line follower whit atmega8 - Electronic Circuits Projects Diagrams Free

Igor Moreira · 12th September 2006, 01:56 PM

Hi. I'm new here. I'm building a line follower robot, I'd like to know if someone have a poject of line follower whit atmega8, I think it is nice to build a robot like this.

Thanks.

bloody-orc · 19th September 2006, 01:42 PM

search man! search

bloody-orc · 19th September 2006, 07:54 PM

it's not just easy but also doable in a week. as you have someone who can possibly do the mechanical parts then first thing to do is make a rolling cassy. connect 2 motors to a base plate. use DC motors or Servos. if using DC it's easier to control with AVR but it makes a lot of noise so you must take some steps to make it smaller (add caps etc, search the Internet for ways to do it). if you have chosen the motors, gear reductions and wheels. connect them to your base plate. i think 10cmx10cm will do for a smaller line follower...

Then if you have this working start making a schematic. get yourself a microcontoller (like ATTiny2313, which has an analog comparator) or something bigger that also has ADC pins. chose transistors to drive your DC motors or connect the servo and find example codes on how to drive a servo. if you go to the DC way you must find a big enough transistor to support the voltage and amps of your motor and connect the transistor to the microcontroller. i suggest connecting it via opto isolator to further reduce the noise. then start controlling the bot use PWM if the chip has one so that you can change the speed of the motor. make your bot go round and round.

If your bot moves nice then start with the sensor part. make 2 sensors using red super bright LED's and LDR's connect them on an angle and shield them from other light sources with tape, cloth or wood(drill holes into wood blocks and insert the sensor and led in it like i did). connect those sensor modules in front of your bot. Actually the best place is about 3cm from the point where the turning wheels are, but in front will do also. start experimenting with them reading the ADC values or using an Analog comparator to see witch one is lighter or dimmer (to compare the LDR values without the need of ADC).

if you are certain your sensors work well then you can start making the final program for the bot. make a block diagram of what your bot must do (flowcharts) and then using them start making the program. how to make that is another weeks topic and if you cant think of it ask me if you have done all the other steps above...

I hope it helped you get on the right track. if you don't understand anything feel free to ask me.

Rain

Boris · 26th September 2006, 11:27 PM

Why do you use AVR ?
Try visit www.parallax .com Very usefull on PIC controller and you can find schematic for this project.

bloody-orc · 27th September 2006, 03:49 PM

cause AVR is a proffecional tool not some LEGO like tool like parallax makes. nad you can get an AVR for 1$ but parallax chips costs starts from $10

tmedap · 7th October 2006, 06:59 PM

http://elm-chan.org/works/ltc/report.html
http://members.shaw.ca/climber/solarline.html
http://www.fastcharged.org/robotics/firstrobot

Jevon · 25th October 2006, 03:21 PM

made a line follower few months ago.... travelled bout 40cm a second on a straight. Used dc motors to drive the guy. What do you want to know bout it... or do you just want me to send you the documentation done on it. Also has an infared device to stop it from hitting objects

Jevon · 25th October 2006, 03:23 PM

used a atmega32 for it...

philba · 25th October 2006, 04:48 PM

I agree that AVR is a decent choice but so are PICs, MSP430s, Z8s, ... Basically just about any uC will work because line following, in it's basic form, is pretty simple.

You need motor control (2 HBridges) and a set of line sensors (2 to 5 or more). You need a small number of I/O pins - 4 for motor control and one for each line sensor. It doesn't need much memory or speed. The program can be built as state machine. You can get much more sophisticated to get better speed but I'd start simple.

And, you really need to google for "line following rogot"

bloody-orc · 26th October 2006, 01:13 PM

jevon maybe an image of the bot for us to see? or the vidoe of the bot rushig 40cm a sec..

philba · 26th October 2006, 03:43 PM

lol. 24 KPH, I missed that.

giaosucan · 30th October 2006, 09:04 AM

Quote:

Originally Posted by Igor Moreira

Hi. I'm new here. I'm building a line follower robot, I'd like to know if someone have a poject of line follower whit atmega8, I think it is nice to build a robot like this.
Thanks.

I've just finished building a line follower robot ,I use six sensors which are arranged horizontally. You should use PIC or 89 rather than atmega8 ,it works more perfectly.
howere ,you must care about noise of sensor. It is very important for building a line follower robot .To eliminate the noise of sensor ,you can use software or hardware to solve this trouble
good luck

Jevon · 30th October 2006, 10:43 AM

alright, will put a up a pic of it when i can find my camera. a nice idea for the line follower is to put 2 sensors on the sides at the back of it. these can be used to check for acute angle turns. its a little hard to spot those if all your sensors are in a line at the front... but thats just if u want to get fancy

Jevon · 30th October 2006, 10:59 AM

David Cook - Something About Robotics... a book with some good insight into making line followers for any help

Igor Moreira · 30th October 2006, 12:02 PM

I'm try to replicate this project.
http://elm-chan.org/works/ltc/report.html
But I have some problems, I dont' have the atmega8 16AC, I have atmega8 16PI, I don't use PIC becouse I don't have the programator for PIC, only the Atmel programator, If you have some project or some program with atmega8 16PI - 6 sensors, It will help me.. Thanks for your helps.

12th September 2006, 01:56 PM	(permalink)
Igor Moreira New Member	line follower whit atmega8 Hi. I'm new here. I'm building a line follower robot, I'd like to know if someone have a poject of line follower whit atmega8, I think it is nice to build a robot like this. Thanks.

19th September 2006, 01:42 PM	(permalink)
bloody-orc Experienced Member	search man! search __________________ Need Help? Press F1 If that doesn\'t help you, ask me... I might know better.

19th September 2006, 07:54 PM	(permalink)
bloody-orc Experienced Member	it's not just easy but also doable in a week. as you have someone who can possibly do the mechanical parts then first thing to do is make a rolling cassy. connect 2 motors to a base plate. use DC motors or Servos. if using DC it's easier to control with AVR but it makes a lot of noise so you must take some steps to make it smaller (add caps etc, search the Internet for ways to do it). if you have chosen the motors, gear reductions and wheels. connect them to your base plate. i think 10cmx10cm will do for a smaller line follower... Then if you have this working start making a schematic. get yourself a microcontoller (like ATTiny2313, which has an analog comparator) or something bigger that also has ADC pins. chose transistors to drive your DC motors or connect the servo and find example codes on how to drive a servo. if you go to the DC way you must find a big enough transistor to support the voltage and amps of your motor and connect the transistor to the microcontroller. i suggest connecting it via opto isolator to further reduce the noise. then start controlling the bot use PWM if the chip has one so that you can change the speed of the motor. make your bot go round and round. If your bot moves nice then start with the sensor part. make 2 sensors using red super bright LED's and LDR's connect them on an angle and shield them from other light sources with tape, cloth or wood(drill holes into wood blocks and insert the sensor and led in it like i did). connect those sensor modules in front of your bot. Actually the best place is about 3cm from the point where the turning wheels are, but in front will do also. start experimenting with them reading the ADC values or using an Analog comparator to see witch one is lighter or dimmer (to compare the LDR values without the need of ADC). if you are certain your sensors work well then you can start making the final program for the bot. make a block diagram of what your bot must do (flowcharts) and then using them start making the program. how to make that is another weeks topic and if you cant think of it ask me if you have done all the other steps above... I hope it helped you get on the right track. if you don't understand anything feel free to ask me. Rain __________________ Need Help? Press F1 If that doesn\'t help you, ask me... I might know better.

26th September 2006, 11:27 PM	(permalink)
Boris New Member	Line follower Why do you use AVR ? Try visit www.parallax .com Very usefull on PIC controller and you can find schematic for this project.

27th September 2006, 03:49 PM	(permalink)
bloody-orc Experienced Member	cause AVR is a proffecional tool not some LEGO like tool like parallax makes. nad you can get an AVR for 1$ but parallax chips costs starts from $10 __________________ Need Help? Press F1 If that doesn\'t help you, ask me... I might know better.

7th October 2006, 06:59 PM	(permalink)
tmedap New Member	How to You do? http://elm-chan.org/works/ltc/report.html http://members.shaw.ca/climber/solarline.html http://www.fastcharged.org/robotics/firstrobot

25th October 2006, 03:21 PM	(permalink)
Jevon New Member	your help made a line follower few months ago.... travelled bout 40cm a second on a straight. Used dc motors to drive the guy. What do you want to know bout it... or do you just want me to send you the documentation done on it. Also has an infared device to stop it from hitting objects

25th October 2006, 03:23 PM	(permalink)
Jevon New Member	oh ya used a atmega32 for it...

25th October 2006, 04:48 PM	(permalink)
philba Experienced Member	I agree that AVR is a decent choice but so are PICs, MSP430s, Z8s, ... Basically just about any uC will work because line following, in it's basic form, is pretty simple. You need motor control (2 HBridges) and a set of line sensors (2 to 5 or more). You need a small number of I/O pins - 4 for motor control and one for each line sensor. It doesn't need much memory or speed. The program can be built as state machine. You can get much more sophisticated to get better speed but I'd start simple. And, you really need to google for "line following rogot"

26th October 2006, 01:13 PM	(permalink)
bloody-orc Experienced Member	jevon maybe an image of the bot for us to see? or the vidoe of the bot rushig 40cm a sec.. __________________ Need Help? Press F1 If that doesn\'t help you, ask me... I might know better.

26th October 2006, 03:43 PM	(permalink)
philba Experienced Member	lol. 24 KPH, I missed that.

30th October 2006, 10:43 AM	(permalink)
Jevon New Member	alright, will put a up a pic of it when i can find my camera. a nice idea for the line follower is to put 2 sensors on the sides at the back of it. these can be used to check for acute angle turns. its a little hard to spot those if all your sensors are in a line at the front... but thats just if u want to get fancy

30th October 2006, 10:59 AM	(permalink)
Jevon New Member	David Cook - Something About Robotics... a book with some good insight into making line followers for any help

30th October 2006, 12:02 PM	(permalink)
Igor Moreira New Member	I'm try to replicate this project. http://elm-chan.org/works/ltc/report.html But I have some problems, I dont' have the atmega8 16AC, I have atmega8 16PI, I don't use PIC becouse I don't have the programator for PIC, only the Atmel programator, If you have some project or some program with atmega8 16PI - 6 sensors, It will help me.. Thanks for your helps.

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