when i turn on the 7 volt power supply led 9 and 10 are always on
whats the reason ?

 

hi Dabu,
The drive transistors for D9/10 are PNP, so if the Arduino pins D8 and D9 are Low 0v, the transistors are On..
E

 

hi Dabu,
The drive transistors for D9/10 are PNP, so if the Arduino pins D8 and D9 are Low 0v, the transistors are On..
E

they are not low they are turning off and on every 5 volts :/

 

shouldnt it turn off when pin 9 and 10 goes high ?

 

hi,
Thats not what you said., you did say you were pulsing them Hi/Low
when i turn on the 7 volt power supply led 9 and 10 are always on

EDIT:
If pins D8 and D9 a switched to +5V and the PNP Emitters are at 5V the transistors should be Off.

 

hi,
Thats not what you said., you did say you were pulsing them Hi/Low
when i turn on the 7 volt power supply led 9 and 10 are always on

so what could be the problem of not turning off even when arduino pin goes high ?

 

hi,
Thats not what you said., you did say you were pulsing them Hi/Low
when i turn on the 7 volt power supply led 9 and 10 are always on

EDIT:
If pins D8 and D9 a switched to +5V and the PNP Emitters are at 5V the transistors should be Off.

sory i forget the emiiter was not at 5 volt
my mistake

 

i connected emitter directly to vcc which was 7 volts :3

 

Measure the pins D8 and D9 actually are at +5V, if for example the Arduino output was say only 4V the transistors would still be ON.

EDIT:
If the Emitters are at 7V a 5V Base signal will not switch them Off...

 

Measure the pins D8 and D9 actually are at +5V, if for example the Arduino output was say only 4V the transistors would still be ON.

EDIT:
If the Emitters are at 7V a 5V Base signal will not switch them Off...

bro that is working awesome
you are best (y) have a nice day