![]() ![]() I would recommend that you start with the theoretical values (min: 3276, max: 6553) and then carefully expand them until you notice that the servo actually cannot move any further. However, I found that with the servo I have bought, that not only it can move more than 180°, actually something near to 200°, but also that 1ms and 2ms are not the actual duty cycles that mark the min and max values. ![]() 1ms for the minimum which means 5% of whole period. So we need to normalize the actual duty-cycle value into this range.įor this we can simply calculate the percentage of the time values and then convert them to unsigned shorts. This method awaits unsigned short values which means we need to provide values in between 5. We need to use the built-in method pwm.duty_u16(.) to set the duty. The only thing we need to do is to set the output pin for the signal that we will be generating (any GPIO-Pin will do), set the frequency to 50Hz and then set the actual duty cycle in a loop to tell the servo which position it needs to track, which we will do by reading the input of the potentiometer. The Pico (among other MCUs) has some built in functionalities for generating PWM-Signals ( read here). Now what? The next step would be to care about how to control the servo via the MCU that we have at hand. We will take the input of the potentiometer on any of the ADC-Pins (Pin 28 in this example) and then feed it into the duty cycle to tell the servo which position it should take. Wiring Diagram (Assuming Pico is powered by USB) Next we will do the wiring, let’s go! The wiring Since the Servo awaits some higher Voltage than the Pico can give (which is 3.3V), we can either use the VBUS Pin of the Pico which will provide 5V (only when powered over USB), or attach an external power source directly to it (which I would recommend). 20ms Period) for the frequency and duty cycle range between 1ms and 2ms (so 1ms duty cycle will mean 0° for the servo and 2ms will mean 180°). Theoretically they can turn 180° (90° in each direction). The servo will act according to the current duty cycle that a controller for example is sending to it. If you wonder about what that means – click here to read more about PWM. This Servo (alike many other ones that are similar to this one) needs to be operated via PWM (Pulse Width Modulation). It has 3 pins, which are: VCC, GND and PWM (control-input pin). ![]() I have the “Tower Pro Micro Servo SG90” for example, which can be operated between about 4.8V and 6V. Raspberry Pi Pico (or any other MCU with PWM and ADC functionalities that will do the job).Micro Servo with Micropython Which components do you need for this project? As with my other posts I will use a Raspberry Pi Pico to achieve this, but you of course can use also any other microcontroller that is suitable for this task. ![]() Hey there! In this post I want to show you how to use a Micro Servo with Micropython controlled by a potentiometer. ![]()
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