旋钮控制舵机
使用电位器控制舵机
旋钮控制舵机 是 CoddyKit 上的免费 Arduino & IoT Academy 课时。 这是第 4 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Arduino & IoT Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Arduino & IoT Academy 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Steer with a Knob
Time to take control by hand. Turn a potentiometer and the servo follows in real time, like a tiny steering wheel. 🎛️
The Plan
The idea is simple: read the knob, convert that number into an angle, and write it to the servo, over and over inside loop().
Read the Knob
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.
int val = analogRead(A0);The Range Mismatch
The knob speaks 0 to 1023, but the servo only understands 0 to 180. You need to convert between those two scales.
map() to the Rescue
The map() function rescales a number from one range into another. It's the perfect bridge from knob units to servo degrees.
int angle = map(val, 0, 1023, 0, 180);Send It to the Servo
Now feed that mapped angle straight into write(). The servo snaps to whatever position your knob is pointing at.
myServo.write(angle);The Whole Loop
Read, map, write: stack those three lines in loop() and the servo tracks your knob continuously.
void loop() {
int val = analogRead(A0);
int angle = map(val, 0, 1023, 0, 180);
myServo.write(angle);
}Let It Settle
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.
delay(15);Wire the Pot
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.
Tame the Jitter
Analog readings wobble a little, so the servo may jitter. Reading several times and averaging, or ignoring tiny changes, calms it down.
Flip the Direction
Want the servo to turn the opposite way? Just swap the map output to go from 180 to 0 instead of 0 to 180.
int angle = map(val, 0, 1023, 180, 0);Quick Check
Let's connect the knob reading to a servo angle.
Recap
Read the pot, map 0 to 1023 into 0 to 180, then write that angle each loop. Now your hand directly steers the servo. 🙌
常见问题解答
「旋钮控制舵机」课时是免费的吗？
是的 — 「旋钮控制舵机」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Arduino & IoT Academy 课程的其余内容，请升级到 CoddyKit PRO。 Arduino & IoT Academy 课程共包含 4 节课。
「旋钮控制舵机」这节课中我会学到什么？
使用电位器控制舵机 你通过在浏览器中直接运行的动手代码来练习 Arduino & IoT Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Arduino & IoT Academy 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Arduino & IoT Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 4 节课，共 4 节。
「旋钮控制舵机」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Arduino & IoT Academy 课中编写并运行代码吗？
能。每节 Arduino & IoT Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。