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    RGB LED Testing Steps

                     Step 1  Before making the circuit, we need to test the type of RGB LED. Take
                              a multimeter and its probes, connect the black probe to the common
                              slot, and the red probe to the mAvΩ slot as shown in the image.

                     Step 2  Set the multimeter to continuity mode.

                     Step 3  Check the multimeter probes. If they are working fine, they will
                              produce a sound.

                                                                Step 4  Take the breadboard and connect the RGB LED.
                                                                Step 5  Connect the black probe to the common pin and
                                                                         the red probe to one of the other pins of the RGB
                                                                         LED.

                                                                Step 6  If the RGB LED glows, it is a common cathode
                                                                         RGB LED, and the connections should be made
                                                                         accordingly.

                     Step 7 If  the  RGB  LED  does  not  glow,  swap  the  red  and
                              black probes. Now, connect the black probe to one
                              of the other pins of the RGB LED and the red probe
                              to the common pin of the RGB LED.

                     Step 8  If the RGB LED glows, it is a common anode RGB
                              LED, and the connections should be made as per the
                              common anode RGB LED configuration.

                     Circuit Setup Steps for Common Anode RGB LED

                     Step 1  Take a breadboard.
                     Step 2  Connect the 7805 voltage regulator IC to the breadboard as
                              shown.

                     Step 3  Take a battery and connect the battery cap.

                                                      Step 4   Connect the positive terminal of the battery to the input
                                                               terminal of the 7805 voltage regulator IC.

                                                      Step 5   Connect the ground terminal of the 7805 IC to the negative
                                                               terminal of the battery.

                                                                   Hands-On Electronics with Breadboard-Based Kit  29

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