HardLabs

Lunar Writer

IlyaBOT·LunarView3·Lunar-Writer/Lunar_Writer.kicad_pcb

Lunar Writer PCB layout, top view — open source AVR/Arduino board by IlyaBOT

About the Lunar Writer PCB

Lunar Writer is an open source AVR/Arduino PCB design by IlyaBOT, published on GitHub. It is a 2-layer board measuring 150 × 105 mm, with 158 components from 86 distinct parts.

Its main chip is the ATMEGA328P-AU, from the AVR/Arduino family. Other key parts include the 74HC595D, CH340C, NM27C512Q SOCKET, LM317T: calibrate 6.250 V and 74LVC1G08 / pulse interlock. By type, the board carries 61 resistors, 31 diodes, 31 capacitors, 13 ICs, 7 transistors and 5 connectors.

From the project

Отдельная двухслойная плата программатора параллельных EPROM, 150×105 мм. USB и CH340 расположены слева, ATmega328P — в центре, регистры адреса и DIP-28 — справа; дополнительная силовая часть находится снизу. Питание программирования подключается к винтовой клемме J4, 12–24 В DC.

Отдельная двухслойная плата программатора параллельных EPROM, 150×105 мм. USB и CH340 расположены слева, ATmega328P — в центре, регистры адреса и DIP-28 — справа; дополнительная силовая часть находится снизу. Питание программирования подключается к винтовой клемме J4, 12–24 В DC. USB отдельно питает логику напряжением 5 В. Земля общая.

- Проект KiCad, схема, разведённая плата. - PDF схемы, 13 листов, PDF медных слоёв и монтажа. - Вид сверху, 3D-превью. - BOM.csv, Gerber и сверловка, карта переходных отверстий. - ERC, DRC с проверкой соответствия схеме, аудит платы, расчёты питания.

Main components on the Lunar Writer

ATMEGA328P-AU74HC595DCH340CNM27C512Q SOCKETLM317T: calibrate 6.250 V74LVC1G08 / pulse interlockSN74HCT245DW74LVC1G08 / arm interlockLM2577T-ADJ / 40V input, 60V switchLM317T / 12.75V / heatsinkLM317T / 21...25V / heatsink

Lunar Writer bill of materials (BOM)

158 components, 86 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA328P-AU
ATmega328P-AU
U1
3
74HC595D
U2, U3, U4
1
CH340C
U5
1
NM27C512Q SOCKET
U6
1
LM317T: calibrate 6.250 V
U7
1
74LVC1G08 / pulse interlock
U8
1
SN74HCT245DW
U9
1
74LVC1G08 / arm interlock
U10
1
LM2577T-ADJ / 40V input, 60V switch
U11
1
LM317T / 12.75V / heatsink
U12
1
LM317T / 21...25V / heatsink
U13
2
MMBT3906
Q1, Q2
1
IRF9540N / 100V PMOS
Q3
2
MMBT5551 / 160V NPN
Q4, Q6
1
MMBT3904
Q5
1
MMBT5401 / 150V PNP
Q7
1
16MHz, CL ~18pF
Y1
1
USB Micro-B
J1
1
AVR ISP
J2
1
UART (MCU RX/TX)
J3
Show 66 more
QtyPartRefs
1
12-24V DC IN (+ / GND)
J4
1
J_TARGET / 40-pin
J5
1
500mA hold
F1
1
MF-R090 / 0.9A hold / 60V
F2
1
VPP SELECT: 12.75 / common / HIGH
JP1
1
G5V-2-DC5 (100mA coil)
K1
1
100R multi-turn
RV1
1
200R multi-turn
RV2
1
1k multi-turn
RV3
1
RESET
SW1
1
RGB CA / 5050 OR THT5
D2
1
RX BLUE
D3
1
TX ORANGE
D4
1
BZT52C10 / 10V
D5
1
VPP ACTIVE RED
D6
1
1N4007 output protection
D7
1
1N4148WS flyback
D8
1
BAT54WS RESET clamp
D9
16
BAT54S
D10, D11, D12, D13, D14, D15, D16, D17 +8
1
ADC6 BAT54S clamp
D30
1
ADC7 BAT54S clamp
D31
1
SS36 / 3A / 60V reverse-polarity
D40
1
SMBJ24A / TVS
D41
1
SS36 / 3A / 60V boost rectifier
D42
2
M7 / 1N4007-SMD / 1A 1000V
D43, D44
1
100uH / SRR1210A-101M / Isat 2.2A
L1
1
10uF / 10V
C1
12
100NF
100nF
C2, C3, C4, C5, C6, C7, C8, C10 +4
1
100nF / 16V
C9
2
22PF
22pF
C11, C12
1
100nF auto-reset
C13
1
10uF / 16V
C15
3
100nF / 50V
C20, C23, C28
2
10NF
10nF
C22, C25
1
10uF / 16V
C24
1
220uF / 50V low ESR
C30
2
100nF / 50V X7R
C31, C33
1
680uF / 50V low ESR
C32
1
47uF / 16V compensation
C34
2
1uF / 50V X7R
C35, C36
6
10K
10k
R1, R23, R24, R43, R44, R65
1
10k CE pull-up
R2
1
10k OE pull-up
R3
25
1k
R4, R5, R10, R11, R12, R13, R14, R15 +17
1
10k LATCH pull-down
R7
1
10k PGM pull-up
R8
1
47k gate-source
R30
2
2.2k / 0.5W
R31, R63
1
10k base pull-down
R33
1
10k VPP_EN pull-down
R34
1
120k / 1%
R35
1
22k / 1%
R36
1
10k bleed / 0.25W
R37
2
5.1K
5.1k
R38, R39
3
120R / 1%
R40, R73, R75
1
430R / 1%
R41
1
470R relay drive
R42
2
10k / 1%
R45, R46
1
10k arm pull-down
R60
2
100k bleed
R61, R77
1
10k base-emitter
R62
1
47k / 1%
R70
1
2k / 1%
R71
1
470R compensation
R72
1
1k / 1%
R74
1
1.8k / 1%
R76

Lunar Writer design files

The KiCad project lives in the IlyaBOT/LunarView3 repository on GitHub; these links point at the commit this page was built from.

Lunar Writer: common questions

What microcontroller does the Lunar Writer use?

The Lunar Writer is built around the ATMEGA328P-AU, from the AVR/Arduino family.

How big is the Lunar Writer PCB?

The Lunar Writer measures 150 × 105 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Lunar Writer?

158 components, from 86 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Lunar Writer design files?

From the IlyaBOT/LunarView3 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Lunar Writer design in my own project?

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

Can I test firmware for the Lunar Writer 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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