Hi.
Have you tried to compile the code but without the lines that control the motor? Add just a boolean variable to save the received message and remove the lines of code that control the motor to check if it’s related to that.
 
Have you tried controlling the motor without the MQTT part? Just to check if the library is actually working without any issues with the current motor setup.
 
Regards,
Sara
 
 
 
 

HI
Have tried both
ran the code without MQTT and worls fine   and have ran it with MQTT but with no stepper anda led connected to digital pin and that worked fine
regards
Dave

 P S i have also tried with esp now sending the temperature and the rernote bord recieving the temperature and the stepper works fine  

Hi.
I’ve looked at the library documentation and found the issue.
 
Basically, the runtToPosition() function can’t be used inside event loops (like you’re using, inside the onMqttMessage() functions). – check it out here.
It mentions: “ Moves the motor (with acceleration/deceleration) to the target position and blocks until it is at position. Don’t use this in event loops, since it blocks.”
 
How to fix this issue? Here are two options that I think might solve the issue:
 
1. Take a look at the library documentation and see if there is an available method that doesn’t block the code. You can check the library class reference here: https://www.airspayce.com/mikem/arduino/AccelStepper/classAccelStepper.html
 
2. Another alternative is to use global variables, whose value you change inside the onMqttMessage() function, and then, inside the loop(), you constantly check the value of that variable and then you control the motor accordingly.
 
I hope this helps.
 
Regards,
Sara
 
 

Thanks for that Sara
I will chek it out and let you know
regards dave

Hi
I have managed to get  MQTT and Stepper.h to talk to each other using global variables as you suggested.
this allows me to turn the stepper  cw and ccw but i have a problem  .  the code turns a radiator spindlle cw to close and ccw to open and therefore must only turn once cw and not turn again untill  ccw varable is recieved  and then just turn once etc
i have included the code  in google drive as above  file nameMQTT_stepper.docs
the code at the moment works perfectly for the first 2 cycles i.e cw rotate then no movement untill ccw rotation and then no movement untill next cw . unfortunatly at thhis second cw rotaion the motor will not revolve because the cwMove varable is still true.    It wouls be great if you point me in the right direction to solve this
Thanks for your  help
regards Dave

Hi.
It seems that you need to add another global variable to check whether the motor has already spinned, and change it when the ccw variable is received again, but it depends on the way your code is organized.
I didn’t get any link to google docs. Can you share it again?
Regards,
Sara

Hi
you are right and I have finally got it right   Thanks for your help
regards Dave 
PS  consider the problem solved 

Great.
I’m glad you solved the issue.
I’ll mark this issue as resolved.
If you need further help, you just need to open a new question in our forum.
Regards,
Sara