4 layers46.8 × 34.8 mm
SmartWatch V4
Bellafaire/ESP32-Smart-Watch
An open source smartwatch based on the ESP32 compatible with the Arduino IDE.
74 parts258MIT
2 layers75 × 40.5 mm
Pro micro plc
jblb/micro_pro_plcArduino Micro pro PLC board
- Size
- 75 × 40.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 42
- Nets
- 42
- Pads
- 128
- Tracks, vias
- 186, 32
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 6 Sep 2024
- Updated
- 9 Sep 2024
Overview
Pro micro plc is an open-source printed circuit board by jblb, from the jblb/micro_pro_plc repository on GitHub. It is a 2-layer board of 75 × 40.5 mm with 42 parts on 42 nets, routed with 186 tracks and 32 vias.
It is built around the MAX485ED and 2N7002K. Its parts include 15 resistors, 7 connectors, 6 ICs, 4 diodes and 4 transistors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2README
README.mdA 4 inputs 4 outputs PLC board based on Arduino micro pro (or clone) to drive a 4 Way relay board and made to run with open_PLC
Status:
work in progress...
Micro pro PLC is a small Programable Logic Controlor board based on Arduino micro pro (ATmega32U4 microcontroler). It is designed for small systems with 4 digital inputs, 4 digital outputs, 2 analog inputs and a Modbus/RS485 access. It is designed to fit on easy available 4 way relay board
I first designed it for use with open_PLC but it can be use with Arduino IDE or any other way you want to devellop the software you put on the controler
Simulated 3D view
Connection diagram
Arduino pins used
| Board pin | Arduino pin |
|---|---|
| I0.0 | D2 |
| I0.1 | D3 |
| I0.2 | D4 |
| I0.3 | D5 |
| Output0 | D7 |
| Output1 | D8 |
| Output2 | D14 |
| Output3 | D15 |
| IW0.0 | A0 |
| IW0.1 | A1 |
- Modbus/RS485 drived by D1 for Tx and D0 for RX (Serial1)
- RS485 is enabled by D6
- Outputs open drain - 200mA drain output
- Input actived by pooling to GND (need to drain ~20mA)
Schematic
PDF version available here
BOM
| Reference | Value | Footprint |
|---|---|---|
| C1,C2,C3 | 100nF | SMD 0805 |
| D1,D2,D3,D4 | LED_3mm | |
| J1 | 01x06_Pin | PinSocket_2.54mm |
| J2,J3,J4 | TerminalBlock_Phoenix_MKDS 5.00mm | |
| J5 | 01x02_Pin | PinHeader_2.54mm |
| J6,J7 | 01x04_Pin | PinHeader_2.54mm or JST HX |
| Q1,Q2,Q3,Q4 | 2N7002K | SOT-23 |
| R1,R2,R3,R4 | 10k | SMD 0805 |
| R5,R6,R7,R8 | 4k7 | SMD 0805 |
| R9 | 120 | SMD 0805 |
| R10,R11,R12,R13 | 100 | SMD 0805 |
| R14,R15 | 20k | SMD 0805 |
| U1 | Sparkfun_Pro_Micro or Clone | |
| U2,U3,U4,U5 | PC817 | DIP4 |
| U6 | MAX485E | DIP8 |
also available here
Parts
42| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10, R11, R12, R13 |
| 4 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4 |
| 4 | 2N7002K | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q1, Q2, Q3, Q4 |
| 4 | 4k7 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R6, R7, R8 |
| 4 | LED_3mm | LED_THT:LED_D3.0mm | D1, D2, D3, D4 |
| 4 | PC817 | Package_DIP:DIP-4_W7.62mm | U2, U3, U4, U5 |
| 3 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3 |
| 3 | Conn_01x02_Socket | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J2, J3, J4 |
| 2 | 20k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R14, R15 |
| 2 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J6, J7 |
| 1 | 120 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | Conn_01x06_Pin | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J1 |
| 1 | MAX485E | Package_DIP:DIP-8_W7.62mm | U6 |
| 1 | Sparkfun_Pro_Micro | Arduino:Sparkfun_Pro_Micro | U1 |
The 39 most common of 42 parts.
Questions
How big is the Pro micro plc PCB?
It measures 75 × 40.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pro micro plc use?
42 parts, built around the MAX485ED and 2N7002K. 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 Pro micro plc KiCad files?
From the jblb/micro_pro_plc repository on GitHub, at the commit this page was made from: the board is pro_micro_plc.kicad_pcb and its schematic pro_micro_plc.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pro micro plc design in my own project?
Its repository states no licence, so its author keeps all rights: ask jblb before reusing the design.
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