Can I control servo just by connecting it to my Nano?
Shouldn't I use "ArduMoto - Motor Driver Shield" for controlling it?
What is that shield for?
http://www.coolcomponents.co.uk/catalog/product_info.php?cPath=50_76&products_id=306
Can I control servo just by connecting it to my Nano?
Yes, if the current requirements are low enough. Otherwise, no.
The shield is needed when the current requirements of the motor being controlled exceed that of the Arduino pins (about 20mA).
if you use an external power source to power the servo's then you can hook them straight up. just don't forget to connect the grounds if you use a different power source on your arduino!
That shield is for driving dc motors, is it not? Not servos.
If the current requirement is fine, drive it from the nano. But if it is too high current drawing, then just connect the power and ground of an external power supply, then the signal pin and ground from the arduino.
Hi there
this is a question that should be obvious now but it's still not materializing for me so I put it forward:
I have two servos hooked up to my nano 168 and they run very well off USB but not with external power. I haven't used a nano in awhile but I thought this would work. The servos aren't powered by the nano but off a 5v regulator and the grounds are connected and I have 5v going in pin 27(5v pin). Am I killing the current or something? Off my desktop power supply it goes but stutters and the lights blink.
Thanks for your time!
First, I don't know if the servos will run off of 9v.
Either use a regulator or some other power source.
Second, 9v batteries are horrible for driving motors. Use a bunch of AAs.
Third, Arduino ground has to be connected to the battery ground.
Most servos are rated for a range of 4.8 to 6.0 VDC; maximum torque occurs at 6 volts, obviously. Feeding 9 volts into a servo would probably burn it out in short order (if not the motor, then certainly the control electronics). Using a 5 volt regulator would be the better option, but the best option would be to use a 6 volt regulator (like a 7806) to obtain the most torque.
Sorry, im noob. I thought that if i feed 9V battery to servos, they both get 4.5V
L7806CV Voltage Regulator looks very interesting -
"... will provide a fixed output of 6 volts (5.75-6.25V in reality) from an input voltage from 9V to 35V" - SO IT REALLY DOESN'T MATTER WHETHER I USE 9V OR 35V POWER SUPPLY? SHOULDN'T I USE RESISTORS?
you do that by hooking them in parallel, and i dont think that works with servos... but you could try it... hook servo 1's posotive to +9 and servo 2's negative to 0 volts... then you connecto the two repaining wires together
Below is a setup I use to get both 5v for a 5v chip and 5.7v for a servo from a 7805 regulator chip. The 7805 chip may be easier to find than a 7806.
Why are there diodes? Do I also have to use diodes when powering 2 servos thru 7806/7805 ?
Jeremy,
That is called series, not parallel.
Decepticon, don't try it!!! It could probably damage the servo chips, etc.
And also that idea definitely would not work.
~~And decepticon, the diodes are I think to protect against noise from the servos.~~Nvm its wrong, just a guess :-[. The guy below me has the real answer.
Why are there diodes? Do I also have to use diodes when powering 2 servos thru 7806/7805 ?
The diode on the ground leg of the 7805 increases the output voltage of the 7805 from 5v to 5.7v (increase in voltage equal to the voltage drop across the diode). The servos have better performance at 5.7v than 5v. The diode on the output of the 7805 reduces the voltage back to 5v due to the .7v voltage drop across the diode. That diode also serves as an electrical check valve to prevent electrical reverse flow from the 10uf capacitor, which is helping maintain 5v to the servo control chip. The starting current of the servos can cause a momentary voltage drop that could affect the servo control chip without the diode/capacitor setup. Two cam pan/tilt servos are powered off of this setup. Note that the 7805 is designed for only ~1a and not heavy loads.
sciguy
gosh and i knew that, too... i just said the wrong thing... im an idiot
Will this plan work__?__
Doesn't work... something is not right
I bought 7806CV that is rated 1A... there was also same thing with 0,1A
I dont know if i bought the right
are you sure you wired it right? input on the leftmost from front view, ground in the middle, and output on the right. seems like its time to bust out the voltmeter.