![\"Raspberry](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/05\/Raspberry-Pi-Pico-Control-Servo-Motor-Micropython.jpg?resize=1200%2C675&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nNew to the Raspberry Pi Pico?<\/strong> Read the following guide: Getting Started with Raspberry Pi Pico (and Pico W)<\/a>.<\/p>\n\n\n\n Table of Contents:<\/strong><\/p>\n\n\n\n Throughout this tutorial, we\u2019ll cover the following contents:<\/p>\n\n\n\n Before continuing, make sure you follow the next prerequisites.<\/p>\n\n\n\n To follow this tutorial you need MicroPython firmware installed in your Raspberry Pi Pico board. You also need an IDE to write and upload the code to your board.<\/p>\n\n\n The recommended MicroPython IDE for the Raspberry Pi Pico is Thonny IDE. Follow the next tutorial to learn how to install Thonny IDE, flash MicroPython firmware, and upload code to the board.<\/p>\n\n\n\n Alternatively, if you like programming using VS Code, you can start with the following tutorial:<\/p>\n\n\n\n You’ll also need the following parts:<\/p>\n\n\n You can use the preceding links or go directly to MakerAdvisor.com\/tools<\/a> to find all the parts for your projects at the best price!<\/p> You can position the servo\u2019s shaft at various angles from 0 to 180\u00ba (depending on the model). Servos are controlled using a pulse width modulation (PWM) signal. The PWM signal sent to the motor will determine the shaft\u2019s position.<\/p>\n\n\n To control the motor you can simply use the PWM capabilities of the Raspberry Pi Pico<\/a> by sending a 50Hz signal<\/strong> with the appropriate pulse width.<\/p>\n\n\n Usually, the S0009 or SG90 servo motors (capable of 180\u00ba), the one we\u2019re using in this tutorial, used in most microcontroller projects, has a pulse width range of around 550 to 2400 microseconds<\/strong>:<\/p>\n\n\n\n For servo motors that only travel in the 90\u00ba range, these are usually the pulse width values:<\/p>\n\n\n\n These values can slightly vary between different servo models. Try to search for your servo datasheet or test these values and then adjust accordingly.<\/p>\n\n\n\n In my case, I haven\u2019t found the datasheet for my specific servo, but using the default pulse width values used in most Arduino libraries (550 to 2400 microseconds) works fine for the one we\u2019re using.<\/p>\n\n\n\n From those pulse width values, we can calculate the duty cycle to position the motor\u2019s shaft at a certain angle. The duty cycle is the ratio of the pulse-width to the total period of the signal. We can use the following formula:<\/p>\n\n\n\n The period is the inverse of the frequency. Our frequency is 50Hz, which corresponds to 1\/50 = 0.02 seconds (20000 microseconds).<\/p>\n\n\n\n So, to put the motor in 0\u00ba position, we need a 2.75% duty cycle:<\/p>\n\n\n\n With the Raspberry Pi Pico, 100% duty cycle value is represented by a digital value of 65535, and 0% is represented by 0 (learn more about PWM with the Raspberry Pi Pico here<\/a>). So, we can map the duty cycle values to the Raspberry Pi Pico 0-65535 range as follows:<\/p>\n\n\n\n So, the 0\u00ba position, would correspond to:<\/p>\n\n\n\n Doing the same procedure for the other values, we get:<\/p>\n\n\n\n Servo motors have three wires: power, ground, and signal. The power is usually red, the GND is black or brown, and the signal wire is usually yellow, orange, or white.<\/p>\n\n\n When using a small servo like the S0009 (or SG90), you can power it directly from the Raspberry Pi Pico power pin. However, for other models, you may need to apply an external power supply (check your servo datasheet).<\/p>\n\n\n\n\n
Prerequisites<\/h2>\n\n\n\n
MicroPython Firmware<\/h3>\n\n\n\n
![\"micorpython](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/micropython-logo.png?resize=250%2C250&quality=100&strip=all&ssl=1\"){kind=logo}
<\/figure><\/div>\n\n\n\n
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Parts Required<\/h3>\n\n\n\n
![\"Control](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/01\/servo-motor-raspberry-pi-pico.jpg?resize=750%2C422&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n
![](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/10\/header-200.png?w=1200&quality=100&strip=all&ssl=1\")
<\/a><\/p>\n\n\n\nHow to Control a Servo Motor?<\/h1>\n\n\n\n
![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2018\/05\/0-180-degrees.png?resize=500%2C199&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"hobby](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/01\/hobby-servo-motors.jpg?resize=750%2C422&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n
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Calculating the Duty Cycle<\/h3>\n\n\n\n
Duty cycle (%) = (pulse-width\/period)x100<\/code><\/pre>\n\n\n\nDuty cycle = (550\/20000)x100 = 2.75%<\/code><\/pre>\n\n\n\nMapped value = Duty cycle x (maximum value\/100)<\/code><\/pre>\n\n\n\nMapped value = 2.75 x (65535\/100) = 1802<\/code><\/pre>\n\n\n\n\n
Connecting the Servo Motor to the Raspberry Pi Pico<\/h2>\n\n\n\n
![\"Servo](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2018\/05\/servo-motor-pinout.jpg?resize=750%2C422&quality=100&strip=all&ssl=1\")
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![\"Wiring](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/01\/servo-raspberry-pi-pico_bb.png?resize=1200%2C333&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"Run](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2023\/12\/thonny-ide-run-button.png?resize=470%2C114&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"Control](\"https:\/\/i2.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/01\/control-servo-pico-2.jpg?ssl=1\")
<\/figure><\/div>![\"Control](\"https:\/\/i1.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/01\/control-servo-rpi-pico-1.jpg?ssl=1\")
<\/figure><\/div><\/div><\/div><\/div><\/div>\n\n\n\n![\"Controlling](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/01\/Raspberry-Pi-Pico-Control-Servo-Motor.jpg?resize=750%2C422&quality=100&strip=all&ssl=1\")
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