connect two pics

[soki]

Ok I changed the battery pack and already work well!

For inline resistors 500 ohm will be ok?

[soki]

Ok guys it finally works! I replace 9V battery with 6xAA battery pack all circuit use that power source, I put 500 ohm inline resistors between PIC and L293D and a 0.1uF decoupling capacitor across Vdd and Vss.

Thank you all for your great help!

[skimask]

Ok I changed the battery pack and already work well!

Now you know all about internal impedance of a battery....

For inline resistors 500 ohm will be ok?

For situations like this, start high and work down, until something either works reliably and/or blows up.

[soki]

Now you know all about internal impedance of a battery....


For situations like this, start high and work down, until something either works reliably and/or blows up.

Thanks God it works fine from the start and nothing blowed up!