Here are the key components of our system.

  1. 20 Channel EM-406A SiRF III Receiver with Antenna

    -20-Channel Receiver
    -Extremely high sensitivity : -159dBm
    -10m Positional Accuracy / 5m with WAAS
    -Hot Start : 1s
    -Warm Start : 38s
    -Cold Start : 42s
    -70mA at 4.5-6.5V
    -Outputs NMEA 0183 and SiRF binary protocol

    We chose this unit because it is light weight, small, and relatively inexpensive for a GPS unit. However, even though it is inexpensive, it is pretty accurate. Being accurate within 10m (roughly 32ft) may seem inaccurate, but for a non-military commercial grade product, it is pretty good.

  2. Arduino Uno R3

    -ATmega328 microcontroller
    -Input voltage – 7-12V
    -14 Digital I/O Pins (6 PWM outputs)
    -6 Analog Inputs
    -32k Flash Memory
    -16Mhz Clock Speed

    The Arduino is relatively simple to use, but more importantly, it works very well with the GPS unit. It is also relatively easy to program, has low power consumption, and can do all the calculations necessary to determine the ETA.

  3. Satel Satteline 3-ASd

    The radio modem operates at 468.2MHz frequency. The 3-ASd can be used to transmit data after an operating license is applied for with the FCC(Federal Communications Commission). The 3-ASd is tough and reliable, but more importantly, it can transmit the entire distance of the campus shuttle’s route when the antenna for the radio modem is properly configured and placed in an optimal location.

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