Is there any way that you could build a motor sheld?
I procured a motor shield that fits neatly on the top of the Arduino.
I do not know how to code it with the Arduino so that I can run it in forwards and backwards.
... the emitter to the motor (with the other lead attached to ground), the collector to the 5v output on the arduino. ...
But I have no idea why it should be so.... what's wrong (if anything) with having the load downstream, on the emitter to ground?
If its smaller motors that you want to control, you need variable speed, or more options, and the motors are around 1A (Peak) or smaller, I would recommend a motor shield. I personally use the "Adafruit Motor/Stepper/Servo Shield for Arduino kit - v1.0"Its about $20 for the unassembled one and is also a great way to learn about basic soldering.Here's the link: https://www.adafruit.com/products/81
Quote from: jaredpi on May 30, 2012, 07:23:19 PM... the emitter to the motor (with the other lead attached to ground), the collector to the 5v output on the arduino. ...
I've always understood that the load should be upstream of the transistor, between the collector and the +ve supply.http://www.danielsoltis.com/notdatasheets/BC547.pdfBut I have no idea why it should be so.... what's wrong (if anything) with having the load downstream, on the emitter to ground?
Because the common emitter configuration of an NPN transistor has a higher current gain than the common collector configuration. This means that the base draws less current for a given amount of load current in the common emitter configuration. By placing the load on the collector side, you are increasing the load on the Arduino output driving the transistor.
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