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How-To’s

Testing RF Transmitter and Receiver Circuit

testing

After publishing the article Make a simple RC car I have received a lot of comments and e-mails from readers who have faced some difficulties while trying to make the circuit by themselves. I have complied a small list of testing methods for various components that will help your narrow down the caused of the malfunction. Like always, we will have to split the entire circuit into various segments in order to test them. So there are four major places where problems …

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DIY: Don’t Buy Breadboard Power Supply Make it!

breadboard power supply cover photo

Most of the time your on a breadboard will just need a 5 volt supply to power all the components. Very rarely you might need a 12 volt (if you are driving loads like motors) or 3.3 volt (devices rated at 3v3). In this post we will see the making of a breadboard power supply, mostly from component that you will find off the shelf. Now there are various methods for doing this. Build a 5 volt regulator on the breadboard …

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How to Make PCBs at Home With Toner Transfer Method

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Toner Transfer method for making PCB at home is probably one thing that went as viral as the Arduino. Electronics hobbyists around the world started using it to make professional looking PCBs at home. Here I will document the steps involved in fabricating PCBs with things that you can mostly find off the shelf. Before getting to the details in the making your own PCBs I wish to share an old experience. So, if you have left the soldering iron …

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How to Make a Tray to suspend PCBs into the Etchant

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In this post I will document the procedure involved in making a tray to suspend PCBs. The etchant (FeCl3 solution) is toxic and cannot be handled with bare hands. So I devised this easy and reusable method for suspending the PCBs with the toner into the solution. If you are planning to make PCBs once in a while, then this method could prove to be really useful and time saving. But if you are a one timer then this a tiresome venture …

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Make a Digital Clock with DS1307 and PIC 18F4520

digital clock lcd

Digital clocks are are very commonly (cheaply) available these days. Some of them have a built in RTC to keep the time running even if the main battery fails and some of them don’t. In either case, for an offline embedded application to get a time stamp, an RTC in almost the only cheap solution solution available. Most of these clocks use a 7-Segment display to display the time and date while some use LCD displays. In this post we will see how to …

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Hack a Toy Car to Make a Cheap Wireless Robot

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Hack a toy car to make a cheap wireless robot? Yes, cheap toy remote cars form china can be scavenged to get their remotes to work with our robots. All of us have seen and played with toy cars some time in the past. Some -like me- might have bought them to get the magnets inside those DC motors. I don’t know why those C shaped magnets caught my attention more than the car. I have to admit even after growing …

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Workaround for “SD Card Initialization Failed!” in Arduino

Arduino sd card

I was working on a project that involved the use of a SD (Secure Digital) card to log data into a text file. I chose Arduino as it  had a vary stable FAT (File Allocation Table) library. I had an Arduino Mega at my disposal and built a resistive network to step down the logic levels of the Arduino SPI bus at 5v to the SD card’s at 3v3. I was getting voltage levels that were withing the absolute maximum …

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How-to: Make a Chassis For Your Robot

robots chassis

Readymade chassis that are available in the market (like the one above) are really good, cheap and for all you know they might have been subjected to a R&D before fabrication. In spite of all these advantages I still see the following issues with readymade chassis. They are not available the shape and size that I feel fit for my robot. Most of the time I am forced to restrict the robot size to the size of the chassis that is …

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Line Follower Robot – Build it from scratch

Line Follower

Line Follower Robots are the most common type of robots that are built by hobbyist and student interested in robotics and embedded systems. The reason for the popularity of the Line Follower robot is the fact that is simple to build and easy to understand the logic behind it. This post will give you working level knowledge on building and programming line follower robots from scratch. A robot is a combination of hardware and software. One has to give equal …

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Make a Simple RC (Remote Controlled) Robot Car

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Whether you are an engineering student building a multi terrain vehicle or an electronics hobbyist trying to impress people with your skills, making a RC robot car (wireless)  is much better than the wired robot which you will have to tail while driving. This is not exactly a robotics project. By definition, a robot is something that makes a decision based on some external parameters. There is one hell lot to do before going around telling people ‘I build robots’ but …

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