Simple buggy motor control

[killerwhat]

Have made input A run motor 1 forward (if A is Hi then Motor 1 Forward else Motor 1 Stop) & input B run motor 2 forward but if I try to use inputs C & D to run 1 & 2 in reverse I get a wierd pulsing effect and they wont go in reverse??
Help please

[killerwhat]

Crumbuggy code:

https://www.dropbox.com/sc/m0yjx666aoltgk2/AADkFBmyNgIxMh539fyIYaypa

[Joseph]

I suspect as the program runs through the loop, both ‘else’ sections are being executed and turning the motor off, hence the pulsing.

You could fix this by adding an ‘if C low’ in the else section of the if A statement.

Alternatively, you could change the program so it deals with the four combinations of each input separately. So for motor 1:

A: HI C: LO — Motor 1 Forwards
A: LO C: HI — Motor 1 Reverse
A: LO C: LO — Motor 1 Stop
A: HI C: HI — Motor 1 Stop (or could set forward)

I’ve just enabled attachments, so you can now upload your program. I’ll try and attach and image now…

Hope this helps!

Joseph

Attachments:

1. 

   Screen-Shot-2015-05-15-at-14.02.49.png
   

[killerwhat]

Thanks Joseph
I’ll give it a try.
Regards
Steve

[Joseph]

No problem 🙂
It looks like my Crumble file didn’t attach – will try again…

Attachments:

1. Motor-buggy-Killerwhat.crm

[Mike]

Depends a bit on what you have attached to A, B, C and D… What is the hardware setup? 🙂

[killerwhat]

All sorted. The code that Joseph attached worked perfectly.
I have 4 little PTM switches on a board with one side of each commonly connected to a croc lead to be clipped to +ve the other 4 sides to crocs for clipping to A,B,C & D

[Mike]

Yup – just looked at the code again and as Joseph said, you’re making the motor move, then a bit further on in the code you are stopping the same motor. I think the attached is about the shortest solution…

Attachments:

1. 

   motor-fwd-back.png
   

[Author]

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