Arduinos and Microcontrollers ref: Rotary Table Mew 249

The photograph was up-side-down in the article (just to show that I have had a good read of what is a thought provoking article).

JA

sillyoldduffer,

I manged to alter the sketch to verify the key voltages and got similar results to your one.

If it helps other builders my LCD shield is badged DF ROBOT (Drive the Future)

This is the results I got.

• NO_KEY 1023
• RIGHT_KEY 0
• UP_KEY 98
• DOWN_KEY 253
• LEFT_KEY 408
• SELECT_KEY 639

My punishment for specifically referring to 'top left' of the photo in the text! Glad you found the article thought provoking, rather than baffling (I hope).

Cheers,

Dave

Good work, you're officially a computer hacker now!

My LCD is a DF Robot as well - perhaps they all produce voltages like that.

I haven't got any further than getting the arduino and display to work. I wrongly thought I had a suitable motor, lack of which has taken the wind out of my sales...

Cheers,

Dave

Silly Old Duffer, thanks for that about the potentiometer, I tried many turns both ways but still nothing. I might try uploading again to see what happens.

Certainly not baffling although I would not have started with a hot air engine.

Sorry. I think I have cross linked two threads again (that is this one is about the rotary table and I am referring to the hot air engine data logger).

JA

Edited By JA on 09/12/2016 23:23:54

Hi Roger,

Oh dear you might have a dud.

Uploading again is the right thing to do. Keep an eye on the console display at the bottom for error messages.

The other thing to check is that all the LCD plug pins are correctly located n the Arduino socket. I once managed to bend one behind...

Good luck,

Dave

S O Duffer, thanks for your help, I will have another look at it tomorrow. Cheers.

Just been looking for a suitable motor for this project. The one in the article is said to be 24 kg/cm torque but looking at the source metioned I cannot see one with that specification.

I am confused too about the voltage rating of these motors. I assume a 12v is needed as that is the supply voltage.

The one closest to the specified one has a rated voltage of 3v and the one used in the Liming article seems to be 8.6.

i am confused what to get!

Steppers often have a supply voltage higher than the supply used, if the driver uses pulse-width-modulation this allows a high-voltage peak to overcome the inductance of the winding is and get better motion. A bit like how PWM control is smoother for slow running on model railways than lowering the driving voltage.

Neil

It seems the other way around here though. The motors specified have a voltage less than the supply voltage.

Edited By Carl Wilson 4 on 11/12/2016 15:12:25

Oops got my description back to front!

Most stepper driver chips limit CURRENT making the actual voltage relatively unimportant, within limits.

So was it model number SY57STH76-2004A?

The stepper motor driver arrived today.

Looking at the connections shown in the magazine article and the original article the wiring diagram was taken from I notice misleading information.

The article shows the 12v power connected to Arduino terminals gnd and vdd. There is no vdd terminal on the Arduino it is in fact vin.

The 12v supply to the driver board is shown as gnd and VMot. Again there is no VMot terminal, well not on my board, It should be gnd and +24.

In the article too there is no mention of what the DIP switches should be set to for stop current, excitation mode and decay setting.

Just mentioning this in case anyone else is confused.

Catching up with this it looks like I was well off in assuming it had an interpreter. Good detective work chaps, sorry for misleading you.. If it can work on Linux I must see if I can run the IDE on a Pie then I can play with one at work.