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Old 08-07-2015, 01:32 PM   #1
tracert
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Default Simple control a DC motor via Arduino UNO

hi sirs, this is my first topic in this forums ..
i want to control a 12v and a 5v dc motor with 2 terminals only .. not steppers .. and i have not a drive motor shield or its IC. i want not to control their speeds but enable and disable them by my arduino and i fear of high current that can reverse on arduino borad even from a simple 1.5 volt motor so i prefers safety first ..
all i have - my arduino uno & these 2 dc motors and 2 tansistors S15D40 & bld135d
that in my hand at time so can i use them instead of mosfet trans. ? and keep the arduino safe .. knowing that
my pwer source is 12/5 v with 2A
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Old 08-10-2015, 05:27 PM   #2
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Default

BEMF diode in the event that sudden disconnection of power.
Normally a DC motor that is controlled, generates a DC voltage in the same polarity as the supply, and opposes it.
If turned off suddenly a BEMF in the opposite polarity can occur which is suppressed by the diode.
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