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1  Using Arduino / Installation & Troubleshooting / Re: Arduino uno - MCU getting hot and cant upload code.. Urgent help!! on: August 17, 2014, 10:58:28 am
Well, i cant replace any other part in the board, other than the mcu, coz i dont trust my soldering skills to tinker around..
So, i will try getting a atmega 328 with a bootloader..

Thanks for ur help!
2  Using Arduino / Installation & Troubleshooting / Re: Arduino uno - MCU getting hot and cant upload code.. Urgent help!! on: August 17, 2014, 06:28:45 am
If it is an Uno R3 as you say, you could just replace the Atmega328 with one with the Uno bootloader already installed. Disconnect any other circuits from the uno before you test it, just in case.

Paul

Paul, Do You think it will work, by replacing a new mcu, with bootloader...??
3  Using Arduino / Installation & Troubleshooting / Re: Arduino uno - MCU getting hot and cant upload code.. Urgent help!! on: August 17, 2014, 04:36:33 am
Maybe if you have some soldering skills and test equipment..
Have you done the tests suggested in the sticky post at the start of this section? In particular the loop back test?

Well, i have not tried those tests yet. but i just performed the loop back test as instructed.. Shorted GND an RESET and TX-RX
And i opened the serial monitor. I typed few words and pressed enter, it got displayed again..
i have posted a pic for ur reference.
4  Using Arduino / Installation & Troubleshooting / Re: Arduino uno - MCU getting hot and cant upload code.. Urgent help!! on: August 17, 2014, 12:51:54 am
But.. cant i change just the mcu alone.. or do something else than replacing the whole board..???
5  Using Arduino / Installation & Troubleshooting / Arduino uno - MCU getting hot and cant upload code.. Urgent help!! on: August 17, 2014, 12:36:36 am
Hey guys,

I am using an Arduino Uno REV 3, board... I have been having this for the past two years.. and now i am facing this problem..
When i connect my board to my pc, it gets recognized, but when i try to upload the blink code, i am receiving this error:
avrdude: stk500_getsync(): not in sync: resp=0x00

i have tried this on both my windows & desktop and win 8 laptop. I get the same error..
Also, The mcu(Atmega 328p) becomes hot(not warm) after 10 minutes, though i dont feel anything on the voltage regulator..

Please help me sort out...
Thanks in advance smiley
6  Using Arduino / Motors, Mechanics, and Power / Re: wierd arduino and l293d motor shield problems on: July 25, 2013, 07:38:16 am
I have solved the problem of this unusal behavior of motors, which has been present right from my start of this obstacle detecting/line following bot project...
Being a noob, i have been using a 9V battery to power the L293D, which has been the biggest mistake right from the beginning. I never knew the that 9V battery could not supply the required current to drive the motors, and i thought it was the chip i had destroyed and had bought three more!!!(LOL smiley-grin)

Now that I came into my senses, I switched to AA batteries and every problem got solved..

Thanks for all for replying to my problems..   smiley-mr-green
7  Using Arduino / Motors, Mechanics, and Power / Re: wierd arduino and l293d motor shield problems on: July 18, 2013, 02:01:16 pm
Quote
Perhaps a better idea is to disconnect the motor if the motor supply is absent, then no high currents can flow.

Sounds like a nice bet..

Quote
[If you leave an input unconnected all bets are off - again don't do this, floating inputs can read as low or high, or oscillate

But if I connect both the inputs for the motor, it does not run, be it 5,6 or 9,10!!

Also can you make a guess what could be wrong with this shield??

8  Using Arduino / Motors, Mechanics, and Power / wierd arduino and l293d motor shield problems[SOLVED] on: July 17, 2013, 09:58:37 am
Hi guys,
 I just bought a local arduino l293d motor driver shield in india.. About 11 USD.. I bought this due to my initial breadboard circuit failures and lack of enough soldering skills to make an motor driver circuit myself smiley-sad

Now, I have been experinmenting with this past 3 days and I observe the following wierd behaviors..

1) the 8th pin1(VCC) through which we provide required voltage to the motors in connected to the VIN pin of the arduino.. But whenever I power the arduino via an apple 5V adapter through USB... Even without the the vin pin connected to an external battery, the motor runs!! Can it happen???

2) Each motor requires a two inputs HIGH or LOW based on which it send output to the motor.. In my case I have assigned 5,6 digital pins of arduino as HIGH and LOW while 9,10 as LOW,HIGH... But when I connect one of the input pin(note it is only one pin) connected to say pin 5, the motor starts running backward!! And it repeats when I connect ONLY ONE PIN to pin 10 again...

The motor moves backwards when connecting the another input pin alone to 5 or 10, it moves forward!!!

I can't deduce the problem to single component, my shield, arduino, motors or connections??
 So can anyone pls shed some light ?? And sorry for the lengthy problem by the way.. smiley-sad

Also you can visit this site in order to have a look at my shield:
http://allsensor.in/ProductDetails.aspx?SEOType=BSuwhmB9Ll4%3d&PID=3jII%2fQHIflo%3d&CType=ZgDIC937E8s%3d&CID=Ex1tZ6fBQBg%3d
9  Using Arduino / Motors, Mechanics, and Power / Re: wierd running of motors using arduino and l293d on: June 10, 2013, 02:52:58 am
Thanks for the help, cr0sh, but i do take care of the pin numbering and always refer to a datasheet/ pinout diagram and work on the circuit. But sill i might have gone wrong wile building that, so lemme rebuild the circuit and try again....
10  Using Arduino / Motors, Mechanics, and Power / Re: wierd running of motors using arduino and l293d on: June 09, 2013, 05:09:59 am
err... dc42, just give me a two days time, coz the whole cirucuit stopped working suddenly.. so i have to figure out what's going on now... i suspect the ic itself.... lemme se

thanks
11  Using Arduino / Motors, Mechanics, and Power / Re: wierd running of motors using arduino and l293d on: June 07, 2013, 12:52:47 pm
Also my multimeter  beeps when i check for continuity between the motor terminals of both the motors. Is it a good sign??
12  Using Arduino / Motors, Mechanics, and Power / Re: wierd running of motors using arduino and l293d on: June 07, 2013, 12:15:55 pm
6 and 7 goes to the input pins 1 and 2 while, 10 and 11 go to the input pins 3 and 4(on the other side of the ic...)
13  Using Arduino / Motors, Mechanics, and Power / Re: wierd running of motors using arduino and l293d on: June 07, 2013, 05:59:54 am
ya Mark, i am using those PP3 batteries.
And dc42, the pins 6,7,10 and 11 are the pins on arduino connected to the input pins on the motor driver.
14  Using Arduino / Motors, Mechanics, and Power / Re: wierd running of motors using arduino and l293d on: June 05, 2013, 05:17:51 am
Mark, I don't know what you mean by those PP3 motors.... But all I know is that it's a basic DC geared motors, and they look exactly like this:

http://www.extreme-robots.nl/91-thickbox/dc-geared-motor-met-wiel-.jpg

And I will try controlling each of the motors independently using the motor driver and get back to you.

Thanks once again. smiley
15  Using Arduino / Motors, Mechanics, and Power / Re: wierd running of motors using arduino and l293d on: June 04, 2013, 01:04:03 am
Currently, I am supplying power to the arduno using my desktop's USB port. And I am using the 5v supply form the arduino to the motor driver circuit and grounded using arduino's gnd pin. For the raw voltage of the motors, I am using two 9v batteries in series, which gives it around 13v.. To the motors.

The wiring is exactly as described in the instrucatbles page:
http://www.instructables.com/id/Control-your-motors-with-L293D-and-Arduino/step2/Advanced-implementation/

Thank you MarkT for taking your time to reply... Feel free to ask any other extra details you need.



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