Hw microdiff
About the Hw microdiff PCB
Hw microdiff is an open source PCB design by aw, published on GitHub under the CC-BY-SA-4.0 license. It is a 4-layer board measuring 22.5 × 46 mm, with 26 components from 22 distinct parts.
Other key parts include the C6187, C6186 and C8963. By type, the board carries 7 jumpers, 5 capacitors, 5 resistors, 3 ICs, 3 connectors and 2 diodes.
It belongs with the iot & wireless designs in this gallery.
From the project
An RS485/RJ45 stackable hardware module
A simple 46mmx22.5mm module to route power and differential signals (RS-485) over RJ-45.
This project is also described in detail on Hackaday.io
It can be purchased as a kit from Tindie
This project is certified open hardware:
μDiff provides an easy way to reliably transfer power and a digital signal over a long-distance using an inexpensive RJ-45 cable.
It uses RS-485 differential signaling and 802.3af Power-over-Ethernet pinouts to achieve this. It can accept an input voltage between 6.5V-12V, and provides outputs of 5V and 3.3V. All signals and voltages can be accessed through a…
Main components on the Hw microdiff
Hw microdiff bill of materials (BOM)
26 components, 22 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | C6187 5V/1A | SOT-223 | U1 |
| 1 | C6186 3.3V/1A | SOT-223 | U2 |
| 1 | C8963 RS-485 | SOIC-8_3.9x4.9mm_P1.27mm | U3 |
| 1 | Power Input | PinSocket_1x03_P2.54mm_Vertical | J1 |
| 1 | Header 2x5P | PinSocket_2x05_P2.54mm_Vertical | J2 |
| 1 | 8P8C | RJ45_Hanrun_HR911105A | J3 |
| 1 | C910830 Fuse 24V/1A | Fuse_1206_3216Metric | F1 |
| 1 | GND EN | PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | VIN EN | PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | Grounding | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP3 |
| 1 | Biasing- | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP4 |
| 1 | Biasing+ | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP5 |
| 2 | Terminating | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP6, JP7 |
| 1 | C8678 Diode 40V/3A | D_SMA | D1 |
| 1 | C72041 Blue LED | LED_0603_1608Metric | D2 |
| 2 | C14663 0.1uF 50V | C_0603_1608Metric | C1, C4 |
| 2 | C5672 22uF 10V | C_1206_3216Metric | C2, C3 |
| 1 | C19702 10uF 10V | C_0603_1608Metric | C5 |
| 1 | C17557 220R | R_0805_2012Metric | R1 |
| 1 | 10K | R_0805_2012Metric | R2 |
Show 2 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 390R | R_0805_2012Metric | R3, R4 |
| 1 | 100R | R_0805_2012Metric | R5 |
Hw microdiff design files
The KiCad project lives in the aw/hw-microdiff repository on GitHub; these links point at the commit this page was built from.
- Layouthw-microdiff.kicad_pcb
- Schematichw-microdiff.kicad_sch
- BOMhw-microdiff-bom-v04.csv
Hw microdiff: common questions
How big is the Hw microdiff PCB?
The Hw microdiff measures 22.5 × 46 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Hw microdiff?
26 components, from 22 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 Hw microdiff design files?
From the aw/hw-microdiff 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 Hw microdiff design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which aw chose for the repository.
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