Hi!
I've been working on a project in which i need to control 2 motors. Therefore, i bought a ln298n h bridge. After i wired everything and it wasn't working, i noticed i connected the wires wrong (9V from the battery connected to H-Bridge Gnd and battery Gnd to H-Bridge 12v). Even after i fixed that, the Bridge does not seem to be working (Voltage on the motor output is always 0v). Is it possible that the H-Bridge is damaged because i switched the polarity, or am i doing something else wrong?
Thanks so much!
Yes it is very possible you have damaged it.
When you say 9V is that a small 9V battery of the sort that cannot provide enough current
to power motors? Have you tried a decent supply instead? For 2 motors you are likely to need
several amps fom the supply.
If you are lucky the weakness of small 9V batteries in providing current may have reduced/prevented
damage to the H-bridge chip, and nothing works because the battery is too weak. Or you may be
unlucky and have let the magic smoke out...
Thanks for the help!
It is actually a 12V battery, but it has only 9.something V because i havn't recharged it for a while...
How can i test if the bridge is ok then?
thanks
Wire it correctly and test it with a good power supply. If it smokes, it is dead.
A 12V lead-acid battery that reads 9V is irreparably damaged. 10.5V minimum voltage is about it,
and then only if you immediately recharge.