2 layers46 × 43 mm ServoTester, the printed circuit board in 3D

ServoTester

KiCad 9 PCB design for servo tester circuit

Size: 46 × 43 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 10
Nets: 8
Pads: 28
Tracks, vias: 68, 3
Pours: 1
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 19 May 2026
Updated: 19 May 2026

Overview

ServoTester is an open-source printed circuit board by saif-amara, from the saif-amara/ServoTester repository on GitHub. It is a 2-layer board of 46 × 43 mm with 10 parts on 8 nets, routed with 68 tracks and 3 vias.

It is built around the NE555P and 1N4148WT. Its parts include 3 resistors, 2 diodes, 2 connectors, 1 capacitor and 1 IC. It belongs with the robots and motor control boards of this library.

Main components

README

README.md

ServoTester 🎛️

A compact PWM servo motor tester PCB designed in KiCad 9, built around the classic NE555 timer IC in astable mode. Turn the potentiometer — the servo follows.

PCB 3D View

⚙️ How It Works

The NE555P is configured in astable (free-running) mode, generating a continuous PWM signal. A potentiometer (RV2) adjusts the RC time constants, which changes the duty cycle of the output pulse — directly controlling the servo motor's angular position.

PWM Pulse Width	Servo Position
~1 ms	0° (full left)
~1.5 ms	90° (center)
~2 ms	180° (full right)

🔌 Connectors

Connector	Function
J1 (2-pin)	Power input (5V DC)
J2 (3-pin)	Servo output — Signal / VCC / GND

🧩 Bill of Materials (BOM)

Ref	Component	Value / Part
U1	Timer IC	NE555P
D1	LED	Power indicator
D2	Diode	1N4148
RV2	Potentiometer	100kΩ
R1	Resistor	1kΩ
R3	Resistor	56kΩ
R4	Resistor	(see schematic)
C1	Capacitor	(see schematic)
J1	Connector	Conn_01x02
J2	Connector	Conn_01x03

📐 PCB Specifications

Layers: 2 (F.Cu / B.Cu)
Software: KiCad 9.0
Board label: servo motor tester
Designer initials: SEA

🚀 How to Open

Install KiCad 9

Clone this repository:

bash

git clone https://github.com/saif-amara/ServoTester.git

Open ServoTester.kicad_pro in KiCad
Open schematic: ServoTester.kicad_sch
Open PCB layout: ServoTester.kicad_pcb

📁 Project Structure

text

ServoTester/
├── ServoTester.kicad_pro     # KiCad project file
├── ServoTester.kicad_sch     # Schematic
├── ServoTester.kicad_pcb     # PCB layout
├── .gitignore
└── README.md

👤 Author

Saif Eddine Amara
Embedded Systems Engineering Student — ISSAT Sousse, Tunisia
Teaching Assistant, Robotics Lab

📄 License

This project is open-source under the MIT License.# ServoTester KiCad 9 PCB design for servo tester circuit

Parts

Qty	Value	Footprint	References
1	1.2k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R4
1	100k	Potentiometer_THT:Potentiometer_Alps_RK163_Single_Horizontal	RV2
1	1N4148WT	Diode_SMD:D_SOD-523	D2
1	1k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1
1	56k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R3
1	C	Capacitor_SMD:C_0504_1310Metric_Pad0.83x1.28mm_HandSolder	C1
1	Conn_01x02_Pin	Connector_Phoenix_GMSTB:PhoenixContact_GMSTBA_2,5_2-G-7,62_1x02_P7.62mm_Horizontal	J1
1	Conn_01x03_Pin	Connector_Phoenix_GMSTB:PhoenixContact_GMSTBA_2,5_3-G-7,62_1x03_P7.62mm_Horizontal	J2
1	LED	LED_THT:LED_D5.0mm	D1
1	NE555P	Package_DIP:DIP-8_W7.62mm	U1

Questions

How big is the ServoTester PCB?

It measures 46 × 43 mm and has 2 copper layers, 1.6 mm thick.

What parts does the ServoTester use?

10 parts, built around the NE555P and 1N4148WT. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the ServoTester KiCad files?

From the saif-amara/ServoTester repository on GitHub, at the commit this page was made from: the board is ServoTester.kicad_pcb and its schematic ServoTester.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the ServoTester design in my own project?

Its repository states no licence, so its author keeps all rights: ask saif-amara before reusing the design.

Category and platform

Robots and motor control

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/saif-amara-servotester" title="ServoTester in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/saif-amara-servotester.jpg" alt="ServoTester" width="1200" height="900">

A picture that opens the board, for a README

[![ServoTester](https://pcbkit.io/embed/boards/saif-amara-servotester.jpg?size=s)](https://pcbkit.io/boards/saif-amara-servotester)

Source

Repository: saif-amara/ServoTester
Board file: ServoTester.kicad_pcb
Commit: b36bab0
Licence: Not stated

Similar boards

2 layers52.1 × 37.5 mm
Sg90 driver
jacks-hax/Jerry
Jerry's brains ;)
32 parts1GPL-3.0
2 layers154 × 85 mm
Fuente-12v
brunogle/fuente-12v
Proyecto para la materia Electrónica de Potencia en UTN FRBA - Año 2025
98 parts
2 layers181 × 97 mm
OpenDeck r3.1.2
shanteacontrols/OpenDeck
A platform for building interactive control and sensing devices using MIDI and OSC built with Zephyr RTOS.
262 parts960Apache-2.0
2 layers255.9 × 99.3 mm
Zerosprey42
beekeeb/zerosprey42
Zerosprey42 Keyboard is a wired, beginner friendly, choc hotswap, MonoBlockSplit (Unibody), column-staggered, DIY mechanical keyboard.
96 parts140
4 layers65 × 56.5 mm
SH RPi
hatlabs/SH-RPi-hardware
Sailor Hat for Raspberry Pi hardware design files
168 parts56
2 layers59.6 × 42 mm
Macropad synthplug mk2
todbot/macropadsynthplug
Turn StemmaQT port by into Audio Out + MIDI In
43 parts53CC0-1.0
4 layers47 × 39.5 mm
Stealthburner Toolhead PCB
acha666/RP2040_ToolheadPCB_SB
A Toolhead PCB for VORON StealthBurner based on RP2040
145 parts43GPL-3.0
2 layers271.8 × 103.9 mm
Hotswap ble
ebastler/cornholius
ZMK-based replacement PCB for Cornelius keyboard
146 parts37