MG995 pulse

Lynxmotion Electronics & Software
1

Hi, i am newbie on servos, and Ssc…
I cant find my MG 995 servos pulses.

I m using Arduino with SSC32 controller, and there are 12 servos.
Its low part of my biped project. Only 2 leg assembled.

i try to sent first 600 for 0 degree, and 2200 for 180 degree. and 90 degree is 1400…
but there is a vibration, motors vibrating. i m thinking about its pulses.

And i sent to SSC board,

#0 P1400 #1 P1400 #2 P1576 #3 P1576 #4 P1488 #5 P1488 #6 P1312 #7 P1400 #8 P1576 #9 P1576 #10 P1488 #11 P1400 T10 <cr>

for left leg forward, right leg backward positon. (like legs stepping)

And question 2, i sent this code (upside) but motors positions not locked, they are going to down.

MG995 is high torque motors, and i know there are bad servos.
But i think i have a mistake about controlling…

any answers, or suggestions…?

thanks

picture of project…

http://img24.imageshack.us/img24/2937/grnt156.jpg

2

The MG995 should work as any servo, try to replace the servo with another. If that works, your MG995 are probably defect.

3

Thanks…
but i changed all of servos, its same.

4

So none of the MG995 work? Did you made any servo (other brand than towerpro) to work with the SSC32 at all?

And you are powering the servos with a separate battery (not the same as for electronics)?

I don’t know the Arduino, so I can’t help you there.

5

Instead of connecting everything all at once and expecting magic… a more conservative approach would be to start with 1 servo connected to output 0 of the SSC-32. Put a 6V battery on VS1, a 9V rectangle battery connected to VL with the clip provided in the SSC-32 package, the VL=VS1 jumper removed, the VS2=VS1 jumper installed, and have a Windows based PC with Lynxterm installed connected to the SSC-32. Now you can verify, slowly and thoroughly, that when power is applied the SSC-32 is found by LynxTerm, that the all home 1500mS button sends the servo to 0 degrees, that moving the slider on the screen for channel 0 moves the servo. If you can get that far then everything else is either power related (too small a 6V battery, too small wires, improper connections) or bad servos.

6

Yup I think you nailed it Eddie.

Sounds like the SSC-32 is resetting. :slight_smile:

7

With high torque comes high peak currents… coupled with the MG995 schizophrenic behavior the SSC-32 could be resetting dozens of times a second. :stuck_out_tongue:

8

hi thanks everyone.
i connected a source external, not battery.
and it says current on lcd.
not much current, not high 0.6amps.
but i want to ask.
i connected the source to VL.
not other pins. and give it 7.2V.
SSC32 led is blinking, is it shows to me its resetting?

sorry my english, and i m suprised forums support, thanks.,

edit…
i m using different sources for arduino and ssc32.

9

A battery can provide a lot of current in a short time. (surge)

A power supply may not be able to provide this large current surge.

What gauge of wire are you using?

10

i test ssc with lynx term program.
it works fine. and servos working.
my power supply can give me up to 6amps.
and now its lower than 1 amps.
cables are DATASENSOR photoreceptors cables.
“80’C vW-1 300V” written on them.

11

Are you still having trouble? I’m lost…

12

with using SSC 32 over Arduino TX-RX port, have problem.
not locked positions, and servo speeds, stabilities not same as SSC32 rs232 terminal program.

and searching ssc32 visual sequencer.
i am try to find any seller available now. but no body answer.
its not real product, only serial keys. but i am living in turkey.
additional, i have trouble for that, i have not time :frowning:

13

If it works in LynxTerm but not the Arduino then we will need a lot more information. Can you show the code? This should not be difficult. It’s just sending some simple ascii values to the serial port.

I have no idea what you are asking at the bottom. Not a real product? Serial keys?

14

arduino code is

void setup() {
  Serial.begin(9600);
}
void loop() {
  Serial.println("#0 P1400 #1 P1400 #2 P1576 #3 P1576 #4 P1488 #5 P1488 #6 P1356 #7 P1400 #8 P1576 #9 P1576 #10 P1488 #11 P1400 T10 <cr>");
}

i sent only serial data. arduino working, i am sure and tested

and bottom question…
Turkeys custom taxes very high, and i understand to Lynxmotion not to shipping Turkey.
May be another problems cause that but i cant buy any thing from lynxmotion.
prices very high other sites. and i want to buy first hand.
but Turkey not listed in Lynxmotions shipping list.

I want to buy servo bracket, but i cant.
now, i really need immediatly SSC32 visual sequencer for my biped school project. but i cant buy.

15

The LED on the SSC-32 is a status indicator.

Apply power, LED is on steady.

Send command to SSC-32 and LED goes off.

Send another command to the SSC-32 and the LED blinks.

The LED blinks every time it receives data. This is normal…

Apply power, LED is on steady.

Send command to SSC-32 and LED goes off, servos move, then go limp, then LED is on steady. This is NOT normal.

If this happens, remove the VS=VL jumper and power the SSC-32 VS with a 9vdc battery all by itself. This is what Eddie was wanting you to do. Did you try it?

16

i have MG995 for my hexapod too.
one thing - MG995 is cheap shi… servo with high torque ~10$ for 15Kg/cm.
as for my opinion, there are bad pots inside or something else. sometimes servo just twiching what looks like agony of spider lol.
i am searching cure for that but not sure about any success :unamused: