HardLabs

Gatekeeper

Ingimarsson·gatekeeper·hardware/GK-400-v1/pcb/Gatekeeper PCB.kicad_pcb

Gatekeeper PCB layout, top view — open source AVR/Arduino board by Ingimarsson

About the Gatekeeper PCB

Gatekeeper is an open source AVR/Arduino PCB design by Ingimarsson, published on GitHub under the MIT license. It is a 2-layer board measuring 100 × 100 mm, with 61 components from 37 distinct parts.

Its main chip is the ATmega328P-AU, from the AVR/Arduino family. Other key parts include the LMR16006YQ. By type, the board carries 17 resistors, 12 connectors, 11 diodes, 7 capacitors, 4 transistors and 2 ICs.

From the project

Access control and monitoring system for electric door locks and automatic traffic barriers.

- Install Arduino IDE - Install libraries Ethernet2 and Wiegand (see zips in lib folder) - Write "ArduinoISP" program from examples to an Arduino Nano (we will use as a programmer) - Select programmer "Arduino as ISP" in IDE menu - Connect Arduino Nano to ISP pins on device, all pins are same but D10 (nano) to reset (device) - Arduino Nano reset must be pulled to ground when programming starts, and released after first timeout

Main components on the Gatekeeper

LMR16006YQATmega328P-AU

Gatekeeper bill of materials (BOM)

61 components, 37 distinct parts.

QtyPartRefs
1
LMR16006YQ
U1
1
ATmega328P-AU
U2
4
2N2222A
Q1, Q2, Q3, Q4
1
16MHz
Y2
1
RELAY1
J1
1
230VAC IN
J2
1
12VDC OUT
J3
1
Inputs
J4
1
EXT RLY
J5
1
ICSP
J6
1
Serial
J8
1
W5500 Shield
J10
1
WIEGAND
J11
1
RELAY2
J12
1
RELAY3
J13
1
RELAY4
J14
1
IRM-10-12
PS1
4
G5LE-14_DC5
RLY1, RLY2, RLY3, RLY4
1
Reset
SW1
1
RELAY1
D1
Show 17 more
QtyPartRefs
1
MBR130T1G
D2
1
12V
D3
1
RELAY2
D4
1
RELAY3
D5
1
RELAY4
D6
4
S1G
D7, D8, D9, D10
1
5V
D11
1
22uH
L1
1
2.2uF 25V
C1
3
100nF
C2, C4, C5
1
10uF
C3
2
22pF
C6, C7
1
54.9k
R1
1
10k
R2
9
1k
R3, R4, R5, R8, R9, R11, R12, R17 +1
1
560
R6
5
150
R7, R10, R13, R14, R15

Gatekeeper design files

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

Gatekeeper: common questions

What microcontroller does the Gatekeeper use?

The Gatekeeper is built around the ATmega328P-AU, from the AVR/Arduino family.

How big is the Gatekeeper PCB?

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

How many components are on the Gatekeeper?

61 components, from 37 distinct parts. The full bill of materials is listed on this page.

Where can I download the Gatekeeper design files?

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

Can I use the Gatekeeper design in my own project?

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

Can I test firmware for the Gatekeeper 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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