Satellite Dimensions & Mounting
Everything on this page is taken from the design values in
hardware/satellite/SunSproutSatellite.kicad_pcb, not measured on a fabricated board. If you need exact three-dimensional geometry — component
heights, connector bodies, mating clearances — use the STEP model linked from
Design Files rather than working from the numbers here.
Board Outline
| Property | Value |
|---|---|
| Outline Dimensions | 27.25 × 51.10 mm |
| Thickness | 1.6 mm |
| Copper Layers | 4 (F.Cu, In1.Cu, In2.Cu, B.Cu) |
| Corners | Square — no radius |
| Cutouts / Notches | None |
The outline is a clean, slender rectangle engineered to fit inside slim waterproof enclosures, electrical conduit, or outdoor probe housings. There is no asymmetrical keying cutout; orient the board by the RJ45 jack (J1) facing the cable entry point.
Coordinate Frame
All positions below are given in millimetres from the top-left corner of the board, viewed from the component (top) side:
- X = 0.0 mm at the left edge, increasing to the right (+X).
- Y = 0.0 mm at the top edge, increasing downward (+Y).
This matches the coordinate convention used in KiCad 10 and aligns directly with the board layout and interactive pinout diagram.
Mounting Holes
The board provides three non-plated mounting holes sized for standard M2 hardware:
| Hole | X (mm) | Y (mm) | Inset X | Inset Y | Purpose |
|---|---|---|---|---|---|
| MP1 | 3.00 | 3.00 | 3.0 mm from left | 3.0 mm from top | Top-left corner mounting |
| MP2 | 24.25 | 3.00 | 3.0 mm from right | 3.0 mm from top | Top-right corner mounting |
| MP3 | 12.00 | 32.10 | 12.0 mm from left | Mid-board (32.1 mm) | Central mechanical standoff support |
Mounting Hole Specifications
| Property | Value |
|---|---|
| Drill Diameter | Ø2.1 mm |
| Fastener Size | M2 (screws or hex standoffs) |
| Plating | Non-plated |
| Top Hole Span | 21.25 mm (center-to-center between MP1 and MP2) |
Because the mounting holes are non-plated, metal screws or standoffs provide no electrical ground connection to the board. If chassis or shield grounding is desired, bond to the shield jumper (JP13) or a ground pin on header J9.
Connector Locations & Clearances
All connectors are through-hole components mounted on the top side of the PCB. Positions are each footprint's origin, which is pin 1 for the headers and sensor ports. Heights are approximate.
| Ref | Function | Part / Type | X (mm) | Y (mm) | Orientation | Height Above PCB |
|---|---|---|---|---|---|---|
J1 | Differential I2C / Cable Input | Amphenol RJHSE5380 (8P8C / RJ45) | 15.95 | 45.20 | Facing bottom edge | ~13.5 mm |
J6 | 1-Wire Temperature Probe | JST PH 2.0mm 3-pin vertical | 3.65 | 8.30 | Vertical (left edge) | ~6.0 mm (~7.5 mm mated) |
J2 | Moisture Sensor Channel 1 | JST PH 2.0mm 3-pin vertical | 3.70 | 17.40 | Vertical (left edge) | ~6.0 mm (~7.5 mm mated) |
J3 | Moisture Sensor Channel 2 | JST PH 2.0mm 3-pin vertical | 3.65 | 26.50 | Vertical (left edge) | ~6.0 mm (~7.5 mm mated) |
J4 | Moisture Sensor Channel 3 | JST PH 2.0mm 3-pin vertical | 3.60 | 35.50 | Vertical (left edge) | ~6.0 mm (~7.5 mm mated) |
J5 | Moisture Sensor Channel 4 | JST PH 2.0mm 3-pin vertical | 3.60 | 44.50 | Vertical (left edge) | ~6.0 mm (~7.5 mm mated) |
J8 | Qwiic / STEMMA QT Extension | JST SH 1.0mm 4-pin vertical | 10.40 | 14.70 | Vertical (top-mid) | ~3.0 mm (~4.5 mm mated) |
J9 | Local Satellite Power (3.3V) | 1×2 Pin Header (2.54mm pitch) | 24.20 | 14.50 | Vertical (right edge) | ~8.5 mm mated |
J7 | Cable Bus Power Tap | 1×4 Pin Header (2.54mm pitch) | 24.20 | 25.10 | Vertical (right edge) | ~8.5 mm mated |
Connector Spacing Highlights
- Sensor Port Strip (
J6,J2–J5): The five sensor connectors form a neat, uniform line along the left edge. The centers sit roughly 3.65 mm from the board edge, with a consistent ~9.0 mm vertical pitch between successive connectors:J6(Y = 8.30 mm)J2(Y = 17.40 mm, Δ = 9.1 mm)J3(Y = 26.50 mm, Δ = 9.1 mm)J4(Y = 35.50 mm, Δ = 9.0 mm)J5(Y = 44.50 mm, Δ = 9.0 mm)
- RJ45 Differential Port (
J1): Positioned at the bottom center (X = 15.95, Y = 45.20 mm). The jack's mating face is flush with the bottom board edge with the release latch facing downward towards the PCB.
Solder Jumpers & Configuration Points
The board's configuration jumpers are mostly on the bottom side. The top-side ones are JP11 and JP19. See Satellite Pins & Jumpers for what each one does.
| Ref | Layer | Position (X, Y) | Default State | Function |
|---|---|---|---|---|
JP1 | Bottom | (12.00, 19.30) | Pads 1-2 bridged (Address 0x48) | ADS1115 I2C address strap selector. Cut bridge to select alternate address. |
JP11 | Top | (20.30, 8.90) | Both pull-ups bridged | Dual-trace single-cut jumper for the local I2C pull-ups on SCL_LOCAL/SDA_LOCAL. |
JP13 | Bottom | (24.10, 38.30) | Bridged | Bonds RJ45 metal shield (J1.SHIELD) to RJ45_GND_1. Cut for single-point grounding. |
JP16 | Bottom | (13.50, 12.40) | Both grounded (Address 0x18) | Configures address strap pins on the DS2482-100+ 1-Wire bridge using bit-weighting. |
JP17 | Bottom | (21.50, 17.30) | Bridged | Bonds cable ground (RJ45_GND_1) to satellite system GND. Cut to separate the grounds when powering externally. |
JP18 | Bottom | (24.00, 17.30) | Bridged | Passes Pair 1 cable power (RJ45_VCC_1) directly into local SAT_3V3. Cut to insert an external regulator between J7 and J9. |
JP19 | Top | (13.60, 2.80) | Bridged | Connects the power status LED (LED1) to ground. Cut to disable the LED. |
Enclosure & Mechanical Clearances
When designing or choosing an enclosure for the SunSprout Satellite:
- Internal Cavity Width: At least 29.0 mm (providing ~0.9 mm clearance on both lateral sides of the 27.25 mm PCB).
- Internal Cavity Length: At least 53.0 mm for the PCB body, plus cable egress clearance.
- Cable Egress Clearance: Allow at least 35.0 mm clearance extending off the bottom edge (below
J1) to accommodate the mating RJ45 plug body, strain relief boot, and minimum bend radius. - Vertical Clearance (Top Side): At least 15.0 mm above the top copper face. The RJ45 jack stands 13.5 mm tall; extra headroom ensures easy mating/unmating of the latch and vertical JST PH plugs.
- Vertical Clearance (Bottom Side): At least 2.5–3.0 mm standoff clearance beneath the bottom copper layer to clear through-hole leads, clipped pins, and solder jumper beads.