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Ideation
Ideation
I suffered for a long time from overheating in my laptop, and I appreciate the importance of the cooling pad so I thought I can choose to make low-fed prototype of it.
Design/Preparation Process
Design/Preparation Process
Software and Material used:
For circuits simulation I used Tinkercad (online website), to test the connections before implementation.
The material used is regular card board.
Design and Preparations:
Electronic circuit:
Electronic circuit:
When it comes to electronic parts, it is recommended to look at the datasheet of each components to know the operating voltage and current ranges, polarity and if it is connected with more than 2 terminals, and this is very important to avoid damage that can affect all the circuits components.
This circuit consist of a dc fan and a RGB led so lets get more information about them.
RGB LED:
this component consists of 3 LEDs Red, Green and Blue, and it's emission the result of the 3 colors combination.
The 4 terminals of the RGB is like the shown as the common cathode is the longest terminal so the single terminal on one side is for Red and the two others for Green and Blue.
Notice that each color can be use independent of the other 2.
looking at the datasheet we notice that the range of voltage operation is 3-4 volts, so with the 5volts power supply we must use a resistor to protect it from high voltage damage.
But what a Resistor is?
resistor is an electronic element that is used to control the voltage that is delivered to a specific part of the circuit.
This resistor can be fixed as the previous one or changeable like (potentiometer).
Potentiometers resistance value varies between 0 ohm to the max value that is made to reach, here we will use a 1K ohm potentiometer (0 ohm- 1000 ohm)to control the amount that each color gain to give different color combination.
To simulate this part with Tinkercad open the website, then create a new circuit design, and by drag and drop you can easily bring all of the components to your design.
after dragging the power supply, RGB led and resistor now its time to set the connections.
by clicking on each components we can set it's parameters:
power supply voltage =5 volts.
resistor =220 ohm
now by connecting the 3 parts together we will try each terminal individually first.
the cathode the negative (Black) terminal of the power supply and the other led terminal to the positive (Red)terminal of the power supply through the resistor.
DC fan:
this one is much easier than RGB led it operates on 5volts with respect to the polarity.
Dc fan can be simulated by DC motor as they are theoretically the same,
Full Circuit Implementation:
by connecting all of the parts we described before wo get this diagram, the positive terminal of the power supply is connected to an on\off switch, then the power current divided between the RGB led and the dc motor, the cathode is connected directly to the negative terminal in both main components, and every color terminal is connected to a potentiometer to control the amount of each color.
With no problems in the simulation, we can go to implement the whole circuit on the breadboard, which is a board that is make circuits testing very easy, by fitting male terminals into it's female bins which are connected together as shown.
Development/Implementation Process
Development/Implementation Process
ِِِAs this assignment is desired to be implemented with card board it was easy to just make the cooling pad design.
WhatsApp Video 2024-03-17 at 01.54.49_1bc41615.mp4
Output components are the RGB led and DC fan, which are both controlled with common switch in parallel connection and 3 potentiometers with the RGB led.
Challenges:
Challenges:
Potentiometers fitting in the card board model was not usable at the first time but with trail and error, I could fix it by putting the breadboard at the edge of the card board to make it more usable.
The RGB blue terminal was not working properly, So with the Avometer short-circuit test I found that one jumper is broken. by replacing it the led worked properly.
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