Arduino code. PWM duty cycles. NPN transistors, external power source.

hi sir i am an expert electrical engineer I can do it for you I have almost 4 years of experience in this field. I have done a number of projects on arduino I am waiting for your reply to start regards

Hi, I am a post graduate power electronics engineer and having excellent design and development knowledge in power supplies,SMPS,DC-DC,AC-DC,Battery chargers design using different topologies like flyback,push pull,boost,buck,Forward and buck boost. I have design experience from few watts to KW range using universal supply range. I understand your requirement and ready to work for you. Please contact me for further discussion.

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Dear Hiring Manager, I can perfectly do the desired job for you. I will provide you the code + circuit diagram so that you can build the prototype on your side. Regards.

Hi, I have more than 11 years of experience in embedded systems . I have done several similar projects on arduno uno. Regards, Ratheesh

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Good Day! It's good to find project like these where I would be able to use my experience to help others. I have been using arduino for the last 3 years and I have just finished some subjects about transistors. With these skills, I am very fit for this job. I hope to hear from you soon! Thank You :D

Hello, The solution to your project is to use MOSFETs generally they spend less power and so save you a lot on heat sinks. The code is very simple as the schematic itself. The whole schematic is 2 MOSFETs and 2 resistors. However interfacing MOSFETs with arduino is not really easy since the Arduino works on high frequency with it's PWM so this needs to be fixed or the lamps won't light up or the transistors will heat up. I can send you the design in matter of hours of awarding. Of course I will test the schematic first and make a short video of it working. If you have any questions, don't hesitate to ask me trough Freelancer. Best Regards, Mihail Vrachanski

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A proposal has not yet been provided

I create 100 times more complex circuit diagram in minutes. My offer is not only to provide the diagram needed, but to also support you in the process, help select the proper components, and make sure I get a happy customer, whatever it takes. This is my first ever bid on the Freelancer, and my true motivation is positive review, not the money. For example I would really suggest logic level MOSFET for this application, rather than bipolar NPN, because of their low ON resistance, and low voltage drop, and simpler control on the input side. If you so desire I can provide diagram with NPN transistors, but there will have to be either major voltage drop (at least 0.5V) between collector and emiter in the ON state, or if allowed to go deep into saturation, the voltage drop may be as low as 0.3V, but the switch-off time will be longer, causing loss of resolution at higher outputs. To clarify, high pulse width values are likely to merge together into continuous ON state. I would need a bit of clarification on your existing components: 1 - Are the light bulbs rated for 5VCD? 2 - Is your existing power supply capable of driving the light bulbs in their full ON state, with only minor drop of voltage? 3 - 2 lamps with 2.5ohm resistance have combined resistance of 1.25 ohms. Theoretically they will draw the current of 4 amps. Your power source has capacity of 3 amps, and is therefore underpowered. If both lamps have to be at max. intensity at once this could be a problem. Thanks, Dario

Hello, I am Sameer. I have done masters from Indian Institute of Technology India post my graduation in Electronics. I am currently working with an Automation based start up as a consultant. I have done a number of projects based on Arduino and sensors. I recently completed a "Arduino based Child Safety System" project for a Michigan based client and the product will be in the market soon. I have also done a certification on "Embedded System" from University of Texas. So I strongly believe that my expertise will meet your requirements. Feel free to contact if any further clarification is required. Anticipating your kind and prompt response. Thanks & Regards Sameer Chouksey +91-8126365050

Dear sir/madam, I have been in this field for 4 years and such jobs are my daily practice. This is my first time on this site and hence you can see that I do not have any ratings/testimonials to show you. I can assure you that if you work with me once, you will always work with me for these kind of projects. Please feel free to see my previous jobs in my portfolio. Thank you.

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Previously i had faced such problem while making robot where DC Motor were used instead of lamp. So i can solve this with what is given. If you need further optimization i will also help you with that.

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Hi, Have done something similar to this in the past, but have used MOSFET's. Am interested in finding out more Thanks Jason

I can guide you with the use and application problems of the Pulse Width Modulation in the Arduino. Since you are using the 5v DC to guide the bulb then there would be not much difficulty in doing, except when you be shifting to the ac source as that case will involve Zero Crossing Detection.

Hi sir. Its my pleasure to do this job...i already done projects related this projects. please contact here is my Whats app number (+923335002667)

I can help you to improve your project I have good experience on this projects I use PWM to control Motors Speed in another Projects