Hi, has anyone tried piloting some servos with the XIAO ESP32-C3 ?
I tried some libraries but the only way i found so far is to use the ledc example.
Any help is appreciated.
You can get some help from this thread. Somebody faced a similar issue and solved it by using the ESP32 ESP32S2 AnalogWrite library library.
By the way, in case you ever use a generic ESP32, it’s always recommended to use a servo controller like this:
Are there pins on the ESP32-C3 that are better than others for the AnalogWrite library? Pin 9 seems to work, but 10 doesn’t for some reason - running same code, just switching pin #, etc.
New update for the ESP32 ESP32S2 AnalogWrite library (4.3.2) adds support for GPIO 10, 20 and 21.
Now supporting 15 PWM pins on the ESP32-C3: GPIO 0 to 10 and 18 to 21.
Also supports Servo Easing:
Servo Easing Controls three servos with different easing settings.
Using the ESP32Servo library and this sketch:
#include <ESP32Servo.h>
Servo myservo, myservo1, myservo2, myservo3, myservo4, myservo5, myservo6, myservo7, myservo8, myservo9, myservo10;
int pos = 0;
void setup() {
/*
ESP32PWM::allocateTimer(0);
ESP32PWM::allocateTimer(1);
ESP32PWM::allocateTimer(2);
ESP32PWM::allocateTimer(3);
myservo.setPeriodHertz(50);
myservo1.setPeriodHertz(50);
myservo2.setPeriodHertz(50);
myservo3.setPeriodHertz(50);
myservo4.setPeriodHertz(50);
myservo5.setPeriodHertz(50);
myservo6.setPeriodHertz(50);
myservo7.setPeriodHertz(50);
myservo8.setPeriodHertz(50);
myservo9.setPeriodHertz(50);
*/
myservo.attach(0, 750, 2250);
myservo1.attach(1, 750, 2250);
myservo2.attach(2, 750, 2250);
myservo3.attach(3, 750, 2250);
myservo4.attach(4, 750, 2250);
myservo5.attach(5, 750, 2250);
myservo6.attach(6, 750, 2250);
myservo7.attach(7, 750, 2250);
myservo8.attach(8, 750, 2250);
myservo9.attach(9, 750, 2250);
myservo10.attach(10, 750, 2250);
}
void loop() {
myservo.write(180);
myservo1.write(180);
myservo2.write(180);
myservo3.write(180);
myservo4.write(180);
myservo5.write(180);
myservo6.write(180);
myservo7.write(180);
myservo8.write(180);
myservo9.write(180);
myservo10.write(180);
delay(3000);
myservo.write(0);
myservo1.write(0);
myservo2.write(0);
myservo3.write(0);
myservo4.write(0);
myservo5.write(0);
myservo6.write(0);
myservo7.write(0);
myservo8.write(0);
myservo9.write(0);
myservo10.write(0);
delay(3000);
}
My servo moved on pin 0 and pin 2 only.
When i upgraded to last version i get pin 0,3,4,7,9,10 working.
Does someone have the same results ?
I think there is a problem when using to many pins as pwm at the same time.
In addition to my previous post, when i use the ESP32S2 AnalogWrite library with this sketch :
/*
Controls servo position from 0-180 degrees and back
https://wokwi.com/projects/350037178957431378
by dlloydev, December 2022.
*/
#include <pwmWrite.h>
Pwm pwm = Pwm();
void setup() {
}
void loop() {
for (int pos = 0; pos <= 180; pos++) { // go from 0-180 degrees
pwm.writeServo(0, pos);
pwm.writeServo(1, pos);
pwm.writeServo(2, pos);
pwm.writeServo(3, pos);
pwm.writeServo(4, pos);
pwm.writeServo(5, pos);
pwm.writeServo(6, pos);
pwm.writeServo(7, pos);
pwm.writeServo(8, pos);
pwm.writeServo(9, pos);
pwm.writeServo(10, pos);
delay(15);
}
for (int pos = 180; pos >= 0; pos--) { // go from 180-0 degrees
pwm.writeServo(0, pos);
pwm.writeServo(1, pos);
pwm.writeServo(2, pos);
pwm.writeServo(3, pos);
pwm.writeServo(4, pos);
pwm.writeServo(5, pos);
pwm.writeServo(6, pos);
pwm.writeServo(7, pos);
pwm.writeServo(8, pos);
pwm.writeServo(9, pos);
pwm.writeServo(10, pos);
delay(15);
}
}
I get pin0,1,2,3 working but no other.
If i comment them in code like this :
/*
Controls servo position from 0-180 degrees and back
https://wokwi.com/projects/350037178957431378
by dlloydev, December 2022.
*/
#include <pwmWrite.h>
Pwm pwm = Pwm();
void setup() {
}
void loop() {
for (int pos = 0; pos <= 180; pos++) { // go from 0-180 degrees
/*pwm.writeServo(0, pos);
pwm.writeServo(1, pos);
pwm.writeServo(2, pos);
pwm.writeServo(3, pos);*/
pwm.writeServo(4, pos);
pwm.writeServo(5, pos);
pwm.writeServo(6, pos);
pwm.writeServo(7, pos);
pwm.writeServo(8, pos);
pwm.writeServo(9, pos);
pwm.writeServo(10, pos);
delay(15);
}
for (int pos = 180; pos >= 0; pos--) { // go from 180-0 degrees
/*pwm.writeServo(0, pos);
pwm.writeServo(1, pos);
pwm.writeServo(2, pos);
pwm.writeServo(3, pos);*/
pwm.writeServo(4, pos);
pwm.writeServo(5, pos);
pwm.writeServo(6, pos);
pwm.writeServo(7, pos);
pwm.writeServo(8, pos);
pwm.writeServo(9, pos);
pwm.writeServo(10, pos);
delay(15);
}
}
I get pin 2,3,4,5,8,9 working !
@Dlloydev Did you have similar problems in your library or with other boards ?
It’s the first time that i have those problems with an esp32, i used 3 other types of board without much problems.
Any helop is appreciated.
Thank you for reporting this. I have the issue resolved and hope to get the update published later today. The Arduino library registry may take up to a few days to update. In the meantime, here’s the latest code in a Wokwi example.
There are 15 servos connected … you can choose any 6 PWM pins at a time that are available on your board.
Is there an easy way to configure the library to specific PWM?
- Pulse width range: 500 to 2400 microseconds.
- Frequency: 50 Hz.
before the library update I was working with:
#include <pwmWrite.h>
Pwm pwm = Pwm();
const int servoPin4 = 8;
const int servoPin5 = 9;
const int freq = 50; // Frequency in Hz (50 Hz is common for most hobby servos)
void setup() {
// Set the frequency for timer 4, which corresponds to channel pair 8 and 9
pwm.setFrequency(4, freq);
}
void loop() {
int position; // position in degrees
for (position = 0; position <= 180; position += 30) {
int pulseWidth4 = map(position, 0, 180, 500, 2400);
int pulseWidth5 = map(180 - position, 0, 180, 500, 2400);
int dutyCycle4 = map(pulseWidth4, 0, 20000, 0, (1 << 12) - 1);
int dutyCycle5 = map(pulseWidth5, 0, 20000, 0, (1 << 12) - 1);
pwm.write(servoPin4, dutyCycle4);
pwm.write(servoPin5, dutyCycle5);
delay(1000);
}
}