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46  Topics / Robotics / Re: Are these components compatible? (chassis/motorshield related) on: December 18, 2011, 06:35:18 pm
Would someone verify I am looking at this correctly?  It looks like either could handle the green motors, but not the yellow motors unless you prevent the motors from stalling.

http://www.robotshop.com/dfrobot-4wd-arduino-mobile-platform-4.html
Indicates a stall current of 470mA @ 6 volts for the green motor and 2.8A @ 6 volts for the yellow motor.
The chassis appears to use 4 motors, so if your driver is 2 port, you would need to double the stall currents as you would have 2 motors on each port.

http://www.adafruit.com/products/81
provides 4 channels of 0.6A continuous capacity (each sufficient for the stall current of the green motors)

http://www.amazon.com/DFRobot-Motor-Shield-for-Arduino/dp/B006D85PAS/ref=sr_1_4?s=electronics&ie=UTF8&qid=1323643740&sr=1-4
provides 2 channels of 2.0A continuous capacity (each sufficient for the stall current of 2x green motors)
47  Using Arduino / Project Guidance / Re: arduino adc on: December 12, 2011, 09:33:49 pm
If I was going to guess, I would say check the connection from the slider on the pot to the inputs on the chip.  That output looks like open input float measurements.


Could you show us your circuit diagram? That would allow a better diagnosis.
48  Using Arduino / Project Guidance / Re: Need help with simple motion sensor on: December 12, 2011, 09:08:22 pm
This looks like your problem:


It looks like you have all your pins on your sensor on the same strip on the protoboard, so they are all connected to each other instead of you power, ground, & I/O lines.
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