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Asked — Edited
Resolved Resolved by jstarne1!

Voltage Regulator For Servos

I need to provide external power for the servos as I'm using a lot of them. Can any one suggest any voltage regulator for the external supply of voltage and how do I connect them to the servos. Does anyone have some images of the wiring that would guide me...

Which voltage regulators shall provide the juice for the servos? I have four servos in each arm of the robot. Shall I use one voltage regulator for each arm?

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#30  
Ok I understand there is a miscommunication happening here. There is one regulator on the board at this time. Any voltage on the board must come through that regulator. My recommendation is to directly test the regulator that is still attached. Probe the pos emitter leg on the regulator still on the board.
#31  
I have a doubt... We have 2 voltage regulators LM1084 and MIC29300 on EZ-B V3... I would like to know what is the function of each of these voltage regulators? I mean what is the purpose of LM1084 and MIC29300?
#32  
the lm1084 is to power the digital pins (like servos) and the other regulator is for the microchip ic;)
#33  
Thank you, then how is the bluetooth powered?
#35  
Thank you @cosplaying_bunny , Now i knew that even my second regulator i.e. MIC29300 is also damaged... I coldn't get that regulator here... So is there any other voltage regulator that can be replaced with MIC29300 that has the same pins?

Please guide me through this...
#37  
Here, I post the video of my problem with the voltage regulators...





I guess the problem might be the capacitors that are associated on the board to the voltage regulators... @DJ please help me out as to what are the capacitors that are connected to the VR1 and to VR2 so that I can replace them with the ones compatible to the regulators I'm using...

Is it actually with the capacitors?
#38  
@pranav , I took a look at the video and I will look closer later today. The capacitors are in parallel not series so they can literally be completely removed and ezb still function. So you can eliminate capacitor as being your problem. It does appear your voltage regulator setup is functioning
#39  
Yes Josh, the voltage is appearing... But the LED on EZB and Bluetooth are not glowing and the voltage between 5V and GND is 1.2V... So, I'm confused... *eyeroll* *eyeroll* *eyeroll*
#40  
@pranav , it appears the board etchings may have been shorted out , because your barely getting voltage through them. The last component I can think of testing is the the resistors. Those are the only other inline components besides the etching that could have been damaged to cause these test results. Remove power , the chip and Bluetooth. Check the ohms of the resistors. Make sure they are within reasonable tolerance. If they have been damaged they may not allow voltage to pass through as normal. If the resistors are outside 10 percent tolerance then replace them. If they are correct impedance then it's the etching of the board thats damaged.

Sidenote: if the board etching is damaged though that will prevent the function of ezb you could try soldering jumpers from ground to the ground on the IC socket and power from regulator to the IC socket. That would bypass the damaged etching in the board. That's a last ditch effort to revive a badly damaged board so follow the resistor tests first.
#41  
Ok Josh, It's the worst case scenario... :(:(:(

I have to bypass the voltage.. Now where would the output of LM1084 go and where would the output of MIC29300 go?
#42  
Josh,
What is the ground and power on the IC socket? I mean where should I connect them on board? Where should I connect them to the microcontroller?
#43  
That's a great question , let me see if I can find the pin out for the pic and go from there.
#44  
Hey Josh, I found these pins on board... 5v, Gnd and Vin... Does that mean that the common ground would go there, the 5v i.e. the power for servos would go to the 5v and the input for microcontroller would go to the Vin?


User-inserted image
#45  
I'm not sure if that would bypass the damaged etching. I would probably run a power and ground to the two spots under the board that you test on. The ones directly underneath the Chip , I believe those are past the damaged etching , try applying power there and see if your electronics light up.
#46  
Josh.... Finally....... It's working... Thanks a lot for your support... I soldered the Vin directly beneath the board and the +5V and Gnd to the pins i mentioned in the picture... It's finally working.. It wouldn't be possible without your help... I'm wholeheartedly thankfl to you Josh... Finally we did it...:):):)
#47  
I really tortured that board all these days.. Now I understand the value of it... I gotta take care of it from now...
#48  
Yay ! I'm glad we found the problem and found a work around to repair your EZB , I'm seriously glad because I want to see that foamboard robot you made start moving around . :). Thankyou for your patience I just wanted to get you taken care of. Goodluck with Foambot 2000 ! - Josh
#49  
Thanks Josh, I shall post the project soon...