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Lokkkarten Emulator

GBert·railroad·ms2-card-esp8266/ms2-card.kicad_pcb

Lokkkarten Emulator PCB layout, top view — open source ESP8266 board by GBert
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About the Lokkkarten Emulator PCB

Lokkkarten Emulator is an open source ESP8266 PCB design by GBert, published on GitHub. It is a 2-layer board measuring 100 × 54 mm, with 50 components from 23 distinct parts.

Its main chip is the ESP-12F, from the ESP8266 family. Other key parts include the FM24CL64B, BL1551B, AMS1117-3.3 and CP2102N-A02-GQFN24R. By type, the board carries 22 resistors, 12 capacitors, 7 ICs, 4 diodes, 3 transistors and 2 connectors.

From the project

Auf der Lokkarte befindet sich ein I2C EEPROM (24LC64 64kBit -> 8kByte). Die Schaltung ersetzt den Speicher durch ein kompatiblen FRAM Baustein (U2). Dadurch entfällt die zeitkritische I2C Slave Behandlung.

Auf der Lokkarte befindet sich ein I2C EEPROM (24LC64 64kBit -> 8kByte). Die Schaltung ersetzt den Speicher durch ein kompatiblen FRAM Baustein (U2). Dadurch entfällt die zeitkritische I2C Slave Behandlung.

Der Prozessor (ESP8266 oder extern) befüllt den FRAM Baustein mit Lokkarten Daten. Damit es zu keinen Komplikationen auf dem MS2 I2C Bus kommen kann, ist der I2C Bus durch analoge Schalter (BL1551B - Signal I2C_Select) getrennt.

Lokkkarten Emulator, from the project README
From the project README

Main components on the Lokkkarten Emulator

ESP-12FFM24CL64BBL1551BAMS1117-3.3CP2102N-A02-GQFN24R

Lokkkarten Emulator bill of materials (BOM)

50 components, 23 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP-12F
U1
1
FM24CL64B
U2
3
BL1551B
U3, U4, U20
1
AMS1117-3.3
U6
1
CP2102N-A02-GQFN24R
U30
2
MMBT3904
Q1, Q2
1
MMBT5401
Q3
1
C2889258
MicroSD_SPI_CD
J10
1
C132563
USB_B_Micro
J30
3
LED
D1, D31, D32
1
SP0503BAHT
D30
9
100NF
100nF
C2, C3, C4, C5, C6, C10, C20, C31 +1
1
4.7UF
4.7uF
C7
1
470NF
470nF
C8
1
1UF
1uF
C30
1
680
R1
9
4K7
4k7
R2, R11, R12, R13, R14, R15, R20, R21 +1
3
10K
10k
R3, R8, R9
1
100
R4
4
47K
47k
R5, R6, R22, R23
Show 3 more
QtyPartRefs
1
180K
180k
R7
1
75K
75k
R10
2
330
R31, R32

Lokkkarten Emulator design files

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

Lokkkarten Emulator: common questions

What microcontroller does the Lokkkarten Emulator use?

The Lokkkarten Emulator is built around the ESP-12F, from the ESP8266 family.

How big is the Lokkkarten Emulator PCB?

The Lokkkarten Emulator measures 100 × 54 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Lokkkarten Emulator?

50 components, from 23 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 Lokkkarten Emulator design files?

From the GBert/railroad 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 Lokkkarten Emulator design in my own project?

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

Can I test firmware for the Lokkkarten Emulator without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP8266 firmware against it before you order a PCB.

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