2 layers99.1 × 99.1 mm
Vent
pandemiaplan/OP-Vent
A Simple, Open-Source Ventilator using a Proportional Solenoid Valve
113 parts5
2 layers25 × 37.3 mm
TheLock schematics
bitraf/toollockEach lock has a key with a matching key pattern. The key is physically attached to the tool using a wire. An optical sensor detects that the right key is used.
- Size
- 25 × 37.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 11
- Pads
- 32
- Tracks, vias
- 65, 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 1 Jul 2017
- Updated
- 19 Feb 2018
Overview
TheLock schematics is an open-source printed circuit board by bitraf, from the bitraf/toollock repository on GitHub. It is a 2-layer board of 25 × 37.3 mm with 14 parts on 11 nets, routed with 65 tracks and 2 vias.
It is built around the PMV20XNER. Its parts include 4 resistors, 4 connectors, 2 diodes and 2 transistors. It belongs with the home automation and IoT boards of this library.
Main components
1README
README.mdTheLock
Electronic lock connected via wireless (Wi-Fi) and MQTT using MsgFlo. The lock is intended to enforce 'checking out' and 'checking in' portable tools in a shared workshop environment.
It makes it possible to:
- Know whether a tool is currently in its station
- Checking for neccesary safety course before allowing usage
- Holding people responsible when equipment is not get returned or broken
Each lock has a key with a matching key pattern. The key is physically attached to the tool using a wire. An optical sensor detects that the right key is used. IR leds normally light through, only a matching key will fully block light.
The key and lock can be CNC-milled, lasercut or 3d-printed.
Status
Proof of concept
- July 2017: Functional prototype was built during 2-day hackathon
- First production version planned for October 2017
Bill of Materials
- Microcontroller - ESP8266 or similar. We used a Wemos D1 board.
- actuator - we used a solenoid that is rated for 12V (it actually actuates at about 7V, but slowly), it draws about 0.3 - 0.7 A. Alternatives: 1 2
- mosfet - we used a IPP055N03L
- resistor - a 10k ohm resistor for pulldown on the control signal
- power supply - a 12V DC power supply for the actuator / solenoid
- IR led 0805, 120deg. Kingbright kp-2012f3c
- IR phototransistor 0805, 120 deg. Kingbright kp-2012p3c
https://wiki.wemos.cc/products:d1:d1_mini https://github.com/esp8266/esp8266-wiki/wiki/Pin-definition
Setup firmware
- Install Arduino libraries PubsubClient and Msgflo
- Setup wifi connection: Add a file
Config.hdefining parametersWIFI_SSIDandWIFI_PASSWORD - Configure MQTT details in the sketch
TODO
v1.0: First fabricated version
- Electronics: Switch to a standard transmissive detector, PCB mounted.
- Mechanics: Update to vertical PCB orientation, check connections
- Produce initial 4 locks
- Mechanics: Add a casing/box for 4-8 locks. Securely wall/table mountable.
License
MIT
Made by
State machine
Electronics
Developed in KiCAD.
Mechanics
Developed in FreeCAD.
SIG: gnd+in PWR: 12v+gnd OUT: 12v+out
IN GND 12v 12v OUT
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 10k | Resistors_SMD:R_1210_HandSoldering | R1 |
| 1 | 18k | Resistors_SMD:R_1210_HandSoldering | R3 |
| 1 | 47 | Resistors_SMD:R_1210_HandSoldering | R2 |
| 1 | CONN_IRBOARD | Socket_Strips:Socket_Strip_Angled_1x02_Pitch2.54mm | J3 |
| 1 | CONN_IRLED | Pin_Headers:Pin_Header_Angled_1x02_Pitch2.54mm | J4 |
| 1 | CONN_POWER | Pin_Headers:Pin_Header_Angled_1x04_Pitch2.54mm | J2 |
| 1 | CONN_SIGNAL | Pin_Headers:Pin_Header_Angled_1x04_Pitch2.54mm | J1 |
| 1 | IR LED | LEDs:LED_0805_HandSoldering | D1 |
| 1 | IR PHOTOTRANS | Diodes_SMD:D_0805 | Q2 |
| 1 | LED | LEDs:LED_1206_HandSoldering | D2 |
| 1 | PMV20XNE | TO_SOT_Packages_SMD:SOT-23W_Handsoldering | Q1 |
| 1 | R | Resistors_SMD:R_1210_HandSoldering | R4 |
The 12 most common of 14 parts.
Questions
How big is the TheLock schematics PCB?
It measures 25 × 37.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the TheLock schematics use?
14 parts, built around the PMV20XNER. 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 TheLock schematics KiCad files?
From the bitraf/toollock repository on GitHub, at the commit this page was made from: the board is TheLock-schematics/TheLock-schematics.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the TheLock schematics design in my own project?
Its repository states no licence, so its author keeps all rights: ask bitraf before reusing the design.
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