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by omegaman477
Thu Oct 26, 2017 12:06 pm
Forum: Beginners
Topic: Driving a stepper motor
Replies: 1
Views: 451

Re: Driving a stepper motor

If software is your thing and hardware is not then get an all in one Stepper Motor Hat... like https://www.adafruit.com/product/2348

I am pretty sure this could be connected to a Zero, but not a straight plugin.
by omegaman477
Thu Oct 26, 2017 12:02 pm
Forum: Beginners
Topic: Setting up a FTP File Server
Replies: 2
Views: 2342

Re: Setting up a FTP File Server

Hey there, i'm kinda new to the RPI and the whole environment such as the os (raspbian). What i'm trying to achieve is setting up a FTP File Server, which can be accessed by anybody via browser. I do have a dynamic DNS which points towards my pi and i'm using RSA authentication to access the machin...
by omegaman477
Thu Oct 26, 2017 11:56 am
Forum: Beginners
Topic: raspberry pi 3 outdoor
Replies: 10
Views: 2677

Re: raspberry pi 3 outdoor

well, cost currently isn't an issue for me a 500$ total cost for the gateway is fine if i must the power consumption on the other hand is important I have checked the IP67 cases, i think they solve the humidity and dust issue but not the temperature I do a lot of remote install work with RPI outdoo...
by omegaman477
Thu Oct 26, 2017 11:41 am
Forum: Beginners
Topic: Controlling Solenoid Valve
Replies: 7
Views: 2236

Re: Controlling Solenoid Valve

Some thoughts. On/Off modulating tends to not work that well when you have a very fast rise time, that is the mixed water will rise in temp quickly when the cold is turned off. They are better for systems when you have some thermal mass, ie a radiator or bath full of water. If the water is coming ou...
by omegaman477
Thu Oct 26, 2017 11:32 am
Forum: Beginners
Topic: Need help to create a shutdown button with a usb button.
Replies: 2
Views: 643

Re: Need help to create a shutdown button with a usb button.

Did some research. Your USB board works with Retro-Pie, the retro gaming emulator for PI's. It allows mapping of any of your inputs to a specific keyboard sequence. Your script would just have to open the console keyboard, or another, as input, and you look for the correct key sequence. Obviously Re...
by omegaman477
Thu Oct 26, 2017 11:22 am
Forum: Beginners
Topic: Need help to create a shutdown button with a usb button.
Replies: 2
Views: 643

Re: Need help to create a shutdown button with a usb button.

Yes you idea will work. You need to research how the USB presents the IO pins, do you connect the USB as a TTY and read in a byte, or otherwise.. there should be examples from the USB supplier. Then you code needs to poll the USB device (methods will vary depending on above) and when it sees a butto...
by omegaman477
Thu Oct 26, 2017 11:12 am
Forum: Beginners
Topic: Control circulation pumps, how should I approach this?
Replies: 5
Views: 954

Re: Control circulation pumps, how should I approach this?

Its best to control DC motors with Pulse Width Modulation as opposed to stratigh voltage or current limiting. This ensures better low speed torque, which is what you need with a pump. So you can get nice slow even startup speeds. This hat from Adafruit is exactly what you need. https://www.adafruit....
by omegaman477
Thu Oct 26, 2017 11:01 am
Forum: Beginners
Topic: ssh: connect to host raspberrypi.local port 22: Connection refused
Replies: 2
Views: 2961

Re: ssh: connect to host raspberrypi.local port 22: Connection refused

Knowing what O/S your using would help, however. Are you getting the connection refused, before or after a username or password prompt? If its before, its basic network access/security. Check the SSHD logs in /var/log/..... (actual file depends on your O/S) SSHD always records why a connection was r...
by omegaman477
Thu Oct 26, 2017 10:43 am
Forum: Automation, sensing and robotics
Topic: Which shock sensor works with with pi3?
Replies: 5
Views: 1764

Re: Which shock sensor works with with pi3?

The RPI SenseHat has onboard accelerometers, brilliant and easy to use.
by omegaman477
Thu Oct 26, 2017 10:37 am
Forum: Automation, sensing and robotics
Topic: Temperature Sensor for -80 Celsius?
Replies: 4
Views: 1060

Re: Temperature Sensor for -80 Celsius?

I've used the DS18B20 sensor before, but read that the coldest it could handle was 55 celsius. Does anyone know of a different sensor, compatible with Raspberry Pi, which could handle -80 celsius. Planning to install to a freezer which needs to stays at that temperature. Thanks craig As the team ha...
by omegaman477
Thu Oct 26, 2017 10:16 am
Forum: Windows 10 for IoT
Topic: Sensor recommendations for raspberry Pi 2 with Windows iot
Replies: 3
Views: 1608

Re: Sensor recommendations for raspberry Pi 2 with Windows iot

So detecting a flame is done usually three ways either 1) by an ionisation detector, burning gas is conductive, so an ionisation detector has a wire in th eflame path and they detect a current flow, many cheap detectors on the market that provide relay outputs. 2) thermal, as whats used in most gas ...
by omegaman477
Thu Oct 26, 2017 10:07 am
Forum: Troubleshooting
Topic: PXE boot not working
Replies: 3
Views: 1824

Re: PXE boot not working

Hi everyone, I have a Raspeberry Pi 3 fully functional, I have already installed two systems on it with success. Now I'm trying to use PXE with it. I've followed the tutorial [1], but the client part is not working. I have checked the OTP value and its OK, but without the MicroSD card, the Raspberr...
by omegaman477
Tue Feb 28, 2017 3:03 pm
Forum: Windows 10 for IoT
Topic: Sensor recommendations for raspberry Pi 2 with Windows iot
Replies: 3
Views: 1608

Re: Sensor recommendations for raspberry Pi 2 with Windows i

By fire, I assume you mean uncontrolled bad fire, not a burner. There are plenty of commercial fire sensors around, sold as add ons to alarms systems. They are usually heat sensing, smoke detection will give you early warning. Again plenty of NFC and RFID readers around, most are USB, some are TTL s...
by omegaman477
Tue Feb 28, 2017 2:56 pm
Forum: Other projects
Topic: RPI cooling while sealed in a plastic case...
Replies: 11
Views: 6514

Re: RPI cooling while sealed in a plastic case...

Interestingly enough the new GreenIQ smart irrigation controller, which is in a swanky plastic case is built on a RPI. Ihave mine in the Aussie summer sun (over 80C on case external) with no issues. But I have a sun shade for it.
by omegaman477
Tue Feb 28, 2017 2:51 pm
Forum: Other projects
Topic: RPI cooling while sealed in a plastic case...
Replies: 11
Views: 6514

Re: RPI cooling while sealed in a plastic case...

I do a lot of harsh environment work, and over heating is always an issue. Ideas.. 1. Potting the RPI in a heat conductive silicone is often very effective, use a solid aluminium case with external fins as the pot. But this is a one way trip. Some silicones a pickable. 2. Use an oversized aluminium ...
by omegaman477
Tue Feb 28, 2017 2:37 pm
Forum: Automation, sensing and robotics
Topic: weird problem: PIR sensor positive on wifi activity
Replies: 19
Views: 6833

Re: weird problem: PIR sensor positive on wifi activity

Most likely the PIR is tripping due to RF interference. A common problem with the cheap ones. Decouple its PSU.
by omegaman477
Tue Feb 28, 2017 2:35 pm
Forum: Automation, sensing and robotics
Topic: Sensing humidity in a high temperature environment
Replies: 3
Views: 950

Re: Sensing humidity in a high temperature environment

So, basic physics.. Over 100C, at sea level, there is no humidity per se. Water has boiled off and exists as high temp steam. Due to the temperature, the air simplistically, can not carry the water vapour. Water behaves as a gas over 100C In industry, where they must sense water content (ie large fu...
by omegaman477
Tue Feb 28, 2017 2:23 pm
Forum: Automation, sensing and robotics
Topic: What hardware for home automation?
Replies: 8
Views: 2134

Re: What hardware for home automation?

My 20 cents worth. Use the generic alarm PIR's as suggested. They will need 12 DC to run and provide a NC relay contract on trip. Opto Isolators are great and essential if the wire runs from the sensors to the RPI are long. Keep it short and you should be OK. PIR's are famous for false triggering, e...
by omegaman477
Tue Feb 28, 2017 2:11 pm
Forum: Automation, sensing and robotics
Topic: Beer Brewing Automation
Replies: 3
Views: 1582

Re: Beer Brewing Automation

Flame Detection... Most smaller automatic burners (ie hotwater service, stove top etc) all use ionisation detectors. A flame is conductive, and you will see the small wire in the flames path (not the ignitor). They are cheap, reliable and easily installed. UV Optical sensors tend to be used on much ...
by omegaman477
Tue Feb 28, 2017 1:45 pm
Forum: Automation, sensing and robotics
Topic: Easy project
Replies: 9
Views: 1844

Re: Easy project

I have used 1 wire temp sensors for industrial and immersion applications for years. Mostly I pot the sensor in a length of rigid tubing (glass, polycarb, copper, S/S) in all cases the tube has one end properly sealed, a good blob of heat shrink compound on the sensor before you shove it into the tu...
by omegaman477
Tue Feb 28, 2017 1:37 pm
Forum: Beginners
Topic: How to access root directory of linux on SD card
Replies: 3
Views: 5980

Re: How to access root directory of linux on SD card

What operating system do you want to use?

Once installed, most O/S can be configured to be headless. Or do you want to install headless? (harder)
by omegaman477
Tue Feb 28, 2017 1:35 pm
Forum: Beginners
Topic: Emitting Ultrasonic Sounds At Different Frequencies
Replies: 8
Views: 2106

Re: Emitting Ultrasonic Sounds At Different Frequencies

As you have surmised you will need a piezo 'speaker' to get to 60Khz. Small piezo transducers have shocking distortion, and are best suited to square/triangular waveforms. Sinewaves they dont do well. Exception to this is high end HiFi piezo tweeters, which render well, and most deliver well above t...
by omegaman477
Tue Feb 28, 2017 1:27 pm
Forum: Beginners
Topic: Connect to MySQL on Laptop using Raspberry pi
Replies: 2
Views: 733

Re: Connect to MySQL on Laptop using Raspberry pi

By default MySQL users are created so that they can only login from localhost. I suspect that is your issue.

Either specify a hostname for the user account, or use the % wildcard for any host.

[url]See: https://dev.mysql.com/doc/refman/5.7/en ... users.html[/url]

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