HardLabs

Cell

M-o-a-T·moat-hardware·bms/cell/cell.kicad_pcb

Cell PCB layout, top view — open source AVR/Arduino board by M-o-a-T

About the Cell PCB

Cell is an open source AVR/Arduino PCB design by M-o-a-T, published on GitHub. It is a 2-layer board measuring 30 × 53.9 mm, with 36 components from 21 distinct parts.

Its main chip is the ATtiny827-MU, from the AVR/Arduino family. Other key parts include the PC817. By type, the board carries 22 resistors, 3 diodes, 2 ICs, 2 capacitors, 1 transistor and 1 fuse.

It belongs with the power & battery and iot & wireless designs in this gallery.

From the project

Schematics and files for MoaT IoT things

This directory contains schematics etc. pertaining to our BMS.

Instead of isoSPI or similar schemes that require specialized ICs, we use remote-powered digital isolators. This allows us to combine controllers as required.

All modules are connected in a loop. Communication can run both ways. Thus a single interrupted connection or wire will not hurt.

We always connect an OUT plug to an IN plug. Damage will result when two OUT sockets get connected. The same happens with two IN sockets.

Main components on the Cell

PC817ATtiny827-MU

Cell bill of materials (BOM)

36 components, 21 distinct parts.

QtyPartRefs
1
PC817
U1
1
ATtiny827-MU
U2
1
Q_NMOS_20V_4A_lowVth
Q1
3
S2B-PH-K(LF)(SN)
Conn_01x02_Male
EXTTEMP1, RX1, TX1
1
MP005460
F1
1
Conn_01x02_Male
POWER1
1
Conn_01x02_Male
REMOTE1
1
SMBJ6.0CD-M3/H
D2
1
LS R976
D3
1
LED KPTD-2012LVQBC-D
D4
1
CC0805KRX7R9BB104
CP_100n_50V_0603
C1
1
CP_1µ_10V_0603
C2
4
R_10k_0603
R1, R3, R20, R21
3
Rth_10k_SMD
R2, R19, R23
1
0805W8F2200T5E
R_220_0603
R5
9
R_1_2W
R6, R8, R12, R22, R24, R25, R26, R29 +1
1
R_5k1_0603
R14
1
0805W8F1002T5E
R_10k_0603
R15
1
R_2k2_0603
R16
1
0805W8F2201T5E
R_2k2_0603
R17
Show 1 more
QtyPartRefs
1
R_470_0603
R18

Cell design files

The KiCad project lives in the M-o-a-T/moat-hardware repository on GitHub; these links point at the commit this page was built from.

Cell: common questions

What microcontroller does the Cell use?

The Cell is built around the ATtiny827-MU, from the AVR/Arduino family.

How big is the Cell PCB?

The Cell measures 30 × 53.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Cell?

36 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the Cell design files?

From the M-o-a-T/moat-hardware repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Cell design in my own project?

The repository has no license, so all rights stay with M-o-a-T. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Cell 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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