de amst wiskar: robot line folower

  
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One of my student has made a disgraceful robot that used two stepper motors and with a simple IR sensor. Yes, above picture is what I`m talking. Without battery carrying, a little bit torque of the stepper and misalignment of driving shaft, makes it crawling not walking, but first demo, showed quite impressive to me. He said he wrote a couple of p
de amst wiskar: robot line folower - schematic

rogram lines using C, his robot can track the black tape. I feel delighted his intention and endeavor. I thought, " he borrowed me DS5000, expensive one, a soft uController with internal bootloader, why shouldn`t try with our learning board C-52 Evaluation Board instead". Another one, told me the same day "I found the L293 Push/Pull Four Channel Driver at Ban-Moah, it costs 1. 5 US$ ". I`ve been searching this chip for a year. The MiniBoard, a Motorola 68HC11 Robot Controller board designed by Fred G. Martin, also uses this driver. The day after, I then decided to prepare the page describing how to use C-52 EVB as a robot controller board. I asked my student for competition, build yourselves robot that can track the black tape. Prize for the winner is 100 US$, with a bit condition that the winner must pay for a big party at Soi Jinda`s Somtum (Papaya Salad) shop. And one of the competitor is me. I thought the rule should be conceived roughly by students and technically by me. The picture on that day will put here soon. Basic circuit of using L293 forms an H-Bridge Driver is shown in Figure 1. As shown for such inductive load as DC motor, external diodes for suppressing back EMF must be connected. The MiniBoard uses L293D instead, the L293D has internal diodes, however providing a bit less driving capacity, i. e. , 600mA @4. 5V-36V. From the truth table, we see that direction of the motor can control by pin C and D. VINH...



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