Motor Shield Choice
#1
Posted 20 August 2011 - 02:08 AM
#2
Posted 21 August 2011 - 04:39 AM
#3
Posted 21 August 2011 - 07:15 AM
Yep, works great! I got it and wrote some code for it as well:Ok after a few investigation on the forum and website , i think this one should work without any "tricks" : http://www.dfrobot.c...9&product_id=59
https://stefan.co/ne...rshield-driver/
My .NETMF projects: .NETMF Toolbox / Gadgeteer Light / Some PCB designs
#4
Posted 11 September 2011 - 02:37 AM
#5
Posted 14 November 2011 - 01:23 PM
#6
Posted 12 January 2012 - 02:04 AM
#7
Posted 12 January 2012 - 05:53 PM
I'm trying to do something similar to the OP, I'm trying to drive 3 stepper motors (~3A each). And most of these netduino/arduino shields say they can drive 1-2A. Ardumoto (http://www.sparkfun.com/products/9815) can drive 2 motors of 2A each, does that mean I could somehow join the channels and run one 3A? I? know if this works, I would need 3 such shields, but at least the circuits will be pluggable, as opposed to buying a separate driver circuit, which would need ugly connections
Also does anyone have experience with driving bipolar (4-wires) motors with any of these shields?
TIA
Hi seeker,
I have used the Ardumoto shield to drive normal motors.
The biggest issues I had were the PWM pins being in the wrong place and getting the voltage supply to the shield high enough and separate from the Netduino supply.
Couple of questions:
- When you say the stepper motors have four wires, do you mean they have two coils, each coil having a pair of wires, or are there four coils with a common ground (fifth wire)?
- When you say the stepper motors are 3Amp, is that 3Amps per coil, or 3Amps total (1.5Amps per coil)?
then that matches the bipolar stepper motor example in Figure 10 page 7 of the L293B datasheet.
Each coil is like a normal motor.
In this case each "PWM" input to the Ardumoto could be driven by a normal output line (output does not have to be PWM) to energise a coil, and each direction line (another normal output) would determine which polarity the coil is. Using one Ardumoto would allow a single two coil stepper motor to be driven.
It would be OK for each channel of the Ardumoto could be used to drive one coil of the stepper motor.
The data sheet does show combining the outputs of the L293 to give higher currents. So you could do this if you needed to, but that would mean one Ardumoto shield per coil. Also if you make a mistake wiring it up - there will be smoke!.
Think about how you are going to route the outputs from the Netduino to the shields, the Ardumoto has no way to remap the pins when stacked.
Paul
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