2 layers128.2 × 112.1 mm
2 layers363.5 × 84 mm
Plc-4u a
semicontinuity/embedded1Embedded projects
- Size
- 363.5 × 84 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 221
- Nets
- 182
- Pads
- 562
- Tracks, vias
- 1,149, 45
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 28 Jun 2012
- Updated
- 8 Sep 2026
Overview
Plc-4u a is an open-source printed circuit board by semicontinuity, from the semicontinuity/embedded repository on GitHub. It is a 2-layer board of 363.5 × 84 mm with 221 parts on 182 nets, routed with 1,149 tracks and 45 vias.
It is built around the ATMEGA16-16PU, MAX485ED and SIM800, with the IRF4905, MMBT3904 and PESD2CAN among its other parts. Its parts include 88 connectors, 67 resistors, 23 ICs, 13 diodes and 10 transistors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
6
ATMEGA16-16PU
PDIP-40-40℃~+85℃ 10bit 16KB 16MHz 1KB 32 4.5V~5.5V 512Byte 8 Bit AVR Built-in FLASH PDIP-40 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
MAX485ED
SOP-8-40℃~+85℃ 1 1 1mA 32 4.75V~5.25V 5Mbps Half-Duplex Transceiver ±8kV SOP-8 RS-485 / RS-422 ICs ROHSHTCRS-485 / RS-422 ICs
SIM800
SMD,24x24mm1mA 3.4V~4.4V GSM I2C、USB、UART、GPIO、SIM card SMD,24x24mm 2G/3G/4G/5G Modules ROHSSIMCom Wireless Solutions2G/3G/4G/5G Modules
IRF4905
TO-220-35℃~+175℃ 1 P-Channel 12nF 150nC@10V 1nF 2.5V 200W 450pF 60V 75A 9mΩ P-Channel TO-220 MOSFETs ROHSCmosMOSFETs
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)PESD2CAN
SOT-23-55℃~+150℃ 1nA 2 230W@8/20us 24V 25pF 28V 41V 5A@8/20us Bidirectional ESD IEC 61000-4-2、IEC 61000-4-5 SOT-23 ESD and Surge Protection (TVS/ESD) ROHSNexperiaESD And Surge Protection (TVS/ESD)
README
README.mdEmbedded projects.
Projects for AVR microcontrollers.
- Primitive alarm
- Primitive terminal
- Voltage relay
- Mood lamp - firmware under development
- Primitive motion sensor controller, that works in pair with primitive alarm
- Servo controller - unfinished, no firmware yet
- LED dimmer, controlled via CAN bus
- CAN bus router - firmware under development
- Roller shutter controller, controlled via CAN bus
- Humidity meter
Parts
221| Qty | Value | Footprint | References |
|---|---|---|---|
| 21 | PC817 | Package_DIP:DIP-4_W7.62mm | U2, U3, U4, U10, U11, U12, U13, U14, U15, U16, U17, U18, U19, U20, U21, U23 +5 |
| 16 | 820 | Resistor_SMD:R_0805_2012Metric | R3, R4, R7, R10, R13, R14, R15, R27, R28, R39, R55, R56, R57, R58, R59, R60 |
| 15 | 1k | Resistor_SMD:R_0805_2012Metric | R17, R18, R19, R20, R36, R37, R43, R44, R45, R46, R47, R48, R49, R50, R61 |
| 14 | R | Resistor_SMD:R_1206_3216Metric | R16, R21, R22, R23, R24, R25, R26, R30, R31, R32, R33, R34, R35, R38 |
| 7 | R | Resistor_SMD:R_0805_2012Metric | R51, R52, R53, R54, R62, R64, R65 |
| 7 | VSS | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J72, J73, J74, J75, J76, J87, J88 |
| 6 | 5.1k | Resistor_SMD:R_0805_2012Metric | R2, R6, R9, R12, R41, R42 |
| 6 | 8.2k | Resistor_SMD:R_0805_2012Metric | R1, R5, R8, R11, R29, R40 |
| 6 | D | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D5, D6, D7, D8, D9, D10 |
| 6 | IRF4905 | Package_TO_SOT_THT:TO-220-3_Vertical | Q1, Q2, Q3, Q4, Q5, Q6 |
| 6 | MOMENTARY-SWITCH-SPST-LED-PTH-12MM | mod:TACTILE_SWITCH_LED_PTH_12MM | S1, S2, S3, S4, S5, S6 |
| 6 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4, H5, H6 |
| 5 | NC | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J58, J79, J80, J81, J82 |
| 5 | Screw_Terminal_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J1, J2, J3, J4, J5 |
| 4 | C | Capacitor_SMD:C_0805_2012Metric | 22pF1, 22pF2, C1, C3 |
| 4 | LED_Dual_KAK | LED_THT:LED_Rectangular_W5.0mm_H2.0mm-3Pins | D1, D2, D3, D4 |
| 4 | Leak sensors | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J14, J21, J39, J40 |
| 4 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q7, Q8, Q9, Q10 |
| 4 | S3 S5 LEDs | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J12, J23, J25, J48 |
| 4 | VDD | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J69, J70, J77, J78 |
| 2 | 10 | Resistor_SMD:R_1206_3216Metric | R66, R67 |
| 2 | GND | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J60, J61 |
| 2 | I2C | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J15, J16 |
| 2 | LED | LED_THT:LED_D3.0mm | D11, D12 |
| 2 | PWR_OUT | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J35, J38 |
| 2 | RXD | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J83, J84 |
| 2 | S3BTN | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J27, J31 |
| 2 | S4 S6 LEDs | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J24, J26 |
| 2 | S4BTN | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J28, J32 |
| 2 | S5BTN | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J29, J33 |
| 2 | S6BTN | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J30, J34 |
| 2 | TA_C | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J17, J41 |
| 2 | TB_C | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J42, J45 |
| 2 | TC_C | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J43, J46 |
| 2 | TD_C | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J44, J47 |
| 2 | TXD | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J85, J86 |
| 2 | U8 OUT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J57, J59 |
| 2 | VCC | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J62, J63 |
| 2 | VDD VSS | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J67, J68 |
| 2 | Valve control in | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J13, J22 |
| 2 | Valve leds | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J19, J20 |
| 2 | X0 | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J51, J53 |
| 1 | ATmega16-16P | Package_DIP:DIP-40_W15.24mm | U1 |
| 1 | AUX_INS | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J10 |
| 1 | AVR-ISP-10 | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J55 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | C_Polarized | Capacitor_SMD:C_1812_4532Metric | C2 |
| 1 | Crystal | Crystal:Crystal_HC49-4H_Vertical | Y1 |
| 1 | Dir Control | Jumper:SolderJumper-3_P1.3mm_Bridged2Bar12_Pad1.0x1.5mm | JP1 |
| 1 | MAX485E | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U22 |
| 1 | PA0 | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J56 |
| 1 | PESD2CAN | Package_TO_SOT_SMD:SOT-23 | D13 |
| 1 | R | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P5.08mm_Vertical | R63 |
| 1 | RESERVED_IN | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J71 |
| 1 | RES_IN | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J65 |
| 1 | S1 S2 BTNS | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J50 |
| 1 | S1 S2 LEDs | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J49 |
| 1 | SELF_PWR_IN | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J66 |
| 1 | SIM800 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J64 |
| 1 | Sensors AB | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J36 |
| 1 | Sensors CD | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J37 |
| 1 | U8 IN | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J52 |
| 1 | V_ST_CWS | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J7 |
| 1 | V_ST_HWS | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J6 |
| 1 | W_CT_CWS | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J9 |
| 1 | W_CT_HWS | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J8 |
| 1 | X Leds Btns | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J11 |
| 1 | X leds btns | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J18 |
| 1 | X9 IN | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J54 |
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Questions
How big is the Plc-4u a PCB?
It measures 363.5 × 84 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Plc-4u a use?
221 parts, built around the ATMEGA16-16PU, MAX485ED, SIM800 and IRF4905. 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 Plc-4u a KiCad files?
From the semicontinuity/embedded repository on GitHub, at the commit this page was made from: the board is target/plc-4u-a/hardware/plc-4u-a/plc-4u-a.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Plc-4u a design in my own project?
Its repository states no licence, so its author keeps all rights: ask semicontinuity before reusing the design.