HardLabs

Airtap

ajkumar-1907·POWER-ELECTRONICS-LIB·airtap/airtap.kicad_pcb

Airtap PCB layout, top view — open source AVR/Arduino board by ajkumar-1907

About the Airtap PCB

Airtap is an open source AVR/Arduino PCB design by ajkumar-1907, published on GitHub under the MIT license. It is a 2-layer board measuring 50 × 100 mm, with 44 components from 29 distinct parts.

Its main chip is the ATmega328-A, from the AVR/Arduino family. Other key parts include the VL53L0CXV0DH1 and AMS1117-3.3. By type, the board carries 14 resistors, 11 capacitors, 4 diodes, 3 ICs, 3 connectors and 2 transistors.

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

From the project

Open-source library of power electronics converter topologies — KiCad schematics, working principles, use cases, and design notes for DC-DC, AC-DC, DC-AC, and AC-AC converters. Free to use, modify, and build on.

A touchless, proximity-triggered relay controller for 220 V AC loads. Hold your hand 10–30 mm above the sensing area and a VL53L0X time-of-flight sensor detects it. The ATmega328 then toggles an onboard relay to switch a lamp, fan or other mains appliance, with no physical contact.

1. Power: mains enters on J1 (LINE / NEUTRAL) through fuse F1 (0.5 A). MOV RV1 (10D561K) clamps surges, and the HLK-5M05 isolated module produces 5 V. The AMS1117 then makes 3.3 V for the ATmega328 and the VL53L0X. 2. Sensing: the VL53L0X sends out infrared laser pulses and measures their time of flight. The…

Airtap, from the project README
From the project README

Main components on the Airtap

VL53L0CXV0DH1AMS1117-3.3ATmega328-A

Airtap bill of materials (BOM)

44 components, 29 distinct parts.

QtyPartRefs
1
VL53L0CXV0DH1
U1
1
AMS1117-3.3
U2
1
ATmega328-A
U3
2
AO3400A
Q1, Q2
1
8MHz
Y1
1
Screw_Terminal_01x05
J1
1
Conn_02x03_Odd_Even
J2
1
B3B-XH-A
Conn_01x03_Pin
J3
1
0.5A/250Vac
F1
1
G5LE-1
K1
1
MLT-8530
LS1
1
HLK-5M05
PS1
1
10D561K
RV1
1
SW_Push
SW1
1
1N4148W
D1
1
BLUE
D2
1
RED
D3
1
GREEN
D4
1
0.1uF
C1
5
100nF
C2, C5, C7, C10, C11
Show 9 more
QtyPartRefs
1
220uF
C3
1
4.7uF
C4
2
10uF
C6, C9
1
1uF
C8
4
10K
R1, R6, R10, R12
5
4K7
R2, R3, R4, R7, R13
2
1K
R5, R8
2
0R
R9, R11
1
330R
R14

Airtap design files

The KiCad project lives in the ajkumar-1907/POWER-ELECTRONICS-LIB repository on GitHub; these links point at the commit this page was built from.

Airtap: common questions

What microcontroller does the Airtap use?

The Airtap is built around the ATmega328-A, from the AVR/Arduino family.

How big is the Airtap PCB?

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

How many components are on the Airtap?

44 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the Airtap design files?

From the ajkumar-1907/POWER-ELECTRONICS-LIB repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Airtap design in my own project?

Yes, under the terms of its MIT license, which ajkumar-1907 chose for the repository.

Can I test firmware for the Airtap 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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