Week 11

On week 11, I continue research to find more detailed information about the components and hardware that will be used for this project.

Ultrasonic

HC-SR04

Ultrasonic ranging module HC - SR04 provides 2cm - 400cm non-contact measurement function, the ranging accuracy can reach to 3mm. The modules includes ultrasonic transmitters, receiver and control circuit. The basic principle of work:

1.  Using IO trigger for at least 10us high level signal.
2. The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back.
3.  IF the signal back, through high level , time of high output IO duration is the time from sending ultrasonic to returning.

Test distance = (high level time×velocity of sound (340M/S) / 2,

Specification:

• Working Voltage: DC 5V
• Working Current: 15mA
• Working Frequency: 40Hz
• Max Range: 4m
• Min Range: 2cm
• Measuring Angle: 15 degree
• Trigger Input Signal: 10µS TTL pulse
• Echo Output Signal Input TTL lever signal and the range in proportion
• Dimension 45 * 20 * 15mm

GPS (Global Positioning System)

SKM53 GPS Starter Kit

The SkyNav SKM53 Series with embedded GPS antenna enables high performance navigation in the most stringent applications and solid fix even in harsh GPS visibility environments.

It is based on the high performance features of the MediaTek 3329 single-chip architecture, Its –165dBm tracking sensitivity extends positioning coverage into place like urban canyons and dense foliage environment where the GPS was not possible before. The 6-pin UART connector design is the easiest and convenient solution to be embedded in a portable device and receiver like PND, GPS mouse, car holder, personal locator, speed camera detector and vehicle locator.

 

Applications: LBS (Location Based Service) Vehicle navigation system PND (Portable Navigation Device) GPS mouse and Bluetooth GPS receiver Timing application

 

     Features:

·         Ultra high sensitivity: -165dBm

·         22 tracking/66 acquisition-channel receiver

·         WAAS/EGNOS/MSAS/GAGAN support

·         NMEA protocols (default speed: 9600bps)

·         Internal back-up battery

·         One serial port

·         Embedded patch antenna 18.2 x 18.2 x 4.0 mm

·         Operating temperature range: -40 to 85℃

·         RoHS compliant (Lead-free)

·         Tiny form factor ：30mm x20mm x 8.5mm