I've been working on a robot project, and I'd like to build a custom PCB which combines a avr microcontroller, power supply, h-bridge and sensor circuits. My attempt is partially to learn about making my own PCB, but also I'd like to make a nice clean robot without a bunch of wires hanging off it.
So far nothing has been too overwhelming, but I came across quite a few h-bridge chips in my research and I wondered if there was some guidance from the group on some of the options.
My needs are pretty basic. Two 0.15 amp 3v motors, I'd like to operate fwd/reverse with PWM speed control.
A few chips I've looked at:
L293D
754410
L298
LMD18200
Does anybody have experience with these chips and how did it work for you?
I have a couple of 298s in my stock, but I don't have fast recovery diodes. But, overall it seems a bit overkill for my needs.
Be aware that these types of chips may have a voltage drop across them that might be significant in the 3v range. 4.5v might be needed to get full performance from the 3v motors.
zoomkat:
Be aware that these types of chips may have a voltage drop across them that might be significant in the 3v range. 4.5v might be needed to get full performance from the 3v motors.
I was planning on a 9V power supply (AA batteries) for the entire board, so I'm thinking I should be ok?
Yes, 6 pins total from the arduino. 1A ,2A, 1-2Enable, 3A, 4A, 3-4Enable.
Transistor and 2 resistors about as simple as it gets for an inverter. I used that to invert a TTL level serial stream so the 328 UART would read it correctly.
You could try this sn74lvc2gu04 from TI if you don't mind surface mount