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by hesam_m
Thu Jul 18, 2019 7:02 pm
Forum: Automation, sensing and robotics
Topic: A Powerful 30A DC Motor Driver [Can be controlled by Arduino or Raspberry Pi]
Replies: 0
Views: 102

A Powerful 30A DC Motor Driver [Can be controlled by Arduino or Raspberry Pi]

Please mention your opinion about this circuit and PCB design. Thank you. Article source: http://bit.ly/2LRBYXH Abstract DC motors are everywhere, from hobby applications to robotics and industrial areas. Therefore there is wide usage and request for suitable and powerful DC motor drivers. In this a...
by hesam_m
Sat May 25, 2019 4:46 pm
Forum: Automation, sensing and robotics
Topic: An easy to build PWM controlled DC motor driver
Replies: 6
Views: 619

Re: An easy to build PWM controlled DC motor driver

Yes, but you are not bounded to use it, of course it is better in terms of thermal dissipation, but you can use a package without that exposed bottom pad. it makes no difference in the operation That bottom ground pad soldering needs a hot air station of course (although it is cheap to buy) Okay, b...
by hesam_m
Sat May 25, 2019 4:38 pm
Forum: Automation, sensing and robotics
Topic: Connecting an HD4470 character LCD to the Raspberry PI (or an MCU) using just two wires I2C
Replies: 12
Views: 807

Re: Connecting an HD4470 character LCD to the Raspberry PI (or an MCU) using just two wires I2C

Thank you for the notes. the last issue can be solved by placing some Vias which I do regularly, but not for this design. No problem. I know that it can be solved by a couple of Vias :) . But the question is more why you didn't it ;) :geek: I realized it is not that much important for this circuit,...
by hesam_m
Wed May 15, 2019 10:35 am
Forum: Automation, sensing and robotics
Topic: Connecting an HD4470 character LCD to the Raspberry PI (or an MCU) using just two wires I2C
Replies: 12
Views: 807

Re: Connecting an HD4470 character LCD to the Raspberry PI (or an MCU) using just two wires I2C

I have a couple of advise for your design: I would place above R5, R7, R8 also a resistor and mark them as "np". So there is an option to change the adress of IC1, if you need more then one. I would place a small electrolytic capacitors as well on that board I think you can better increase the pull...
by hesam_m
Mon May 13, 2019 7:17 am
Forum: Automation, sensing and robotics
Topic: An easy to build PWM controlled DC motor driver
Replies: 6
Views: 619

Re: An easy to build PWM controlled DC motor driver

it is not tricky to solder such a component at all. I can solder smaller than this, even near 0.2mm with just an ordinary iron and some flux. I saw that you are using the chip with the exposed pad at the bottom. And it is important that that pad is also soldered correctly. Not all people have the e...
by hesam_m
Fri May 10, 2019 9:58 am
Forum: Automation, sensing and robotics
Topic: An easy to build PWM controlled DC motor driver
Replies: 6
Views: 619

Re: An easy to build PWM controlled DC motor driver

it is not tricky to solder such a component at all. I can solder smaller than this, even near 0.2mm with just an ordinary iron and some flux.
by hesam_m
Fri May 10, 2019 9:53 am
Forum: Automation, sensing and robotics
Topic: Connecting an HD4470 character LCD to the Raspberry PI (or an MCU) using just two wires I2C
Replies: 12
Views: 807

Re: Connecting an HD4470 character LCD to the Raspberry PI (or an MCU) using just two wires I2C

Or on ebay. 16x2 display + i2c module £2.50, if you're prepared to wait for it. And most of the ebay ones can be driven using RPLCD using both the gpio parallel method and the i2c modules. https://pypi.org/project/RPLCD/ It is not weird to find similar designs, these are not inventions, there are c...
by hesam_m
Tue May 07, 2019 4:41 pm
Forum: Automation, sensing and robotics
Topic: An easy to build PWM controlled DC motor driver
Replies: 6
Views: 619

An easy to build PWM controlled DC motor driver

Motor driver circuits are one of the most useful designs for industrial, automotive and robotic applications. Full control over a DC motor is an essential function for a variety of applications. For many low power applications, 1A to 1.5A RMS current consumption limit/per motor is enough, therefore ...
by hesam_m
Tue May 07, 2019 11:44 am
Forum: Automation, sensing and robotics
Topic: Connecting an HD4470 character LCD to the Raspberry PI (or an MCU) using just two wires I2C
Replies: 12
Views: 807

Re: Connecting an HD4470 character LCD to the Raspberry PI (or an MCU) using just two wires I2C

scotty101 wrote:
Wed May 01, 2019 3:12 pm
Does this come with any software library? Or is it just the plans to connect an off the shelf GPIO expander to an LCD?
Actually in the library where you send the data in parallel, then just change that line to an I2C command.

for the Arduino the library has been written already.
by hesam_m
Wed May 01, 2019 9:44 am
Forum: Automation, sensing and robotics
Topic: Connecting an HD4470 character LCD to the Raspberry PI (or an MCU) using just two wires I2C
Replies: 12
Views: 807

Connecting an HD4470 character LCD to the Raspberry PI (or an MCU) using just two wires I2C

A typical HD4470 character LCD comes with 16 pins. If we ignore the backlight and the power pins, the 8 data and 3 control pins remain. We can address the LCD in the 8 bits or 4 bits mode. Therefore we have to consider at least 11 I/Os (8 bits) or 7 I/Os (4 bits). The circuit design could be more c...
by hesam_m
Fri Apr 26, 2019 12:40 pm
Forum: Automation, sensing and robotics
Topic: Making an infrared obstacle detection
Replies: 0
Views: 153

Making an infrared obstacle detection

An obstacle detection unit is an essential part of a variety of projects, such as robotics and security applications. The infrared sensors are widely used for these types of applications. The main drawback of some circuit designs is that the detection units are sensitive to the outside lights and re...
by hesam_m
Thu Apr 25, 2019 12:52 pm
Forum: Automation, sensing and robotics
Topic: License plate recognition?
Replies: 4
Views: 350

Re: License plate recognition?

How much is the screen refresh speed? I mean have you tested on a live video or you tested it with images?
by hesam_m
Thu Apr 25, 2019 12:50 pm
Forum: Automation, sensing and robotics
Topic: USB GPS Speed
Replies: 2
Views: 167

Re: USB GPS Speed

What is the baud rate of the GPS, is it fixed and mentioned in the datasheet?
by hesam_m
Thu Apr 25, 2019 12:41 pm
Forum: Other projects
Topic: Power supply for mobile project.
Replies: 3
Views: 315

Re: Power supply for mobile project.

There are sealed lead acid batteries which you can try also. They offer good currents, but heavier and bigger than Lithium ones
by hesam_m
Thu Apr 25, 2019 12:37 pm
Forum: Other projects
Topic: Raspberry pi as packet sniffing tool
Replies: 5
Views: 455

Re: Raspberry pi as packet sniffing tool

Maybe there are some python libraries to work with Network protocols
by hesam_m
Thu Apr 25, 2019 9:53 am
Forum: Other projects
Topic: Batteries
Replies: 4
Views: 796

Re: Batteries

Can your customer charge the battery without opening up the case and removing it? something like mobile phones
by hesam_m
Thu Apr 25, 2019 9:49 am
Forum: Teaching and learning resources
Topic: Recommendation for english learning application
Replies: 1
Views: 1323

Re: Recommendation for english learning application

You can try some mobile apps which tech lessons by funny cartoons

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