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Electronics => Electronics => Topic started by: SUTO the G on March 03, 2013, 03:01:34 PM

Title: How to decide if a part is compatible with another (in general)
Post by: SUTO the G on March 03, 2013, 03:01:34 PM

I know checking the datasheet! But I would like a more precise answer!
For example for what do I have to be aware if I am trying to match a development board a battery pack and a servo! I mean what to look for in the datasheet?

Title: Re: How to decide if a part is compatible with another (in general)
Post by: waltr on March 03, 2013, 06:40:57 PM

Maximum and Minimum Battery Voltages matched to Min & max Voltage for Dev bd and Servo.
Don't exceed the max Voltage rating the the Dev bd or servo.
Expect the dev bd and/or servo to stop working properly if the battery drops below their min Voltage.

Maximum current draw from dev bd and servo to the max draw allowed from the battery.

The Voltage Logic levels on the Dev bd outputs to the Servo logic input (control line).
Does a logic high output match a logic high input and a low match a low.

Title: Re: How to decide if a part is compatible with another (in general)
Post by: SUTO the G on March 25, 2013, 10:00:57 AM

How can I tell what is the voltage logic level of this board: http://arduino.cc/en/Main/arduinoBoardUno (http://arduino.cc/en/Main/arduinoBoardUno) (I can`t seem to figure it out)!
And what is the voltage logic level required for the control line of this servo: http://www.servocity.com/html/hs-311_standard.html(I (http://www.servocity.com/html/hs-311_standard.html(I) am assuming it is 3-5V, but not sure I am a beginner) "Required Pulse: 3-5 Volt Peak to Peak Square Wave"

Title: Re: How to decide if a part is compatible with another (in general)
Post by: newInRobotics on March 25, 2013, 12:19:48 PM

Quote from: SUTO the G on March 25, 2013, 10:00:57 AM

How can I tell what is the voltage logic level of this board: http://arduino.cc/en/Main/arduinoBoardUno (http://arduino.cc/en/Main/arduinoBoardUno) (I can`t seem to figure it out)!

http://arduino.cc/en/Main/arduinoBoardUno (http://arduino.cc/en/Main/arduinoBoardUno) --> "Operating Voltage   5V"

Quote from: SUTO the G on March 25, 2013, 10:00:57 AM

And what is the voltage logic level required for the control line of this servo: http://www.servocity.com/html/hs-311_standard.html(I (http://www.servocity.com/html/hs-311_standard.html(I) am assuming it is 3-5V, but not sure I am a beginner) "Required Pulse: 3-5 Volt Peak to Peak Square Wave"

That's correct.

Title: Re: How to decide if a part is compatible with another (in general)
Post by: SUTO the G on March 25, 2013, 01:12:19 PM

"Operating Voltage   5V"

But we were talking about the Boards servo controls output voltage not the Operating Voltage, or these are the same?
What is the Boards, and the Servos logic high and logic low voltage level?

Title: Re: How to decide if a part is compatible with another (in general)
Post by: SUTO the G on March 25, 2013, 01:18:58 PM

Quote from: SUTO the G on March 25, 2013, 01:12:19 PM

"Operating Voltage   5V"

But we were talking about the Boards servo controls output voltage not the Operating Voltage, or these are the same?
What is the Boards, and the Servos logic high and logic low voltage level?

Title: Re: How to decide if a part is compatible with another (in general)
Post by: Azraels on March 25, 2013, 06:38:14 PM

Suto, all you have to worry about is giving the Arduino 7-12 volts when your using the power jack or Vin pin to power your Arduino. The Arduino has a built in 5v regulator that will give you what you need for the logic control of the Servo.
So yes you can plug the servos position control directly to an output pin of the arduino.
While your using the USB it is still getting 5v and still the same.

Title: Re: How to decide if a part is compatible with another (in general)
Post by: jwatte on March 25, 2013, 08:51:23 PM

Also, make sure to connect the grounds of the servos and of the Arduino! Easiest is to connect the gnd or "-" connections of the servo power and the battery power together.