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--- doc:appunti:hardware:raspberry_explorer [2018/10/15 17:01] – [Web References] niccolo
+++ doc:appunti:hardware:raspberry_explorer [2018/11/26 09:42] (current) – [Time Syncronization with GPS and NTP] niccolo
@@ Line 42: / Line 42: @@
 {{ .:raspberrypi:raspberry_pi_cam_miuzei_ov5647.jpg?direct&180|Image captured by the OV5647 camera}}
 The camera mounted in our kit is based on the **OV5647 sensor**, capable of 2592x1944 pixels (**5 Mpixels**). The camera has a **wide viewing angle** of 175°. The camera requires a **manual focus adjust**, turning the lens mount clockwise or counerclockwise. The focus resulted a bit critical: trying to focus to infinity it resulted that the mere rotation of 1/16 of a turn, can **mess-out the focus** very badly. Also the quality of the pictures is **not exceptional**, they miss the crisp level that we would expect from a 5 Mpixels sensor.
+===== Other Sensors =====
+{{.:raspberrypi:sensors-front.jpg?direct&500|Misc sensors: GPS, Accel & Gyro, Magnetic, Pressure}}
+{{.:raspberrypi:sensors-back.jpg?direct&500|Sensor's Back Side}}
+  * **GPS u-blox NEO-6**
+  * **GY-521: MPU-6050 Accelerometer and Gyroscope**
+  * **GY-273: QMC5883L 3-Axis Magnetic Sensor**
+  * **GYBMEP: BME280 pressure, humidity and temperature sensor**
 ===== Software Setup =====
@@ Line 226: / Line 237: @@
 I use **gpxlogger** (from the **gpsd-clients** Debian package) to acquire track logs from the GPS. It seems that the program has a bug handling the **%%-f%% option**, sometimes it crashes with the error //free(): invalid next size (fast)//. I opened [[https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=909082|bug #909082]] on Debian. Changing the file name to be created, is a workaround for this problem.
+===== GPS u-blox NEO-6 =====
+{{.:raspberrypi:neo-6m-gps.jpg?direct&180|u-blox NEO-6 GPS with small antenna}}
+{{.:raspberrypi:neo-6m-gps_back.jpg?direct&180|u-blox NEO-6 GPS back view}}
+A cheap alternative to the Adafruit Ultimate GPS HAT is the **u-blox NEO-6 GPS** module. It has a serial interface and a pin to carry the PPS signal.
+^ u-blox  ^ Raspberry Pi                ^
+| 1 VCC   | PIN 2 - 5V                  |
+| 2 GND   | PIN 6 - GND                 |
+| 3 TXD   | PIN 10 - GPIO#15 UART0_RXD  |
+| 4 RXD   | PIN 8 - GPIO#14 UART0_TXD   |
+| 5 PPS   | PIN 7 - GPIO#7              |
 ===== Time Syncronization with GPS and NTP =====
@@ Line 254: / Line 280: @@
 </file>
-At the next reboot you should read the following kernel logs via **dmesg**:
+At the next reboot the kernel modules **pps_core** and **pps_gpio** will be loaded and you should read the following kernel logs via **dmesg**:
 <code>