Satellite Pins & Jumpers

The SunSprout Satellite acts as a remote sensor endpoint terminating a differential-I2C cable run from the Hub. This page details all physical connector pinouts, sensor interfaces, and the hardware configuration solder jumpers on the bottom of the board.

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1. Top View: Ports & Connectors

The top side exposes the primary RJ45 differential bus interface (J1), five JST PH 2.0mm sensor ports (J2–J6), and the auxiliary power header (J7).

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Connector Pinout Tables

Primary RJ45 Interface (J1)

Terminates standard Category-rated twisted-pair patch cable from the Hub. Uses standard T568B pair pairings for differential integrity.

RJ45 Pin	Net Name	Function / Description	Twisted Pair
1	DSCL_N	Differential I2C Clock (Negative)	Pair 2 (Orange/White)
2	DSCL_P	Differential I2C Clock (Positive)	Pair 2 (Orange)
3	RJ45_VCC_2	Auxiliary Power Conductor (Pass-through to J7 pin 4)	Pair 3 (Green/White)
4	RJ45_VCC_1	Primary Cable Power (Powers diff transceivers; feeds SAT_3V3 via JP18)	Pair 1 (Blue)
5	RJ45_GND_1	Primary Ground Return (Pass-through to J7 pin 2; bridges to system GND via JP17)	Pair 1 (Blue/White)
6	RJ45_GND_2	Auxiliary Ground Return (Pass-through to J7 pin 3)	Pair 3 (Green)
7	DSDA_N	Differential I2C Data (Negative)	Pair 4 (Brown/White)
8	DSDA_P	Differential I2C Data (Positive)	Pair 4 (Brown)
SH	SHIELD	RJ45 Metal Chassis Shield (Tied to RJ45_GND_1 via JP13)	Outer Braid / Foil

Soil Moisture Sensor Ports (J2 – J5)

Vertical 3-pin JST PH (2.0mm pitch) connectors. Designed for capacitive analog moisture probes (e.g., Gravity / SEN0193).

Connector	Pin 1	Pin 2	Pin 3	ADC Channel	Notes
J2	GND	SAT_3V3	MOIST1	ADS1115 AIN0	Moisture Probe Channel 1
J3	GND	SAT_3V3	MOIST2	ADS1115 AIN1	Moisture Probe Channel 2
J4	GND	SAT_3V3	MOIST3	ADS1115 AIN2	Moisture Probe Channel 3
J5	GND	SAT_3V3	MOIST4	ADS1115 AIN3	Moisture Probe Channel 4

1-Wire Temperature Sensor Port (J6)

Vertical 3-pin JST PH connector for waterproof digital temperature probes (DS18B20). Driven by the onboard DS2482-100+ hardware I2C-to-1-Wire bridge, whose internal pull-up drives the line. A footprint for an optional external 4.7kΩ pull-up (R9) is left unpopulated.

Pin	Net Name	Function	Wire Color (Typical DS18B20)
1	SAT_3V3	Power Supply	Red (VCC)
2	GND	Ground Return	Black / Blue (GND)
3	ONEWIRE_DQ	1-Wire Bidirectional Data	Yellow / White (DATA)

Cable Power Breakout Header (J7)

Standard 2.54mm (0.1") pitch 4-pin header breaking out raw conductors from cable Pairs 1 and 3 for external tapping or powering off-board modules.

Pin	Net Name	Description	Twisted Pair
1	RJ45_VCC_1	Primary cable supply conductor from RJ45 pin 4	Pair 1 (Blue)
2	RJ45_GND_1	Primary cable ground conductor from RJ45 pin 5	Pair 1 (Blue/White)
3	RJ45_GND_2	Secondary/auxiliary ground conductor from RJ45 pin 6	Pair 3 (Green)
4	RJ45_VCC_2	Secondary/auxiliary power conductor from RJ45 pin 3	Pair 3 (Green/White)

Satellite Local Power Header (J9)

Standard 2.54mm (0.1") pitch 2-pin header for local voltage regulation or direct 3.3V board power injection.

Pin	Net Name	Description
1	SAT_3V3	Satellite local 3.3V power rail (powers ADC, 1-Wire bridge, sensors, and Qwiic)
2	GND	System digital and analog ground

Power Status Indicator (LED1 & JP19)

• LED1: A dedicated green 0805 SMD LED located on the top side near the mounting hole illuminates whenever the regulated SAT_3V3 rail is powered (via cable power or local injection).
• JP19: A 2-pad normally closed (bridged) solder jumper in series with LED1's cathode return to GND. For battery-powered or ultra-low-power field deployments, slice the trace across JP19 with a hobby knife to remove the LED's current draw.

[!TIP] Long-Distance Cable Regulation: If the satellite is deployed on a long cable run with noticeable 3.3V IR drop:

1. Cut solder jumper JP18 (isolating SAT_3V3 from cable RJ45_VCC_1).
2. Cut the hub's JP2 and JP3 jumpers, then inject higher voltage (e.g., 12V or 24V) at the Hub onto Pair 3 (VCC_2 / GND_2).
3. Connect a compact 3.3V buck regulator module: Input to J7 (pins 3 & 4), Output to J9 (SAT_3V3 & GND). The PCA9615 differential transceiver and termination continue to run reliably off RJ45_VCC_1, while local sensors receive clean, local regulation.

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2. Bottom View: Hardware Jumpers & Addressing

The bottom side hosts most of the solder jumpers, for configuring I2C addresses and managing power and ground routing. JP11 and JP19 are on the top side.

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Hover over any pin to inspect • Click to copy identifier

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Jumper Configuration Matrix

JP1: ADS1115 I2C Address Selection (4-Way)

A 4-way solder jumper connecting the ADS1115 ADDR pin to select one of four unique I2C bus addresses.

Configuration	Bridge Position	7-bit Address	State
Pads 1-2	ADDR connected to GND	0x48	Factory Default (Pre-bridged with copper trace)
Pads 1-3	ADDR connected to SAT_3V3	0x49	Cut 1-2 trace; solder bridge 1-3
Pads 1-4	ADDR connected to SCL_LOCAL	0x4B	Cut 1-2 trace; solder bridge 1-4
Pads 1-5	ADDR connected to SDA_LOCAL	0x4A	Cut 1-2 trace; solder bridge 1-5

[!TIP] To change the address, slice the thin copper trace bridging pads 1 and 2 with a hobby knife, then apply a small solder blob between pad 1 (common) and your chosen address pad.

JP16: DS2482-100+ 1-Wire Master Address Selection (Bit-Weighted Dual Jumper)

Controls the AD0 (+1 bit weight) and AD1 (+2 bit weight) address select pins of the I2C-to-1-Wire bridge. The bit weights and the default address are marked on the board.

Address Bits	Bridge Selection	7-bit Address	Configuration Method
AD1=0, AD0=0	Pads 2A to GND & 2B to GND	0x18	Factory Default (Pre-bridged traces to GND)
AD1=0, AD0=1	Cut 2A bridge; solder bridge 2A to SAT_3V3	0x19	Adds +1 to base address 0x18
AD1=1, AD0=0	Cut 2B bridge; solder bridge 2B to SAT_3V3	0x1A	Adds +2 to base address 0x18
AD1=1, AD0=1	Cut both bridges; solder both to SAT_3V3	0x1B	Adds +1 + 2 to base address 0x18

JP11: Local I2C Pull-Up Resistor Disconnect

• Purpose: Disconnects the two onboard 4.7kΩ pull-up resistors on SDA_LOCAL and SCL_LOCAL.
• Design: Collinear single-cut 3-pad jumper on top side.
• Usage: Both pull-ups are enabled by default. Slice across the center cut line with a single blade stroke to disable both local pull-ups if the bus master already provides adequate pull-up strength.

JP19: Power Status LED Disconnect (LED1)

• Default (Bridged): The green power status LED (LED1) cathode returns to GND through pre-bridged trace on JP19.
• Cuttable: Slicing the copper trace between pads of JP19 on the top side disables LED1 to remove its current draw in battery or energy-harvesting deployments.

JP18: Power Source Bridge (RJ45_VCC_1 $\leftrightarrow$ SAT_3V3)

• Default (Bridged): Satellite local power (SAT_3V3) is fed directly from cable Pair 1 (RJ45_VCC_1).
• Cuttable: Slicing the copper trace disconnects SAT_3V3 from the cable supply, allowing local power injection via J9 from an external buck or LDO regulator.

JP17: Ground Bridge (RJ45_GND_1 $\leftrightarrow$ GND)

• Default (Bridged): Cable primary ground (RJ45_GND_1) is bonded directly to local system GND.
• Cuttable: Slicing this bridge separates the cable ground return from local sensor and analog ground, for a split-supply setup. This is not galvanic isolation: the PCA9615 is not an isolator, so the two grounds must stay close in potential.

JP13: Cable Shield Grounding

• Default (Bridged): The metal shield of the RJ45 jack is tied directly to RJ45_GND_1.
• Cuttable: Slicing the copper trace between pads 1 and 2 isolates the cable shield from satellite ground, enabling single-point earth grounding at the Hub end to prevent ground loops.

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3. Interactive BOM Viewer

For interactive probing and component highlighting:

• Open the Satellite Interactive BOM — Click any component to highlight its footprint, routing, and pin connections.