ESP32: DAC or PWM

Projects Programming
1

Hi, in my project I need to send voltage's clear and short signals to a PCB. So I tried first using the ESP32's DAC feature but I realized that the lower signal never goes back to zero (remainning around 0.08V). I also realized that the higher signal gotten is 3.18V a bit lower than the feeded tension 3.29V. These voltages were measured in my MH ET Live ESP32 MiniKit).

While using PWM I get 0V and 3.28V in the same conditions. So I'm wondering if the DAC feature has any advantage against the PWM.

But there is also another issue calling my attention. In the short code attached both features do not work together. I tried in various variants without success. The dacWrite() overlaps the ledcWrite() command.

int PinPulsos = 25;
int FrecPulsos = 5000;
int CanalPulsos = 0;
int Resolucion = 8;
int Pausa = 1500;

void setup()
{
  Serial.begin(115200);
  ledcSetup(CanalPulsos, FrecPulsos, Resolucion);
  ledcAttachPin(PinPulsos, CanalPulsos);
}

void loop()
{
  dacWrite(PinPulsos, 255);
  delay(Pausa);
  dacWrite(PinPulsos, 78);
  delay(Pausa);
  dacWrite(PinPulsos, 0);
  delay(Pausa);

  ledcWrite(CanalPulsos, 255);
  delay(Pausa);
  ledcWrite(CanalPulsos, 78);
  delay(Pausa);
  ledcWrite(CanalPulsos, 0);
  delay(Pausa);
}

Am I doing something wrong? I'll appreciate your comments.