HardLabs

RPM-counter

midasgossye·RPM-counter·Electronics/KiCad_files/RPM.kicad_pcb

RPM-counter PCB layout, top view — open source AVR/Arduino board by midasgossye
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About the RPM-counter PCB

RPM-counter is an open source AVR/Arduino PCB design by midasgossye, published on GitHub. It is a 2-layer board measuring 68.9 × 23 mm, with 62 components from 35 distinct parts.

Its main chip is the ATmega328P-AU, from the AVR/Arduino family. Other key parts include the FS312F-G, CH340C, LM393, MT3608 and TP4056. By type, the board carries 19 resistors, 14 capacitors, 8 diodes, 6 ICs, 5 transistors and 4 connectors.

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

From the project

Open-source DIY RPM counter using IR reflectance

This folder contains the schematic, BOM, KiCad files and gerber fabrication files for the PCB.

ATMEGA328P Microcontroller with Arduino bootloader Built-in CH340 based USB Serial Constant current IR LED driver Runs on single-cell LiPo TP4560 based LiPo battery charger LiPo protection circuitry * 3.3 V -> 5 V boost converter

RPM-counter, from the project README
From the project README

Main components on the RPM-counter

FS312F-GCH340CLM393MT3608ATmega328P-AUTP4056

RPM-counter bill of materials (BOM)

62 components, 35 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
FS312F-G
U1
1
CH340C
U2
1
LM393
U3
1
MT3608
U4
1
ATmega328P-AU
U5
1
TP4056
U6
2
SL2302S
Q1, Q2
2
PMBT3904
Q3, Q4
1
DY-PT333-6C
Q5
1
16 MHz
Y1
1
USB_B_Mini
J1
1
LiPo
J2
1
AVR-ISP-6
J3
1
OLED
J4
1
500 mA
F1
1
10k
RV1
2
SPDT
SW2, SW3
1
Rx
D1
1
Tx
D2
3
SS24FL
D3, D4, D5
Show 15 more
QtyPartRefs
1
Green
D6
1
DY-IR333-A
D7
1
Red
D8
1
22u
L1
7
100n
C1, C2, C3, C4, C6, C7, C14
5
22u
C5, C8, C11, C12, C13
2
22p
C9, C10
1
100
R1
8
1k
R2, R3, R4, R6, R9, R15, R16, R17
4
10k
R5, R7, R8, R10
1
36k
R11
1
4.7k
R12
1
2k2
R13
1
39R
R14
2
R
R18, R19

RPM-counter design files

The KiCad project lives in the midasgossye/RPM-counter repository on GitHub; these links point at the commit this page was built from.

RPM-counter: common questions

What microcontroller does the RPM-counter use?

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

How big is the RPM-counter PCB?

The RPM-counter measures 68.9 × 23 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RPM-counter?

62 components, from 35 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 RPM-counter design files?

From the midasgossye/RPM-counter repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the RPM-counter design in my own project?

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

Can I test firmware for the RPM-counter 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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