HardLabs

BivalveBit

millerlp·BivalveBit·Hardware/BivalveBit_RevE/BivalveBit.kicad_pcb

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

About the BivalveBit PCB

BivalveBit 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 89.9 × 17.8 mm, with 53 components from 29 distinct parts.

Its main chip is the ATMEGA4808-A, from the AVR/Arduino family. Other key parts include the LP5907MFX-3.0 and BJT_NPN. By type, the board carries 18 resistors, 10 capacitors, 6 connectors, 3 ICs, 3 transistors and 2 diodes.

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

From the project

BivalveBit firmware

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

Main components on the BivalveBit

ATMEGA4808-ALP5907MFX-3.0BJT_NPN

BivalveBit bill of materials (BOM)

53 components, 29 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA4808-A
ATmega4808-A
U2
1
LP5907MFX-3.0
U3
1
BJT_NPN
U4
2
BSS138
Q1, Q2
1
P-FET
Q3
5
Conn_01x01_Male
J2, J4, J5, J7, J8
1
Conn_01x03_Male
J6
1
SSP-T7-F
Crystal_32.768kHz1
1
CONN_01X06
Conn_01x06
FTDI1
2
Conn_01x04_Male
HALL_SENSOR1, HEART_SENSOR1
1
CONN_01X04
Conn_01x04
OLED1
1
Conn_01x02
PRIMARY_BATTERY1
1
PTS525SM15SMTR2LFS
RESET1
1
MCP79400
RTC1
1
Battery_Cell
RTC_BATT1
1
SW_Reed
SW2
1
47219-2001
microSD1
1
GRNLED
D1
1
REDLED
D2
5
0.1UF
0.1uF
C1, C2, C4, C6, C8
Show 9 more
QtyPartRefs
2
1UF
1uF
C3, C5
1
10UF
10uF
C7
2
4-16PF
4-16pF
C9, C10
6
10K
10k
R1, R2, R9, R11, R13, R15
3
100K
100k
R3, R6, R8
4
2.2K
2.2k
R4, R5, R16, R17
2
100OHM
100ohm
R7, R18
2
47k 1%
R10, R12
1
0Ω
R14

BivalveBit design files

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

BivalveBit: common questions

What microcontroller does the BivalveBit use?

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

How big is the BivalveBit PCB?

The BivalveBit measures 89.9 × 17.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the BivalveBit?

53 components, from 29 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 design files?

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

Can I use the BivalveBit 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 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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