MIKROE-2704

      GPS 4 click PID: MIKROE-2704     GPS 4 click carries the L70 compact GPS module from Quectel. The click is designed to run on either 3.3V  or 5V power supply. It communicates with the target microcontroller over UART interface, with  additional functionality provided by the following pins on the mikroBUS™ line: PWM, AN, RST.    L70 module features L70, an SMD type module, brings the high performance of MTK positioning engine to the industrial applications with a compact profile, ultra low power consumption and fast positioning capability. Combining advanced AGPS called EASY™ (Embedded Assist System) and proven AlwaysLocate™ technology, L70 achieves the highest performance and fully meets the industrial standard. EASY™ technology ensures L70 can calculate and predict orbits automatically using the ephemeris data (up to 3 days) stored in internal RAM memory, so L70 can fix position quickly even at indoor signal levels with low power consumption. With AlwaysLocate™ technology, L70 can adaptively adjust the on/off time to achieve a balance between positioning accuracy and power consumption according to the environmental and motion conditions. How it works A constellation of satellites sends a continuous signal towards Earth. Onboard every satellite is an atomic clock, and all of them are synchronized, thanks to a reference time scale defined by the whole system. So, that the signals coming from the different satellites of the same constellation share the same reference time scale. The user wanting to use GPS to determine its position must have an antenna that receives the signals coming from the satellites, and a receiver that translates these signals. The antenna position will be deduced from the measurements of the time delay between the emission time (satellite) and the reception time (receiver) for at least 4 signals coming from different satellites. Specifications Type  GPS  Applications  Navigation devices based on GPS  On‐board  modules  Quectel's L70  Key Features  Ultra low power consumption in tracking mode, 12mA, High sensitivity, ‐ 165dBm@Tracking, ‐148dBm@Acquisition  Key Benefits  AlwaysLocate™, an intelligent controller of periodic mode  Interface  UART  Input Voltage  3.3V or 5V  Click board size  L (57.15 x 25.4 mm)  Pinout diagram This table shows how the pinout on GPS 4 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes  Pin  Pin  Notes    Module Force ON  FORCE ON  1  AN  Module Reset  PWM 16 STANDBY Module Standby  RST  2  RST  INT  15 NC  NC  3  CS  TX  14 TX  Module Transmit line   NC  4  SCK  RX  13 RX  Module Receive line  NC  5  MISO  SCL  12 NC  NC  6  MOSI  SDA  11 NC  Power supply  +3.3V  7  3.3V  5V  Ground  GND  8  GND  GND 9  GND          10 +5V  Power supply  Ground  Jumpers and settings Default  Position  Designator  Name  JP1  VCC‐ BCKP  JP2  VCCIO  ON  Default  Option  Description  VCC  BCKP Battery connection; unsolder when battery is  connected  3V3 Level selector    Buttons and LEDs Designator  Name  Type  Description  LD1  PWR  LED  Power Indication LED LD2  PPS  LED  GPS tracking indicator Programming Code examples for GPS 4 click, written for MikroElektronika hardware and compilers are available on Libstock. Code snippet The following code snippet shows the function that feeds the data into a buffer until the sentence is ready for parsing, and sets the appropriate flag when such event occurs. 01 void gnss_put( char input ) 02 { 03 static bool sentence_flag; 04 05 if( ( input != 'r' && input != 'n' ) && buffer_position < BUFFER_MAX ) 06 { 07 buffer[ buffer_position++ ] = input; 08 } 09 else if( input == 'r' ) 10 { 11 sentence_flag = true; 12 } 13 else if( input == 'n' && sentence_flag ) 14 { 15 buffer[ buffer_position ] = ''; 16 17 18 19 20 21 22 23 24 25 } buffer_position = 0; strcpypvt( process_buffer, buffer ); sentence_flag = false; process_flag = true; } else { buffer_position = 0; }                                                                    https://shop.mikroe.com/gps‐4‐click 8‐2‐17