5 open source boards using the Si7021-A20
Real designs built with the Si7021-A20, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
ESP8266Ikea fyrtur
mjuhanne
44.5 × 22.5 mm42 parts4LMIT22
Microchip SAMPine
hutscape
45.7 × 38.1 mm43 parts2LMIT7
STM32Node base
LanternD
78 × 40 mm73 parts2LApache-2.06- schematic only · 42 partsESP32
IoT-project custom-PCB
sumitisme
42 partsNo license2 
ESP32Wroom board
SinaKarvandi
100 × 100 mm59 parts4LGPL-3.01
The Si7021-A20 in open source designs
The gallery holds 5 open source boards using the Si7021-A20 from 5 GitHub repositories; a typical one measures about 61.9 × 39 mm and carries around 43 components.
50% are two-layer designs, the rest use four layers or more, and 80% carry an open source license.
The most starred is Ikea fyrtur by mjuhanne.
Microcontrollers on boards using the Si7021-A20
What boards using the Si7021-A20 are built for
Si7021-A20: common questions
Where can I find a Si7021-A20 reference design?
Each of the 5 boards on this page is a real design using the Si7021-A20. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
Which microcontrollers do boards using the Si7021-A20 use?
Most are built on ESP32 (2), ESP8266 (1), Microchip SAM (1) and STM32 (1).
How big is a typical board using the Si7021-A20?
The median is 61.9 × 39 mm, and 50% are two-layer designs.
What is the most popular open source board using the Si7021-A20?
By GitHub stars, Ikea fyrtur by mjuhanne, with 22 stars.
Can I simulate one of these boards using the Si7021-A20 before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.