Robot Building for Beginners, Third Edition

CHAPTER 10 ■ LEDS A bond wire (also called a whisker) connects the die to the anode lead. The bond wire is very thin! With some ...

CHAPTER 10 ■ LEDS Because one wire is dedicated to each of the two LED colors, they can be enabled at the same time. This permit ...

CHAPTER 10 ■ LEDS Setting Up a Multimeter for Diode Testing On the multimeter, the black lead should be connected to the COM te ...

CHAPTER 10 ■ LEDS Interpreting LED Test Results If the multimeter display doesn’t change values when the LED is connected, it’s ...

CHAPTER 10 ■ LEDS If there isn’t a problem with the test setup, it could be that the LED is damaged. A diode voltage value below ...

CHAPTER 10 ■ LEDS Forward Voltage Drop The voltage value displayed on the meter is called the forward voltage drop. That is, if ...

CHAPTER 10 ■ LEDS The green, yellow, and red LEDs tend to be inexpensive. In fact, all of the colored LEDs combined cost less th ...

CHAPTER 11 Power On! Building and Testing a Power Indicator Circuit Nearly all robots need a power indicator light. It’s a very ...

CHAPTER 11 ■ POWER ON! Reading a Schematic A schematic illustrates the logical connections between all of the parts (see Figure  ...

CHAPTER 11 ■ POWER ON! Building the Power Indicator Circuit You’re now going to build the power indicator circuit by connecting ...

CHAPTER 11 ■ POWER ON! Do You See The Light? Hopefully you’re patting yourself on the back for a job well done. You’ve got a bea ...

CHAPTER 11 ■ POWER ON! Measuring In-Circuit Voltage Testing voltages throughout a circuit is the most common test you’ll perform ...

CHAPTER 11 ■ POWER ON! When you touch the red test probe tip to the positive terminal of the battery, the multimeter should ind ...

CHAPTER 11 ■ POWER ON! Measuring Voltage “Drop” or Voltage “Across” a Part Often you’ll be interested in how much voltage a part ...

CHAPTER 11 ■ POWER ON! In an earlier chapter, you tested the LED using the diode mode of the multimeter. The amount of voltage b ...

CHAPTER 11 ■ POWER ON! For this measurement, both the red and black probes should have hook adaptors on the ends. Rotate the me ...

CHAPTER 11 ■ POWER ON! With this setup, all of the electricity that leaves the battery is going into the meter’s red probe, thro ...

CHAPTER 11 ■ POWER ON! As the W value increases, the battery life increases but the LED dims (see Table 11-1). As the W value de ...

CHAPTER 11 ■ POWER ON! But, since there isn’t any return path to the battery except for the one that goes through the LED, the c ...

CHAPTER 11 ■ POWER ON! For the power indicator circuit: (9.15 V - 1.8 V) / (30 mA / 1000) = 245 W The calculation reveals a 245 ...