GPS - ANT+ / BT

We´ll use the module PAN1327 which integrates a complete solution for ANT+ y BT

ANT+ / BT Schematics

GPS - Sensors

We´ll use the MAX6631 temperature sensor
Datasheet: http://www.mouser.com/ds/2/256/MAX6629-MAX6632-89478.pdf

• Range -55ºC ->  +125ºC
• Precision +/- 0.2ºC
• Sampling time = 8seg
• Idle current 6uA @ 3.3V

Temperature sensor schematics

The barometer will be MS5611-01BA03

Datasheet: http://www.meas-spec.com/downloads/MS5611-01BA03.pdf

• Resolution: 10cm
• Conversion time 1ms
• Current 1uA
• Interface SPI or I2C
• Range 10 to 1200mbar
• Integrated Termometer (+/- 2ºC)

Barometer schematics

We´ll use the combined accelerometer/magnetometer/gyroscope LSM9DS0

Datasheet: http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00087365.pdf

Accelerometer schematics

Ambient light sensor will be APDS-9004

Datasheet: http://www.mouser.com/ds/2/38/V01-0184EN-107079.pdf

Ambien light sensor schematics

GPS - GNSS Module

We´ll use the swiss made u-blox MAX 7Q GNSS module with the following features:

• GPS / GLONASS / QZSS
• UART or I2C interface
• Real time clock RTC with integrated crystal
• Timepulse generation
• 56 channels
• 2m horizontal precision
• A-GPS compatible
• Active/passive antennas supported
• 3.3V operation
• Tracking mode current draw @ 1Hz -> 5mA
• Dimensions 10 x 9.6 x 2.2 mm
• Weight 0.6g
• Price 59€ @1pc (€12.63 @100pcs)

http://www.u-blox.com/images/downloads/Product_Docs/MAX-7_DataSheet_(GPS.G7-HW-12012).pdf

We´ll also use a LNA amplifier suitable for GNSS band (MAX2659) and a chip antenna (AF816M157502-T)

LNA datasheet: http://www.mouser.com/ds/2/256/MAX2659-74449.pdf

antenna datasheet: AF 816M157502 Spec

GPS Schematics

GPS - Speaker

We´ll use a 12mm diameter, 0,7g weight speaker (254-PS600-RO)
http://www.mouser.com/ds/2/209/KT-400402-194153.pdf

Price: $2.58 @ 1pc ($1.78 @ 100pcs)

As we just need to play some low quality tone alerts, we´ll use the simplest one-transistor amp driven from a MCU GPIO.

Speaker schematics

GPS - Buttons

We´ll use right angle tactile pushbuttons mounted on pcb edge
http://www.alps.com/products/WebObjects/catalog.woa/E/HTML/Tact/SurfaceMount/SKSL/SKSLLAE010.html
http://es.mouser.com/ProductDetail/ALPS/SKSLLAE010/?qs=sGAEpiMZZMsgGjVA3toVBNCaPNgfU%252bJCTYCpZkB%252bZDs%3d

Price: $0.286 @ 1pc ($0.23 @ 100pc)

Buttons Schematics

GPS - LCD Schematics

LCD schematics

Backlight schematics

For the lcd backlight, i´ll be using 4 white 1206 sized leds driven by PWM output from the MCU.

Leds will be mounted directly on the main pcb on the back of the lcd panel. 

GPS - Screen selection

I´ve been looking at some options for the e-paper LCD panel. Probably the best option, considering price, availability and quality is one from Sharp´s Memory LCD lineup (http://www.sharpmemorylcd.com)

Memory LCD de 2.7" (LS027B7DH01)
Price: $37.16 @ 1pc ($26.80 @ 100pcs)
Product Specification: http://www.sharpmemorylcd.com/resources/LS027B7DH01_Spec.pdf
Mouser link: http://es.mouser.com/ProductDetail/Sharp-Microelectronics/LS027B7DH01/?qs=sGAEpiMZZMvEZpvz4iUm3h4lv3%252bqmbbZ

Connector:

FP12

0.5mm pitch

10 pins

Price: $1.13 @ 1pc ( $0.843 @ 100pcs)

We´ll use http://www.mouser.com/ds/2/307/XF2M_1110-32350.pdf

Power requirements:

We´ll need to provide 5VDC to the panel.

We´ll use a single 5V bus VDDA=VDD.

Panel power requirement is 50uW aprox (5V @ 10uA aprox) with static image and 175uW (5V @35uA) refreshing at 1Hz

Worst case scenario would be 350uW refreshing at 1Hz. As we want to refresh at 2Hz we´ll assume  700uW.

In other words, 5V @ 140uA. 

So the panel would require 3.36mAh (at 5V) to operate 24h. Perhaps 10mAh at the battery (3.7V) considering level conversion efficiency.

Controller requirments:

Panel will happily take data bus at  3.3V

It would need SPI + 2 GPIO from the mcu

MCU SPI SDO -> LCD SI

MCU SPI SCK( 1 MHz )  -> LCD SCLK

MCU SPI CS -> LCD SCS

MCU GPIO1 (with weak pulldown) -> LCD DISP 

MCU GPIO2 (with weak pulldown) -> LCD EXTCOMIN

LCD EXTMODE -> VDD