Arduino Adjustable Power Supply With OLED Display And 3D Printed Case

[@giginmathew1]

Super professional quality work schematic and hardware

[@HMProjects]

Thanks!

[@brouwereric644]

Very nice project. May you enjoy the PSU for many years to come.

[@ripinbudisetiawan2696]

is there a short protector?

[@ajuwinfly8272]

Good 🎉 project 🎉🎉

[@raffaelebarlotti9017]

Hi, I made the PCB for the fourth time but the result doesn't change, it doesn't work well! Are you sure that the R4 and R5 resistors are 10K and 5K7? Thank you.

[@raffaelebarlotti9017]

Hi, I made the circuit but I have some problems: 1-the measurement of the volts is not exact and even with the trimmer I can not set it, the difference is +6 volts; 2-The traingolino at the bottom that runs (as shown in the video) does not appear; 3-It does not measure Ampere and Watt, always zero. What could these errors be due to? Thank you.

[@raffaelebarlotti9017]

OK thanks! I would also like to know 2 other things: 1-Is the input voltage only 12V? 2-The R6 and R7 trimmers are used to regulate what? Thank you.

[@HMProjects]

Yes, the input voltage is 12 volts but I used a xl6009 buck/boost converter in order to have an output voltage from 1.2V to 30V, but my buck/boost converter during testing it broke so I replaced with a LM2596 buck converter so that's way I got only 11.6V or so on the output. On the second question, with the R6 you can adjust the voltage reference of the voltage sensor in order to have a precise voltage reading on the display, it can be done in software but this way is much easier, you compare the output voltage shown on the display with a multimeter and adjust from the R6 trimmpot until you have same value as shown on the multimeter. The R7 you can adjust at which temperature the cooling fan will start to turn on, here as well you can measure the temperature of the heatsink with a thermometer and adjust from R7.

[@raffaelebarlotti9017]

Hi, tell me please, what should I do to be able to view the exact output voltage? The real output is 12V but 20V is displayed and it is not adjusted with the trimmer either. Thanks.

[@HMProjects]

Hi. Sorry for the late reply. First of all double check if didn't make any mistake and if everything is as in the schematic at the "voltage sensor", it has to be exactly the same values of the resistors used in the voltage divider. If you didn't use same values you have to modify in the code because there is a "balance" between the value in the code and the values of the resistors of the voltage sensor. You can try to modify the code at the lines 17 and 18, increase or decrease by little the value in the code " R1 = 10000.0;" " R2 = 2940.0;" this are the values for the voltage divider AKA " voltage sensor ".

[@raffaelebarlotti9017]

@@HMProjects Ok, the two values ​​have to be increased or decreased together or increase one and decrease the other? Thanks.

[@HMProjects]

@@raffaelebarlotti9017 Try first at the line 18 only.

[@hamedmansoory553]

Hi very good job How can I create the voltage and especially the current with the accuracy of one milliampere on the screen؟ Thank you for your guidance

[@ravikesari3877]

Can you do some modifications to make it adjustable up to 100-200 volt?

[@yuriselektro2236]

Nice project brother.. 👍👍

[@HMProjects]

Hey, thanks!!

[@raffaelebarlotti9017]

Hi, another great project! From the Mini360 how many volts should 5 or 7V come out? Thank you.

[@HMProjects]

Hi, thanks! 7V, since the voltage regulator of the Arduino Nano is 5V, the voltage on it's input has to be a bit higher otherwise on it's output the voltage will be 4V or so.

[@aldythsatya601]

Hi, Thanks for sharing the code, this is a very interesting project and I'm interested in making it. I want to ask you how many amperes the "ACS712" sensor you use? Because the reading for each Amper between a 5A and 20A module, for example, is different. Where can I change the sensor value readings to suit the module I use? Thank you very much

[@ahmadrofiki6146]

how to set current?

[@raffaelebarlotti9017]

Hello, the capacitor connected to the Mini360 what is it for? It is necessary? Thank you.

[@HMProjects]

The Mini360 have quite big output ripple due to small capacitance on the output, and run quite hot, due to it's size they have to make some compromise and use that little capacitor on the output, increasing the output capacitance to 100uF electrolytic capacitor I solved both problems from above, no more output ripple and the converter it's running cool.

[@raffaelebarlotti9017]

OK, thank you for everything! One last thing, can I use the TIP41C instead of the TIP122?

[@HMProjects]

Yes, you can use TIP41C transistor.

[@berdohan1]

good job. Thanks for everything

[@raffaelebarlotti9017]

Hi, I made various tests and changes to the sketch but the result does not change, it does not work! I checked the resistors and they are ok (R1 and R2 2.2K, R3 10K as per attached diagram). I really like the project but it doesn't work for me and I don't know what to do anymore, could it be a sketch problem? Thanks.

[@HMProjects]

Hey sorry for the late reply. I'm sorry to hear that it's not working for you, you're definitely doing something wrong, the R1, R2 ( 2.2K ) is current limiting resistors for LED's, for the voltage sensor are R4( 10K ), R5 ( 5.7K you can put two in series to have this value ) and R6 ( 5K trimmpot ) together forming the voltage divider and from the voltage divider to pin A1 of the Arduino and make sure to put a 5V zener diode as in schematic otherwise you can burn the Arduino if you exceed the 5V from the voltage divider. Re-check the schematic and the pcb that you made and see where you did it wrong, if it works for me it should definitely work for you. I wish you success!

[@raffaelebarlotti9017]

From the video, you can't see well, but it doesn't seem to me that R4 is 10K?

[@vobinhthu5299]

This project is very good!

[@HMProjects]

Thank you!

[@FineRhodium]

Hi, gm, can u design powersupply like this of 0 - 20V # 0 - 50A ?

[@HMProjects]

It's possible but the power supply will definitely be not such portable and a lot bigger.

[@imnotbeluga007]

What do you need a kilowatt power supply for?

[@mehdizeynalov1062]

it seems that this device will fall apart if you touch it harder :) but thanks, interesting project.

[@ahm85ed]

انسان راقي جدا دعائي لك يالموفقية

[@mobilesurgerybd]

Dear sir how to contact with you?

[@timmyg37]

Clever chap...

[@moobdi3]

Awesome

[@fikri2690]

Please add memory ch 1 ch 2 ch 3

[@giorgostsobanakis5673]

αλλα δειχνη και αλλα δουλευουν μας κοροιδευει

[@gguy156]

So basically the arduino is the voltmeter plus the cooling controller. I think it's quite overkill to use arduino here.