2 layers95.8 × 17.8 mm
BivalveBit
millerlp/BivalveBit_hardware
Heart rate and valve gape sensor wearable for oysters and mussels
55 partsGPL-3.0
2 layers89.9 × 17.8 mm
BivalveBit
millerlp/BivalveBit_hardwareHeart rate and valve gape sensor wearable for oysters and mussels
- Size
- 89.9 × 17.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 58
- Nets
- 52
- Pads
- 187
- Tracks, vias
- 660, 91
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 8 Oct 2021
- Updated
- 29 May 2025
Overview
BivalveBit is an open-source printed circuit board by millerlp, from the millerlp/BivalveBit_hardware repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 89.9 × 17.8 mm with 58 parts on 52 nets, routed with 660 tracks and 91 vias.
It is built around the ATMEGA4808-AF, LP5907MFX-3.0 and BSS138, with the MCP79400-I/SN and PTS525SM15SMTR2LFS among its other parts. Its parts include 18 resistors, 10 capacitors, 6 connectors, 3 ICs and 3 transistors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
5
ATMEGA4808-AF
TQFP-32(7x7)-40℃~+125℃ 1.8V~5.5V 10bit 20MHz 256Byte 27 48KB 6KB 8 Bit AVR Built-in FLASH Power-on reset (POR)、Undervoltage detection (BOR/LVD/LVR/LVI)、Built-in general-purpose timer、Hardware CRC、Window watchdog (WWDG) TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
LP5907MFX-3.0
SOT-23-5-40℃~+125℃@(Tj) 1 120mV@(250mA) 12uA 250mA 3V 5.5V 6.5uVrms 82dB@(1kHz) Fixed Over Temperature Protection、Enable、Short Circuit Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
MCP79400-I/SN
SOIC-8-40℃~+85℃ 1.2uA 1.8V~5.5V 925nA External I2C Temperature compensation、Backup power management and battery charging、InsideSRAM/NVRAM、Timestamp function、Programmable clock output、Alarm function、Locking and tamper-proof、ESD/Overvoltage protection Yes SOIC-8 Real Time Clocks ROHSMicrochip TechnologyReal Time Clocks
PTS525SM15SMTR2LFS
SMD-4P,5.2x5.2mm-20℃~+70℃ 1.5mm 1.6N 15V 20mA 5.2mm 5.2mm Gull Wing Round Button SPST Surface Mount,Vertical SMD-4P,5.2x5.2mm Tactile Switches ROHSC&KTactile Switches
README
README.mdBivalveBit hardware
Heart rate and valve gape sensor wearable for oysters and mussels. This hardware is described in the publication "Monitoring bivalve behavior and physiology in the laboratory and field using open-source tools" L.P. Miller (2022) Integrative and Comparative Biology
https://doi.org/10.1093/icb/icac046
- Based around a ATmega4808 microcontroller
- Designed to fit inside a nominal 3/4" schedule 40 PVC plumbing pipe (<18.5mm inside diameter) along with an 18650 size Lithium-Ion battery cell.
- Provides one I2C 4-pin port for communicating with a IR heart rate sensor
- Provides one analog 4-pin port for communicating with an analog sensor such as the A1395 Hall effect sensor (with SLEEP pin on the 4th wire).
- Writes data to a standard microSD card
Parts
58| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R2, R9, R11, R13, R15 |
| 5 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C4, C6, C8 |
| 5 | Conn_01x01_Male | Connector_Pin:Pin_D1.0mm_L10.0mm | J2, J4, J5, J7, J8 |
| 4 | 2.2k | Resistor_SMD:R_0603_1608Metric | R4, R5, R16, R17 |
| 3 | 100k | Resistor_SMD:R_0603_1608Metric | R3, R6, R8 |
| 2 | 100ohm | Resistor_SMD:R_0603_1608Metric | R7, R18 |
| 2 | 1uF | Capacitor_SMD:C_0603_1608Metric | C3, C5 |
| 2 | 4-16pF | Capacitor_SMD:C_0603_1608Metric | C9, C10 |
| 2 | 47k 1% | Resistor_SMD:R_0603_1608Metric | R10, R12 |
| 2 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | Conn_01x04_Male | Connector_JST:JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | HALL_SENSOR1, HEART_SENSOR1 |
| 2 | SolderJumper_3_Bridged12 | Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm | JP1, JP2 |
| 2 | TestPoint_Probe | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP1, TP2 |
| 1 | 0Ω | Resistor_SMD:R_0603_1608Metric | R14 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 47219-2001 | MOLEX_microSD_47219-2001:MOLEX_47219-2001 | microSD1 |
| 1 | ATmega4808-A | Package_QFP:TQFP-32_7x7mm_P0.8mm | U2 |
| 1 | BJT_NPN | Package_TO_SOT_SMD:SOT-23 | U4 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_3000_1x12mm | RTC_BATT1 |
| 1 | Conn_01x02 | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | PRIMARY_BATTERY1 |
| 1 | Conn_01x03_Male | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J6 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | OLED1 |
| 1 | Conn_01x06 | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Horizontal | FTDI1 |
| 1 | GRNLED | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | LP5907MFX-3.0 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | MCP79400 | Package_SO:MSOP-8_3x3mm_P0.65mm | RTC1 |
| 1 | P-FET | Package_TO_SOT_SMD:SOT-23 | Q3 |
| 1 | PTS525SM15SMTR2LFS | Switch_CK_PTS525SM15SMTR2:SW_PTS525SM15SMTR2LFS | RESET1 |
| 1 | REDLED | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | SSP-T7-F | Crystal_Seiko_SSPT:OSC_SSP-T7-F | Crystal_32.768kHz1 |
| 1 | SW_Reed | Button_Switch_SMD:SW_SPST_REED_CT10-XXXX-G1 | SW2 |
| 1 | TC2030-IDC-NL-UPDI | Connector:Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | PROGRAM_HEADER1 |
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Questions
How big is the BivalveBit PCB?
It measures 89.9 × 17.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the BivalveBit use?
58 parts, built around the ATMEGA4808-AF, LP5907MFX-3.0, BSS138 and MCP79400-I/SN. 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 BivalveBit KiCad files?
From the millerlp/BivalveBit_hardware repository on GitHub, at the commit this page was made from: the board is Hardware/BivalveBit_main_board_KiCAD/BivalveBit_RevE/BivalveBit.kicad_pcb and its schematic Hardware/BivalveBit_main_board_KiCAD/BivalveBit_RevE/BivalveBit.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the BivalveBit design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).