Arduino UNO/Duemilanove 2dof firmware

Ok. I suggest you apply power to the PCB from the Arduino ... Not from ATX. Two wire (GND and +5V). Next connect Arduino to USB and repeat all 5 test (without H-Bridge)

here it goes
1) dir to gnd

bc547 4,76
in2 1,35
in1 0,15
2)dir to vcc
bc547 0,3
in2 0,15
in1 1v
3)
dir and pwm on vcc
in2 0,15 in1 4,20
in1 0,15 in2 4,20

in the picture u can see how i made the first test,, (dir to gnd) see if its correct

and thank you for your patience loll we will get there

Bad news. Transistor is OK, but 7408 is broken, IMHO. This could occur when it's powered without ground wire connection.
Try to check output pins on opposite side (pins 8 and 11 of 7408). And check is the power good connect to pins 7 and 14

see pins 8 and 11 they both are giving 4,20v

Ok, Try to connect pins 9 or 10 to GND. Pin 8 should drive to 0V. After 12 or 13 to GND (pin 11 should drive to 0v). If it correct, you can try to use this "half" of 7408...

• i have 2 pcb with boths gnd and 5+ connected to each other.. and they both 7408 is given the same voltage

if one brake the other brake too.... do you think it gone? loll if so i buy others to test what voltage should the give?

so i can't never never power the pcb only with 5+ is it? always need to put gnd first..? its more easy to replace them
,, so u can confirm they have gone?

.... do you think that i can use ard to power 2 pcb? or the are week?
i have made a lot of tests without gnds only with the 5+ ,,,,,,

mmm. 74ls08 works very simply. It has AND logic - OUTPUT PIN (3) drive to +5 v if both INPUT (1 and 2) pins sets to +5V
In this case if PWM pin (it connects to pins 2 and 4 of 7408) connect to 0v all outputs pins (IN1 and IN2) should be = 0v...

Arduino takes power from USB port of PC and you can powered two pcb from this +5v supply

3 pages for us to discover that the CI is gonna loll
i will study how this pcb works and tomorrow i will buy other CI

and with this picture in your profile seems that now I'm talking with a person loll

and just for curiosity if pins 1 and 2 sets +5 than IN2 is powered OK
so basically how pins 3 and 4 works? to power the pin 6 (in1)?
whats the logic to in1 works?

this is just to add to my knowledge

74ls08 has 4 identical logic gate "2 and"... all works identically.
http://en.wikipedia.org/wiki/Logic_gate

ive changed the IC but keeps the same when i connect DIR to gnd in2 is gevin me 4v im testing on protoboard

??? Check voltage on all inputs pins of 7408. (1,2,4,5) All except one should be = 0v

pins 1 4,80
2 1,10
pins
4 1,10
5 0v
made with dir connected to gnd

i dont know whats happening

Wow... pins 2 and 4 has 1,1V ? You should decrease resistor from this pins to GND.
Now it 10k ? Replace it with smaller resistor (about 1..3 kOhm) . And then check voltage on 2 and 4 pins

i replaced with 1k resistor and it gives

pin1 4,80 pin2 0,19
pin4 0,19 pin5 0v

what do you think

looks better. And what now on IN1 and IN2 pins? If both pins has near 0 V - make all 5 test one more time...

owooo now we are in the right way
dir to gnd
b547 4,78
IN1 and IN2 0,15

dir to vcc
bc547 0,3
IN1 an IN2 0,15

PWM TO VCC
dir Input on vcc
IN1 4,36
in2 0,15
dir to gnd
IN1 0,15
IN2 4,36

if you think its better put smaller resistor i change....

I think resistor 1K is good. Now you can connect DIR and PWM (and, of course, +5V and GND) to arduino and try to check values on IN1 and IN2 pins when you change signals from xSimCtrl... When PWM value in xSimCtrl goes to "positive" values - one of pins (IN2 or IN2) should increase voltage (and opposite pin should be = 0). And when PWM values goes to "negative" values - other pin should increase voltage...