2 layers
Maglev26
Hansolini/Take-home-Maglev-lab
A small lab for students in control engineering to learn control topics at home!
60 parts15MIT
2 layers49 × 37 mm
Servo controller
rmingon/servo-controllerCustom-made dual-servo testing platform. It is designed for engineers, makers, and robotics developers who need a reliable and convenient way to drive and test two RC servos simultaneously from a PC.
- Size
- 49 × 37 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 31
- Nets
- 52
- Pads
- 136
- Tracks, vias
- 144, 16
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 13 Sep 2025
- Updated
- 14 Sep 2025
Overview
Servo controller is an open-source printed circuit board by rmingon, from the rmingon/servo-controller repository on GitHub. It is a 2-layer board of 49 × 37 mm with 31 parts on 52 nets, routed with 144 tracks and 16 vias.
It is built around the ATMEGA328PB-AU, CH340C and LM1117S-5.0. Its parts include 12 capacitors, 6 connectors, 3 ICs, 2 resistors and 2 diodes. It belongs with the robots and motor control boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATMEGA328PB-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 27 2KB 32KB 8 Bit AVR Built-in FLASH Power-on reset (POR)、Undervoltage detection (BOR/LVD/LVR/LVI)、Watchdog reset、External pin reset (NRST)、Built-in general-purpose timer、Programmable watchdog、Touch function TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
CH340C
SOP-16-20℃~+70℃ 2Mbps 3.3V、5V 50uA 7mA Transceiver USB 2.0 SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
LM1117S-5.0
SOT-223-3-40℃~+125℃@(Tj) 1 1.2V@(1A) 100uV 12V 1A 5V 5mA 75dB@(120Hz) Fixed Over Temperature Protection Positive SOT-223-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHTCVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdDual Servo Test Board
This repository contains the design files, schematics, and PCB layout for a compact, custom-made dual-servo testing platform. It is designed for engineers, makers, and robotics developers who need a reliable and convenient way to drive and test two RC servos simultaneously from a PC.
Overview
This board is built around the ATmega328P microcontroller (the same MCU used in Arduino Uno), making it extremely flexible and easy to program. Communication with the host PC is handled via an onboard CH340 UART-to-USB bridge, enabling simple plug-and-play connectivity over USB.
The board includes XT60 and XT30 connectors for safe and reliable power input, making it suitable for lab bench setups or battery-powered applications.
Features
-
Dual Servo Control
Two independent PWM channels allow you to control and test two RC servos simultaneously. -
Robust Power Delivery
- XT60 and XT30 connectors for battery/power input
- Onboard LM1117-5 voltage regulator for a stable 5V rail
-
USB-to-UART Interface
- CH340 USB-to-serial converter
- Direct connection to PC for programming and control
-
Microcontroller
- ATmega328P running at 16 MHz
- Fully Arduino-compatible for easy firmware development
-
Test Points & Expandability
- Breakout headers for ISP programming
- Extra I/O pins available for debugging or future expansions
Connectors & Interfaces
| Connector | Function |
|---|---|
| XT60 | Primary power input (+BAT, GND) |
| XT30 | Secondary power option |
| USB-C | UART communication with PC |
| J3 | AVR-ISP programming header |
| J4 / J5 | Servo PWM outputs |
Electrical Characteristics
| Parameter | Value |
|---|---|
| Input Voltage | 6 – 12 V (recommended) |
| Logic Voltage | 5 V |
| PWM Frequency | ~50 Hz (standard RC servo) |
| MCU Clock | 16 MHz |
Software & Usage
- Connect Power via XT60/XT30 (or USB for low-power testing).
- Connect to PC via USB-C cable.
- Flash firmware using the Arduino IDE or
avrdudeover ISP. - Use the provided PC software or your own serial commands to control PWM output and test servo movement.
Project Files
This repository contains:
- KiCad PCB Layout (
hardware.kicad_pcb) - Schematic (
hardware.kicad_sch) - Project Configuration Files (
.kicad_pro,.kicad_prl) - 3D Render and PCB previews
Applications
- Servo quality testing (batch verification)
- Robotics development and debugging
- Educational tools for learning PWM and MCU programming
- Rapid prototyping for motion-control projects
Future Improvements
- Add current sensing for each servo channel
- Optional I²C/UART expansion for external sensors
- Integrate reverse-polarity protection on power input
Parts
31| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100nF | Capacitor_SMD:C_0603_1608Metric | C9, C17, C18 |
| 2 | 100n | Capacitor_SMD:C_0603_1608Metric | C11, C12 |
| 2 | 10nF | Capacitor_SMD:C_0603_1608Metric | C16, C20 |
| 2 | 10pf | Capacitor_SMD:C_0603_1608Metric | C7, C8 |
| 2 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4, J5 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | D1, D2 |
| 2 | R_Potentiometer_Trim | Potentiometer_THT:Potentiometer_Runtron_RM-065_Vertical | RV1, RV2 |
| 1 | 1.1K | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 10n | Capacitor_SMD:C_0603_1608Metric | C14 |
| 1 | 10pF | Capacitor_SMD:C_Elec_3x5.4 | C19 |
| 1 | 1p | Capacitor_SMD:C_0603_1608Metric | C15 |
| 1 | 500 | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | ATmega328PB-A | Package_QFP:TQFP-32_7x7mm_P0.8mm | U2 |
| 1 | AVR-ISP-6 | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J3 |
| 1 | CH340C | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U4 |
| 1 | Conn_01x02 | Connector_AMASS:AMASS_XT30U-F_1x02_P5.0mm_Vertical | J2 |
| 1 | Conn_01x02 | Connector_AMASS:AMASS_XT60-F_1x02_P7.20mm_Vertical | J1 |
| 1 | Crystal_GND24 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | L | Inductor_SMD:L_0603_1608Metric | L1 |
| 1 | LM1117S-5 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | USB_C_Plug | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | P1 |
The 29 most common of 31 parts.
Questions
How big is the Servo controller PCB?
It measures 49 × 37 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Servo controller use?
31 parts, built around the ATMEGA328PB-AU, CH340C and LM1117S-5.0. 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 Servo controller KiCad files?
From the rmingon/servo-controller repository on GitHub, at the commit this page was made from: the board is hardware/hardware.kicad_pcb and its schematic hardware/hardware.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Servo controller design in my own project?
Its repository states no licence, so its author keeps all rights: ask rmingon before reusing the design.
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