7 replies to this topic

[SlartiBarfarst]

I'm new to the Netduino community, and just got my LED to flash, now I'm ready for something more complex.

 

  In the past I've driven a motorized tank using a L293 H bridge and a Basic Stamp, and would like to do the same with my Netduino Mini.

 

  I have found a driver at http://netmftoolbox....pported devices however I am receiving the error pictured in the attachment below.

 

any assistance/ suggestions would be greatly appreciated.

Attached Files

•  untitled.JPG   81.89KB   22 downloads

[hanzibal]

Hi! One or more of the HBridge constructor parameters are of the wrong type. Try writing Cpu.Pin.xxx instead of just Pins.xxx. Does that help? If not, a silly way to find out what is the cause, replace both PWM object parameters with null. if the error goes away, then you know the PWM obejcts are of the wrong type. If not, it's the Pins. Depending on the outcome of the above, investigate further as needed by examining the type of the corresponding parameters making sure they match those of the method signature.

[SlartiBarfarst]

Thank you for your reply, I tried using Cpu.Pin.## instead of Pins.## with no success.

 

I'm new to object oriented progamming so I'm not fluent with the launguage, but I think I understand.

 

Could the issue be caused by HBridge calling on the Microsoft.SPOT.Hardware.Cpu.Pin whose pin enumeration differs from that of the Mini?

[hanzibal]

Did you try replacing with null as described? The error has nothing to do with oop, it's just a matter of passing parameters of the correct type. Yes, it could be enumerator difference between the two. EDIT: Could you zip and attach your code so I could try it?

[SlartiBarfarst]

Sorry I neglected to mention that nulling both the PWM params results in the same error.

 

Here is a zip of the project as requested, not exactly the same as in the previous pic.

 

This permutation only results in a namespace error that I can't seem to resolve.

 

Thanks again for your assistance.

Attached Files

•  L293.zip   12.91KB   10 downloads

[hanzibal]

Ok, just modify the erroneous line like this:

// Defines the HBridge IC on the correct pinsHBridgeMotorDriver = new HBridge(PWMChannels.PWM_PIN_20, Pins.GPIO_PIN_19, PWMChannels.PWM_PIN_18, Pins.GPIO_PIN_17);

It works for me (Netduino mini with framework 4.2) and should for you too I hope.

 

EDIT: Works = the code compiles but I don't have a H-brigde driver and forgot to check with the scope.

[SlartiBarfarst]

You are my hero, it works great.

[hanzibal]

That is great news, good luck with your project!