Instructables

Step 1: Get the Parts

You will need:
2 555 timers (You only need one but get two just in case you break one.)
Jumper Wires/ Component Leads
Breadboard/Protoboard
1x:
1Kohm resistor
4.7Kohm resistor
10Kohm resistor
33Kohm resistor
68Kohm resistor
0.01uF capacitor
0.1uF capacitor
General Purpose NPN transistor (don't use a power transistor...it requires more power to operate.) (2N3904,BC547, etc.)
Servo Motor (DON' T use a micro servo...no torque...) (Use a continuous rotation servo if not...mod a regular servo.)
Batteries and accompanying holders
SPDT Slide Switch (don't use rocker or toggle)

Step 2: Build the circuit.

SAM_2181.JPG
SAM_2187.JPG
Build according to the schematic except...with the two buttons use the switch. The middle lead or common, is pin 6 of the 555 and the other two are the 68K and the 10K resistors. For the Servo leads, connect component leads (cut) to the servo's female headers. You could use male headers but that is harder to solder. Then plug them into the board.

Get the accompanying horns that come with the servo and pick the one with TWO arms.

Unscrew the old horn and replace the new one...if you already have it in well then...GREAT!

Once the switch is soldered and the motor is mounted test it out... if it starts rotating one way then flip the switch...if it works...

GREAT!

Now hot glue the slide switch to the motor. Make sure that if its going on the right side of the servo with the horn on its left the 68Kohm resistor is closest to the end of the servo.

If its on the left follow the exact opposite.

OIL the SLIDE SWITCH!!!
blinkyblinky (author) 3 years ago
This project reminds me of politicians.

It also reminds me when there is work to be done...
let me get this straight, the servo tester is just an H-bridge right?
i want to make this using a flipflop, can i use the one you showed in your other instructable about the 555 timer or a 556 dual timer?
blinkyblinky (author)  deathsmileyinc2 years ago
Ahhh...I said H-bridge in the video...

The servo has a board inside of it that reads pulses It is basically an H-bridge INSIDE the servo.
blinkyblinky (author)  deathsmileyinc2 years ago
No...the 555 sends a pulse to the servo. This is probably the best tester if you don't want to take apart your servo. You don't have to mount the switch on the side. I'll research the idea, however.
oh, i get it now, i didnt knew the difference between a regular motor and a servo but i read a little bit of theory on it, i would like a little bit more information on the 555 timer flipflops tough
blinkyblinky (author)  deathsmileyinc2 years ago
Bistable is a flip-flop. Basically, it will remain in one position until it is reset.

Trigger from pin 2 will cause it to set high. Pin 4 will reset the flip-flop when it is pressed.

Any questions?

Class dismissed.
this is.................. well....................useless lol 5*s
blinkyblinky (author)  TheAwesomestDude3 years ago
Of course...its called the useless machine...
i know that i was congragulating you on making something useless but .........well.............useless machine
blinkyblinky (author)  TheAwesomestDude3 years ago
You like ellipses...so do I.

By the way...I know...
what aare elipses?
blinkyblinky (author)  TheAwesomestDude3 years ago
............these...............
ohhhhh.............................these............................
blinkyblinky (author)  TheAwesomestDude3 years ago
Yes...these...
okkk..............................................................i get it.................................................
blinkyblinky (author)  TheAwesomestDude3 years ago
You're welcome...
ikr..............................................................................................................................
blinkyblinky (author)  TheAwesomestDude3 years ago
What's ikr?
i.......................................................know...........................................................right..........................................
blinkyblinky (author)  TheAwesomestDude3 years ago
It doesn't make sense...
yes ..............................................it...............................................does
blinkyblinky (author)  TheAwesomestDude3 years ago
I guess...

Not really.
yeah.........................................................................................................................
it does
blinkyblinky (author)  TheAwesomestDude3 years ago
I don't know...

Not really.
techhobbit3 years ago
Very good! I like it!
Did you try a single servo horn? ...that would give a full 360 rotation, and a little slower action.

This could be used to power "window" wipers on a pair of steampunk goggles, or drive an antenna sticking out the top of a hat! ...still very useless, of course, but with a slight oscillation of whimsy!

Hope you win the robot contest!
blinkyblinky (author)  techhobbit3 years ago
Good idea. I will try to use the single horn. Technically, it is not 360
blinkyblinky (author)  blinkyblinky3 years ago
This line says that it is a very clever idea. By the way ,I have no idea why it got cut off.

Thanks for the encouragement.
Robot Lover3 years ago
I can think of a way to do this without the chip. Modify the servo like in this ible', then substitute it for the motor in the below instructable.

http://www.instructables.com/id/How-to-make-an-H-bridge/

OR, an easier way would be this: Modify the servo like the above instructable, then build this circuit:


reversingcircuit.gif
blinkyblinky (author)  Robot Lover3 years ago
I know what you mean. I had thought of this but I didn't want to mod the servo. It was not cheap. I could have bought another servo but I didn't have enough time for the robot challenge.
batonas3 years ago
this is so fun :D
blinkyblinky (author)  batonas3 years ago
Thank you.