Drive : includes controller to create drive signal and amplify it to desired power Signal processing : includes RF radio, and controller to process received dataģ. Power : includes power source and regulatorĢ. So for starters we’ll see basic block diagram of how the system flow will work: Figure 1: System Block diagramĪs per figure 1 the logical block of unit has 3 major sectionsġ. Today we will command and operate a servo motor with RF data link. In this article I‘ll focus on how we can actually do this by controlling a servo motor with RF communication. Many new electronics engineers this way, either they never get time or they think it’s a lot to learn and create to do something like that. So the same I thought about making doors lock operated wirelessly and my shelf lock and a lot of other stuff. I made my first robot when I was in college and always thought to make totally wireless. This angle will then be fed into the feedback loop allowing software on a microcontroller to control the angular position of the motor shaft.Comment errors or corrections found for this circuit, and get the chance to win big! You can find our comments section at the end of this page. By sensing the voltage at the wiper terminal of the potentiometer, you can measure the angular position of the motor shaft. Now, as the motor shaftrotates, there will be a corresponding angular movement between the potentiometer shaft and its body. This arrangement is known as a shaft encoder. To implement the feedback loop you will need to fix the shaft of a rotary potentiometer to the foundation of the motor while allowing the potentiometer’s body to rotate freely with the motor shaft. This sort of a ‘feedback’ system is also used in commercially available servo motors. Voltage applied to the motor terminals will be so as to cause the shaft to turn to reduce ‘positional error’ to zero. This ‘current position’ will be compared against an ‘desired position’ and a ‘positional error’ will be generated. In order to control the shaft position of a DC motor (and thereby convert it into a servo motor), you need to be able to ‘encode’ the position of the shaft. This can be very useful when we want to move a control surface such as a rudder or a thruster to a particular position. Servo motors on the other hand, allow us to control the position (or angle) of the motor output shaft. In a DC Motor, speed control can be achieved by varying the terminal voltage but position control of the shaft is very difficult to implement. The problem with DC motors is that when they have a voltage applied to their terminals, they tend to rotate forever in a particular direction, stopping or reversing the motor can only be achieved by cutting off electric supply or reversing polarity. In most motors, like the one shown below, the gear train scales up the torque of the motor by using a reduction gearing that outputs a much higher torque (albeit at the cost of a much reduced output RPM). The torque that is generated at the output shaft can be scaled up or scaled down by using a gear train. DC Motors can be made to turn either clockwise or counter-clockwise by changing the polarity of the voltage applied to their terminals.
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