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by blimpyway
Fri May 31, 2019 10:25 pm
Forum: Automation, sensing and robotics
Topic: Thruster testing & data acquisition project
Replies: 1
Views: 161

Re: Thruster testing & data acquisition project

Your requirements are vague so is the advice: - read documentation for whatever sensors and control devices are already there. - find code examples of PI/Arduino used to read/control same or similar purpose/protocol sensors and/or output devices. - write down exact input/output and behaviour needed ...
by blimpyway
Fri May 31, 2019 8:30 pm
Forum: Other projects
Topic: aeroplane live feed to ground
Replies: 4
Views: 337

Re: aeroplane live feed to ground

You would have better luck searching for RC FPV cameras/ radio equipment for drones.
by blimpyway
Fri May 31, 2019 8:19 pm
Forum: Automation, sensing and robotics
Topic: Commercial 3d stereo vision product?
Replies: 4
Views: 333

Re: Commercial 3d stereo vision product?

I mentioned mathematica just as an example of proprietary commercial code available on PI which uses a licensing model that encourages people to test/learn/develop with it without having to purchase it. You still can have the option of bundling a cm3 module with cameras and your software if you thin...
by blimpyway
Thu May 30, 2019 10:22 am
Forum: Automation, sensing and robotics
Topic: Commercial 3d stereo vision product?
Replies: 4
Views: 333

Re: Commercial 3d stereo vision product?

If you don't make any hardware you can also consider a licensing scheme for your software/libraries only.

e.g. wolfram/mathematica is free to use on PI for educational, non-commercial purposes and whoever wants to use it in a commercial product should pay a commercial license.
by blimpyway
Thu May 16, 2019 8:15 pm
Forum: Automation, sensing and robotics
Topic: Powering Raspberry Pi Zero W and 3 steppers motors
Replies: 2
Views: 219

Re: Powering Raspberry Pi Zero W and 3 steppers motors

A car usb charger will use a tiny fraction of the 12V source (needed for steppers) to power the Zero too.

And yes, the LM2576 is ok too
by blimpyway
Thu May 16, 2019 8:12 pm
Forum: Other projects
Topic: Object Detection
Replies: 5
Views: 428

Re: Object Detection

Yeah makes more sense to just make a big batch of photos of the building on SD then process them on a properly sized CPU/GPU combo for your problem. If video link image is good enough you can use a beefy pc/laptop on ground for object detection in real time. But this does not seem a problem with rea...
by blimpyway
Sun May 12, 2019 8:23 am
Forum: Other projects
Topic: Object Detection
Replies: 5
Views: 428

Re: Object Detection

A time ago I have downloaded and compiled darknet as described here https://pjreddie.com/darknet/yolo/ On a Pi 3 A+, having only 512MB memory, it could only run the tiny variants of yolo v2, v3 It worked but much slower than what I expected from some youtubes where it got ~1fps PS: I assume you have...
by blimpyway
Thu May 02, 2019 10:49 am
Forum: Automation, sensing and robotics
Topic: Sprint Timer
Replies: 10
Views: 585

Re: Sprint Timer

A human can't radically change its speed in 33ms, specially if it is close to its maximum. Even at 30fps, by analysing a couple frames before and after finish line, one (program or human) can accurately compute average acceleration, speed and moment of passing past the line of a moving object. Yet e...
by blimpyway
Thu May 02, 2019 10:16 am
Forum: Automation, sensing and robotics
Topic: Sensing an object on a plastic surface
Replies: 3
Views: 233

Re: Sensing an object on a plastic surface

You could try camera / OpenCV to visually track the puck, specially if it has a certain color not "available" elsewhere in the frame. And will probably be cheaper than a sensor array solution. With a laser pointer + two servos you might even be able to dispense with the led matrix and use any slippe...
by blimpyway
Thu Apr 18, 2019 8:20 pm
Forum: Other projects
Topic: Power supply for mobile project.
Replies: 3
Views: 255

Re: Power supply for mobile project.

The projector alone, at 270W, will depelete a 48Wh battery in 48 Wh/270W = 0.1777 h = 10 minutes and 40 seconds.
by blimpyway
Thu Apr 18, 2019 8:13 pm
Forum: Other projects
Topic: EDS
Replies: 1
Views: 152

Re: Excavator Depth Sensor

An IMU includes XYZ accelerometers which you can use to measure inclination, I do not know how suitable are they for your problem. In order to have some accuracy, it needs to measure when not moving, which means must stop for a second (or even less) the cup in lowest position to get a correct (or at...
by blimpyway
Thu Apr 11, 2019 9:49 am
Forum: Networking and servers
Topic: Connecting an Xbee Pro Module to a Raspberry Pi Zero W
Replies: 1
Views: 123

Re: Connecting an Xbee Pro Module to a Raspberry Pi Zero W

xbees just provide an "wireless wire" serial . That means you use normal UARTs to communicate and xbee pair replaces the actual cable. The module you linked to is no more than an USB to serial adapter which: - is needed by devices which do not have a TTL level serial port but have USBs. More exactly...
by blimpyway
Wed Apr 10, 2019 11:59 am
Forum: Automation, sensing and robotics
Topic: Defining Gps Area
Replies: 5
Views: 256

Re: Defining Gps Area

omegaman477 wrote:
Tue Apr 09, 2019 2:25 pm
...

This Python Library will handle the bulk of the cartesian and Sexagesimal mathematics required. There are similiar libraries for most languages and O/s
...and the library is.. which one?
by blimpyway
Wed Apr 10, 2019 11:44 am
Forum: Automation, sensing and robotics
Topic: DS18B20 network issues after 2 months stable
Replies: 5
Views: 291

Re: DS18B20 network issues after 2 months stable

That totals almost 60meters of cable for a single 1 wire loop. If any problem happens anywhere (interference, bad contact, leakage) it not only affects all sensor readings but it also is quite hard to find it. Split them as you can to get the shortest lines possible, try even 3 loops instead of 2 Th...
by blimpyway
Wed Apr 10, 2019 11:08 am
Forum: Python
Topic: I can't get a process tell me when I'm done using While "p.poll() == None"
Replies: 2
Views: 118

Re: I can't get a process tell me when I'm done using While "p.poll() == None"

That's not a problem of poll() but time.sleep() who does the locking of the whole interpreter. If tk buttons is what you-re complaining about, see this discussion here https://stackoverflow.com/questions/18038604/interacting-with-tkinter-window-during-a-long-process It's a not an issue to be "solved...
by blimpyway
Wed Apr 10, 2019 10:48 am
Forum: Python
Topic: serial readings to tkinter lable?
Replies: 7
Views: 1144

Re: serial readings to tkinter lable?

The b'...' is printed because serial reads in bytes instead of string. So the print function puts b'' just to make you aware you-re printing a bytes type object. the \r and \n have already been explained. You can use strip() to remove leading & trailing newlines and spaces then decode() to convert a...
by blimpyway
Mon Apr 01, 2019 12:22 pm
Forum: Python
Topic: trigger camera from gpio input pulse
Replies: 5
Views: 250

Re: trigger camera from gpio input pulse

If you want your setup to be more flexible you can let arduino print measured speeds on its serial line and have the actual speed threshold set in Pi's python code. So you don't need to re-compile & upload arduino code when you want to change the speed level for camera trigger.
by blimpyway
Mon Apr 01, 2019 12:08 pm
Forum: Python
Topic: PiCamera and DC Motor using MultiProcessing
Replies: 5
Views: 248

Re: PiCamera and DC Motor using MultiProcessing

It could be the camera is opened in main process then there are created (through system's fork) two more processes with the same camera handle, and the camera library has some internal lock/protection against multiple processes accessing the camera instance. What happens if you move camera creation ...
by blimpyway
Fri Mar 29, 2019 9:13 pm
Forum: Automation, sensing and robotics
Topic: How best to control higher voltage relays with 12v/24v coils?
Replies: 26
Views: 1157

Re: How best to control higher voltage relays with 12v/24v coils?

You can either - look for relay modules which beside the relays themselves include whatever circuitry is needed to drive them with 3.3 or 5V low power signals, so they can be commanded directly - look for components/schematics which interface between PI's gpio lines and 12 or 24V relay coils. Most i...
by blimpyway
Fri Mar 29, 2019 4:54 pm
Forum: Automation, sensing and robotics
Topic: Making a night surveillance camera
Replies: 5
Views: 368

Re: Making a night surveillance camera

You have to check LED's current/voltage. Pi's gpio pins will only sink a few mA (15mA? not sure need to read the specs).

The 3W LEDs need a 700mA at 1.4-2.6V each. So no way a pi alone without a relay or power transistor could power them.
by blimpyway
Tue Mar 26, 2019 8:48 pm
Forum: Automation, sensing and robotics
Topic: Making a night surveillance camera
Replies: 5
Views: 368

Re: Finding the perfect camera setup for my future Home Assistant/Z-Wave Rasp Pi 3+ setup

You can find both wide angle (fish eye) variants of Pi cameras and you also can attempt to attach wide angle lenses to "normal" PI cameras, e.g. there are various clip-on lenses for phone cameras which could be used. ===== I'm not familiar with home assistant or z-wave. Motion eye is just a linux pa...
by blimpyway
Tue Mar 26, 2019 4:20 pm
Forum: Automation, sensing and robotics
Topic: Display postion (level with MPU6050) of a caravan in a web-app on a smartphone
Replies: 4
Views: 229

Re: Display postion (level with MPU6050) of a caravan in a web-app on a smartphone

I'm currently using a stack with python, gevent, flask, socketio on the Pi side and P5.js on the client side (e.g phone browser). Gevent is an async framework which gives python efficient realtime multitasking capabilities, needed since a single python process needs to serve static web content, to g...
by blimpyway
Tue Mar 26, 2019 2:00 pm
Forum: Automation, sensing and robotics
Topic: Display postion (level with MPU6050) of a caravan in a web-app on a smartphone
Replies: 4
Views: 229

Re: Display postion (level with MPU6050) of a caravan in a web-app on a smartphone

I'm not sure Pi is the right tool for such a narrow purpose device. This needs to be done once every few days with long periods of pause (months) in between. If you don't want PI to draw 200mA (on Pi ZeroW) all that time you need a button somewhere to turn it on/off. Turning it on means also wait Pi...
by blimpyway
Tue Mar 26, 2019 1:44 pm
Forum: Automation, sensing and robotics
Topic: Making a night surveillance camera
Replies: 5
Views: 368

Re: Finding the perfect camera setup for my future Home Assistant/Z-Wave Rasp Pi 3+ setup

Most "natural" camera for PI is a PI camera. And unlike generic USB cams is light on CPU since a lot of image processing is integrated in GPU. "perfect" for this case could be the one that is known to integrate with Pi and is cheap to get. ----- Search for pi motion eye, motioneye os. You can do mor...
by blimpyway
Tue Mar 26, 2019 1:17 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi, Arduino and I2C
Replies: 5
Views: 371

Re: Raspberry Pi, Arduino and I2C

No, Arduino can safely work at 3.3V at 8MHz. There are 3.3V 8MHz Pro-minis. And any 5V 16MHz crystal Atmega328 arduino (UNO, Nano, ProMini) can be configured (via avrdude command line + ISP adapter) to run on its 8MHz internal oscillator. And there are people who even powered directly 5V/16MHz ardui...

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