Add Tip Ask Question Comment Download Step 4: More Things About Servos Controlling servos is easy, and here are a few more tricks we can use: Controlling the exact pulse time Arduino has a built-in function servo.write(degrees) that simplifies the control of servos.Using the Arduino, we can tell a servo to go to a specified position and it will go there.
Rfduino Servo Sample Download Step 4As simple as that Servo motors were first used in the Remote Control (RC) world, usually to control the steering of RC cars or the flaps on a RC plane. With time, they found their uses in robotics, automation, and of course, the Arduino world. Rfduino Servo Sample How To Connect AHere we will see how to connect a servo motor and then how to turn it to different positions. The first motor I ever connected to an Arduino, seven years ago, was a Servo motor. Nostalgic moment over, back to work We will need the following things: An Arduino board connected to a computer via USB A servo motor Jumper wires There are few big names in the servo motor world. Good places to buy them are Servocity, Sparkfun, and Hobbyking. This instructable and many more can be found in my Arduino Development Cookbook available here.:D Add Tip Ask Question Comment Download Step 1: How to Connect Them A servo motor has everything built in: a motor, a feedback circuit, and most important, a motor driver. Following are the steps to connect a servo motor to the Arduino: The servo motor has a female connector with three pins. Connect the power cable that in all standards should be red to 5V on the Arduino. Connect the remaining line on the servo connector to a digital pin on the Arduino. Check the image for a view of the servo connected to the Arduino. Attachments Servomotor.ino Download Add Tip Ask Question Comment Download Step 3: How It Works Servos are clever devices. Using just one input pin, they receive the position from the Arduino and they go there. Internally, they have a motor driver and a feedback circuit that makes sure that the servo arm reaches the desired position. But what kind of signal do they receive on the input pin It is a square wave similar to PWM. Each cycle in the signal lasts for 20 milliseconds and for most of the time, the value is LOW. At the beginning of each cycle, the signal is HIGH for a time between 1 and 2 milliseconds. At 1 millisecond it represents 0 degrees and at 2 milliseconds it represents 180 degrees. Remember that using the Servo library automatically disables PWM functionality on PWM pins 9 and 10 on the Arduino UNO and similar boards. Rfduino Servo Sample Code Simply DeclaresCode breakdown The code simply declares the servo object and then initializes the servo by using the servo.attach() function. In the loop(), we set the servo to 0 degrees, wait, then set it to 90, and later to 180 degrees.
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