88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/*
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Powering off a ublox GPS module
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By: bjorn
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unsurv.org
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Date: July 20th, 2020
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License: MIT. See license file for more information but you can
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basically do whatever you want with this code.
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This example shows you how to turn off the ublox module to lower the power consumption.
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There are two functions: one just specifies a duration in milliseconds the other also specifies a pin on the GPS device to wake it up with.
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By driving a voltage from LOW to HIGH or HIGH to LOW on the chosen module pin you wake the device back up.
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Note: Doing so on the INT0 pin when using the regular powerOff(durationInMs) function will wake the device anyway. (tested on SAM-M8Q)
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Note: While powered off, you should not query the device for data or it might wake up. This can be used to wake the device but is not recommended.
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Works best when also putting your microcontroller to sleep.
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Feel like supporting open source hardware?
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Buy a board from SparkFun!
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ZED-F9P RTK2: https://www.sparkfun.com/products/15136
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NEO-M8P RTK: https://www.sparkfun.com/products/15005
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SAM-M8Q: https://www.sparkfun.com/products/15106
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Hardware Connections:
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Plug a Qwiic cable into the GPS and a BlackBoard.
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To force the device to wake up you need to connect to a pin (for example INT0) seperately on the module.
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If you don't have a platform with a Qwiic connection use the SparkFun Qwiic Breadboard Jumper (https://www.sparkfun.com/products/14425)
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Open the serial monitor at 115200 baud to see the output
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*/
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#include "SparkFun_Ublox_Arduino_Library.h" //http://librarymanager/All#SparkFun_u-blox_GNSS
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// define a digital pin capable of driving HIGH and LOW
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#define WAKEUP_PIN 5
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// Possible GNSS interrupt pins for powerOffWithInterrupt are:
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// VAL_RXM_PMREQ_WAKEUPSOURCE_UARTRX = uartrx
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// VAL_RXM_PMREQ_WAKEUPSOURCE_EXTINT0 = extint0 (default)
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// VAL_RXM_PMREQ_WAKEUPSOURCE_EXTINT1 = extint1
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// VAL_RXM_PMREQ_WAKEUPSOURCE_SPICS = spics
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// These values can be or'd (|) together to enable interrupts on multiple pins
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void wakeUp() {
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Serial.print("-- waking up module via pin " + String(WAKEUP_PIN));
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Serial.println(" on your microcontroller --");
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digitalWrite(WAKEUP_PIN, LOW);
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delay(1000);
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digitalWrite(WAKEUP_PIN, HIGH);
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delay(1000);
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digitalWrite(WAKEUP_PIN, LOW);
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}
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void setup() {
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pinMode(WAKEUP_PIN, OUTPUT);
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digitalWrite(WAKEUP_PIN, LOW);
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Serial.begin(115200);
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while (!Serial); //Wait for user to open terminal
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Serial.println("SparkFun Ublox Example");
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Wire.begin();
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//myGPS.enableDebugging(); // Enable debug messages
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if (myGPS.begin() == false) //Connect to the Ublox module using Wire port
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{
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Serial.println(F("Ublox GPS not detected at default I2C address. Please check wiring. Freezing."));
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while (1);
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}
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// Powering off for 20s, you should see the power consumption drop.
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Serial.println("-- Powering off module for 20s --");
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myGPS.powerOff(20000);
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//myGPS.powerOffWithInterrupt(20000, VAL_RXM_PMREQ_WAKEUPSOURCE_EXTINT0);
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delay(10000);
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// After 10 seconds wake the device via the specified pin on your microcontroller and module.
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wakeUp();
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}
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void loop() {
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//Do nothing
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}
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