Board-dat/DAS/DAS1013-dat/DAS1013-dat.md
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@@ -27,7 +27,7 @@ legacy wiki page - https://w.electrodragon.com/w/Arduino_IR_Infrared_shield
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## demo code
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-- IRremote - https://github.com/z3t0/Arduino-IRremote
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+- [IRremote](https://github.com/z3t0/Arduino-IRremote)
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Board-dat/PIN/pins003-dat/pins003-dat.md
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## demo
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-- setup guide - https://www.youtube.com/shorts/aOFLWS1JEIU
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+- [setup guide ](https://www.youtube.com/shorts/aOFLWS1JEIU)
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- [[pins003]]
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Tech-dat/acturator-dat/motor-dat/servo-dat/2025-04-09-15-37-30.png
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Binary files /dev/null and b/Tech-dat/acturator-dat/motor-dat/servo-dat/2025-04-09-15-37-30.png differ
Tech-dat/acturator-dat/motor-dat/servo-dat/servo-dat.md
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- [[servo-gimbal-dat]]
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+## feature of servos
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+
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+- The servo is a device that can control the angle of rotation of the motor shaft. It consists of a DC motor, a gear set, and a position feedback system.
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+- The servo can be controlled by a PWM signal, which determines the angle of rotation of the motor shaft.
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+- The servo can be used in various applications, such as robotics, RC vehicles, and automation systems.
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+- The servo can be classified into different types based on its construction and operation, such as analog servos, digital servos, and continuous rotation servos.
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+- The servo can be powered by different voltage levels, typically ranging from 4.8V to 6V for standard servos and up to 7.4V for high-performance servos.
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+- The servo can be controlled by different protocols, such as PWM, I2C, and UART, depending on the application and the controller used.
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+- The servo can be equipped with different types of gears, such as plastic gears, metal gears, and ceramic gears, depending on the torque and speed requirements of the application.
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+- The servo can be used in various configurations, such as standard servos, mini servos, micro servos, and high-torque servos, depending on the size and weight constraints of the application.
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+- The servo can be used in different environments, such as indoor, outdoor, and underwater, depending on the sealing and protection features of the servo.
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+- The servo can be used in different applications, such as robotics, automation, and control systems, depending on the requirements of the application.
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+- The servo can be used in different industries, such as automotive, aerospace, and consumer electronics, depending on the requirements of the application.
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+
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## products
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- Micro servo - [[SCU1030-DAT]] - [[SCU1031-dat]]
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- MG995 micro servo - [[SCU1012-DAT]]
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+
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+These servo models differ primarily in terms of gear material, torque, and rotation angle.
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+
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+The SG90 is the basic widely-used model. The SG90 comes in 90-degree, 180-degree, and 360-degree versions that are identical except for their rotation angles.
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+
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+The MG90S is essentially an enhanced version of the SG90 with metal gears, though its mounting dimensions differ slightly from the SG90.
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+
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+The 90-degree and 180-degree servos have identical physical dimensions and torque specifications, differing only in their maximum rotation angles. The 360-degree servo allows continuous rotation.
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+
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+The fixed-wing S-version servo (with 25cm wire length) is not the helicopter version. Compared to helicopter servos, it has lower pull strength, performance, and motor lifespan. It's suitable for electric fixed-wing aircraft made of foamboard or foam (recommended) and offers good value for money.
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+
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+
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+## wiring
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+
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+![](2025-04-09-15-37-30.png)
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+
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+
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## Knowledge
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The control of the steering gear generally requires a time base pulse of about 20ms. The high level part of the pulse is generally the angle control pulse part in the range of 0.5ms-2.5ms, and the total interval is 2ms.
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+
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Taking the 180-degree angle servo as an example, the corresponding control relationship is as follows:
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- 0.5ms------------ 0 degrees;
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![](47-08-17-21-06-2023.png)
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+
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+## code
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+
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+### arduino
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+
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+ #include <Servo.h>
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+ Servo servo;
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+ int angle = 10;
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+ void setup() {
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+ servo.attach(8);
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+ servo.write(angle);
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+ }
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+ void loop()
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+ {
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+ // scan from 0 to 180 degrees
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+ for(angle = 10; angle < 180; angle++)
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+ {
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+ servo.write(angle);
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+ delay(15);
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+ }
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+ // now scan back from 180 to 0 degrees
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+ for(angle = 180; angle > 10; angle--)
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+ {
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+ servo.write(angle);
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+ delay(15);
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+ }
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+ }
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+
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+
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+## FAQs
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+
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+### Can a Servo Hold Position When Power Is Off?
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+
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+**No**, standard servos cannot hold position when powered off — they lose holding torque.
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+
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+#### Alternatives:
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+- **Servos with mechanical brakes** – lock position without power.
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+- **High gear ratio digital servos** – may resist movement, but not reliable.
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+- **Stepper motors with brakes** – hold position more effectively.
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+- **External locking mechanisms** – physical clamps or brakes.
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+
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+
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+
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+
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## ref
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+
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+- [[motor-dat]]
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app-dat/app-dat.md
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## Electrified in the air
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- [[quadcopter-dat]] - [[FPV-dat]] - [[UAV-dat]]
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+
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+- [[parachute-dat]] - [[rocket-dat]]
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## Electrified on the ground
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app-dat/parachute-dat/parachute-dat.md
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+
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+# parachute-dat
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+
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+
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+## parachute opener
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+
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+- [[servo-dat]]
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