Problems with AccelStepper on ESP8266 with DM860A and Nema 34 1600oz/in
I am currently setting up a carriage positioning system using a Nema 34 1600oz/in with a DM860A driver at 60 volts.
I am using an ESP8266 (Wemos D1 r2) to operate the DM860A
When using th2 Wemos the stepper is not running smoothly at all it seems to be skipping steps or
having an harmonic like beat at regular intervals.
Since we just received this drive, I suspected that It might be faulty.
I then verified it using the breakout board and Mach3
With mach3 i have no problem at all I can run the motor a any reasonable speeds
1- (Given the DM860A has its interface inputs rated for 5 volts)
and since I am using the pulse - and dir - as opposed of pul+ and dir+
thus syncing voltage.
Is it necessary to use a logic level shifter to interface my esp8266 to the driver
(I am assuming not)
2- I have tried to adjust the minPulseWidth (no change)
3- I have tried to setPinsInverted(true,true) and false, false (no change)
4- Can i expect my stepper driver & motor to run as smoothly as when paired to mach3 through the breakout board
DM860A same as DM860h from leadshine url=http://www.leadshine.com/UploadFile/Down/MA860Hm.pdf
The esp8266 was used to achieve 37kHz here https://groups.google.com/forum/#!topic/accelstepper/0FS0ZowR3WE
here is the very simple code I am testing with
Stepper Motor Control - speed control
microstep driver DM860A
Pul+ goes to +5V
Pul- goes to Arduino Pin 9 D7 on Wemos D1
Dir+ goes to +5V
Dir- goes to to Arduino Pin 8 D6 on Wemos D1
Enable+ to nothing
Enable- to nothing
byte direcPin = D6;
byte pulsePin = D7;
// Define a stepper and the pins it will use
AccelStepper stepper(1, pulsePin, direcPin);
// Change direction at the limits if (stepper.distanceToGo() == 0) stepper.moveTo(-stepper.currentPosition()); stepper.run();
Some pictures of the hardware
if I understand it correctly the driver has an optocoupler input interface.
In general, 5V is not good with the Wemos device.
You should either use a simple open collector interface from Wemos to the driver, similar to the description of "Connections to open-collector signal (common-anode)"
Or it might even work with the 3.3V.
Connect DIR- and PUL- to GND, connect DIR+ and PUL+ to the "+5V". Please double check before, if my assumption of the input is correct. It would be similar to the "Connection to PNP signal (common-cathode)" description.