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2 layers6.6 × 15.5 mmMussel heartrate RevC, the printed circuit board in 3D

Mussel heartrate RevC

millerlp/BivalveBit3

BivalveBit firmware

Open in PCBKitView on GitHub.kicad_pcb
Size
6.6 × 15.5 mm
Copper layers
2
Thickness
1.6 mm
Parts
15
Nets
8
Pads
34
Tracks, vias
100, 11
Pours
1
Routed
Yes
KiCad
KiCad 6 (file 20211014)
Created
5 Aug 2021
Updated
8 Oct 2026

Overview

Mussel heartrate RevC is an open-source printed circuit board by millerlp, from the millerlp/BivalveBit repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 6.6 × 15.5 mm with 15 parts on 8 nets, routed with 100 tracks and 11 vias.

It is built around the VCNL4040M3OE. Its parts include 4 resistors and 3 capacitors.

Main components

1

README

README.md

BivalveBit

A custom data logger designed to monitor bivalve mollusc heart rate, valve gape, and external temperature. Designed to be housed in a 3/4" schedule 40 PVC plumbing pipe along with an 18650-size Lithium-Ion battery cell.

Revision E circuit board

Current hardware revision E (Fall 2021). See the Hardware folder for KiCad design files.

Programmed in the Arduino environment.

Requires the separate BivalveBit_lib library available at: https://github.com/millerlp/BivalveBit_lib

Based on ATmega4808 MCU using MegaCoreX board definition https://github.com/MCUdude/MegaCoreX

Parts

15
QtyValueFootprintReferences
4PINHD-1X1SMALLMiller_parts:1X01_SMALL_HEADER_PIN_D0.9MM_W1.4MMGND1, SCL1, SDA1, VDD1
20.1µFMussel_heartrate_RevC:C0402C1, C2
22.2kMussel_heartrate_RevC:R0402R1, R2
222ohmMussel_heartrate_RevC:R0402R3, R4
2PINHD-1X10.7MM_DRILLMiller_parts:1X01_SMALL_0.015IN_0.38MMDRILL/~{INT}1, CATHODE1
12.2uFMussel_heartrate_RevC:C0402C3
1TMP117MAIDRVRMussel_heartrate_RevC:SON65P200X200X80-7NTMP117
1VCNL4040M3OEMussel_heartrate_RevC:VISHAY_VCNL4040_4X2X1.1VCNL4040

Questions

How big is the Mussel heartrate RevC PCB?

It measures 6.6 × 15.5 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Mussel heartrate RevC use?

15 parts, built around the VCNL4040M3OE. 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 Mussel heartrate RevC KiCad files?

From the millerlp/BivalveBit repository on GitHub, at the commit this page was made from: the board is Hardware/Mussel_heartrate_RevC_KiCad/Mussel_heartrate_RevC.kicad_pcb and its schematic Hardware/BivalveBit_RevE/BivalveBit.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Mussel heartrate RevC 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).

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