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Recent Posts

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Electronics Marketplace / oscilloscopes for sale
« Last post by callittwo on January 11, 2019, 07:24:28 AM »
I have two oscilloscopes for sale
Hamed 407 and LG 5020

£120 for the hameg and £60 for the LG both in full working order,anybody is more than welcome to come and have a look,Im in sheffield s36 4gy in the uk  tel:07891903013
Electronic Parts / Re: want to connect my Arduino UNO
« Last post by AJ_36 on December 06, 2018, 08:55:13 AM »
Hello !

I want to connect my Arduino UNO to a One Relay Switch Board.
I also want to connect relay to a Fan, TubeLight etc

Relay connections :  POLE, NO, NC,

Please can any one explain me the connections Please.


It is very easy to connect a relay to Arduino or any micro-controller for that matter. Since you have mentioned "Relay board" I am assume it has the relay driver circuit build on it.

If you can find a transistor, resistor and diode on top of your board then it probably has the driver circuit. If not make sure you add one else your Arduino will not be able to provide enough current for your Relay to trigger.

There are many types of relays the one you have is possibly a 5V 5-pin relay. You should connect the load, in your case light fan etc to the  POLE, NO, NC (any two) pins. Also note that pole pin is commonly refereed to as common pin also. You can find more details of the relay in the below link.

You AC loads will have two terminals Phase(live or hot) and neutral. Connect the Phase wire to the Phase of your AC mains. You will add the switch (relay) only to the neutral side. Connect the neutral wire to the pole pin of your relay and then connect the NO pin of the relay to the Phase.

This way your load will be turned off till the relay gets triggered. When the relay is triggered form the Arduino, the neutral will be connected to the AC main completing the circuit and thus turning on the load.

I know its a very late reply, but hope it would help people to come in future.

Motor Control / Re: BLDC sine wave using a L298n
« Last post by orion_pt on January 05, 2018, 12:02:24 PM »
I'm doing exactly the same and having the same problem as you. I also increased number of steps and it improved. The 10 bit resolution makes it worse but reducing the pwm speed makes it better but you get the frequency noise. I think the 298 is having problems with pwm signal creating noise in the output. Could it be necessary to have DAC between arduino and the 298 or a different driver would be a better choice?
Motor Control / BLDC sine wave using a L298n
« Last post by navanod on January 03, 2018, 04:05:26 PM »
Hi all and greetings.

I have been working on a BLDC project for a while trying to use the sine wave tables to generate like it was shown in the stroboscope project.  I do get movement but it is certainly not as smooth as I would like,  I have tried more steps and this helped a little but still not great.

I am wondering id this is really not the fault of the l298n?

Ive got one dev kit from TI here for a fancy fan controller and at 7 hz the same motor is silky smooth.

love to hear your thoughts on the old L298n for slow speed bldc control.

Electronics Repairs / Re: List of Seagate firmware terminal commands
« Last post by SALIM on December 16, 2017, 10:30:04 AM »
Hi to all

i need help for LEVEL 2 and LEVEL 7

Level 2 'I': Rev 0011.0001, Overlay, DisplayModifyAdaptiveParm, I,[GroupId]

Level 7 'I': Rev 0011.0001, Overlay, DisplayModifyAdaptiveParm, I,[GroupId]

Please few words,  how to use this CAPITAL I


Electronic Parts / want to connect my Arduino UNO
« Last post by mishmalik on July 11, 2017, 05:07:13 AM »
Hello !

I want to connect my Arduino UNO to a One Relay Switch Board.
I also want to connect relay to a Fan, TubeLight etc

Relay connections :  POLE, NO, NC,

Please can any one explain me the connections Please.
Electronic Parts / want to buy arduino
« Last post by mishmalik on July 11, 2017, 04:41:56 AM »
Please help me in buying an Arduino starter kit. I am new to Arduino, and I am looking for Arduino starter kit. I found this starter kit via google
General Discussion / Brushless Motor Theory
« Last post by Phebex on May 24, 2016, 05:20:58 AM »
i think it's fine om posting here.

i found interesting site
Check this site this site talk about Electrik Motor.
Even You can calculated here Winding Calculator.

From that site i found my brushless(14 magnet pole and 12 cogs) has Direction AabBCcaABbcC and AbCaBc

12P9C Brushless | Direction : A-B-C-A-B-C

14P12C Brushless | Direction : AabBCcaABbcC or A-b-C-a-B-c-

from here i'm confuse how to make diagram like you do. if I had to make a table size 12x6 (due in accordance with the number of his COG) or a 7x6. I do not know how to determine the level. I also attach a file containing the tables.

one more ask, in that site you can found winding animation.

fig. 01

when you click it there is any step for windings

fig. 02
Please tell me, that is step if i'll make a winding isn't?! not steps like you do in Driving a three-phase brushless DC motor with Arduino – Part 1. Theory

*My Attachment : Google Drive
Member Introductions / Re: Try to study here ;)
« Last post by Phebex on May 23, 2016, 01:49:03 AM »
That fine if you are busy now.

My Brushless is
MARSPOWER 220880T Brushless Gimbal Motor, you can google it, but hard to find datasheet.
there is 14 pole and 12 cogs.
Yes, after I tried to understand the theory of brushless (trigonometry). I also suspect that. there may be a step is missed.

Sorry if it makes you misunderstood. im not using h-bridge at a trial, This trial temporarily halted, because I'm ordering the item.
Member Introductions / Re: Try to study here ;)
« Last post by ElectroNick on May 22, 2016, 02:59:53 PM »
Hello Phebex,

Thanks for stopping by my blog/site.

I have to admit, it's been 5 years since I've done the original post you are referring to, and some of the finer details of the software would not be immediately apparent to me now. At least until a careful review, for which I have to admit I don't have a lot of time now. But I will try to at least validate some of your own concerns.

You are absolutely right - the phases of a 14-pole/?? cogs motor will be different than 12-pole/9cogs . You would need to modify the software to have more (I assume more - depends on the # of cogs) PWM steps. Otherwise the rotor will be skipping some of the positions which can lead to uncertain movements - sometimes the next    step in the software would result in the back step rotation of the physical rotor. Which is, I think is what you are experiencing.

I am not so sure how you can make it work at all without using an H-bridge. Arduino's  40mA outputs are not strong enough to drive anything in the physical world (maybe except for the tiniest of the stepper motors). Certainly not any gymbal BLDC I've ever seen. Perhaps you meant "no integrated H-bridge circuit", which would mean that you are using an H-brdge on discrete transistors? I don't know what you mean but if you did not, you should really look into employing one kind of an H-bridge circuit or another. Otherwise you will either fry your Arduino or it simply won't work.

Good luck!
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