Experiments with Trimble's Lassen IQ
Inhaltsverzeichnis
1 Preamble
This place is still a storeground for ideas. Currently, I'm still far away from starting to work. This is also due to some other projects which clearly enjoy more priority.
2009-11-04 This projekt is still a storeground for ideas and will remain so. I got some more stuff in the meantime, but I also got some ingredients ready for some other idea related to this project:
Building an extremely small ARPS Tracker
2 Here comes the LassenIQ
The Lassen IQ is a GPS receiver that is extremely power efficient. Here are some links:
Here's a little theory on satellite navigation:
And here it is:
An Evaluation Board from SparkFun:
But I also read that the LassenIQ is somewhat outdated technology in the meantime, so I also purchased another GPS receiver module, which nicely fits on the same experimental board:
http://www.sparkfun.com/commerce/product_info.php?products_id=465
The 20 Channel EM-406A SiRF III Receiver with Antenna is far more sensitive, has more channels and consumes less energy. And it is far more compact. And it delivers its data by default in the NMEA format.
This will be another ingredient for my low power APRS tracking transmitter.
3 APRS-Tracker
The challenge is to build a high performance tracker as power efficient and as space-efficient as it can be.
Ingredients:
- Trimble LassenIQ
- Trimble ANT
- OpenTracker SMT
3.1 The OpenTracker SMT
Here's a photo of the OpenTracker SMT. It's really small:
The tracker's inner values:
- Voltage: DC 6.5 to 28V unregulated or 5V DC regulated
- Current: 8 mA idle, 20 mA transmitting Max 200 mA @ 5 V available for GPS
- Modes: 1200 bps AFSK (send and receive); 300 bps AFSK, PSK31 (send only)
- Radio Connector: pin header
- Serial Connector: pin header
- Dimensions: 31mm x 18mm x 5mm
- GPS interface: NMEA in/out
Pinout:
Pin Name Funktion 1 5VIN Geregelter 5-Volt-Eingang 2 RxD RS-232 Data in der (vom GPS oder Computer) 3 1Wire Dallas 1-Draht-Bus für externe Sensoren 4 AOUT Audio-Ausgang an Radio 5 ADC5 Analog-Eingang 6 T1CH1 Timer-Kanal 7 ADC6 Analog-Eingang 8 RST Reset (active low) 9 ADC7 Analog-Eingang 10 IRQ- Transmit-now, Profil wählen, oder Zähler 11 ADC8 Analog-Eingang 12 ADC9 Analog-Eingang 13 AIN Audio-Eingang von Radio 14 ADC4 Analog-Eingang 15 ADC3 Analog-Eingang 16 TXD RS-232 Data aus 17 rot rot LED-Ausgang 18 grün grün LED-Ausgang 19 ADC2 Analog-Eingang 20 ADC1 Analog-Eingang 21 PTT Push-to-talk-Signal an Radio 22 REGOUT Regulator-Ausgang - 5 Volt 23 GND Ground 24 REGIN Regulator-Eingang - 6,5 bis 28 Volt
3.2 Pinouts for the LassenIQ
Pin-Nr. Funktion Beschreibung 1 TXD A Sendeleitung der seriellen Schnittstelle 2 GND Masse 3 RXD A Empfangsleitung der seriellen Schnittstelle 4 PPS Puls pro Sekunde 5 reserviert nicht verbinden 6 reserviert nicht verbinden 7 Vcc 3,3±0,3V (ca. 33mA) 8 Batterie 2,5-3,6V (ca. 19μA)
This project could serve to implement a live Openstreetmap logger... Let's see.
4 Homebrew Data Logger
Actually, this might be my first ARDUINO project.
A glance at the others:
- http://nomadness.com/gps-datalogger
- http://elmicro.com/de/arduino.html
- http://www.mikrocontroller.net/topic/72507
- http://www.mikrocontroller.net/topic/68257#new
- http://www.embedtronics.com/GPS/lassenSQ.html
I'm still unsure how to do it... but there is that fantastic GPS shield from Watterott now...:
