Let's Make Robots!


U7 got fried for some reason :(

I just got my Dagu 4 Channel Motor Controller, already a small part gave some smoke and one motor channel is not working anymore.

All four wheels were turning at the same time before the channel4 got fried.


  VCC to Arduino 5V

4 PWM on the motor controller to 4 PWMs on the Arduino uno.

SRF02 and 16f877a in I2C mode ranging


I am trying to test SRF02 ultrasonic rangers I just bought and to do that I connected them as required, and wrote a program in MIKROC for I2C transmission. My problem is that everytime I power up the curcuit my PIC burns. I connected pull up resistors to each of SDA and SCL lines; could it be that these resistors impose too much current into SCL and SDA pins of the PIC? Maybe I have to use a buffer between bus and 5V? The code is below. I am new to embedded programming so any of your comments would be of much use to me.

Thank you,


The Code: