The simplest solution for implementing joystick control for a robot would be to program the actions in software in a microcontroller. But, since many readers prefer off-the-shelf parts, this circuit is going to be made with diodes, resistors, transistors, and one FAN8200 motor driver chip. The downside is that the circuit is more complex. D10: A S
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chottky (low voltage drop) 1N5817 diode to prevent the FAN8200 chip from being damaged if the batteries are installed backwards. Other types of diodes may be acceptable substitutes, but a Schottky diode will consume the least amount of power. A diode is a one-way valve that blocks electricity from going the wrong direction. Electricity is allowed to go in the direction of the arrow, but not the other way. Thus, battery power is blocked if the batteries are installed backwards, but is permitted if installed correctly. C1 and C2: Capacitors store and release electricity locally to smooth out power glitches. This prevents errors in the FAN8200 motor driver chip due to spikes when switching the motors off and on. IC1: Fairchild FAN8200 dual motor driver chip from Jameco Electronics or WrightHobbies. net. The chip can control two motors (hence the term dual ). It can operate from 2. 5V to 7V, which is why this circuit is specified for that range. The chip takes power, ground, and inputs and then outputs the power to the motors. You could build your own H-bridge, but that would make this circuit more complex. Ground=GND=a symbol with three stacked lines that looks like a shaded pyramid (see pin 14 and the bottom of the capacitors). All ground lines should be connected to the negative (-) side of the battery. It makes the circuit look less busy to use a symbol than to draw wires back to a battery. The advantages of the FAN 8200...
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