2 layers148 × 84.5 mm
Panel daisy
ohmtech-rdi/eurorack-blocks
Software to Hardware Prototyping for Eurorack using C++, Max/Gen~ or Faust
259 parts410
6 layers138 × 191 mm
Handyplc
djmdjm/handyplcstm32f411-based PLC board
- Size
- 138 × 191 mm
- Copper layers
- 6
- Thickness
- 1.56 mm
- Parts
- 517
- Nets
- 366
- Pads
- 1,419
- Tracks, vias
- 2,941, 471
- Pours
- 46
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 17 Feb 2026
- Updated
- 8 Mar 2026
Overview
Handyplc is an open-source printed circuit board by djmdjm, from the djmdjm/handyplc repository on GitHub, published under the ISC licence. It is a 6-layer board of 138 × 191 mm with 517 parts on 366 nets, routed with 2,941 tracks and 471 vias.
It is built around the R-78E5.0-0.5, SPB09B-05 and NSI50010Y, with the AP2125KS-3.3TRG1, SM4007 and KT-0603R among its other parts. Its parts include 205 resistors, 95 diodes, 67 capacitors, 48 transistors and 40 ICs. It belongs with the STM32 boards of this library.
Main components
9
R-78E5.0-0.5
SIP,11.5x7.6mm-300mA、500mA -5V、5V 1 330uF、680uF 6.5V~36V、7V~31V 81%、90% Buck Short Circuit Protection SIP,11.5x7.6mm DC-DC Power Modules ROHSYLPTECDC-DC Power ModulesSPB09B-05
DIP,24x9.6mm1 1.6A 18V~36V 5V 85% DIP,24x9.6mm Power Module/Power Supply ROHSMWDC-DC Power Modules
NSI50010Y
SOD-123-55℃~+150℃ 1 10mA 30% 50V PWM SOD-123 LED Drivers ROHSonsemiLED Drivers
AP2125KS-3.3TRG1
SC-70-5-40℃~+85℃@(Ta) 1 200mV@(300mA) 3.3V 300mA 50uVrms 60uA 65dB@(100Hz) 6V Enable、Thermal Shutdown Fixed Positive SC-70-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SM4007
MELFMELF Diodes - General Purpose ROHSYONGYUTAIDiodes - General Purpose
KT-0603R
0603-40℃~+85℃ 1.6mm x 0.8mm square LED 1.8V~2.4V 120° 20mA 300mcd 40mW 615nm~630nm 645nm Discrete Diode Red Water Clear 0603 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - Discrete
ZXMS6004FFQ
SOT-23F-40℃~+125℃ 1 1.3A 350mΩ 60V Active High Low Side Switch Overvoltage protection、Overcurrent Protection、Over temperature protection、Short-Circuit Protection SOT-23F Power Distribution Switches ROHSDiodes IncorporatedPower Distribution Switches9HT12-32.768KDZY-T
SMD1610-2P-40℃~+85℃ 32.768kHz 7pF 90kΩ ±20ppm SMD1610-2P Crystals ROHSTXC CorpCrystals
SX20Y025000B61T002
SMD2016-4P-30℃~+85℃ 25MHz 60Ω 6pF SMD crystal oscillator ±10ppm SMD2016-4P Crystals ROHSTKDCrystals
README
README.mdHandyPLC
This is a small PLC-like device based around a STM32F411 microcontroller. It mostly exists because I wanted a PLC that I could program in Rust and without vendor toolchains or closed-source libraries.
Features and specifications
As the name suggests, HandyPLC is fairly general-purpose.
- Power supply: 24VDC nominal, 2A (worst-case). MCU power is isolated.
- Inputs: 16x isolated inputs. 5-36V
- General-purpose outputs: 16x isolated open-drain outputs. Can sink 33mA at 24V
- High-speed outputs: 4x isolated 5V logic outputs. Max 10mA.
- 3x signalling LEDs
- 3x micro-switches for UI
- USB-C interface (USB 2.0 only). Can be used for DFU.
- Spare GPIO brough out to IDC connectors and/or headers.
Firmware
There is no standard firmware for this device. The intent is that you fork
this repository and write your own. The firmware/ sub-directory contains
the Rust firmware that I use, but that is completely specific for my needs.
Mechanical
The carrier/ subdirectory contains CAD files for the holder/carrier that
I used to attach a HandyPLC to a DIN rail.
Bugs
Probably plenty. I'm not an Electrical Engineer and have no training or experience designing industrial devices.
Notice in particular that I have no provided any specification around the isolation properties of this device.
Use this completely at your own risk.
History
2026/02 - initial release (DVT 0.1)
Parts
517| Qty | Value | Footprint | References |
|---|---|---|---|
| 56 | 220 | Resistor_SMD:R_0402_1005Metric | R13, R102, R104, R108, R110, R114, R116, R120, R124, R129, R134, R139, R144, R149, R154, R159 +40 |
| 47 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C10, C18, C21, C23, C24, C25, C26, C27, C28, C29, C30, C31, C32, C33, C34 +31 |
| 40 | SM4007 | Diode_SMD:D_SOD-123 | D10, D11, D14, D16, D18, D20, D22, D24, D26, D28, D30, D32, D34, D36, D38, D40 +24 |
| 39 | KT-0603R | LED_SMD:LED_0603_1608Metric | D1, D2, D3, D13, D15, D17, D19, D21, D23, D25, D27, D29, D31, D33, D35, D37 +23 |
| 36 | TLP2395 | Package_SO:SO-5-6_4.55x3.7mm_P1.27mm | U2, U10, U11, U12, U13, U14, U15, U16, U17, U18, U19, U20, U21, U22, U23, U24 +20 |
| 34 | 10 | Resistor_SMD:R_0402_1005Metric | R122, R123, R127, R128, R132, R133, R137, R138, R142, R143, R147, R148, R152, R153, R157, R158 +18 |
| 34 | 2.2k | Resistor_SMD:R_0402_1005Metric | R15, R100, R106, R112, R118, R126, R131, R136, R141, R146, R151, R156, R161, R166, R171, R176 +18 |
| 33 | 100k | Resistor_SMD:R_0402_1005Metric | R18, R103, R109, R115, R121, R125, R130, R135, R140, R145, R150, R155, R160, R165, R170, R175 +17 |
| 32 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q1, Q3, Q10, Q12, Q14, Q16, Q18, Q20, Q22, Q24, Q26, Q28, Q30, Q32, Q34, Q35 +16 |
| 25 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4, R5, R14, R19, R33, R39, R45, R51, R57, R63, R105, R111, R117 +9 |
| 16 | 470 | Resistor_SMD:R_0402_1005Metric | R16, R35, R41, R47, R53, R59, R65, R71, R77, R83, R89, R95, R101, R107, R113, R119 |
| 16 | NSI50010Y | Diode_SMD:D_SOD-123 | D12, D46, D49, D52, D55, D58, D61, D64, D67, D70, D73, D76, D79, D82, D85, D88 |
| 16 | ZXMS6004FFQ | Package_TO_SOT_SMD:SOT-23 | Q2, Q5, Q7, Q9, Q11, Q13, Q15, Q17, Q19, Q21, Q23, Q25, Q27, Q29, Q31, Q33 |
| 9 | MountingHole | MountingHole:MountingHole_2.7mm_M2.5 | H1, H2, H3, H4, H5, H6, H7, H8, H9 |
| 8 | 2.2uF | Capacitor_SMD:C_1206_3216Metric | C2, C3, C9, C14, C15, C19, C20, C22 |
| 6 | 10uH | Inductor_SMD:L_0805_2012Metric | L1, L2, L3, L4, L5, L6 |
| 4 | 1k | Resistor_SMD:R_0402_1005Metric | R10, R11, R12, R20 |
| 4 | GND | djm:Testpoint_THTPad | TP4, TP5, TP6, TP7 |
| 4 | GND1 | djm:Testpoint_THTPad_Alt | TP8, TP9, TP10, TP11 |
| 3 | 2.2uF 100V | Capacitor_SMD:C_1206_3216Metric | C11, C12, C13 |
| 2 | 1500pF 2KV | Capacitor_SMD:C_1812_4532Metric | C16, C17 |
| 2 | 1uF | Capacitor_SMD:C_1206_3216Metric | C59, C60 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R26, R27 |
| 2 | 6pF | Capacitor_SMD:C_0402_1005Metric | C6, C7 |
| 2 | 7pF | Capacitor_SMD:C_0402_1005Metric | C4, C5 |
| 1 | 15k | Resistor_SMD:R_0402_1005Metric | R204 |
| 1 | 24VDC | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J39 |
| 1 | 4.7uF | Capacitor_SMD:C_1206_3216Metric | C58 |
| 1 | 9HT12-32.768KDZY-T | djm:Crystal_9HT12-32.768KDZY-T | Y1 |
| 1 | AP2125KS-3.3TRG1 | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U4 |
| 1 | BOOTLDR | Button_Switch_SMD:SW_SPST_CK_RS282G05A3 | SW1 |
| 1 | DEBUG | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J25 |
| 1 | GPIO1 | Connector_IDC:IDC-Header_2x06_P2.54mm_Vertical | J22 |
| 1 | GPIO2 | Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical | J23 |
| 1 | GPIO3 | Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical | J24 |
| 1 | I2C1 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | IN1 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J6 |
| 1 | IN10 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J15 |
| 1 | IN11 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J16 |
| 1 | IN12 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J17 |
| 1 | IN13 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J18 |
| 1 | IN14 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J19 |
| 1 | IN15 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J20 |
| 1 | IN16 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J21 |
| 1 | IN2 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J7 |
| 1 | IN3 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J8 |
| 1 | IN4 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J9 |
| 1 | IN5 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J10 |
| 1 | IN6 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J11 |
| 1 | IN7 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J12 |
| 1 | IN8 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J13 |
| 1 | IN9 | Connector_Kefa:Connector_KF142V_5.08_1x02_Vertical | J14 |
| 1 | LOGIC_OUT | Connector_IDC:IDC-Header_2x04_P2.54mm_Vertical | J29 |
| 1 | MCO1 | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP1 |
| 1 | MCO2 | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP2 |
| 1 | MCU_PWR | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J38 |
| 1 | OUT1-8 | Connector_Kefa:Connector_KF142V_5.08_1x08_Vertical | J4 |
| 1 | OUT7-16 | Connector_Kefa:Connector_KF142V_5.08_1x08_Vertical | J5 |
| 1 | R-78E5.0-0.5 | Converter_DCDC:Converter_DCDC_RECOM_R-78E-0.5_THT | U3 |
| 1 | RESET | Button_Switch_SMD:SW_SPST_CK_RS282G05A3 | SW2 |
| 1 | SPB09B-05 | Meanwell_SPB:SPB09 | U5 |
| 1 | SPI2 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J3 |
| 1 | STM32F411VETx | Package_QFP:LQFP-100_14x14mm_P0.5mm | U1 |
| 1 | SX20Y025000B61T002 | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y2 |
| 1 | UNISOLATED | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J37 |
| 1 | USART1 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J40 |
| 1 | USER1/BOOT1 | Button_Switch_SMD:SW_SPST_CK_RS282G05A3 | SW3 |
| 1 | USER2 | Button_Switch_SMD:SW_SPST_CK_RS282G05A3 | SW4 |
| 1 | USER3 | Button_Switch_SMD:SW_SPST_CK_RS282G05A3 | SW5 |
Similar boards
- 2 layers63 × 58 mm
OPNpool r5
cvonk/OPNpool
Integrates the functionality of a Pentair pool controller into the smart home using ESP32 SoC.
17 parts102 - 2 layers68.6 × 53.3 mm
Protogasm Board V2
Edging-Machines/Edging-Machines
This repository is intended to contain as much information as possible about building, designing, prototyping, and using automated edging machines.
14 parts67MIT - 4 layers231 × 67 mm
- 2 layers127 × 114.3 mm
- 4 layers58.4 × 101.9 mm
Up5k osc
emeb/up5k_osc
The brute-force approach is to synthesize these analog waveforms at sufficiently high sample rates that the timing jitter becomes imperceptible.
137 parts36MIT - 2 layers70 × 70 mm
MicroNet Teensy4
Rodemfr/MicronetToNMEA
A NMEA 0183 converter for Raymarine's wireless instruments ... and much more !
13 parts34GPL-3.0 - 4 layers19 × 111.1 mm
Gliss main
BelaPlatform/gliss-hardware
You can find the source KiCad files for the Gliss module in this repository. This project is open hardware and under the Creative Commons Share Alike license 4.0.
107 parts18
Questions
How big is the Handyplc PCB?
It measures 138 × 191 mm and has 6 copper layers, 1.56 mm thick.
What parts does the Handyplc use?
517 parts, built around the R-78E5.0-0.5, SPB09B-05, NSI50010Y and AP2125KS-3.3TRG1. 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 Handyplc KiCad files?
From the djmdjm/handyplc repository on GitHub, at the commit this page was made from: the board is hardware/handyplc.kicad_pcb and its schematic hardware/gp_input.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Handyplc design in my own project?
Its repository publishes it under the ISC licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).