HardLabs

BivalveBit RevA

millerlp·BivalveBit_hardware·Hardware/BivalveBit_main_board_KiCAD/BivalveBit_RevA/BivalveBit_RevA.kicad_pcb

BivalveBit RevA PCB layout, top view — open source AVR/Arduino board by millerlp

About the BivalveBit RevA PCB

BivalveBit RevA is an open source AVR/Arduino PCB design by millerlp, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 102.7 × 17.8 mm, with 48 components from 24 distinct parts.

Its main chip is the ATMEGA4808, from the AVR/Arduino family. Other key parts include the PCF8523TS, LP5907 and FMMT619TA. By type, the board carries 17 resistors, 8 connectors, 8 capacitors, 4 ICs, 3 transistors and 1 switch.

It belongs with the wearables and sensors designs in this gallery.

From the project

Heart rate and valve gape sensor wearable for oysters and mussels

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

BivalveBit RevA, from the project README
From the project README

Main components on the BivalveBit RevA

PCF8523TSATMEGA4808LP5907FMMT619TA

BivalveBit RevA bill of materials (BOM)

48 components, 24 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
PCF8523TS
U1
1
ATMEGA4808
ATmega4808
U2
1
LP5907
U3
1
FMMT619TA
U4
2
BSS138
Q1, Q2
1
IRLML5203
IRLML5203 or BH203,215
Q3
1
CONN_01X02_MALE
Conn_01x02_Male
J1
6
CONN_01X01_MALE
Conn_01x01_Male
J2, J3, J4, J5, J7, J8
1
CONN_01X03_MALE
Conn_01x03_Male
J6
1
SSP-T7-F
32.768kHz
2
Conn_01x04_Male
HALL_SENSOR1, HEART_SENSOR1
1
CONN_01X04
Conn_01x04
OLED1
1
Conn_01x02
PRIMARY_BATTERY1
1
Battery_Cell
RTC_BATT1
1
SW_Reed
SW2
1
LED
D1
5
0.1UF
0.1uF
C1, C2, C4, C6, C8
2
1UF
1uF
C3, C5
1
10UF
10uF
C7
7
10K
10k
R1, R2, R9, R11, R13, R14, R15
Show 4 more
QtyPartRefs
3
100K
100k
R3, R6, R8
4
2.2K
2.2k
R4, R5, R16, R17
1
100OHM
100ohm
R7
2
47k 1%
R10, R12

BivalveBit RevA design files

The KiCad project lives in the millerlp/BivalveBit_hardware repository on GitHub; these links point at the commit this page was built from.

BivalveBit RevA: common questions

What microcontroller does the BivalveBit RevA use?

The BivalveBit RevA is built around the ATMEGA4808, from the AVR/Arduino family.

How big is the BivalveBit RevA PCB?

The BivalveBit RevA measures 102.7 × 17.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the BivalveBit RevA?

48 components, from 24 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the BivalveBit RevA design files?

From the millerlp/BivalveBit_hardware repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the BivalveBit RevA design in my own project?

Yes, under the terms of its GPL-3.0 license, which millerlp chose for the repository.

Can I test firmware for the BivalveBit RevA without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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