Let's Make Robots!

confusion over what voltage/amp is needed to power a wifi camera...


i have this wifi camera: http://foscam.us/products/foscam-fi9821w-megapixel-wireless-ip-camera.html

I would have liked to have powered it either through the 5v output of raspberry, but i quickly learned that that would not work.

Now the specs aren't clear on the voltage or amps that it draws..but the dc adapter that it came with outputs 5v/2amps, so i figured at minimum i needed a power supply that does the same.

Dealing with power fluctuations


i have connected to my controller several sensors(2 IR and one Ping)  and a two servos.  I notice that when the controller is powered by USB and the servo is moving, the ping can not get a reading.  When powered by an external power source, it works much better, but occasionally does exhibit the issue where the ping can not get a reading.  

Using a MM, i observed the following:

Saberttooth 2x12 motor control issue with driving motor from RC car


I have an RC truck which i stripped and have kept only the motors.  I have tested that the motors work fine by connecting directly to a batter source.    Now i want to be able to control the motor using my Arduino Duemilanove + Sabertooth 2x12 (non-RC version).

I am certain i made all the correct connections based on the documentation: http://www.dimensionengineering.com/datasheets/Sabertooth2x12.pdf

using multiple MaxSonars


i'm reading this article regarding using multiple max sonar: http://www.maxbotix.com/articles/031.htm

It basically states that multiple max sonars can interfere with each other and goes on to describe how to essentially daisy chain them and take sequential readings.

Using Sabertooth 2x12 with motor and servo.


I have an RC car that i've stripped down to it's bare essentials.  It has one motor that provides forward/backward movement and it has a servo that turns the front wheels left/right.   I can use the Sabertooth 2x12 fine with the motor.  The problem is however the servo. 

L298 Overheating issue


First, i'm not very good at electronics/hardware (i wish i were, but i'm more of a software guy)..so please bear that in mind in case i say something really stupid.

I'm hoping someone can advise me on how to debug a hardware issue i am having with a controller based on the L298 chip. The problem i'm having is one where the motor is overheating, to the point where at one time it started to smoke.  When i retried hours later, the controller still seemed to work, but it would only drive one motor forward.