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by blimpyway
Wed Aug 21, 2019 2:05 am
Forum: Other projects
Topic: Controling very narrow Laminer flow / water jets
Replies: 10
Views: 194

Re: Controling very narrow Laminer flow / water jets

or tiny solenoids moving tiny flaps which redirect droplets in a top, inner gutter (aka collection through)

Flap/valve actuation might be purely mechanical e.g. https://www.youtube.com/watch?v=lr8C-aqZFyI
by blimpyway
Wed Aug 21, 2019 1:39 am
Forum: Networking and servers
Topic: Run python script on the html web site
Replies: 1
Views: 84

Re: Run python script on the html web site

Browsers generally do not run python code. Whatever python examples you find online, they run on server and send execution results back in browser window. what happens in most general case is described here https://en.wikipedia.org/wiki/Common_Gateway_Interface which basically means the web server p...
by blimpyway
Wed Aug 21, 2019 1:17 am
Forum: Networking and servers
Topic: how do you switch wifi on a raspberry pi?
Replies: 7
Views: 448

Re: how do you switch wifi on a raspberry pi?

See what are the differences between "wpa file" and "wpa_supplicant.conf file" on google search. Those not knowing what they talk about, but needing to understand, get missdirected "I have the same problem, wtf is a wpa file?" .
by blimpyway
Tue Aug 20, 2019 4:06 pm
Forum: Networking and servers
Topic: Using Pi 3 as IoT server w/ web app interface
Replies: 8
Views: 268

Re: Using Pi 3 as IoT server w/ web app interface

I'd like to set up my raspberry pi 3 to act as an IoT management hub for a thermostat and some other home automation things I'm making with arduinos. I'm connecting the arduinos to the Pi via BLE. I'd like to be able to access the pi via a web portal so that I can issue commands and view graphs. Th...
by blimpyway
Mon Aug 19, 2019 10:35 pm
Forum: Networking and servers
Topic: second wifi in zero w (sometimes)
Replies: 7
Views: 281

Re: second wifi in zero w (sometimes)

I’m afraid the blimp advertises more than it can hold... I don’t know which of the driver, firmware, hardware would require modifications to make virtual AP work reasonably, but it barely works and it’s been like that for ever. I think you can safely buy an extra usb dongle. ... From the problems I...
by blimpyway
Mon Aug 19, 2019 10:14 pm
Forum: Networking and servers
Topic: second wifi in zero w (sometimes)
Replies: 7
Views: 281

Re: second wifi in zero w (sometimes)

you can also look at comitup https://github.com/davesteele/comitup this one is a bit simpler - it just turns the Pi in AP and runs a simple web page that scans for wifi routers and lets you pick one as default connection. Afterwards it turns the wifi interface in station mode and the default Pi/comi...
by blimpyway
Mon Aug 19, 2019 9:36 pm
Forum: Networking and servers
Topic: second wifi in zero w (sometimes)
Replies: 7
Views: 281

Re: second wifi in zero w (sometimes)

I think this is the one: https://github.com/billz/raspap-webgui#simultaneous-ap-and-wifi-client First it didn't worked, it was a version updated for buster. I opened an issue and a few days later I re-installed and was able to create a station while access point was active, as described in linked do...
by blimpyway
Mon Aug 19, 2019 10:58 am
Forum: Networking and servers
Topic: second wifi in zero w (sometimes)
Replies: 7
Views: 281

Re: second wifi in zero w (sometimes)

You don't need a second wifi dongle, pi zero w can handle virtual wifi interfaces so it can be simultaneously both ap and station. I tested a package a while ago, which did just that with a web frontend so you don't need to recall arcane command line/config files. if you still need it I'll try to re...
by blimpyway
Mon Aug 19, 2019 10:34 am
Forum: Networking and servers
Topic: how do you switch wifi on a raspberry pi?
Replies: 7
Views: 448

Re: how do you switch wifi on a raspberry pi?

you have to be more specific on my pi there are 126 files which contain "wpa" in their names yet none of them is named just "wpa". It's more efficient if you bother to say e.g. wpa_supplicant.conf than everybody else trying to figure out or asking themselves what you actually wanted to say [email protected]...
by blimpyway
Mon Aug 19, 2019 10:13 am
Forum: Automation, sensing and robotics
Topic: Water sensor active high or low?
Replies: 1
Views: 198

Re: Water sensor active high or low?

you can try with the internal pullups and if they do not sense anything then it's time to make tests with a higher value (200k-1Mohm)potentiometer as external pullup. Or try smaller distance between sensor's probes. Wire sizes should not matter for motors. However they might induce parasite voltages...
by blimpyway
Mon Aug 19, 2019 9:44 am
Forum: Automation, sensing and robotics
Topic: Looking for help sensing striking of marching percussion instruments (drums)
Replies: 2
Views: 185

Re: Looking for help sensing striking of marching percussion instruments (drums)

Analog or digital? You need to record just the fact there was a strike or want to also know how strong it was? PS there are some sound sensor modules for Arduino, which: - can operate at 3.3v too - have both analog and digital output (adjustable with potentiometer) If you want analog values then an ...
by blimpyway
Mon Aug 19, 2019 9:39 am
Forum: Automation, sensing and robotics
Topic: Simple Variable Sharing Between Python Processes?
Replies: 4
Views: 167

Re: Simple Variable Sharing Between Python Processes?

You may consider a generic messaging queue (eg mosquitto) to communicate state changes across processes. Although is not by far as fast as shared memory, there are a few good reasons for this approach: - allows for modularity - have small processes each responsible with its own limited task - transp...
by blimpyway
Sun Aug 11, 2019 1:52 am
Forum: Other projects
Topic: How to create a "shift" button for other switches?
Replies: 10
Views: 449

Re: How to create a "shift" button for other switches?

Is there any reason the PC must receive keystrokes instead of say... network/serial/other type of communication? nvm here-s an instructable on how to emulate keyboard with a Pi Zero: https://randomnerdtutorials.com/raspberry-pi-zero-usb-keyboard-hid/ You will not use the modified usb keyboard+pcb, y...
by blimpyway
Sun Aug 11, 2019 1:38 am
Forum: Other projects
Topic: Creating an heart attack detector
Replies: 14
Views: 568

Re: Creating an heart attack detector

I wonder if there is possible to predict the heart attack a few seconds or maybe minutes in advance?
by blimpyway
Sun Aug 11, 2019 1:24 am
Forum: Other projects
Topic: Homemade airfryer
Replies: 9
Views: 440

Re: Controlling a premade appliance?

Yes you can but since you will likely have to deal with mains AC switching, you shouldn't.

And the obvious question is why? How would it improve the interface & taste the built-in buttons/dials/whatever the fryer already provides?
by blimpyway
Sun Aug 11, 2019 12:52 am
Forum: Automation, sensing and robotics
Topic: Multiple RFID Readers
Replies: 7
Views: 441

Re: Multiple RFID Readers

use: if line == b'\x02002FBE736C8E\r\n': without the extra "" -------------- Or even better just check the line contains your id: if "002FBE736C8E" in line.decode(): ------------------ The mode python uses bytes array and strings is a bit confusing. That's why you added an extra "" around a byte arr...
by blimpyway
Sun Aug 11, 2019 12:29 am
Forum: Networking and servers
Topic: Static IP if wifi not found.
Replies: 3
Views: 274

Re: Static IP if wifi not found.

Comitup worked on my pi zero w https://github.com/davesteele/comitup

There-s also a bootable sd image with it installed and enabled.
by blimpyway
Sun Aug 11, 2019 12:07 am
Forum: Python
Topic: Picamera with python
Replies: 3
Views: 145

Re: Picamera with python

In order to verify the camera is ok boot a raspbian card to see if raspicam/raspivid are working right. Otherwise you don't know whether your camera is junk or you did not configured it correctly on Mate. ------------------- Have you seen this article? https://larrylisky.com/2016/11/24/enabling-rasp...
by blimpyway
Fri Aug 02, 2019 7:59 pm
Forum: Automation, sensing and robotics
Topic: SLAM robot raspberry pi 4
Replies: 6
Views: 376

Re: SLAM robot raspberry pi 4

FPSychotic wrote:
Wed Jul 31, 2019 12:31 pm
And if limit the cpu power, it will cosume less than rpi in any circustance
That's a cool feature I didn't knew Pi4 is capable of. How do you limit its power so it consumes less than e.g. Pi A+ ?
by blimpyway
Fri Aug 02, 2019 7:34 pm
Forum: Automation, sensing and robotics
Topic: Agree? “IMU worthless for simple robots' x, y, heading?”
Replies: 9
Views: 356

Re: Agree? “IMU worthless for simple robots' x, y, heading?”

try to make a simple two wheel balancing bot (segway bot) without an imu. Balancing a reverse pendulum and providing heading and absolute World position are two very different problems. You might be right but the question on the title I answered to was different than the one you are thinking at, si...
by blimpyway
Wed Jul 31, 2019 9:00 pm
Forum: Other projects
Topic: Autonomous Boat
Replies: 15
Views: 930

Re: Autonomous Boat

But I would also think if simple GPS is that bad. Most lakes or rivers I know worth having fun with a robot boat are big enough to keep the boat off shore with a 5-10m position precision.
by blimpyway
Wed Jul 31, 2019 8:49 pm
Forum: Automation, sensing and robotics
Topic: Robot Shared Values / DB impact on RPi SD card
Replies: 2
Views: 113

Re: Robot Shared Values / DB impact on RPi SD card

If you write infrequently and have a "high/pro endurance" class SD card I would not worry much. You can also consider in memory databases https://en.wikipedia.org/wiki/List_of_in-memory_databases Or. if it suits you, a faster in memory key-value datastore like LMDB https://en.wikipedia.org/wiki/Ligh...
by blimpyway
Wed Jul 31, 2019 8:09 pm
Forum: Automation, sensing and robotics
Topic: Agree? “IMU worthless for simple robots' x, y, heading?”
Replies: 9
Views: 356

Re: Agree? “IMU worthless for simple robots”

try to make a simple two wheel balancing bot (segway bot) without an imu.
by blimpyway
Wed Jul 31, 2019 8:04 pm
Forum: Automation, sensing and robotics
Topic: Underwater ROV
Replies: 4
Views: 192

Re: Underwater ROV

relays turn motors on or off and that's it, with esc-s you have throttle control.

Is the rov tethered - how do you stream video?

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