
Darathian
USA
Asked
— Edited

This thread www.ez-robot.com/Community/Forum/posts.aspx?threadId=4570 made me wonder if there is a spec sheet showing min/max voltages, current (per pin as well as overall for the board) etc on the new EZ-B pins / power inputs.
Thanks
From that thread, I wrote:
Thanks DJ
The trouble with putting a voltage regulator for all pins on the board is heat and limited current draw. For example, if you ran more than 5 servos the EZ-B v3 would get very hot. If you wanted to run heavy duty servos, you would need an additional power source.
Our new servos used for the Lever HDD Servo-motor and Rotation HDD Servo-motor use the HDD Servo. That servo is tolerant for 7.4 volts input - so it'll power right off the EZ-B from a LiPo Robot Battery 7.4v 1300mAh
The 5 volt tolerant means the digital pin can accept 5 volts of input. This is special to the choice of ARM processor we selected. All other ARM processors are only 3.3v - which would be practically impossible to use with any sensors, etc..
Cheers
All the servo/digital ports shown here have a voltage dependant on your battery?
hmmmm.
Well, I don't think it will effect my roli project.
Oh wait. I have a mini servo!...... What's the max voltage the mini servo in the shop?
Yes.
If 7.4v is a problem you can always fit a regulator before the EZ-B and supply the EZ-B with whatever voltage you require however current will be limited by the regulator. Parallel multiple regulators and you can increase the max current available though... I.e. put 10 x 5v 1A regulators in parallel and you have 5v 10A to play with on the EZ-B's digital pins (provided 5v is enough to power the EZ-B).
Or, you can fit regulators in the Vcc of the digital ports. The VCC powering the servos can all be taken from the same port if required so if you have 2 or 3 micro servos that require 5v you could take signal from D0-D2, take the vcc and ground of D0 through a 5v regulator then feed the three servos with the same regulated Vcc and common ground.