2 layers73.1 × 58.9 mm
ESP32CanBoard
ieb/CanDiagnose
Small firmware to run on an ESP32 and diagnose devices and messages on a canbus.
35 parts5
2 layers115 × 45 mm
OpenBilgeAlarm
Miceuz/OpenBilgeAlarmAn open source bilge water level alarm system
- Size
- 115 × 45 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 59
- Nets
- 63
- Pads
- 198
- Tracks, vias
- 93, 5
- Routed
- Yes
- KiCad
- KiCad 5 (file 20170123)
- Created
- 10 Apr 2017
- Updated
- 19 Apr 2017
Overview
OpenBilgeAlarm is an open-source printed circuit board by Miceuz, from the Miceuz/OpenBilgeAlarm repository on GitHub, published under the Apache-2.0 licence. It is a 2-layer board of 115 × 45 mm with 59 parts on 63 nets, routed with 93 tracks and 5 vias.
It is built around the SP3481CN-L, 74HC595 and LM7805CT. Its parts include 19 resistors, 10 capacitors, 10 diodes, 4 transistors and 3 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
3
SP3481CN-L
-Enable/shutdown function、Fail-safe - RS-485 / RS-422 ICs ROHSSIPEXInterface - Specialized
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
LM7805CT
TO-2200℃~+70℃@(Ta) 1 1A 20V 2V@(1A) 40uV 5V 62dB@(120Hz) 8mA Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdOpenBilgeAlarm
An open source bilge water level alarm system
Requirements
It is important to comply with the regulations in SOLAS (International Convention for the Safety of Life at Sea), which means:
- visual and audible alarm if bilges submerge with water
- permanent check of the whole system and alert if sensor or wiring fails
Environment
The system will work under moist conditions. The microcontroller can be located in the navigation room. Simple protection against dust and moisture will be sufficient. It is a dry and warm space. No need for any special casing. I would try to make it as a panel to be integrated into the board of all the other technical devices there. Ambient T is 10°C to 30°C. Humidity is rather high. Shock is low but may occur if some part may break and move inside the bilge (that is why I suggest having a cage around the sensor. i'll try to make a sketch or picture). Corrosion is high.
Wiring
For our ship. I would count 35-40 meters of the bus backbone to the furthest sensor. From the backbone each sensor will need about 6-8 meters of cable. We have a cable channel along the side wall of the ship, where it will run along. Since the deepest parts of the sections will always be near the section walls, the backbone will be intersected there with the T-connectors. So the furthest sensor should have something like 45m cable at max.
Power
The ship runs on 24V DC batteries, which are charged and maintained externally. There is also a 220V AC inverter, but I prefer using the 24V DC and have a little converter for our needs. The maximum voltage we may have to consider is 29V in cases of charging with the generator. The minimum can get as low as 22.5V in case we are running really low on voltage.
But having a backup-battery will be a good idea anyways in case anything goes wrong with the other supplies?
System architecture
- A network of sensors is deployed on RS485 transport
- RS485-based soil moisture sensor is used
- Central control system with user interface
User interface
- 2x16 character LCD
- Rotary encoder w push button
- Bright red alarm led
- Multicolor status led
- Buzzer
- "Silence" button
Parts
59| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 330 | Resistors_SMD:R_0603_HandSoldering | R2, R4, R10, R12, R16, R17, R18, R19 |
| 6 | 100k | Resistors_SMD:R_0603_HandSoldering | R3, R5, R7, R9, R13, R14 |
| 6 | C | Capacitors_SMD:C_0603_HandSoldering | C5, C6, C7, C8, C9, C10 |
| 5 | D_TVS | Diodes_SMD:SOD-323 | D2, D7, D8, D9, D10 |
| 4 | Mounting_Hole | Mounting_Holes:MountingHole_3.2mm_M3 | MK1, MK2, MK3, MK4 |
| 3 | 1k | Resistors_SMD:R_0603_HandSoldering | R8, R11, R15 |
| 2 | 1u | Capacitors_SMD:C_1210_HandSoldering | C1, C4 |
| 2 | CP | Capacitors_ThroughHole:CP_Radial_D5.0mm_P2.50mm | C2, C3 |
| 2 | Q_NMOS_GSD | TO_SOT_Packages_SMD:SOT-23_Handsoldering | Q1, Q4 |
| 1 | 10R | Resistors_SMD:R_2512 | R1 |
| 1 | 10k | Resistors_SMD:R_0603_HandSoldering | R6 |
| 1 | 16V | Diodes_SMD:D_SOD-323_HandSoldering | D4 |
| 1 | 24V | Diodes_SMD:Diode-SMA_Handsoldering | D3 |
| 1 | 48V | Diodes_SMD:Diode-SMB_Handsoldering | D1 |
| 1 | 74HC595 | Housings_SOIC:SOIC-16_3.9x9.9mm_Pitch1.27mm | U1 |
| 1 | ARDUINO_NANO | SHIELD_ARDUINO:ARDUINO_NANO_2_CONTOUR_ELL | SH1 |
| 1 | CONN_01X02 | smalsiukas-footpints:TerminalBlock_5.08-2pol | J1 |
| 1 | CONN_01X04 | smalsiukas-footpints:TerminalBlock_5.08-5pol | J2 |
| 1 | LCD16X2 | Displays:WC1602A | DS1 |
| 1 | LED | LEDs:LED_D5.0mm | D6 |
| 1 | LED_ARGB | LEDs:LED_D5.0mm-4 | D5 |
| 1 | LM7805CT | TO_SOT_Packages_THT:TO-220_Vertical | U2 |
| 1 | POT | Potentiometers:Potentiometer_Trimmer_ACP_CA6v_Horizontal | RV1 |
| 1 | Polyfuse | Resistors_THT:R_Box_L8.4mm_W2.5mm_P5.08mm | F1 |
| 1 | Q | TO_SOT_Packages_SMD:TO-252-2Lead | Q3 |
| 1 | Q_PMOS_GSD | TO_SOT_Packages_SMD:SOT-23_Handsoldering | Q2 |
| 1 | Rotary_Encoder_Switch | bilge-alarm-parts:Encoder_Bourns_PEC12R-4xxxF-Sxxxx | SW1 |
| 1 | SP3481CN | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | U3 |
| 1 | SW_SPST | Buttons_Switches_SMD:SW_SPST_EVPBF | SW2 |
| 1 | Speaker_Crystal | Buzzer_12x9.5RM7.6 | LS1 |
Similar boards
- 2 layers99.7 × 50.2 mm
- 2 layers29.4 × 11.2 mm
- 2 layers91.4 × 91.4 mm
- 2 layers47.8 × 27.6 mm
- 2 layers169.3 × 128 mm
PSU PCB
ThomasVDD/SmartSupply
SmartSupply is a digital battery powered lab powersupply. It is Arduino compatible and can be controlled via PC over USB.
134 parts96 - 2 layers99.1 × 56.5 mm
- 2 layers173 × 85 mm
Audio board
EleonoreMizo/pedalevite
Pédale Vite — DIY multi-FX pedalboard for guitar/bass/etc.
268 parts101WTFPL
Questions
How big is the OpenBilgeAlarm PCB?
It measures 115 × 45 mm and has 2 copper layers, 1.6 mm thick.
What parts does the OpenBilgeAlarm use?
59 parts, built around the SP3481CN-L, 74HC595 and LM7805CT. 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 OpenBilgeAlarm KiCad files?
From the Miceuz/OpenBilgeAlarm repository on GitHub, at the commit this page was made from: the board is OpenBilgeAlarm.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the OpenBilgeAlarm design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).