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1  Using Arduino / Motors, Mechanics, and Power / Re: My driver Anaheim motor does not rotate on both sides on: August 16, 2014, 07:16:21 pm
Have you hooked up (no mention of it in your first post) the gnd (pin 7 of motor/driver) to the gnd of the arduino?
2  Using Arduino / Project Guidance / Re: Robot arm project guidance wanted (transistors) on: August 08, 2014, 08:36:12 pm
OK so I will try and sort this out just a little bit.

Did some digging and as Mark suggests it is a split power supply.

There is also a usb board to control it.

There are P605's on the board and a little digging came up with the datasheet.

So yes it can be done with just 2 .

3  Using Arduino / Project Guidance / Re: Beginner looking for guidance on Motorized Abacus, possible? on: August 07, 2014, 03:32:29 pm
I'm guessing you want the rods that hold the beads to be vertical so as to maybe have a digit display to show the value right above it. If not why not horizontal? Save you some hair.

How fast? All move at the same time or an animation of one at a time showing how it works. As each bead moves the digit display shows the value as each bead is moved? Say that 3 beads need to be moved are they all moved at once?

Maybe use a stepper motor for each rod to move an R/C servo along  a track behind it and when to move a bead the servo moves it's arm to grab the bead. Stepper moves it to the position and servo releases it.

Maybe just use a type of indentation for each position so the bead kind of clicks in place.
4  Topics / Robotics / Re: Desigining 3d Printer, Crane like Z-Axis (Up) Problem on: August 07, 2014, 03:09:44 pm
Looks like a Ormerod type design.

I was going to build my own but went down and picked up a XYZ DaVinci to get started.

Have a look at these.
5  Using Arduino / Project Guidance / Re: Robot arm project guidance wanted (transistors) on: August 03, 2014, 05:31:45 pm
I have read your post and have seen your desire to use transistors to control the motors.

OK I won't use the "H" word but how do you think these " _  " things are made?

When you do buy these "transistors" do yourself a favor and buy a few extras.
6  Using Arduino / Project Guidance / Re: Robot arm project guidance wanted (transistors) on: August 03, 2014, 02:25:46 pm
Hope these links will give you some guidance. Basically you are going to need H bridges to control them.
7  Using Arduino / Project Guidance / Re: Servo Motor Signal Problem on: July 29, 2014, 02:55:29 pm
You don't give the servo much time .

Also you might be driving the servo into it's limits (stops).

8  Using Arduino / Project Guidance / Re: Arduino and a 17 servo motor robot, possible? on: July 18, 2014, 11:52:45 am
It looks like the servos used are like the dynamixel type where they are on a daisy chain bus with each servo having an I.D. and have the ability to respond and respond back via commands. Don't know if they copied the dynamixels ver batim .

The dynamixels have been used with an arduino but don't know about these though. Are they pretty new to the public?

Maybe a little "sniffing" program might pick off some info if the manufacturer is keeping a lid on the command structure.
9  Using Arduino / Motors, Mechanics, and Power / Re: 360 degree 30kgcm servo on: July 06, 2014, 05:59:03 pm
Be aware about driving a sail winch servo into it's extreme ranges. I did by using the "Knob" example in the IDE .

On my servo (now dropped by Pololu (I wonder why)) when the pot on the arduino was rotated towards the extreme ends the servo would act like a continuous one by never stopping. Once the pot was brought back to the center position the arm (actually a drum) on the servo was miss located a lot. The servo did not work very well after that. From what I saw after opening it up the plastic gear got a little chewed up. Pololu on the product page had a snippet about it. The servo's pot had end stops that let it rotate only about 190-200 degrees.
10  Topics / Robotics / Re: Entry Level Robotics: How to get started on: July 02, 2014, 12:20:31 pm
If you are in the states then Maker Shed has teamed up with Radio Shack to provide a robot using an arduino. It looks like the kit is meant to do a line following one but it can be altered into other types. Do not know how long the Shack will be around though.

I checked around and my local stores have it in stock. They also have a motor kit with some wheels too.

Just something to chew on.
11  Using Arduino / Project Guidance / Re: 4 brush-less DC motors with integrated drive electronics using an Arduino Uno on: July 02, 2014, 12:06:42 pm
My contact from Precision Micro-drives was kind enough to send me a drawing and a link to explain how he would do it using MOSFET, however I'm afraid this is out of my league and I'm in need of someone to explain how all the components are working and why etc.


Haven't we already established that the motors don't support pwm?

The datasheet does state that but in the performance graph the voltage varies between 1.6 and 3.6  to show it's characteristics.
In the drawing provided the signal into the mosfet  does infer it though. The OP did not provide the "link"  so can it?

I would be tempted to try if I had a few extra . What happens to it if you do pwm it?

Got a pot to do a simple  varying voltage setup?  Does it work? Control the pot with a servo or get a digital pot.

12  Using Arduino / General Electronics / Re: SPI Inline Switch Challenge on: July 01, 2014, 08:56:02 pm
Does each slave need it's own address (CS) on the SPI buss? That is does the master send out the data to each slave individually or do they receive the same data at the same time and each slave figures out what it has to do with the data by sorting it out?

Even though the SPI has that speed can the master actually process the needed data for all 3 slaves at that rate?

Maybe a benchmark on what the master can actually output.

As a side note the 328 can use it's usart hardware in spi  mode but that would require some rethinking  on another level.
13  Using Arduino / Displays / Re: More trouble with my LCD on: June 28, 2014, 07:12:24 pm
From your picture it looks like you do not have the R/W or the Enalble of the LCD hooked up.

Since you cannot read from the LCD  just tie the R/W pin(5) to ground.

The Enable is used as a strobe to read the data lines. Somewhere in the documentation of the software you are using should show how all the pins are hooked up.
14  Using Arduino / Motors, Mechanics, and Power / Re: GBRL with custom function on: June 28, 2014, 01:03:41 pm
If you are only using 2 steppers with GRBL then maybe use the Z axis drive pins to control the 2 relays.

The direction pin could be used to select which relay to activate ( a little bit of logic) and the step pulse to activate the desired relay. Move Z plus for one and move Z minus for the other. Just need to play with the amounts to move the Z axis (maybe might need to play with # of steps per m.m. in the GRBL settings for the Z axis)  to figure timing of ON time for the relay.

The step pin of course would need to be run thru a rc filter to filter out the pulses but once the move is done then the pin goes low.

Just one way to do it without doing any software changes.
15  Using Arduino / Microcontrollers / Re: Analog Inputs/Outputs with ATTiny 84 on: June 20, 2014, 01:52:15 pm
Sure go ahead and take my words out of context but I'm just trying to learn you. smiley-twist

Simple coding in the world of the arduino does not require someone to fully understand the inner workings (gee like how does the pin create an output that can control something  with a varying voltage). If one wants to know then nothing is stopping them to do so. But to make someone at the very beginning to understand how it is done is not what  was intended.

As for yourself if you are so easily confused then maybe  it's time to teach something else.  smiley-evil

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