High Accuracy Cheap UVA DVR Digital Video Recording
Car Tracker Marine NMEA 0183 MT3337
UART/TTL G-Mouse GPS Receiver Module
-The GPS Receiver Module we are going to ship is based on the below default.
-For your customized requirements on the GPS receiver module, like connector type, pin assignment, cable length, main chip, baud rate, ect, please kindly contact us before purchasing.
The GPS receiver module default is as below:
-Pin Assignment (as per the drawing below)
-Baud Rate: 9600bps
-UVA(unmanned aerial vehicle)
-DVR(Digital Video Recording)
-Rearview Mirror DVR
-Handheld GPS Device
-Outdoor GPS Equipment
The HR-2525-MTR is a complete GPS engine module that features super sensitivity, ultra low power and small form factor. The GPS signal is applied to the antenna input of module, and a complete serial data message with position, velocity and time information is presented at the serial interface with NMEA protocol or custom protocol.
Its –165dBm tracking sensitivity extends positioning coverage into place like urban canyons and dense foliage environment where the GPS was not possible before. The small form factor and low power consumption make the module easy to integrate into portable device like DVR, UVA, Car trackers and PNDs.
Regulated power for the HR-2525-MTR is required. The VCC Pin Need a stable DC voltage supply. Power supply ripple must be less than 30mV. The input voltage Vcc should be 3.0V~5.0V, Recommended power supply voltage is 3.3V . maximum current is 28mA. Suitable decoupling must be provided by external decoupling circuitry.
1.3 UART Ports
The module supports two full duplex serial channels UART. All serial connections are at 3V CMOS logic levels, if need different voltage levels, use appropriate level shifters. The baud rate of both serial ports are fully programmable, the data format is however fixed: X, N, 8, 1, i.e. X baud rate, no parity, eight data bits and one stop bit, no other data formats are supporTED, LSB is sent first. The modules default baud rate is set up 9600bps, however, the user can change the default baud rate to any value from 4800 bps to 115kbps. UART port can be used for firmware upgrade, NMEA output and PMTK proprietary commands input.
The module is equipped with a 4-pin 1.25mm spacing connector that connects to your application platform. The HR-2525-MTR module It consists of a MediaTek MT3337 single chip GPS IC which includes the RF part and Baseband part, a patch antenna, a LNA, a SAW filter, a TCXO, a crystal oscillator, Also comes with a 0.22F crystal capacitor ,can backup satellite ephemeris about 2 hour.
2.1. Pin Assignment
CON Pin Description
RTC Battery Input
Voltage range: 1.5V~4.3V
Module Power Supply
Voltage range: 3.0V~5.0V
UART Serial Data Output
UART Serial Data Input
2.2 Mechanical Dimensions
This chapter describes the mechanical dimensions of the HR-2525-MTR module. Size unit(mm)
Figure 3: Specification size chart
3 NMEA 0183 Protocol
The NMEA protocol is an ASCII-based protocol, Records start with a $ and with carriage return/line feed. GPS specific messages all start with $GPxxx where xxx is a tHRee-letter identifier of the message data that follows. NMEA messages have a check sum, which allows detection of corrupTED data transfers.
The HR-2525-MTR supports the following NMEA-0183 messages: $GPGGA, $GPGLL, $GPGSA, $GP GSV, $GPRMC and $GPVTG.