Raspberry Pi Forums

PiGraham

Without question this is a very difficult problem to solve. To me, I don't agree with some of these sensors being called a compass when they are so inaccurate +- 2.5 degrees is a substantial error. It's probably better than a person or a vehicle can steer. Undulations in the road, flex in the tyres...

PiGraham

In answer to some of the great comements: My RPI 4 will be running an ALPR on a road running through a forest with very limited sun. It requires quite a bit of juice and is never in a low power idle status. Upon boot, ALPR will either join a known wireless network or create it's own AP. The PiZero ...

PiGraham

Vectronix claim sub 1° accuracy for their ULTISENSE modules.
https://www.safran-vectronix.com/product/dmc-sx-5000/

"military and civil applications" might mean high price and / or limited availability.

PiGraham

What the geomagnetic sensor does give you is no drift. Dead reckoning or accelerometers accumulate error whereas the Earth's magnetic field, or better, GPS satellites, give an absolute frame of reference. A possible alternative is to build a local frame of reference. Put markers or beacons in known ...

PiGraham

You say that none of five digital compasses (geomagnetic sensor) is "reliable enough". What performance are you getting? Do you have a calibration problem, or a calculation problem or noisy data? Do you get the performance you expect using a compass app for your phone? You aren't likely to do better...

PiGraham

The real issue with hubs is that they should not try to "backfeed" power to their up-stream connection. That may be a real problem with some hubs, possibly bad for the powering a Pi, but is it the problem the OP has? Why would a back feeding hub not work as a hub? Does it somehow disable the hub it...

PiGraham

It really is a quite profound voltage problem - as connecting the USB hub to either USB2 or USB3 causes the 3.3v fan to stop spinning. I dread to think what is happening to the board's voltages and ground. As I mentioned, the previous versions of the RPi don't exhibit this problem so I hope the des...

PiGraham

pcmanbob wrote: ↑
Sat Apr 18, 2020 9:19 am
we do it by changing the direction we read the list of gpio output states.

That is a cleaner way to do it

PiGraham

On the other hand this guy claims to achieve it by simply coping the previous stepper motor code and changing the GPIO pins assignments. http://jumpstation.co.uk/flog/Mar2014.html#190320142109 It looks like he's using a breadboard, which I don't need as my pi is a 3 Model A+. Also I don't understan...

PiGraham

On the other hand this guy claims to achieve it by simply coping the previous stepper motor code and changing the GPIO pins assignments. http://jumpstation.co.uk/flog/Mar2014.html#190320142109 It looks like he's using a breadboard, which I don't need as my pi is a 3 Model A+. Also I don't understan...

PiGraham

This is the Radio I Have: Dual Electronics XDVD176BT 7" LED Backlit Touchscreen LCD Single DIN Car Stereo Long story short I dont know what I need to make touch Steering Wheel Controls. Could someone point me in the right direction? That unit has a remote control. Probably infrared. If so you could...

PiGraham

Hi, I was wondering if anyone has come across a way to remotely extend access to the micro-sd card for the Pi? The application would be if you have your Pi in a difficult to get to area, you could still access the micro-sd card. I'm talking about the onboard one, not one using a USB adapter. Perhap...

PiGraham

Yes it is. It's a new feature of the Pi4 called OTG. See: https://www.raspberrypi.org/forums/viewtopic.php?t=243966 The problem will be powering the Pi4 when it's connected to a PC USB port. While the Pi Zero can easily be configured as a USB Gadget, it's power requirements are minimal and it can r...

PiGraham

As above, NOIR camera is "near IR" not at all the same as a "thermal camera". It will pickup the glow of a soldering iron >200°C but nothing cooler than that.

PiGraham

I'm not that familiar with MQTT. If the requirement is to both parse new values and also keep a permeant log of values is that something MQTT can do automatically or would you create another archiving process to subscribe and log values to file? I see a message persistence feature that may be releva...

PiGraham

https://www.youtube.com/watch?v=MQ6MhoB3PEU

PiGraham

You might consider using filesystem change monitoring to only run code when your target file has changed.

fswatch command line utility
http://emcrisostomo.github.io/fswatch/doc/1.14.0/

Or inotify API
http://man7.org/linux/man-pages/man7/inotify.7.html

PiGraham

I had better luck with Googlr Hangouts. Two way video but also laggy and low frame rate.

PiGraham

Thank you very much for the links, as soon as I can I will read them to get ideas and use them in the project, I hope they will be useful. Actually I'm looking for more at the software level than the hardware implementation since my career is as a software engineer. You must understand what hardwar...

PiGraham

Duo on 3B+ unusably laggy

PiGraham

Maybe Google Duo in the browser (app for Android/IOS)?

https://www.raspberrypi.org/blog/video- ... oogle-duo/

PiGraham

Have you confirmed the analog values are good as you move the joystick? Are your servos control values correct? Have you tested minimal code to move the servos on their own? If that fails check your wiring and power to the servos. gpiozero seems to be preferred over RPI.GPIO now. It has a class for ...

PiGraham

good suggestion but unfortunatly an old laminating machine is used where only the drive part is used. The only option on the machine is backwards/forwards and start/stop. That could be a problem. You could test it using mark sensor (aka line following sensor). Put a black mark on the foil (or use w...

PiGraham

My logic behind the start stopping multiple threads would be that there are less if else statements, so if the user selects mode 1: mode 1 starts and waits till pulse count is met then stops the mode and waits for user input. same goes with the other modes but a different counting method is used or...

PiGraham

I don't know. Have you tried?

It's a Teensy issue so you could try the Teensy forums.

Search found 3929 matches

Re: Reliable means of determining directional heading...

Re: Long term powering of Raspberry pi 4B in remote forest

Re: Reliable means of determining directional heading...

Re: Reliable means of determining directional heading...

Re: Reliable means of determining directional heading...

Re: Raspberry Pi 4 - And powered USB hubs - any fixes?

Re: Raspberry Pi 4 - And powered USB hubs - any fixes?

Re: Stepper 288yj-48 - stop and restart from the latest position

Re: Stepper 288yj-48 - stop and restart from the latest position

Re: Stepper 288yj-48 - stop and restart from the latest position

Re: Steering Wheel Controls Help

Re: Remote micro-sd card?

Re: Is it possible to connect to a PC using the USB-C port on Raspberry Pi 4?

Re: Is anybody using a NOIR camera to spot fever/covid?

Re: Poor practice to read from .txt file multiple times a minute?

Re: Controlling Robot Arm Toy

Re: Poor practice to read from .txt file multiple times a minute?

Re: Video Chat on the Raspberry 4

Re: Looking for a smart garbage project for my school

Re: Video Chat on the Raspberry 4

Re: Video Chat on the Raspberry 4

Re: Controlling two servos with joystick

Re: starting and stopping thread in other class

Re: starting and stopping thread in other class

Re: Wirelessly receive and compile teensy/arduino code