2 layers100 × 54 mm
Ms2-card
GBert/railroad
git clone https://github.com/arendst/Tasmota.git cd Tasmota git tag pio run
26 parts36
2 layers70 × 50 mm
S88iso
GBert/railroad36git clone https://github.com/arendst/Tasmota.git cd Tasmota git tag pio run
- Size
- 70 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 33
- Pads
- 127
- Tracks, vias
- 222, 25
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 29 Aug 2013
- Updated
- 26 Oct 2026
Overview
S88iso is an open-source printed circuit board by GBert, from the GBert/railroad repository on GitHub. It is a 2-layer board of 70 × 50 mm with 33 parts on 33 nets, routed with 222 tracks and 25 vias.
It is built around the LM317, NSI8141W1 and RJ45. Its parts include 10 resistors, 6 capacitors, 4 connectors, 3 ICs and 3 diodes.
Main components
3
LM317
SOT-223-40℃~+85℃@(Ta) 0.003%Vout 1 1.3V~37V 1A 40V 80dB@(120Hz) Adjustable Positive Short Circuit Protection、Thermal shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSJSMSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
NSI8141W1
SOIC-16-300mil-40℃~+125℃ 1 150Mbps 150kV/us 15ns 2.5V~5.5V 2.5V~5.5V 3 4 5000 Channel direction configurable、Power-on reset、Output status configurable High Level SOIC-16-300mil Digital Isolators ROHSNOVOSENSEDigital Isolators
RJ45
TH-12PTH-12P SMT ROHSJLCPCB AssemblyUncategorised
README
ms2-card/README.mdESP8266
Tasmota Tests
git clone https://github.com/arendst/Tasmota.git cd Tasmota git tag pio run
{"NAME":"ESP-12F","GPIO":[1,1,1,1,1,1,0,0,1,1,1,1,1,1],"FLAG":0,"BASE":18}
user_config_override.h
// Select none or only one of the below defines USE_RULES or USE_SCRIPT
#ifdef USE_RULES
#undef USE_RULES // Add support for rules (+8k code)
#endif
#ifndef USE_SCRIPT
#define USE_SCRIPT
#endif
#define SDCARD_DIR //Not essential I think
#define USE_SCRIPT_FATFS_EXT //Not essential I think
#define USE_SCRIPT_FATFS //Not essential I think
#define USE_UFILESYS
#define USE_SDCARD
#define SDCARD_CS_PIN 4 //Not strictly necessary since the same #define happens in xdrv_50_filesystem.ino
//Further down I define SPI
#define USE_SPIFlashing
esptool.py --port /dev/ttyUSB1 erase_flash
esptool.py --port /dev/ttyUSB1 --baud 460800 write_flash --flash_size=detect 0 ./build_output/firmware/tasmota.binRaspberry Pi I2C Slave
| Function | GPIO | Pin | |
|---|---|---|---|
| SDA | GPIO2 | Pin 3 | |
| SCL | GPIO3 | Pin 5 | |
| SDA Slave | GPIO10 | Pin 19 | used |
| SCL Slave | GPIO11 | Pin 23 | used |
PI Pico
I2C Slave
| GPIO | Function | |
|---|---|---|
| GP4 | SDA | PIN 6 |
| GP5 | SCL | PIN 7 |
https://draeger-it.blog/maker-pi-pico-2-sensordaten-auf-einer-sd-card-speichern/
| GPIO | SD Mode | SPI Mode |
|---|---|---|
| GP10 | CLK | SCK |
| GP11 | CMD | SDI / MOSI |
| GP12 | DAT0 | SDO / MISO |
| GP13 | DAT1 | X |
| GP14 | DAT2 | X |
| GP15 | CD/DAT3 | CSn |
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100nF | Capacitor_SMD:C_0805_2012Metric | C1, C3, C4, C6, C7 |
| 3 | 56 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R6, R7, R8 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R9, R10 |
| 2 | RJ45 | w_conn_pc:megb8-8-Uni | Input_S88, Zentrale_S88 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric | R5 |
| 1 | 12V 5V | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | 1k5 | Resistor_SMD:R_0805_2012Metric | R4 |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2 |
| 1 | 240 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1 |
| 1 | 270 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3 |
| 1 | 4504 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U2 |
| 1 | 5V Bypass | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | 5V1 | Diode_SMD:D_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3 |
| 1 | 750 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2 |
| 1 | Barrel_Jack_Switch_MountingPin | w_conn_misc:dc_socket | J1 |
| 1 | Conn_01x04 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J4 |
| 1 | Conn_01x06 | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Horizontal | S88 |
| 1 | LM317 | Package_TO_SOT_SMD:TO-252-2 | U1 |
| 1 | M7 | Diode_SMD:D_SMA | D1 |
| 1 | NSI8141W1 | Package_SO:SOIC-16W_7.5x10.3mm_P1.27mm | U3 |
| 1 | Power LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2 |
The 29 most common of 33 parts.
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Questions
How big is the S88iso PCB?
It measures 70 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the S88iso use?
33 parts, built around the LM317, NSI8141W1 and RJ45. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the S88iso KiCad files?
From the GBert/railroad repository on GitHub, at the commit this page was made from: the board is s88isolated/s88iso/s88iso.kicad_pcb and its schematic ms2-card-esp8266/ms2-card.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the S88iso design in my own project?
Its repository states no licence, so its author keeps all rights: ask GBert before reusing the design.