Hi, I have been using Arduino for a year and I am in love with it. Im currently building a robot and Im in the final phase of hardware assembling. My robot is a PIR security bot with wireless camera mounted on it. A Sharp IR detector is used for turing the camera up or down and stop the bot before it hits something. The bot can also be controlled via a hacked RC board.
Every singal circuit I've soldered are tested to work fine. However, yesterday night when I was trying to put all the things together I found out its not workig well. The motors move only when I unplug the power source of the Servo and Ardunio (which was also powering the IR detector and a LCD). I was using 2 9V battery to power these things. I guess it may be my power (current supply) is not enough. I have ordered a 4600mAh 7.2V battery on ebay an hour ago and I hope it will work out fine.
In my current design, I didnt connect the 2 9V batteries in parallel. Each 9V battery powers different stuff.
9V battery 1: Arduino, LCD, IR detector, 4 PIR sensors, AND gates (74LS32)
9V battery 2: Servo, Remote control board, 2 Motors (wheels), OR gates (74LS08), L293D motor controller IC.
I figured out that the Remote control doesnt work only whe I m sending signal to the Servo. (At that moment, nither the servo or the motor spins). If the MCU is powerd off and Servo is unpluged, I can remote control the bot but it is pretty slow comparing to my test on just the remote control and the motors I've done before.
Is there anyone think that the supply current is not enough. I hope I get this right. :-[