- Continuity test of all traces between DRV8825s and ESP32
- Voltage measurements at logic high points
- Without 24V power (just ESP32)
- With 24V power
- Cut between pin 1 and 2. Does not run. No sound, nothing.
- Cut trace before 1&2. Nothing.
- No change from changed DAC (pin 1&2 voltage) to
- 0.6 V (50)
- 1.3 V (100)
- 1.9 V (150)
- 2.6 V (200)
- 3v3 (255)
- Put on 24 to 5V regulator. Made loud tone. Changed step delay and the same resulted: 500, 1000, 1200, 1500, 2000, 2500 (us).
- Put 33kΩ between ground and pin 1&2. No change.
- Tried incrementing step delay.
Program
C++:
const int stepPinX = 2;
const int stepPinY = 18;
const int DAC_CH2 = 26; // blue
void setup()
{
pinMode(stepPinX, OUTPUT);
pinMode(stepPinY, OUTPUT);
// dacWrite(DAC_CH2, 150); // 2 V
}
void loop()
{
// stepX();
for (int i = 0; i < 800; i++)
{
dacWrite(DAC_CH2, 50);
stepY();
stepX();
}
for (int i = 0; i < 800; i++)
{
dacWrite(DAC_CH2, 150);
stepY();
stepX();
}
for (int i = 0; i < 800; i++)
{
dacWrite(DAC_CH2, 200);
stepY();
stepX();
}
for (int i = 0; i < 800; i++)
{
dacWrite(DAC_CH2, 255);
stepY();
stepX();
}
delay(1000);
}
void stepX()
{
digitalWrite(stepPinX, HIGH);
delayMicroseconds(50);
digitalWrite(stepPinX, LOW);
delayMicroseconds(800);
}
void stepY()
{
digitalWrite(stepPinY, HIGH);
delayMicroseconds(50);
digitalWrite(stepPinY, LOW);
delayMicroseconds(800);
}PCB
There is a large heat sink on top of the driver ICs.
Schematic
(The heat sink jumper just connects the top pad to the bottom pad of the driver.)
A previous version of this PCB works. Although, it is not tied to a schematic. So that's why I am trying to get this one to work. Any suggestions or anything you see that should probably be changed?
One PCB with one driver causes a motor to make a sound for about a second or two. Then it seems like the power is cut off completely. Another never causes the motor to make any sounds and just gets very hot.
