Motor Shield doesen't move dc motor but i can hear a whistle

Other Hardware Motors, Mechanics, Power and CNC
1

Hi everybody! This is my first arduino project.

I'm trying to hack an rc car supplied by a 7.2 V, 1800 mAh, i want to replace the motor controller with an arduino UNO and a Motor Shield DK Electronics, buyed on AliExpress..
I've wired the EXT_PWR with a row of 5 AA IKEA Bateries, 1.5 volt, 1500 mAh each, removed the jumper between Arduino and the Shield, suppling Arduino via USB connection.

I've downloaded the adafruit motorshield library v.1, followed all steps to install it, wired the motor to motor port 4 and uploaded the motor Test default Sketch.

Motor doesn't move but i can hear a whistle coming from it.
Testing on a multimeter i see that the shield supplies from 0 to 1.4 A
Also wiring a simple LED it brights but has a dim light.

This happens for each DC motor port, and also with an other smaller motor.

Note: the motor supplied directly from the battery works fine!
It seems that arduino / the shield give to the motor too little energy..

I don't understand what's wrong, have you any idea?

Thanks :slight_smile:

dew

2

Post a link to the product page for the motor shield.
It probably can't supply enough voltage and current.

3

http://it.aliexpress.com/item/New-Motor-Drive-Shield-Expansion-Board-L293D-for-Arduino-Mega-UNO-Duemilanove-FREE-SHIPPING-3230/1310044513.html?ws_ab_test=searchweb201556_1_79_78_77_80,searchweb201644_0,searchweb201560_9

here it is.

4

jremington:
Post a link to the product page for the motor shield.
It probably can't supply enough voltage and current.

how can i fix it?

5

That motor driver can supply only 600 mA per channel. For a typical RC car, you need one capable of several amperes, like this one.

You need to know the stall current of the motors and plan accordingly.