HardLabs

SmartSupply

ThomasVDD·SmartSupply·PCB/PSU_PCB.kicad_pcb

SmartSupply PCB layout, top view — open source AVR/Arduino board by ThomasVDD

About the SmartSupply PCB

SmartSupply is an open source AVR/Arduino PCB design by ThomasVDD, published on GitHub under the Custom license license. It is a 2-layer board measuring 169.3 × 128 mm, with 131 components from 63 distinct parts.

Its main chip is the ATMEGA328-P, from the AVR/Arduino family. Other key parts include the INA219, BQ2057WSN_SOIC, LM6144, LT3080 and LM7805CT. By type, the board carries 59 resistors, 30 capacitors, 12 ICs, 9 diodes, 8 connectors and 5 switches.

It belongs with the power & battery and test & measurement designs in this gallery.

From the project

SmartSupply is a digital battery powered lab powersupply. It is Arduino compatible and can be controlled via PC over USB.

To understand the operation of the circuit, we will have to look at the schematic. I divided it into functional blocks, such that it is easier to understand; I will thus also explain the operation step by step.

The measurement of the current, and the generation of the signal ADC_Iout is done as follows. The output current flows through resistors R7 - R16. These total 1 ohm; the reason for not using 1R in the first place is twofold: 1 resistor would need to have a higher power rating (it needs to dissipate at least 1 W), and by using 10 1% resistors in parallel, we get a higher precision than…

SmartSupply, from the project README
From the project README

Main components on the SmartSupply

ATMEGA328-PINA219BQ2057WSN_SOICLM6144LT3080LM7805CTLM334LT1370ISL21070FT232RMCP4101074HC595

SmartSupply bill of materials (BOM)

131 components, 63 distinct parts.

QtyPartRefs
1
ATMEGA328-P
IC1
1
INA219
U1
1
BQ2057WSN_SOIC
U2
1
LM6144
U3
1
LT3080
U4
1
LM7805CT
U5
1
LM334
U6
1
LT1370
U7
1
ISL21070
U8
1
FT232R
U9
1
MCP41010
U10
1
74HC595
U11
1
TIP32CG
Q1
2
2N3904
Q2, Q3
1
16Mhz
Y1
1
BARREL_JACK
CON1
1
USB_OTG
P1
1
FTDI
P2
1
V+
P3
1
V-
P4
Show 43 more
QtyPartRefs
1
ISP
P5
1
I2C
P6
1
LCD_Display
P7
2
Battery
BT1, BT2
1
POT
RV1
1
SWITCH
SW1
2
SPST
SW2, SW3
1
Encoder1
SW4
1
Encoder0
SW5
1
Red_Led
D1
1
Red_Led
D2
1
1N5358B
D3
1
SS34
D4
1
Green_Led
D5
2
1N4148
D6, D7
1
SS34
D8
1
1N4007
D9
1
47u
L1
2
100n
C1, C21
10
100n
C2, C3, C5, C6, C7, C9, C10, C22 +2
3
220u
C4, C13, C25
5
22u
C8, C11, C14, C17, C18
4
10n
C12, C15, C16, C24
1
47n
C19
1
4.7n
C20
2
22p
C26, C27
1
22u
C28
1
100u
C30
12
10R
R1, R2, R7, R8, R9, R10, R11, R12 +4
7
10k
R3, R17, R26, R35, R38, R51, R55
1
0.2R
R4
3
6k8
R5, R53, R54
3
1k
R6, R18, R42
3
10k
R19, R20, R37
12
10k 0.1%
R21, R22, R25, R29, R30, R32, R33, R34 +4
7
10k 0.1%
R23, R24, R46, R49, R57, R58, R59
1
680k
R27
1
220k
R28
2
1k
R31, R36
2
100R
R39, R41
3
330R
R40, R52, R56
1
2.2k
R48
1
620R
R50

SmartSupply design files

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

SmartSupply: common questions

What microcontroller does the SmartSupply use?

The SmartSupply is built around the ATMEGA328-P, from the AVR/Arduino family.

How big is the SmartSupply PCB?

The SmartSupply measures 169.3 × 128 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the SmartSupply?

131 components, from 63 distinct parts. The full bill of materials is listed on this page.

Where can I download the SmartSupply design files?

From the ThomasVDD/SmartSupply repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the SmartSupply design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Can I test firmware for the SmartSupply 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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