ET-S42
ZED-F9P RTK GNSS
Multi-band RTK GNSS, centimetre-level
AED 829.00
Out of stockOverview
Multi-band RTK GNSS, centimetre-level
The ET-S42 is built around the u-blox ZED-F9P: L1/L2 (+E5b/B2I), RTK and moving-base, ~1cm + 1ppm with corrections, up to 20Hz RTK. It runs from VIN 3.3–5.5V (~150mA) or USB-C via JP4.
Two Qwiic / STEMMA QT connectors let you chain it with other boards without soldering, and the 2.54 mm header fits a breadboard.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- RTK drones and rovers
- Surveying and mapping
- Precision agriculture
Key features
What makes it different
Module
u-blox ZED-F9P: L1/L2 (+E5b/B2I), RTK and moving-base, ~1cm + 1ppm with corrections, up to 20Hz RTK
Interfaces
USB-C (u-center config, native), Qwiic I2C 0x42, UART1 (NMEA/UBX), UART2 (RTCM in/out for base/rover radios), 1PPS
Antenna
u.FL with 3.3V bias for active L1/L2 antennas
Supply
VIN 3.3–5.5V (~150mA) or USB-C via JP4
Qwiic / STEMMA QT
Two JST-SH connectors plus a 2.54 mm header — 3.3 V and 5 V hosts.
Open documentation
Schematic, BOM and layout notes published for every board.
Specifications
Technical specifications
| Module | u-blox ZED-F9P: L1/L2 (+E5b/B2I), RTK and moving-base, ~1cm + 1ppm with corrections, up to 20Hz RTK |
|---|---|
| Interfaces | USB-C (u-center config, native), Qwiic I2C 0x42, UART1 (NMEA/UBX), UART2 (RTCM in/out for base/rover radios), 1PPS |
| Antenna | u.FL with 3.3V bias for active L1/L2 antennas |
| Supply | VIN 3.3–5.5V (~150mA) or USB-C via JP4 |
| Size | 50.8 × 38.1 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 2 × Qwiic / STEMMA QT (JST SH 4-pin) · 10-pin 2.54 mm header · U.FL receptacle 50Ω — Antenna (u.FL → SMA pigtail) · USB-C 16P receptacle (USB 2.0) — USB-C for u-center |
| Main IC | ZED-F9P-04B (LCSC C5120257) |
| Revision | Rev B |
| Libraries | SparkFun u-blox GNSS v3, RTKLIB/str2str, ArduPilot/PX4 (UBX), ESPHome gps |
|---|
| JP1 (default Closed) | Cut to turn off the LED |
|---|---|
| JP2 (default Closed) | Cut to remove the host-side I2C pull-ups |
| JP3 (default Closed) | Active-antenna bias ON (multi-band antennas are active). Cut for passive/externally powered antennas |
| JP4 (default Open) | Close to power the board from USB-C alone. Keep open when Qwiic/J3 also supplies VIN |
Performance
Position accuracy
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Power | 3.3–5.5V |
| 2 | 3V3 | Power | LDO output |
| 3 | GND | Ground | Ground |
| 4 | SCL | I²C | I²C clock |
| 5 | SDA | I²C | I²C data |
| 6 | TX1 | UART | UART1 out |
| 7 | RX1 | UART | UART1 in |
| 8 | TX2 | UART | UART2 out (RTCM) |
| 9 | RX2 | UART | UART2 in (RTCM corrections) |
| 10 | PPS | Output | 1PPS |
Qwiic / STEMMA QT pins: GND, VIN, SDA, SCL (same on both connectors). I²C pull-ups (10 kΩ) are on the board; cut JP2 to remove them.
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-S42 ZED-F9P RTK GNSS (assembled)
- 1 × 10-pin 2.54 mm male header, unsoldered
Getting started
- Plug in a Qwiic / STEMMA QT cable, or solder the header and wire VIN, GND, SDA and SCL
- Libraries: SparkFun u-blox GNSS v3, RTKLIB/str2str, ArduPilot/PX4 (UBX), ESPHome
gps
Compare
Which navigation board?
| ZED-F9P RTK GNSS (this board)This board | ET-S41 MAX-M10S Multi-GNSS Receiver | ET-S43 SDP810 Airspeed Sensor | |
|---|---|---|---|
| What it does | Multi-band RTK GNSS, centimetre-level | GPS, Galileo, BeiDou and GLONASS with backup battery | Differential-pressure airspeed sensor with pitot kit |
| Interface | — | I²C (DDC) 0x42 via Qwiic and UART on the header,… | I²C 0x25 |
| Best for | RTK drones and rovers | Drone and rover navigation | Fixed-wing drone airspeed |
| Price | 829 AED | 89 AED | 89 AED |
Downloads
Documents and design files
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