HardLabs

Dc load

Fyfar·dc_load·kicad/kicad:dc_load.kicad_pcb

Dc load PCB layout, top view — open source ESP32 board by Fyfar

About the Dc load PCB

Dc load is an open source ESP32 PCB design by Fyfar, published on GitHub. It is a 2-layer board measuring 166.4 × 70.3 mm, with 50 components from 32 distinct parts.

Its main chip is the ESP32-C3, from the ESP32 family. Other key parts include the L7805, TL431LP and LM324. By type, the board carries 20 resistors, 10 capacitors, 8 connectors, 4 ICs, 4 diodes and 2 transistors.

It belongs with the iot & wireless, test & measurement and displays & leds designs in this gallery.

From the project

DIY electronic load based on ESP32-C3 with external ADC/DAC, 4-wire measurements, MQTT logging, and KiCad schematics.

This repository contains everything related to my homemade electronic load project. It’s a personal DIY project – not a commercial or professional design. I’m sharing it here mostly to keep things organized and maybe to help someone else who is experimenting with similar ideas.

- 🖥 Firmware (ESP32) Code for controlling the load, written for ESP32-C3 Super Mini. - No delay() calls (uses timers/interrupts instead) - Online logging via MQTT broker 📡 - Current control via external DAC - Calibration and basic measurement support

Main components on the Dc load

L7805ESP32-C3TL431LPLM324

Dc load bill of materials (BOM)

50 components, 32 distinct parts.

QtyPartRefs
1
L7805
U2
1
ESP32-C3
U3
1
TL431LP
U4
1
LM324
U5
2
IRLZ44N
Q2, Q3
1
LCD socket pin
J2
1
Conn_01x02
J3
1
Encoder
J4
1
GPIO expander
J5
1
MCP4725
J6
1
ADS1115 ADC
J7
1
+
J8
1
-
J9
1
5A
F2
1
100k
TH2
2
D_Schottky
D2, D3
1
D
D4
1
1N4007
D5
2
220u
C2, C4
2
0.1u
C3, C6
Show 12 more
QtyPartRefs
2
10u
C5, C8
1
100n
C7
2
200n
C9, C10
1
1n
C11
1
100k
R2
1
200
R3
3
500
R4, R9, R15
4
1k
R5, R8, R11, R14
1
2k
R6
7
10k
R7, R10, R12, R13, R16, R17, R18
2
100
R19, R20
1
0.100
R21

Dc load design files

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

Dc load: common questions

What microcontroller does the Dc load use?

The Dc load is built around the ESP32-C3, from the ESP32 family.

How big is the Dc load PCB?

The Dc load measures 166.4 × 70.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Dc load?

50 components, from 32 distinct parts. The full bill of materials is listed on this page.

Where can I download the Dc load design files?

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

Can I use the Dc load design in my own project?

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

Can I test firmware for the Dc load without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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