Uni Edition. GNSS module
| Firmware variant | GNSS module | Comment |
|---|---|---|
| Receiver | Not required | |
| UAT bridge | Highly recommended | Bridging of UAT traffic into 'legacy' radio protocol needs accurate timing and true own position data to operate properly. It will NOT function in 'legacy' option without a GNSS source. OGNTP, P3I and (optional) FANET bridging should be fine without GNSS. |
| Solo | Required |
ATTENTION : be aware that 'stock' SensorTag has 'GNSS power pin' not assigned (NC) to any power source.
You need to solder a connection to the nearby VDD pin as shown on this picture:
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a GNSS module candidate has to operate from 3.0-3.3 Volts power source. Since SensorTag is normally battery powered and it's core CC1352 chip is able to operate down to 1.8 Volts - the GNSS can be the weakest component of the design if it requires more than 3.3 Volts to operate properly. Try to find a module that has 1.8V-3.6V supply power range ;
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SensorTag's core CC1352 MCU+Radio takes just around 12-15 mA of current at 'full power' (when not transmitting). Thus, in order to extend battery life, try to find least power consuming GNSS module possible ;
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PPS signal output is required
It is recommended to begin with very cheap (3-4 USD) 'noname NEO-6' module available at numerous online stores:
- it has appropriate pins mapping ;
- it is known to operate Ok within 3.0-3.3 Volts of power supply ;
- it takes 15-20 mA while having a fix in 'power save' mode (50+ mA in 'acquisition' mode).
It can be connected directly onto SensorTag pin header:
and has a good fit together with 'stock' rubber cover:
This GNSS module is based upon an MTK chipset.
It needs jumper wires to connect the module to SensorTag:
This GNSS module is based upon ublox 8 chipset.
