Cannot get the servo to move

Community General Discussions
1

I'm building the robot under the "Start Here" tab. I've connected and soldered everything and I can't get the servo to move. I'm at the part where I enter:

servo 0, 75

wait 2

servo 0, 225

wait 2

servo 0, 150

wait 2

but nothing happens. When I press F5 on the program editor it connects to the hardware and says it has downloaded successful. I can't think of any ways to troubleshoot further to isolate the problem. I've been over the instructions and soldering again and again and can't find my mistake. Any thoughts on what I can do next to find the problem? Thank you.

 

2

Darlington chip

Did you replace the darlington chip (the one that is not the Picaxe itself or the L293 motor driver chip) with the “resistor chip”?

3

Re: Darlington chip

Yes, here’s a picture of it:

20131010_174112.jpg

4

Blobs…

I can see a considerable blob of solder on your “outside pin” (The ground pin).  Double check your soldering --make very sure you have no “bridges”  I.e. solder connecting two adjacent pins.

Also, your first picture did not come through --you did indeed replace the darlington with the “resistor chip”, no?

5

Re: Blobs…

Here’s a second try at that first photo. The chip that I have says

4116R LF

1-331

?BC1135

The soldering isn’t great but I checked to make sure all the blogs aren’t connected and they are not.

20131010_174112.jpg