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Questions tagged [servo]

A kind of motor with automatic feedback, usually for positioning, such as a hobby RC servo.

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EnDAT encoder resolution issues

I am working with an old motor with EnDAT encoder, no documents are available. The protocol is implemented on FPGA and can be changed, as needed. Somehow the encoder sends 13 bits. Other servo drive ...
TQQQ's user avatar
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-1 votes
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48 views

How do I increase the torque of my dc geared motor [closed]

I have been working on a project for quite some time now that uses a DC motor to spin a wheel that unravels a tape measurer (making an extendable lightsaber), and I have been running into an issue ...
Matthew Meerdink's user avatar
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2 answers
62 views

Darlington control with Op Amp and DAC

The purpose of my circuit is to control(current) a servo motor with the 4096 steps of the DAC MCP4725. Currently this circut is not turning on the NPN Darlington, I don't know why that. The DAC is ...
johnnytolengo's user avatar
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37 views

Home a servo motor after power shutdown

Background: I'm trying to setup a servo motor 1171MG with a 555 timer and finetune the position with a potentiometer as it depends on various project aspects. The circuit is driven by a small board &...
Squiffy's user avatar
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1 answer
42 views

Continuous rotation servo with software PWM not working as expected

I have a continuous rotation SG90. I am trying to implement software PWM (because the orangepi sbc I am using doesn't support hardware PWM yet). I got a bunch of electronics from a friend so I don't ...
Yuki.kuroshita's user avatar
5 votes
2 answers
727 views

Powering two 12VDC servos with a 24VDC supply

If I have two servos rated as 12VDC with a maximum draw of 2A. Can these be reliably powered in series using a 24VDC supply? My question is how stable would the voltage be expected to be given the ...
RapidOvertake's user avatar
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1 answer
64 views

Electronic speed controller - how to know what frequency for servo pulses? Why use 50 Hz?

I was doing a Raspberry Pi project controlling a BLDC motor with an BLHeli32 ESC. I sent servo pulses with maximum width 2 ms and minimum width 1 ms. The frequency I sent these pulses at is 50 Hz. ...
Tsz Kit Koon's user avatar
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How to Power 2 MG996R Tower Pro Servo

I tried powering a MG996R Tower Pro (180 deg metal gear) servo from an Arduino UNO and ended up hibernating the host PC. I want to power two such motors (in parallel configuration) for 10 minutes a ...
Aditya Jain's user avatar
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66 views

Motion controller using brushed DC motors

I've designed a simple robot with 2 active wheels and 4 omni wheels and I'm trying to figure out the motion controls. I'm using 8300 RPM motors (https://uk.rs-online.com/web/p/dc-motors/3213192) which ...
OM222O's user avatar
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1 answer
61 views

Par control in DC servomotor

How can I control the torque of a DC servo? Servo model: DS51150-180 https://i.ebayimg.com/images/g/pEkAAOSwmFNl4NkA/s-l1600.jpg The current in a DC motor, as well as in a servo, determines the ...
Gael Alejandro's user avatar
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1 answer
117 views

Powering a dc motor from a robotics set with a USB 3.0 PC port

I got my hands on a Gigo microbit robotics set. It uses a control box to house the microbit. As you can see from the control box specs, it uses 6 AA batteries, but it can also use an external micro-...
Wizard's user avatar
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Controling servos with a PCA9865

I have a basic setup controlling a servo using a PCA9865. Given some servos under full load, can they draw 1 A? I am probably going to exceed the current limit of the device. How would you control 12 ...
Rob 's user avatar
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2 answers
63 views

Positionally aware 360° (or beyond) motor (DC or stepper)?

Most servo motors out there are driven within 180° (at least hobby ones). There are more bulky and expensive servos out there as well. Since, I have tight space constraints, I am looking for a ...
VPNer's user avatar
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2 votes
1 answer
49 views

Two NiMH AA batteries powering servo circuit

My project has an ESP32 C3 and 9g servo. It has to be mobile, thus battery powered. Due to space constraints, I can’t use 4 AA batteries even though that would be ideal. I would like to use two NiMH ...
cjb567's user avatar
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2 votes
1 answer
452 views

Why are servo potentiometers in the 5k range?

I've looked around a bit and it seems that servo potentiometers are in the ~5kOhm range. Why 5k? Ultimately it's just a linear voltage divider, so: Aside from idle power consumption, does the value ...
KJ7LNW's user avatar
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1 vote
1 answer
93 views

How does deceleration work on a servo drive?

I'm confused by the fact that PLCopen MC-blocks used to control servo drives from a PLC have separate acceleration and deceleration parameter. For instance, MC_MoveAbsolute. I don't understand what ...
relatively_random's user avatar
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49 views

Powering Raspberry Pi and 11 servos on one battery pack

I am working on making Sox from Lightyear using a Raspberry Pi as the main board. I have a PCA9685 servo controller that can drive up to 16 servos using I2C. The issue I am facing is that my X728 ...
Collin's user avatar
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1 answer
53 views

What wire to use for about five 5 V 1 A continuous servo motors in parallel?

I am not particularly familiar with electronics and circuits in general although I do have some basic experience. My concern is that to carry enough current for all five motors I would need at least 5 ...
James Taylor's user avatar
0 votes
1 answer
146 views

Torque in kg·cm vs N·cm (servo vs rotary switch)

I don't understand the different specifications of the maximum force of a servo motor vs the torque of a rotary switch. In the following example, there is a servo spec'ed at "Maximum Torque at 6V:...
0__'s user avatar
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1 answer
419 views

Right Way to Step Down a PWM Signal

I need to control 4 servos using a PLC that operates with 24V. The problem is that servos use only 5V. To accomplish this, I built a simple circuit using some 7805 and a large 1000 µF capacitor to ...
Rafa Borges's user avatar
1 vote
0 answers
67 views

Getting "servo jitter" when trying to move Actuonix actuator slowly. Works fine when going from 1-2 ms in RC protocol

I have a PQ12-30-6-r Actuonix actuator that's moving erratically. When I set the width of the pulse from 1-2 ms then it will move down immediately, and vice versa back up. I can go to 1.5 ms as well, ...
Lloyd Hussell's user avatar
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0 answers
25 views

Floating point on Cam Tables?

What's the general way to handle floating point error on a cam table? Constraints are using: PLC Open function blocks Scale on application units for servo setup is an ...
Jamie Marshall's user avatar
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43 views

Can the effective transmission rate from a python script to an arduino be increased when using serial communication?

I attempting to move a servo (controlled by an Arduino) with a Python script. The Python script issues a command to the Arduino to tell it where to move the servo head to. The communication is handled ...
Slash's user avatar
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51 views

Troubleshooting servo issue on custom PCB

There is an issue on my custom ESP32 PCB board. One of its features is to control a very high torque hobby servo motor (this one). The PCB works perfectly with a bench power supply but not with a ...
AyubowanPro's user avatar
1 vote
2 answers
73 views

Raspberry Pi Pico controlling servo and timer

I would like to create a program that uses a Raspberry Pi Pico, this four-digit seven-segment display, SG90 micro servos, and one of these buttons. My idea is that every time the button is depressed, ...
Vorde Vord's user avatar
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0 answers
131 views

Do I need to level shift the PWM signal from a Raspberry Pi Pico for regular RC servo?

I am trying to control regular SG90 servo with a Raspberry Pi Pico. My problem is that those servos produce maximum torque while powered by voltage between 4.8V to 6V (5V is optimal for me.) I powered ...
Papouc's user avatar
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3 answers
1k views

How to power multiple servo motors?

I'm doing a robot arm for a project, but programming has become the least of my problems. I don't know how to connect the servo motors. I have a power module that apparently has around 5 V of output (...
Akko's user avatar
  • 3
5 votes
2 answers
828 views

What could've killed my ESP32S MCU?

I'm making my project and I managed to kill 2 ESP32 boards. First time I thought it was just accident (me shorting 2 wires) because my cables were messy, but it happened again and the circumstances ...
krystof18's user avatar
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1 answer
116 views

Can not get maximum torque (stall torque) when current reach peak current

I am using FOC to control torque of 220V AC servo (SPMSM) with 36V power supply at low speed (100-200rpm). I tested with some servos (different manufacturers) which has specs as the below table. But I ...
Breezehn's user avatar
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79 views

Do you need a decoupling capacitor for an RC servo connector?

I have watched a lengthy youtube video about decoupling capacitors and how you should use them. I am in doubt if you should add decoupling capacitors in front of 3p connectors for RC servo motors such ...
bask185's user avatar
  • 616
1 vote
2 answers
363 views

Prevent RC hobby servo from moving during power up

I have this unfinished PCB with 12 servo connectors and a buck converter circuit (the inductor has no 3D model yet.) I want to prevent these RC hobby servos from moving at all when I power up this ...
bask185's user avatar
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0 votes
1 answer
191 views

How can I reduce voltage for my Arduino?

I would like to use a muscle signal sensor for controlling the servo motors and LEDS through my Arduino. I would like to reduce the voltage from 18V to 9V on the signal wire (green wire on the picture)...
Robin K's user avatar
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124 views

Controlling multiple continuous rotation servomotor for a vending machine subsystem

I am trying to implement/design my own snack's vending machine and I have already solved the payment transactions through MDB components and communicating them by means of a MDB to Serial adapter to ...
imt_blake's user avatar
  • 441
3 votes
2 answers
474 views

Can a BLDC motor be actively retarded (braked) by decreasing the electrical drive frequency?

I need to implement very fine (positioning) control of my BLDC motor system, one which has significant inertia. Basically servo control of a weighty object. Is it possible for a BLDC motor be retarded ...
Ant Williams's user avatar
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0 answers
49 views

The interaction between the encoder and the servo Arduino Uno

Why when the turn occurs in the + direction, it is also read -. Assignment: reading of the encoder occurs with a period of 100 mc, when the encoder rotation is detected the servo also rotates by 2 ...
Vasil Petrovich's user avatar
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0 answers
53 views

How would I connect 12 MG996R servo motors to a 4.8 volt four AA power supply via GPIO pins common between all parts?

The servo motors have GPIO wires for data, ground, and voltage. I have a power supply that, similarly to the servo motors, has a GPIO pinout with ground and voltage. The problem I'm running into is ...
K-Fehrb.'s user avatar
0 votes
2 answers
302 views

What is the control chip name of a MG90S servo motor?

I'm learning about servos, and was wondering about the control chip name of MG90S. I do not have the possibility to open one at the moment. It seems that this information is not easy to find, in ...
verbessern's user avatar
2 votes
0 answers
64 views

Why is connecting an analog servo distorting this PWM-wave?

I'm working on a project where I'm trying to steer an analog servo using a PWM-wave generated by this circuit. I found the circuit design from this article. It consists of three operational amplifiers ...
Josef A's user avatar
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1 vote
1 answer
79 views

What is this 3 pin connector?

I wanted to integrate this piece in one of my projects but I can't find the cable that fits it's 3 pin and the outside dimensions are: w : 4.5 mm h : 2 mm I tried with a SH1.0 cable but the height is ...
winterst's user avatar
0 votes
0 answers
133 views

H-bridge servo circuit design

I have bought several servos from Aliexpress, namely the DS3235SG. Since a few the servo-boards burned up and replacement is not available, I went through the process of reverse engineering the ...
vulubalulu balulu's user avatar
1 vote
2 answers
856 views

Servo motor doesn't go beyond 90° when driven by an ESP8266

I have interfaced a Tower Pro SG90 servo with a Raspberry Pi and ran sweep.py which takes the servo from 0 to 180° perfectly fine. When I interface the same servo with an ESP8266 and use the <servo....
Fenomatik's user avatar
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0 answers
49 views

RC servo power switch not working properly

I am troubleshooting an ESP32 PCB I designed. Every function is working properly except the RC servo (Futaba HPS-AA701) I am using is not switched off when its ground is opened by a switch. My PCB is ...
AyubowanPro's user avatar
1 vote
2 answers
73 views

Recommended device for an airplane motorized throttle

I'm trying to implement an 737 motorized throttle. For those not familiar, it's something that's on a motor shaft and needs to move about 80-90 degrees. Max. load is about 2-3 lbs. I also need the ...
dashman's user avatar
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0 votes
0 answers
56 views

Closed loop system of servo motor for master and slave flex

I am really new in Arduino. So what I have is two flex sensor, a master flex for the left hand and a slave flex for the right hand. What it will do is that when the master flex is bent, the servo ...
Jiayu's user avatar
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0 votes
0 answers
64 views

Foldback current limiting in RC servo application

Background: A 7.4V 2Ah battery (LP-E6 from Canon) powers our system (camera/laser mounted on a one-axi gimbal). The gimbal motor is an RC servo (HPS AA701 from Futaba) connected directly to the ...
AyubowanPro's user avatar
0 votes
0 answers
578 views

Servo motor duty cycle to angle

I am trying to control a servo motor using a square signal with a varying duty cycle. The data sheet of the motor says that the frequency of the signal should be 20 ms. In addition, if I need to ...
tonyjk's user avatar
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0 votes
2 answers
54 views

How To Install Batteries For A System Consists Of Different Components That Work On Different Voltages?

My System Consists Of Three Different Components (Arduino - MicroServos - LED(12v)), Can I Install Batteries As Shown In This Image? Description: Connecting Three Batteries In Series, And Take A ...
A_Asaker's user avatar
1 vote
2 answers
273 views

Advice on translating a 3V3 PWM signal to a 6V PWM signal

I'm trying to control 3 20Kg servo motors powered by 6V (Link to servo motor datasheet here), using an STM32L5 microcontroller. Currently, the design uses an Arduino Pro Mini powered by 5V, and using ...
E.HP.S's user avatar
  • 349
0 votes
0 answers
150 views

Servo motor control maximum angle modification

I'm trying to figure out if it is possible to modify a JX Servo PDI-6208MG 8KG Servo 120 Degree 0.07 sec, which matches the required speed, size, and torque, but make it rotate over 270°. I'm using an ...
emss's user avatar
  • 1
0 votes
0 answers
76 views

ATmega2560 fast enough?

I want to drive a servo with the ATmega2560. I'm wonder if it can handle the 10 kHz encoder at full speed and the 3-phase chopper the driver has to operate (runs at 12 kHz). Or do I need to start ...
Alan van de Glind's user avatar

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