เซอร์โวควบคุมด้วยปุ่มหมุน

Time to take control by hand. Turn a potentiometer and the servo follows in real time, like a tiny steering wheel. 🎛️

The idea is simple: read the knob, convert that number into an angle, and write it to the servo, over and over inside loop().

Use analogRead() on the pot's pin. It gives back a number from 0 to 1023 that follows how far you've turned the knob.

The knob speaks 0 to 1023, but the servo only understands 0 to 180. You need to convert between those two scales.

The map() function rescales a number from one range into another. It's the perfect bridge from knob units to servo degrees.

Now feed that mapped angle straight into write(). The servo snaps to whatever position your knob is pointing at.

Read, map, write: stack those three lines in loop() and the servo tracks your knob continuously.

Add a tiny delay() at the end of the loop. It gives the servo a moment to reach each position and smooths out the motion.

The potentiometer's outer pins go to 5V and ground, and the middle wiper pin goes to analog pin A0. That gives a clean sweep of voltage.

Analog readings wobble a little, so the servo may jitter. Reading several times and averaging, or ignoring tiny changes, calms it down.

Want the servo to turn the opposite way? Just swap the map output to go from 180 to 0 instead of 0 to 180.

Let's connect the knob reading to a servo angle.

Read the pot, map 0 to 1023 into 0 to 180, then write that angle each loop. Now your hand directly steers the servo. 🙌