feedback sa servo motors(sequencer 8 servo)

[e172ece]

i am using all e gizmo na components

a.)servo motors yun 880 petot 10 kg something
b.)sequencer
c.)servo driver

yun program naka while sa 90 degrees yun neutral position;

sequencer=( 750ma mga 7 volts dc = alexan mini drill dc adapter);

servo driver=( power supply na from ac, naka set sa 5 volts dc tapos yun
          amp auto detect siya)

yun pag plug in namin yun indictaor sa power supply sa servo driver ng shoshort siya  tumataas siya
 til 3amp tapos yun dc volts from 5 vdc to 3vdc

tapos nanginginig siya

Anu kaya problem?

>yun trouble shoot namin tinanggal namin yun lahat tapos tig iisa yun kabit then plugin  we found out na nasira yun dalawang servo motors namin;

inisolate namin yun lumabas dalwa sira we try na wag ikabit yun dalwang servo okay pag sinabay saka tig iisa sira siya ng feedback


feedback namin yun hindi siya fluent parang naka stepper motor yun galaw ;

huhuhuhu 

help naman po

[toasted siopao]

SG5010 servo ba ginamit mo? Di mo naman nabaliktad connections?

[e172ece]

SG5010 servo ba ginamit mo? Di mo naman nabaliktad connections?

i checked the sg5010 yan po itsura, di ko po hawak yun servo motors;

brown =ground;  sure naman po kami we checked the datasheet , tama naman po siya;

no bearing po ba kung mataas yun current sa servo motor kahit mababa yun voltage
kasi tuwing nanginginig yun servo motors namin like galaw ng stepper(MAS MALALA PA)
umi iilaw yun CC di ko po alam yun ibig sabihn nun sa power supply;
plus bumababa yunn voltage from 5vdc to 3vdc;
after po nalaman namin nasira yun dalawang servo motor

sa program po ba kaya yun?
(naka while lang po sa neutral position)

anu po kaya sira?
hardware or software?

appreciated po sa pagreply ate glenjoy(1 ganda point for you)

[toasted siopao]

i checked the sg5010 yan po itsura, di ko po hawak yun servo motors;

brown =ground;  sure naman po kami we checked the datasheet , tama naman po siya;

no bearing po ba kung mataas yun current sa servo motor kahit mababa yun voltage
kasi tuwing nanginginig yun servo motors namin like galaw ng stepper(MAS MALALA PA)
umi iilaw yun CC di ko po alam yun ibig sabihn nun sa power supply;
plus bumababa yunn voltage from 5vdc to 3vdc;
after po nalaman namin nasira yun dalawang servo motor

sa program po ba kaya yun?
(naka while lang po sa neutral position)

anu po kaya sira?
hardware or software?

appreciated po sa pagreply ate glenjoy(1 ganda point for you)

Ano power supply ginamit mo sa servo? Mga ilang volts? Mga around 5 to 6 volts lang ata ang kaya ng SG5010.

[e172ece]

Ano power supply ginamit mo sa servo? Mga ilang volts? Mga around 5 to 6 volts lang ata ang kaya ng SG5010.

5 volts lang po, tapos yun ampere auto detect it means it can give depende a needed ,

parang ameter lang po yun nakikita namin sa power supply na gamit namin sa project lab namin sa school

ng fefeedback po kasi tapos nagiging 3vdc saka 3 ampere which 1.2 amp lang kung normal operation

[toasted siopao]

Anung ibig mo sabihin na may feedback?

Kapag tumaas current demand ng load mo at bumagsak ang voltage ng supply, ibig sabihin di na kaya isustain ng source mo yung requirement ng load mo.

Pero there is still something wrong, your servo must not demand that kind of current, 3A is too high for SG5010.

Di ko alam specfic na ginawa nyo pero can you post an schematic at least? Or at least a block diagram?

[e172ece]

one ps for sequencer which is dc adapter na 750ma saka 7 vdc
one ps yun ginagamit sa mga lab, nakaset na 5 volts sa driver, ampere depends sa kinakain from the load as u said po.

yun grounding sa kanya kanyang grounding port kada circuit ;
tapos servo nakakabit sa driver.

panu po ba yun supplying power sa circuit namin?

8 servo po yun gamit namin

[toasted siopao]

Ibig mo sabihin, hiwahiwalay ground ng bawat supply mo? Dapat common ground sila lahat at dapat di mag float, kung hindi malaki chance na may masira ka na device. Connect mo lahat ng ground mo.

[e172ece]

Ibig mo sabihin, hiwahiwalay ground ng bawat supply mo? Dapat common ground sila lahat at dapat di mag float, kung hindi malaki chance na may masira ka na device. Connect mo lahat ng ground mo.

san ko po ilalagay yun common ground?
sa sequencer or sa driver?

[Kaizer03]

....

yun program naka while sa 90 degrees yun neutral position;

.....

you mean sa program mo something like this


while(1){
   MoveServo(90);
}

continues(infinite times) sya magprocess ng MoveServo Function to set your Servo in 90 Degrees?

[e172ece]

pero iba po yun amin , zero based (-90,0,90) po.

edit lang po sa from e gizmo codes

[toasted siopao]

san ko po ilalagay yun common ground?
sa sequencer or sa driver?

Basta connect mo lahat ng grounds mo, typical na issue ito ng mga gumagamit ng dalawang separate supply sa iisang circuit, nakakalimutan na i-connect or i-short yung grounds ng dalawang supply.

[e172ece]

Basta connect mo lahat ng grounds mo, typical na issue ito ng mga gumagamit ng dalawang separate supply sa iisang circuit, nakakalimutan na i-connect or i-short yung grounds ng dalawang supply.

kahit san ko po ba ilagay okay lang po ba ?

balak ko ilagay sa ground ng motor driver

[bravokilo]

Elcl172, hi!


     I have no experience with PIC programming but all the experience with analog servos. I even built servo amps of the 60's using discrete components,no IC. I built Receivers, Transmitters, servo amps, ESC over the years. Pls look up my post under communications engineering. I will be conducting a seminar at my home this
Sunday in BF Homes, Pque. If you are near and wants to attend, text me 0922 281 0680. Ok, it the following will help you.

     The servo amp has a bridge output to turn the servo motor either way. The supply line is connected directly to this bridge driver. Max of 6 volts is usual. I don't know if you are using a big servo but for the usual standard hobby servo, it should be within 200 ma. The signal regardless of where it is generated should be PWM since that is what the servo amp recognizes. If your 1.2 amp is for all the 8 servos,that is possible but that should be with the servos under load. Idling servos(meaning stopped) should draw minimal current. You should experiment with a single servo first. I imagine  that the sequencer you mentioned is the pulse generator for each of the servos sent to the servos serially. the first thing that you should check is for any mechanical stopper usual in hobby servos. If you did not remove this and programmed -90 to +90 degrees, your servos were stalling which explains the high current draw.And yet you said "while", did you mean this to be the same as idling or centered? If your servos kept rotating to one side, you have reversed connection to the feedback pot. Read my explanation in my post I mentioned above. The POT is supposed to control the locally generated negative pulse to match the incoming positive pulse. if the POT is reversed, the motor will never stop.

     You must isolate testing your sequencer and testing your servos. Get a hobby grade servo and test your sequencer first. Then build your servo.

     I imagine you have a PIC with 8 POTS to control 8 servos. You can learn to make an ENCODER for 8 servos in my seminar. A DECODER connected to the DECODER via 3 wires will individually control the 8 servos.  The advantage of PIC is you can adjust travel and perhaps add mixing.

    You were asking where to connect the 2 grounds of the two PS if I got you right. Well, join their black lines.

   Text me if you have a reply. If you are near BF Homes, Pque., I will welcome you to see me.

BK

[lapigut!]

news on this pls...

[nucleus]

may CC ang power supply mo meaning variable current yan

pag hindi stable ang servo motor 3 lang yan

unstable supply
overloaded motor
mali ang timing ng pulses galing sa controller mo

[bravokilo]

eratta: I meant ENCODER connected to a DECODER. Also ly posts on servos re in this section pala hinde sa communications engineering.

Sa programming kasi, you have to determine muna what keys to use. Pwede yung arrow left and right keys or put a joystick. pwedeng, may key to mean which servo. pero, kunyari, robot yan and you want a chain of commands to many servos, kailangan ng DECODER sa labas to separate the channels. Then you program say left yung 1st servo for 2 sconds, then cnter, 45 degrees yung second servo ....etc... yan sequence of commands. Example, press F! to start a sequence. The camera ounted on servo rotates slowly left, stop, turn right, stop, then center. Yan isang sequence yan. No need for a decoder kung isan srvo lang.Waht if may second servo to tilt the camera. You need a decoder na but the commands will still be serially coming out of your PIC.

BK

[lapigut!]

pano matest ang input sa sequencer???ayaw kasi sakin magmove when i press a button...
example if (PAIN & 0x80)==0) move(1,90,1);

which is ayw...pinalitan ko na rin ung input, ayw prin...mali ba ung gawa ko?