Looks like a good setup for driving small motors. Though it does tie up four I/0 pins instead of two. Don't think these could do large motors as the max amperage through that chip is 500ma per pin. Guess you could use the outputs to drive some even bigger transistors if you wanted to.
The easy driver that I have can turn off all of the coils but the pin is not broken out. The new easy drivers have a pin broken out that when toggled high turns off the power to the coils. Most drivers have this feature to save power but for most uses the steppers stay powered to hold their position. In a battery application turning them off will save tons of power.
Could you please show how to use stepper motor drive with uln2003 chip and control it from atmega8?
m4unot 1 month ago
Looks like a good setup for driving small motors. Though it does tie up four I/0 pins instead of two. Don't think these could do large motors as the max amperage through that chip is 500ma per pin. Guess you could use the outputs to drive some even bigger transistors if you wanted to.
Anyway nice work!
Halo2maniaccc 7 months ago
@Halo2maniaccc Agree, but using 4 I/O pins allows you to turn-off the coils completely,
this is an advantage in battery operated devices.
Turning off the motor may be a problem if there isn't a reduction gearbox and you
need to hold the position (like in CNC machines).
Thanks for your comments.
SeuPay 7 months ago
The easy driver that I have can turn off all of the coils but the pin is not broken out. The new easy drivers have a pin broken out that when toggled high turns off the power to the coils. Most drivers have this feature to save power but for most uses the steppers stay powered to hold their position. In a battery application turning them off will save tons of power.
Halo2maniaccc 7 months ago
Can you recommend a good tutorial for this exact setup? I need to control two unipolar stepper motors with two potentiometers just like your setup.
mattv88888888 9 months ago