HardLabs

TOBS

soldesign·TOBS·KiCad documents/HybridChargeController.kicad_pcb

TOBS PCB layout, top view — open source AVR/Arduino board by soldesign

About the TOBS PCB

TOBS is an open source AVR/Arduino PCB design by soldesign, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 87 × 87 mm, with 100 components from 30 distinct parts.

Its main chip is the Uno Layout, from the AVR/Arduino family. Other key parts include the LM358D, bq76920 and cd4051. By type, the board carries 56 resistors, 16 transistors, 11 capacitors, 7 connectors, 5 ICs and 2 fuses.

It belongs with the power & battery and retro computing designs in this gallery.

From the project

Retrofit lifetime enhancement for millions of solar lead-acid batteries in global south countries with cheap IUT-enabled hybrid chargers

Currently, 1.3 billion people live without access to electricity. Most of them are inhabitants of rural regions in developing south, that don’t have connection to the electricity grid. Fortunately, clean energy technologies have been reaching these people more and more in the past years. Mostly, but not only, in Bangladesh, a renewable energy revolution is taking place: the emergence of small scale solar-home-systems that supply electricity for lighting, cellphones and household appliances - in Bangladesh alone, there are already over 5 million solar-home-systems installed! These system…

Main components on the TOBS

LM358Dbq76920cd4051

TOBS bill of materials (BOM)

100 components, 30 distinct parts — part numbers from the project's BOM.

QtyPartRefs
3
LM358D
U1, U4, U5
1
bq76920
U2
1
cd4051
U3
6
MMBT3904
Q1, Q3, Q6, Q7, Q8, Q10
6
IPD90P04P4L-04
Q2, Q4, Q5, Q9, Q11, Q14
2
STL60P4LLF6
Q12, Q13
2
BSS138
Q15, Q16
1
Load
P1
1
LI_balancer
P2
1
PV
P3
1
Extra
P4
1
LI
P5
1
LA
P6
1
FTDI
P7
1
Uno Layout
AU1
2
15A
F1, F2
1
1N4148-T
D2
1
VSB2045Y-M3/54
D3
6
1µ
C1, C2, C3, C4, C6, C7
3
0.1µ
C5, C8, C10
Show 10 more
QtyPartRefs
2
10µ
C9, C11
17
10k
R1, R11, R13, R22, R23, R24, R25, R26 +9
8
100
R2, R3, R4, R5, R6, R10, R14, R18
7
100k
R7, R9, R28, R35, R39, R41, R51
2
33k
R8, R42
5
47k
R12, R30, R37, R50, R52
6
4.7k
R15, R21, R29, R34, R43, R47
4
R005
R16, R17, R32, R44
6
220k
R19, R20, R31, R36, R45, R46
1
2.2k
R40

TOBS design files

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

TOBS: common questions

What microcontroller does the TOBS use?

The TOBS is built around the Uno Layout, from the AVR/Arduino family.

How big is the TOBS PCB?

The TOBS measures 87 × 87 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the TOBS?

100 components, from 30 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 TOBS design files?

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

Can I use the TOBS design in my own project?

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

Can I test firmware for the TOBS 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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