untitled

3. Place the four RB5-5-S relays (Relay 1–Relay 4) and five 2N3904
   (Q1–Q5) transistors on the breadboard, as shown in Figure 13-19.
   Insert each transistor lead into a separate breadboard row with the
   
   
   • Collector lead to the left side, as shown in Figure 13-19
   
   
   • Base lead in the center
   
   
   • Emitter lead to the right
     The collector pin of Q2 goes in the same breadboard row as Pin 16 of
     Relay 1. The collector pin of Q3 goes in the same breadboard row as Pin
     16 of Relay 2. The pin designations of the 2N3904 transistors and the
     LM7805 voltage regulator are shown in Figure 13-20.
   
   
   
   

IC 1

Receiver battery TB

Main battery TB Receiver module

Right

sensor

TB

IC 2

Buzzer TB Motor battery TB Left motor TB

Left sensor TB

IC 3 Right

motor

TB

Figure 13-18:

Place the

ICs and

terminal

blocks

on the

breadboard.

322 Part IV: Good Vibrations