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 19seconds 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
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
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