Raspberry Pi Forums

mwilliams03

Any IMU can give you a decent heading, as long as it is calibrated for hard iron distortion and it or your cold includes tilt compensation;
https://www.youtube.com/watch?v=QGIiu2uOWeA

You could also look at uBlox's CellLocate for indoor positioning

mwilliams03

Here are a few examples of how to read the NMEA sentences using Python
https://ozzmaker.com/using-python-with- ... pberry-pi/

mwilliams03

the easiest way to do it is with raspi-config
http://ozzmaker.com/berrygps-setup-guide-raspberry-pi/

mwilliams03

You could also look at this to get some ideas, its a much more compact solution; It includes a GSM module and GPS module which has an inbuilt antenna; http://ozzmaker.com/wp-content/uploads/2019/06/BerryGPS-GSM-PiZero600.jpg We have written a guide for real-time tracking using Initialstate http://oz...

mwilliams03

libi2c-dev seems to have changed significantly in Buster. Buster now uses V4 , where as it was V3 in earlier version of Raspbian. i2c-dev.h in buster is only 75 lines, older Raspbian versions it was 330 Is this expected? an example function which is missing; static inline __s32 i2c_smbus_read_byte_d...

mwilliams03

here is some code to parse $GPRMC Source http://ozzmaker.com/using-python-with-a-gps-receiver-on-a-raspberry-pi/ import serial port = "/dev/serial0" def parseGPS(data): # print "raw:", data #prints raw data if data[0:6] == "$GPRMC": sdata = data.split(",") if sdata[2] == 'V': print "no satellite dat...

mwilliams03

Most of the these types TFTs use shift registers and ripple counters. If you look at the back of you TFT, some of the chips should have 74hc4040 or 74hc4094. And these are only rate for about 20Mhz. These means the Pi SPI needs to be running at a low frequency for them to work. And therefore, low FP...

mwilliams03

an IMU can be used, but it depends how accurate you need it to be. This is because of the noise these sensors make. " Your telescope isn't moving away from your observatory, so linear accelleration isn't needed. That's three down " This is sort of incorrect. The accelerate can also be used to measur...

mwilliams03

just add a comma at the end

Code: Select all

print ("HEADING  %5.2f \33[1;37;40m tiltCompensatedHeading %5.2f" % (heading,heading2)),

mwilliams03

Nice!
What is the actual frames per second if you had to update every LED?

I did something similar but had a problem with update speeds when I went above 1,024 LEDs. Below is 2,048 LEDs on one Pi

mwilliams03

you can download Open Street maps from here

http://maps9.navit-project.org/

Here is a good guide to get Navit up and running;
http://ozzmaker.com/navigating-navit-raspberry-pi/

mwilliams03

The Pi Hut.
I have purchased five Zeros from them (can only order one at a time) and all arrived to Sydney within 2-3 weeks.
I've never had an issue. The last one I purchased was a Pi Zero W.

mwilliams03

The link you posted works perfectly well for the LSM9DS0.

I haven't worked with the LSM9DS1, but if you look at the datasheet you see that the magnetometer is orientated differently than it is on the LSDM9DS0

mwilliams03

there is also fbcat. which will capture whatever is in the framebuffer

mwilliams03

I should have posted posted a link to all the code; https://github.com/mwilliams03/BerryIMU/tree/master/python-BerryIMU-gryo-accel-compass I also have a guide here; http://ozzmaker.com/berryimu/ What are the two first bus.write_byte_data() doing ? They enable the gyro and set the scale and ODR. CTRL...

mwilliams03

those raw values dont look correct. I merged my code into your code, i am using the LSM9DS0 it has different registers but the math is the same. The below code works for me. I removed all the accelerometer values as you are looking for the Z gyro rotation. There is no calibration, but you should be ...

mwilliams03

What is this for? oriY[i] = (oriY[i] - gapZ) * 245.0 / (65536 / 2) To get dps from the gyro, you need to multiple the raw by the sensitivity level in mdps (milli). The table in the datasheet shows for 2000dps it is 70 mdps. So your math would be. raw value x 0.07 = dps more info here; http://ozzmake...

mwilliams03

you could also try the calibration script on this page;

http://ozzmaker.com/enable-x-windows-on-piscreen/

mwilliams03

are you hitting the clock stretching bug?

More info;
http://www.advamation.com/knowhow/raspb ... c-bug.html

https://github.com/raspberrypi/linux/issues/254l

https://stackoverflow.com/questions/392 ... stretching

mwilliams03

The comments above are correct. However, if you are using the compass (magnetometer) to work out the heading.. then it shouldn't drift as it isn't tracked. It will be noisy, but it shouldn't drift. Is the BerryIMU flat? Or.. you are using the code with the tilt compensation? If the IMU is not rotate...

mwilliams03

you can also use evtest. This spits out raw touch events The below output is from my Official Touchscreen pi@raspberrypi:~ $ evtest No device specified, trying to scan all of /dev/input/event* Not running as root, no devices may be available. Available devices: /dev/input/event0: FT5406 memory based...

mwilliams03

I have some basic information here;

http://ozzmaker.com/testing-points-raspberry-pi/

If there is any detailed documentation out there.. I would love to see it.

mwilliams03

Here is some good code for both Pi and Arduino, short and easy. https://github.com/MikeOchtman/Pi_Arduino_I2C Beaware that there is a well known i2c bug on the Raspberry Pi to do with clock stretching. https://github.com/raspberrypi/linux/issues/254#issuecomment-217047171 http://www.advamation.com/k...

mwilliams03

[my two cents] I have used vi and Nano for a number of years, and then about 6 months ago I moved to Geany. I hated it at first, but now I much prefer it. much easier to work with when you have a number of files and copy and past is works great with a mouse. :D I use the X11-forwarding feature in Mo...

mwilliams03

Take a look at our screen PiScreen;
http://ozzmaker.com/product/piscreen-3- ... pberry-pi/

Works with all version of Pi

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