#include <M5Atom.h>

const int8_t linActPin1 = 33;
const int8_t linActPin2 = 23;
const int linActChannel1 = 1;
const int linActChannel2 = 2;
const int linActFreq = 200;
const int linActResolution = 8;

uint8_t method;

void setup() {
Serial.println();
ledcSetup(linActChannel1, linActFreq, linActResolution);
ledcAttachPin(linActPin1, linActChannel1);
ledcSetup(linActChannel2, linActFreq, linActResolution);
ledcAttachPin(linActPin2, linActChannel2);
}

void setServoPos(int8_t pos) {
ledcWrite(linActChannel1, pos);
ledcWrite(linActChannel2, pos);
}

void loop() {
method = 1;
Serial.print("O");
for (int posDegrees = 0; posDegrees <= 180; posDegrees++) {
setServoPos(posDegrees);
delay(50);
}
Serial.print("I");
for (int posDegrees = 180; posDegrees >= 0; posDegrees--) {
setServoPos(posDegrees);
delay(20);
}
Serial.print("-");
}

-best of luck.

The rods I can not reposition by hand; or actually, I do not want to use force, it does not shift easily.

The coming few days I have less time, so maybe I do not respond, this not a lack of interest, but just other things that require my attention and or time.

Thanks anyway, much appreciated.

#include <esp32-hal-ledc.h>
//in setup
ledcAttachPin(25, 1);

void SetServoPos(int pos) {
  ledcAttachPin(26, 1);
  delay(100);
  uint32_t duty = (((servoWritePos / 180.0)
                      * 2000)
                     / 20000.0 * 65536.0)
                    + 1634;
    ledcWrite(1, duty);
    delay(100);
    
  //ledcDetachPin(26);
  delay(100);
  posOld = pos;
}

some samples that may not work for you, but to give you the idea

1. The mini electric push actuator is equivalent to a linear motor : through the red and black two power lines to provide DC power supply DC 6-7.4V to the motor rotation, and drive the telescopic rod to achieve expansion, and stroke in any position can stop, can be self-locking.
   2.With PWM electric control : can be controlled by the receiver, can adjust the speed and direction.
   3.PWM module parameters :
   Weight:0.4g
   Size:12x8.5mm
   Voltage:3.5-6v
   Continuing current:1A ，The biggest current: 1.5A
   PWM range:1000~2000US
   BEC output: No
   Running direction: two-way, can be forward and reverse.
   Applicable motor:Brush motor.

Maybe this is enough. I could not get it working. Except for one moment it completely expanded, however I not reverse it or achieve another position. Hope you have some advice for me.

However I still have a question about using it for the linear actuator. It has a three wire input. A brown one, probably ground, a red one (5V? (document states Voltage 3.5 - 6V) and an orange one (control signal). I can not find much information about connecting such a device. Tried several setups with different frequencies (1000-2000), but nothing seems to work. Maybe an external adapter is needed. Any idea how to connect it?

For now a LED (but finally I hope to control a 5V linear actuator. The LED example is to experiment.

What are you controlling with PWM?