View source for GP-20U7

The GP-20U7 GPS receiver is a compact solution for getting global position data. It is capable of delivering position, velocity, and time data. The low power consumption and its small size make the GP-20U7 the ideal choice for small, portable projects like smartwatches.

== Technical Specifications ==
* 56-Channel Receiver (22 Channel All-in-View)
* Sensitivity : -162dBm
* 2.5m Positional Accuracy
* Cold Start : 29s (Open Sky)
* 40mA @ 3.3V
* 3-pin JST Terminated Cable

=== Pins ===
{| class="wikitable" style=""

|-
! Pin # !! Name !! Description
|-
| 1 || RX || UART Serial Data Input
|-
| 2 || TX || UART Serial Data Output
|-
| 3 || GND || Ground
|-
| 4 || VCC || Power Supply (3.3V)
|}

== Connecting the GP-20U7 ==
* Connect '''VCC''' to the '''power supply''' (3.3V)
* Connect '''GND''' to the '''ground'''
* Connect '''TX''' to a '''RX pin'''
* Connect '''RX''' to a '''TX pin''' (not necessary for read position data only)

In our example, we use a Raspberry Pi 3 with '''VCC''' connected to '''3V3(OUT)''' (Pin 1), '''GND''' connected to '''GND''' (Pin 9) and '''TX''' connected to '''GPIO15''' (Pin 10) which is an UART-Pin.

== Code Examples ==

=== Get data from the GP-20U7 ===
<syntaxhighlight lang="python" line='line'>
# Source: https://forum.sparkfun.com/viewtopic.php?t=45669

import serial

# Initialize serial
ser = serial.Serial(port='/dev/ttyS0', baudrate=9600, timeout=None,parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE,rtscts=False,xonxoff=False,dsrdtr=False) # 9600bps, 8 bit data, 1 stop bit, no parity

while True :
    data=ser.readline().decode("utf-8")
    print(data)
</syntaxhighlight>

=== Make the output more human readable ===
<syntaxhighlight lang="python" line='line'>
# Source: https://forum.sparkfun.com/viewtopic.php?t=45669

import serial

# Initialize serial
ser = serial.Serial(port='/dev/ttyS0', baudrate=9600, timeout=None,parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE,rtscts=False,xonxoff=False,dsrdtr=False) # 9600bps, 8 bit data, 1 stop bit, no parity

while True :
    w = ser.readline().decode("utf-8")
    data = w.split(',')
    if data[0] == '$GPGGA':
        msgID,UTC,Latitude,NSindicator,Longitude,EWindicator,PosFixInd,NbSatellites,HDOP,Altitude,Units,Gsep,Units,w,checksum = data
        hh = UTC[0:2]
        mm = UTC[2:4]
        ss = UTC[4:6]
        print('UTC time = %s:%s:%s, Latitude = %s%s, Longitude = %s%s, altitude = %s%s, %s satellites' % (hh,mm,ss,Latitude,NSindicator,Longitude,EWindicator,Altitude,Units,NbSatellites))
</syntaxhighlight>

[[Category:Sensor]]