Hey all I am wondering how to go about switch from camera 1, 2 or 3 using this 3 Channel Video Switcher Module on ebay here. enter image description here

Since there's only V+, V- and signal for the "switch" it looks to take a PWM but I am not quite sure if that's correct or not. If correct then how would I (in code) send that out for each camera to change?


Well I've tried the following code:

int LED_pin = 9; // must be one of 3, 5, 6, 9, 10 or 11 for PWM

void setup() {
  pinMode(LED_pin, OUTPUT); // Initialize pin for output

void loop() {
  int dtwait = 1000; // Pause interval, milliseconds
  int V1=20, V2=220, V3=120; // 8-bit output values for PWM duty cycle
  analogWrite(LED_pin, V1);
  analogWrite(LED_pin, V2);
  analogWrite(LED_pin, V3);

and just to test it I hooked up 2 green LEDs to digital pin 9 and I can confirm it does light the led's in 3 stages. From bright, medium and then dim-ish.

So I went ahead and powered up the FPV by hooking it up like so: enter image description here

One looks like it says P15V 331QE BZ10 enter image description here

While the other side has one that maybe says STC 15F104E F-4V938.A enter image description here

What could I be doing incorrectly?

  • \$\begingroup\$ Ask the supplier for a datasheet, and/or find the datasheet for the IC used on the board. (And don't buy things if the supplier doesn't provide adequate documentation.) \$\endgroup\$ Nov 18, 2014 at 17:02
  • \$\begingroup\$ Updated my OP to show code and my connections. \$\endgroup\$
    – StealthRT
    Dec 7, 2014 at 4:28

2 Answers 2


I used a very similar switch with an Arduino (to generate the PWM signal). Have a look here:


  • \$\begingroup\$ Can you simplify that posting with just the needed code for switching to either video1, video2 or video3 using the digital pin 3 PWM? Lots of information on that site with a lot more code than i really am in need of. Thanks! \$\endgroup\$
    – StealthRT
    Dec 6, 2014 at 20:06

Alright I got it.

Using the #include Servo library I was able to get the following values confirmed that switched the video input:

cam1 = 0-64 and also 153-180
cam2 = 65-123
cam3 = 124-152

The arduino code looks like this:

#include <Servo.h>

Servo myservo;
int pos = 0;

void setup()

void loop()
  for(pos = 0; pos < 180; pos += 1)  // goes from 0 degrees to 180 degrees 
  {                                  // in steps of 1 degree 
    myservo.write(pos);              // tell servo to go to position in variable 'pos' 
    delay(1000);                     // waits 1 minute so i can see the value

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