HardLabs

ActiveLoad

ahessling·ActiveLoad·Hardware/Schematic/ActiveLoad.kicad_pcb

ActiveLoad PCB layout, top view — open source STM32 board by ahessling

About the ActiveLoad PCB

ActiveLoad is an open source STM32 PCB design by ahessling, published on GitHub under the MIT license. It is a 2-layer board measuring 50 × 100 mm, with 75 components from 43 distinct parts.

Its main chip is the STM32F072C8, from the STM32 family. Other key parts include the MAX3207E, DS18B20, MCP6002, LM317AEMP and LM9036M-3.3. By type, the board carries 28 resistors, 26 capacitors, 6 ICs, 3 connectors, 3 inductors and 2 switches.

From the project

Small 12 Watt Active Load (dummy load) with STM32 microcontroller

Features: Power supply from around 3.3V to 40V Should be powered by device under test Alternative power supply via USB Maximum dissipated power: Around 12W permanently at room temperature Maximum current: 3A Robust (protected from overvoltage, overcurrent and overtemperature conditions) Device under test should be connected via banana plugs or screw terminals A PC should be able to monitor the actual current and control the desired current via USB Small display to monitor actual and setpoint current Rotary encoder to change setpoint current Small (5×10 cm) Measure temperature at heatsink

ActiveLoad, from the project README
From the project README

Main components on the ActiveLoad

MAX3207ESTM32F072C8DS18B20MCP6002LM317AEMPLM9036M-3.3

ActiveLoad bill of materials (BOM)

75 components, 43 distinct parts.

QtyPartRefs
1
MAX3207E
U1
1
STM32F072C8
U2
1
DS18B20
U3
1
MCP6002
U4
1
LM317AEMP
U5
1
LM9036M-3.3
U6
1
BTS117
Q1
1
CSTCE8M00G15
X1
1
USB_OTG
P1
1
Banana jacks
P2
1
AKL 101-2
P3
1
ALPS-STEC12E08
ENC1
1
SK 129-50 STS
HS1
1
EA-DOGS104-A
LCD1
1
FSMSM
SW1
1
ESP4020
SW2
1
Run LED green
D1
1
BAS40
D2
3
BLM21PG331
FB1, FB2, FB3
1
4n7/50V
C1
Show 23 more
QtyPartRefs
2
10n
C2, C4
11
100n
C3, C9, C10, C11, C12, C13, C15, C16 +3
2
DNF
C5, C7
3
4u7
C6, C8, C19
3
1u
C14, C23, C24
1
4u7/50V
C17
2
100n/50V
C22, C26
1
47u/16V
C25
1
1M
R1
6
10k
R2, R3, R4, R7, R15, R21
2
DNF
R5, R6
3
2k
R8, R11, R12
1
1k
R9
1
18k
R10
5
0
R13, R23, R24, R25, R26
1
100
R14
1
390
R16
2
100m
R17, R20
1
240
R18
1
100m
R19
1
220
R22
1
56k
R27
1
4k7
R28

ActiveLoad design files

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

ActiveLoad: common questions

What microcontroller does the ActiveLoad use?

The ActiveLoad is built around the STM32F072C8, from the STM32 family.

How big is the ActiveLoad PCB?

The ActiveLoad measures 50 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ActiveLoad?

75 components, from 43 distinct parts. The full bill of materials is listed on this page.

Where can I download the ActiveLoad design files?

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

Can I use the ActiveLoad design in my own project?

Yes, under the terms of its MIT license, which ahessling chose for the repository.

Can I test firmware for the ActiveLoad without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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