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I began work on my first robot about two years ago. For no particular reason, I decided to begin with a line following robot and truth be told, my first attempt at building it was a complete failure. Looking back at my efforts, I believe, for a beginner, I was rather too ambitious. The circuit that I had designed had a bunch of unnecessary stuff which I then believed would give my robot an edge over the others. But it never worked and I had to start all over from scratch.

In my second attempt, I managed to get the robot on track. As delighted as I was with my first robot, it was nowhere near where I wanted it to be. I took it to a couple of competitions and not much to my surprise, it failed in both of them. I knew it was time to make some major changes in the design. In my third attempt, (actually, it wasn’t the third, it was a revision of my second attempt) I updated the firmware and came up with a much more stable and accurate version. It performed well when tested and much to my delight, it finished first in two competitions and second in another. Though I was proud with what I had achieved, I felt that the robot was visually rather unappealing.

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And you’ll come to know why from its picture given above. It had wires running all over it and I had no other option but to rebuild it. A month or so later, I had the robot all ready and that is the current version of my first robot. In this instructable I will guide you through the steps that I've followed in building the current version of my robot. It’s one of those robots which belong to the “scratch-built” category.

You might find it difficult to find all the parts that I have used. So I insist you to read through the steps that I have followed, and then implement it in your own way with the parts that you've found. This instructable requires that you are familiar with the following: • Soldering and related equipments • Hand tools like screwdrivers, wire cutters and strippers • Reading schematics and connection diagrams • C/C++ programming for AVR microcontrollers (optional) Step 1: Gather the Parts.

Given below is a list of components that I have used in building this robot. The number of sensors to be used actually depends on the complexity of the course which the robot is supposed to cover.

If the course contains sharp 90 degree turns, intersections and acute angle turns, you will have to go with at least 4 sensors. Canon Ir1023n Driver Windows 8. The robot presented here has a total of nine sensors - eight of them arranged in a line and the other in front of the line at the center. Choosing the number 8 has the advantage that you can represent the status of all eight sensors using a single byte with each bit representing the state of one sensor. Brooks Buford Suspicious Package In Los Angeles. This will be discussed in detail in later steps.

Step 3: Batteries.Which One to Choose? Batteries come in different varieties and choosing the right one for your application can be a daunting task. Autonomous mobile robots require batteries that last long and are light in weight. Lithium-ion batteries are a good choice. But they are quite costly and require a dedicated charger. The one shown in the picture is what I have used. It is a Lithium-ion battery pack rated at 11.1V 3000mAh 2C.

It has separate cables for charging and discharging. I suggest you read this excellent article on batteries written by ladyada.

You can find it. Step 4: The Voltage Regulator. The robot need a constant 5V supply for the microcontroller, the sensor array and the LCD. In the first version of my robot, the 7805 linear regulator handled this job. After a couple of trial runs, I noticed that the regulator was getting heated up even with a heatsink attached to it. So in the later version, I decided to use a switching regulator and now it works fine. SELECTING THE COMPONENTS From the datasheet of LM2576 switching regulator (Page 12, Figure 4), you will find the value of the inductor that is to be used.

It depends on the maximum input voltage and maximum output current. In my instance, the maximum input voltage is about 12V and maximum output current does not exceed 200mA.

So I must have chosen a 680uH inductor. But unfortunately I couldn’t find one.