Special

Introducing the “Welcome to Xojo” Bundle!

New to Xojo and looking for guidance? We've put together a terrific bundle to welcome you! Xojo Bundle

This bundle includes six back issues of the magazine -- all of year 21 in printed book and digital formats -- plus a one-year subscription (beginning with 22.1) so you'll be learning all about Xojo for the next year. It's the perfect way to get started programming with Xojo. And you save as much as $35 over the non-bundle price!

This offer is only available for a limited time as supplies are limited, so hurry today and order this special bundle before the offer goes away!

Article Preview


Buy Now

Issue 22.3

FEATURE

Raspberry Pi Electronic Fun Part 7

Using a Transistor to Turn a DC Motor On/Off

Issue: 22.3 (May/June 2024)
Author: Eugene Dakin
Author Bio: Eugene works as a Senior Oilfield Technical Specialist. He has university degrees in the disciplines of Engineering, Chemistry, Biology, Business, and a Ph.D. in Chemical Engineering. He is the author of dozens of books on Xojo available on the xdevlibrary.com website.
Article Description: No description available.
Article Length (in bytes): 11,830
Starting Page Number: 66
Article Number: 22305
Resource File(s):

Download Icon project22305.zip Updated: 2024-05-03 11:26:58

Related Web Link(s):

http://abyz.me.uk/lg/lg.zip

Excerpt of article text...

Using a Transistor to Turn a DC Motor On/Off

The Raspberry Pi can deliver a small amount of current and voltage to power light circuits. Using the internal power of the Raspberry Pi to provide too much amperage or voltage to a motor can cause issues such as: 1) destroying a chip on the Raspberry Pi motherboard, 2) cause the power surge to reboot the Raspberry Pi, or 3) corrupt the OS or program due to low voltage. The way to prevent this from occurring is to use a transistor.

A transistor is a switch, where power can be from a larger power supply, such as a battery, and can be controlled through a light power source from the Raspberry Pi Board. This means that the Raspberry Pi board only needs to supply enough power to turn the transistor-switch on or off, and all of the heavy work is provided with a battery and a motor which makes the workload on the motherboard very easy.

NPN Transistor

An NPN transistor can be used as a switch. When the voltage of the base is above about 0.6-volts and the emitter is negatively charged (usually to the negative side of a power supply), then the transistor allows the circuit from the Collector-to-Emitter to flow (see Figure 1).

...End of Excerpt. Please purchase the magazine to read the full article.