HardLabs

Gear shifter

ManchesterStingerMotorsports·gear-shifter·hardware/Shifter.kicad_pcb

Gear shifter PCB layout, top view — open source ESP32 board by ManchesterStingerMotorsports

About the Gear shifter PCB

Gear shifter is an open source ESP32 PCB design by ManchesterStingerMotorsports, published on GitHub. It is a 4-layer board measuring 78 × 58 mm, with 53 components from 30 distinct parts.

Its main chip is the ESP32-S3-WROOM-1U-N4R2, from the ESP32 family. Other key parts include the LMR50410Y3FQDBVRQ1, MAX3390EEUD_T, ISO1042BQDWVQ1 and TLV1704. By type, the board carries 19 resistors, 13 capacitors, 9 connectors, 6 ICs, 4 diodes and 1 transistor.

From the project

Self-developed Gear Shifter System.

ESP-IDF firmware and bench-test projects for the Manchester Stinger Motorsports electronic gear shifter controller.

The repository now contains four standalone ESP32-S3 projects:

There is intentionally no ESP-IDF project at the repository root. Open/build one of the firmware folders directly.

- starts the shifter task and a placeholder CAN task - reads shift inputs from GPIO - rejects shifts that would leave the valid gear range - uses the latest CAN task output during pre-check: neutral position sensor first, then ECU gear when the car is moving - checks the encoder before commanding the…

Main components on the Gear shifter

ESP32-S3-WROOM-1U-N4R2LMR50410Y3FQDBVRQ1MAX3390EEUD_TISO1042BQDWVQ1TLV1704

Gear shifter bill of materials (BOM)

53 components, 30 distinct parts.

QtyPartRefs
1
ESP32-S3-WROOM-1U-N4R2
U1
1
LMR50410Y3FQDBVRQ1
U2
1
MAX3390EEUD_T
U3
1
ISO1042BQDWVQ1
U4
2
TLV1704
U5, U6
1
BSS205N
Q1
1
RST
J1
1
BSEL
J2
3
S03B-XASK-1
J3, J5, J7
3
SO4B-XASK-1
J4, J6, J8
1
Conn_01x02
J9
2
AP2012EC
RED LED
D1, D4
1
APT2012PGW
GREEN LED
D2
1
LTST-C170TBKT
BLUE LED
D3
1
2.2u
L1
2
1u
C1, C5
2
10u
C2, C18
5
0.1u
C3, C4, C6, C7, C8
1
4.7u
C9
1
2.2u
C15
Show 10 more
QtyPartRefs
2
100n
C16, C17
2
27
R1, R2
6
10k
R3, R8, R12, R16, R25, R27
2
RC0805FR-07270RL
270R
R4, R10
2
5k1
R5, R7
1
RC0805FR-07220RL
220R
R11
1
RC0805FR-07100RL
100R
R13
3
180
R21, R22, R23
1
5k6
R24
1
12k
R26

Gear shifter design files

The KiCad project lives in the ManchesterStingerMotorsports/gear-shifter repository on GitHub; these links point at the commit this page was built from.

Gear shifter: common questions

What microcontroller does the Gear shifter use?

The Gear shifter is built around the ESP32-S3-WROOM-1U-N4R2, from the ESP32 family.

How big is the Gear shifter PCB?

The Gear shifter measures 78 × 58 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Gear shifter?

53 components, from 30 distinct parts. The full bill of materials is listed on this page.

Where can I download the Gear shifter design files?

From the ManchesterStingerMotorsports/gear-shifter repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Gear shifter design in my own project?

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

Can I test firmware for the Gear shifter without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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