flowsonly work when electricity flows through them, so you should always use athrough them in one direction. resistor to limit the current when you wireSome components, like resistors, an LED into a circuit. do not have polarity; electricity can flow through them in either direction.OHMS LAW describes the relationship between the three fundamental elements of electricity: voltage, resistance and current. This relationship can be represented by this equation:V=IRRESISTORS resist the flow of electricity.V = Voltage in voltsYou can use them to protect sensitiveI = Current in ampscomponents like LEDs. The strength of a resistor (measured in ohms) is marked onR = Resistance in ohms ()the body of the resistor using small coloredThis equation is used to calculate what resistor bands. Each color stands for a number,values are suitable to sufficiently limit the current which you can look up using a resistor chart.flowing to the LED so that it does not get too hot One can be found at the back of this book.and burn out.13 : circuit 1a'