This pinch valve was designed with the following specifications:

• For silicone tubing with an outer ⌀ 8 mm and an inner ⌀ 5 mm
• Double opposing valves, possibility to make a three-way valve
• The camshaft hole must be heated with a soldering iron and then hot inserted onto the metal servo gear
• Compatible whit standard 20 mm rc servo, here a Tower Pro MG996R
• The valve body can be glued to the servo with hot glue gun or epoxy resin.
• The cover can be glued with cyano glue or epoxy resin.
• All PLA

Applying a bit of silicone grease on the camshaft is a must.

// Example of arduino code to operate the valve :

#include <Servo.h>

Servo myservo; // create Servo object to control a servo

void setup() {
myservo.attach(2); // attaches the servo signal to pin 2
Serial.begin(9600);
}

void loop() {

myservo.attach(2); //power on the servo
delay(100);
myservo.writeMicroseconds(1000); //adjust this value between 1000 and 2000
Serial.println("1000");
delay(2000); // Allow time to reach the position
myservo.detach(); //power off the servo, to avoid jitteing

delay(3000);

myservo.attach(2);
delay(100);
myservo.writeMicroseconds(2000);
Serial.println("2000");
delay(2000); Allow time to reach the position
myservo.detach();

delay(3000);

}