### Author Topic: (For Admin) A few suggestions.  (Read 885 times)

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#### Mr. Ninja

• Jr. Member
• Posts: 35
##### (For Admin) A few suggestions.
« on: July 20, 2012, 02:02:38 PM »
Looking at your robot tutorials, and what I have been researching, I have a few suggestions.

1) A place for super capacitors in your battery tutorials, they actually look like (to me) a viable energy source.

2) A calculator for finding out how long a X amount of Farads will last on X current draw at X voltage.

Thats all, they were just a few suggestions. (You're doing a great job on the site)

#### Soeren

• Supreme Robot
• Posts: 4,672
• Mind Reading: 0.0
##### Re: (For Admin) A few suggestions.
« Reply #1 on: July 22, 2012, 02:22:17 PM »
Ji,

2) A calculator for finding out how long a X amount of Farads will last on X current draw at X voltage.
Any calculator will do. The formula is:
C*U/I
Where:
C = Capacity in Farads
U = Allowable Voltage drop
I = Current
So, if your start voltage is 5V and you can use it down to 4.5V at a 5mA draw, a capacitor of 1000µF will give you: 0.001F*0.5V/0.005A = 0.1 second

Super caps are good for very modest currents, like very low power controllers only.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?