Posts Tagged ‘8051’

A line follower is just like a hello world in robotics. Many have been made and nowadays are based on arduino boards, this time I want to go old school and build this simple line follower from parts on my bin. The DS89C430 is a fast 8051 core variant from Maxim, before the era of arduino these are the microcontrollers that only requires UART connection and do not require a external programmer to load the bootloader because it is loaded with bootloader already from the factory and only a terminal program is required to load the hex file generated from the assembler or compiler.

This line follower consist of 3 TCRT5000 reflective IR sensors that goest to a LM339 quad comparator that gives the microcontroller a high or low signal when a black line is detected or not. A L9110S motor driver module was used to drive the two DC motors in differential drive mode. The whole project is powered by a single 3.7V 18650 battery from an old laptop battery pack. The output is fed to a boost converter based on the classic MC34063 to boost the battery voltage to 5V. The complete schematic is show below.

follower

Schematic Diagram

The whole project is built on a strip board with mixed thru hole and surface mount components depending on what I have on my bin.

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And now the code! Basically a logic based on its position on the track. One motor is stopped to make a turn. The code is compiled with SDCC.

code.PNG

Voila! a nice line follower that can navigate even a complicated track! See the video demo below

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During the college days, we were thought how to use the 8051 microcontroller, as a student our biggest problem is how to burn our hex file to our chip. Until these days, this is still the problem of students in my school so I came up with an idea making a simple programer using my Gizduino (Arduino clone in the Philippines) lying around and writing a simple C# application to process the hex file. The 89s52 is the most common available in our place and the good thing is it can be programmed via its SPI port without needing high voltage to enter programming mode.

Programming the chip is not that difficult, we just need to issue series of commands as stated in the datasheet, the c# app will parse the hex file and what the gizduino will do is just to translate it to SPI commands, then voila we have our 8051 programmed in no time. The prototype is done using my general purpose digital trainer.

The Atmega 328/168 in the arduino is overkill for these purpose, I will port this later to a smaller and cheaper microcontroller.

The fun part Testing!