Servo not working?

[Mike]

Hi,

Can’t seem to get my TowerPro SG90 servos working. They tick, sometimes move, sometimes not – it’s wierd.

Please advise!

[Joseph]

Once the program has ended, the Crumble then goes into ‘stopped’ mode. So, a program with a single servo instruction would create a kind of tick.

If this is the case, could you try and put a wait command after the servo block?

All the best,

Joseph

[Mike]

Code is same as yours – that you tweeted. Just checking rest of circuit…

[Mike]

Gosh Darnit – it was a defective battery! All working now!

Thank you for a FAB new update and super quick support!

🙂

[Joseph]

Good to hear it’s now working. And thanks 🙂

[stewart]

Hi

Have had good fun today getting to know Crumble but now stuck with servo use.

I am wondering if I can use small a TowerPro SG90 servo
Have looked but cannot find any help giving connections and test code

Please could you direct me to suitable instructions

Thanks in anticipation

Attachments:

1. 

   servo.png
   

[Joseph]

Hi,

The servos have three connections, two for power and one signal/control line. Simply connect the power to + and – on the Crumble, and connect the signal to A, B, C or D (you can connect up to 4 servos).

The wire colours vary, but I believe the SG90 is:
Red: +
Brown: –
Orange: signal

I’ve attached a simple program that should test the servo (on A). One thing to be aware of is that when a program finishes, the Crumble stops outputting the signal to the servo. The attached program is looped, so never ends.

I hope this helps.

Joseph

Attachments:

1. ServoTest.crm

[stewart]

Thanks for your help and servo code
It works well with the cheap tower pro servo
and also with a larger 360 degree servo.

Excellent program
Now my favourite for education

[Joseph]

Many thanks 🙂

[Author]

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