The OzzMaker SARA-R5 LTE-M GPS + 10DOF is a feature-packed board, which includes the following components:

• LTE-M cellular modem (Nano sim slot)
• GPS (including assisted GPS)
• Accelerometer
• Gyroscope
• Magnetometer (Compass)
• Barometric/pressure sensor (altitude)
• Temperature sensor
• Qwiic port

It comes in the same form factor as a Raspberry Pi Zero, which makes it nice and compact when used with a Pi Zero. It will also work with all other versions of Raspberry Pi.

This board includes a SARA-R510M8S module from uBlox, this module can be used for LTE-M connectivity and includes an integrated GPS receiver. Using both these features together results in obtaining a GPS fix in seconds, using Assisted GPS.

Typically, a GPS module can take a few minutes to get Time To First Fix (TTFF), or even longer if you are in built-up areas. This is because the almanac needs to be downloaded from satellites before a GPS fix can be acquired and only a small portion of the Almanac is sent in each GPS update.

Assisted GPS speeds this up significantly by downloading ephemeris, almanac, accurate time and satellite status over the network, resulting in faster TTTF, in a few seconds. This is very similar how to GPS works on a smartphone.

The below video shows a comparison between assisted and normal GPS.

• Assisted GPS takes 19 seconds to get a fix
• Normal GPS takes 8min 22 seconds to get a fix

IMU

This board is also fitted with an inertial measurement unit, or IMU. An IMU measures and reports on velocity, orientation and gravitational forces, using a combination of an accelerometer, gyroscope and magnetometer.

We have also included a barometric sensor (BM388) which can be used to calculate altitude. A temperature sensor is also included.

LTE-M Cellular Modem Features

The cellular modem used on this board is the SARA-R510M8S from uBlox

• Global coverage
• LTE-M bands 1, 2, 3, 4, 5, 8, 12, 13, 18, 19, 20, 25, 26, 28, 66, 71, 85
• CellTime
• Jamming Detection
• Antenna dynamic tuning
• MQTT, MQTT-SN
• u.FL Antenna Connector
• Nano SIM card holder

LTE-M/GSM Antenna

A quad-band LTE-M/GSM antenna is included in this purchase.

GPS Receiver features

The SARA-R510M8 includes an integrated powerful M8 GNSS receiver, which is an advanced high quality GPS module.

• 3 concurrent GNSS: Concurrent reception of up to 3 GNSS (GPS, Galileo, GLONASS, BeiDou)
• Protocols: NMEA, UBX binary, RTCM
• Update Rate: Single GNSS – up to 18Hz, Dual GNSS up to 10Hz
• Connection for external antenna: a uFL connector for an external antenna.

An external GPS antenna is needed (not included).

Hologram SIM included

We also include a SIM, which makes for easy activation.

The Hologram SIM card is the perfect connectivity solution for global IoT applications. Their cellular network has coverage in over 196 countries and partnerships with 550+ carriers. Their offer flexible pricing with pay-as-you-go rates and monthly plans.

Notes

• The LTE-M modem and the GPS module can both be accessed at the same time through the Pi serial interface using MUX protocol (GSM 07.10).
• External GPS Antenna and Raspberry Pi not included
• Some very basic soldering is required to solder on the female header
• Check with your local service provider that they offer LTE-M coverage

Specifications

General

• Dimensions: 65 mm x 30 mm
• Weight: 8g

GPS Receiver

• Low current consumption, <200uA when using Periodic mode.
• Receiver Type:
  • 72-channel u-blox M8 engine
  • GPS/QZSS L1 C/A, GLONASS L10F,
  • BeiDou B11, Galileo E1B/C
  • SBAS L1 C/A: WAAS, EGNOS, MSAS, GAGAN
• Altitude of 50,000m
• 3.3v supply
• NMEA, UBX binary, RTCM
• UART 4800/9600/38400/115200/230400/460800 bps
• Max update rate 10 Hz
• Horizontal position accuracy <2.5m CEP
• Acquisition sensitivity -148dBm
• Tracking sensitivity -167dBm
• Hot start <1s
• Assisted start <3s
• Cold start <26s
• Orbit prediction
• One external pin for wake up
• u.FL Antenna Connector

IMU

Gyroscope – LSM6DSL

• i2c and SPI interface
• Measurement range 125/250/500/1000/2000 dps
• Sensitivity 4.375, 8.75, 17.50, 35, 70 mdps

Accelerometer – LSM6DSL

• i2c and SPI interface
• Scales of 2g / 4g / 8g / 16g

Magnetometer – MMC5983MA

• Scale of 8g
• 16bit or 18bit operation
• Internal temperature sensor

Barometric Sensor BMP388

• i2c interface
• Pressure range 300 … 1250 hPa
• Resolution of data: Pressure: 0.18 Pa (eqiuv. to <10 cm)
• Absolute accuracy 50 Pa
• Relative accuracy 8Pa (equiv. to 0.6 m)
• Temperature range -40 …+85 C

Package Contents

• OzzMaker SARA-R5 LTE-M GPS + 10DOF
• 1 x female header
• 4 x Nylon standoffs, nuts and screws
• 1 x Hologram SIM
• 1 x LTE/GSM quad-band GSM antenna

External GPS Antenna and Raspberry Pi not included

Resources

• OzzMaker SARA-R5 LTE-M GPS + 10DOF Overview
• Using the GPS on OzzMaker SARA-R5 LTE-M GPS + 10DOF
• Assisted GPS on OzzMaker SARA-R5 LTE-M GPS + 10DOF
• How to enable multiplexing on the Raspberry Pi Serial interface
• Using the LTE-M cellular modem to create a data connection with PPP
• IMU GitHub Repo
• CAD File
• Schematic

LTE-M and GPS specific

• SARA-R5 Datasheet
• SARA-R5-R4-GNSS Implementation AppNote
• SARA-R5 AT Commands

Datasheets for IMU

• LSM6DSL – Accelerometer and gyroscope datasheet
• MMC5983MA – Magnetometer datasheet
• BM388 – Pressure sensor datasheet