H-bridge braking with L293(D)
April 25, 2010
I discovered how much braking power a Solarbotics GM9 can have when you short the terminals. I need that stopping power to make a robot that is suspended from a wire, wound around a spool, powered by a GM9.
But I also need to be able to power the motor in either direction. My platform of choice is the Picaxe 28 project board with a L293D motor driver chip.
How do I tell the L293 to short the terminals of the motor? I tried
high 4 high 5 ' both inputs high
low 4 low 5 ' both inputs low
but my motor will not brake.
Must I use the enable/disable pin on the L293D as well? Or should I get rid of this chip and get one without the internal flyback diodes (L293 without D)? Is a relay in order to tie the terminals together outside the main circuit?