Sniffer

About the Sniffer PCB

Sniffer is an open source RP2040/RP2350 PCB design by OpenRemise, published on GitHub under the CERN-OHL-W-2.0 license. It is a 2-layer board measuring 30 × 61.6 mm, with 44 components from 17 distinct parts.

Its main chip is the SC1631, from the RP2040/RP2350 family. Other key parts include the LM393DR2G, TL431A, SLHT50H and HCPL2630SDM. By type, the board carries 21 resistors, 7 capacitors, 5 ICs, 4 transistors, 4 diodes and 2 connectors.

From the project

The Sniffer is a small add-on board that turns a Raspberry Pi Pico into a DCC (and BiDi) logic analyzer.

Main components on the Sniffer

LM393DR2G TL431ASLHT50HHCPL2630SDMSC1631

Sniffer bill of materials (BOM)

44 components, 17 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	LM393DR2G LM393 onsemi	SOIC-8_3.9x4.9mm_P1.27mm	U1
1	TL431A EVVO	SOT-23_Handsoldering	U2
1	SLHT50H Shenzhen Slkormicro Semicon Co., Ltd.	SOT-23_Handsoldering	U3
2	HCPL2630SDM onsemi	SMDIP-8_W9.53mm	U4, U5
1	SC1631 RaspberryPi_Pico Raspberry Pi	RaspberryPi_Pico_SMD_HandSolder	A1
4	BC857B Taiwan Semiconductor Corporation	SOT-23_Handsoldering	Q1, Q2, Q3, Q4
2	1844210 TRACK Phoenix Contact	PhoenixContact_MC_1,5_2-G-3.5_1x02_P3.50mm_Horizontal	J1, J2
2	SBRT5A50SA-13 SBRT5A50SA Diodes Incorporated	D_SMA_Handsoldering	D1, D2
2	1N4148WS-7-F 1N4148WS Diodes Incorporated	D_SOD-323_HandSoldering	D3, D4
4	CL31B225KBHNNNE 2u2 Samsung Electro-Mechanics	C_1206_3216Metric_Pad1.33x1.80mm_HandSolder	C1, C2, C4, C5
3	CL21B104KBCNNNC 100n Samsung Electro-Mechanics	C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C3, C6, C7
6	RC0805FR-0710KL 10k YAGEO	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R1, R3, R10, R11, R12, R13
1	RCS08053R30FKEA 3R3 Vishay Dale	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R2
3	RC0805FR-07100RL 100 YAGEO	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R4, R7, R8
1	RC0805FR-07220RL 220 YAGEO	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R5
9	RC0805FR-072K2L 2k2 YAGEO	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R6, R14, R15, R16, R17, R18, R19, R20 +1
1	RC0805FR-074K7L 4k7 YAGEO	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R9

Sniffer design files

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

Sniffer: common questions

What microcontroller does the Sniffer use?

The Sniffer is built around the SC1631, from the RP2040/RP2350 family.

How big is the Sniffer PCB?

The Sniffer measures 30 × 61.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sniffer?

44 components, from 17 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 Sniffer design files?

From the OpenRemise/Sniffer 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 Sniffer design in my own project?

Yes, under the terms of its CERN-OHL-W-2.0 license, which OpenRemise chose for the repository.

Can I test firmware for the Sniffer without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.