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by omegaman477
Mon May 13, 2019 10:47 pm
Forum: Automation, sensing and robotics
Topic: Controlling IoT devices
Replies: 1
Views: 325

Re: Controlling IoT devices

The device you are looking at, if the Amazon link is correct is a ZigBee to RPI gateway/bridge. I assume it has its own I2C/SCA protocol to talk to the RPI, maybe even serial, its not clear from the add. I assume you will be using a number of off the shelf ZigBee Thermometers, and reading them over ...
by omegaman477
Mon May 13, 2019 10:40 pm
Forum: Automation, sensing and robotics
Topic: Soldering jumper wires to solenoid valve
Replies: 8
Views: 595

Re: Soldering jumper wires to solenoid valve

Put a decent electrolytic capacitor between the +12VDC power rail and ground, close to the FET (observe polarity) say 50VDC/1000uF. The solenoid will have a huge inrush current which could collapse the power rail enough to spike out the RPI. Testing with a globe is fine, but remember the solenoid is...
by omegaman477
Mon May 13, 2019 10:33 pm
Forum: Automation, sensing and robotics
Topic: Using PWM with Sabertooth motor controller
Replies: 8
Views: 500

Re: Using PWM with Sabertooth motor controller

Its really hard to debug software PWM's without being able to inspect the output waveform with an Oscilloscope. Reading up on the Sabertooth 25x2, it can be driven several ways. Its not clear from your post what mode are you using. Are you using the PWM to generate an analogue signal, and the Sabert...
by omegaman477
Mon May 13, 2019 5:46 pm
Forum: Automation, sensing and robotics
Topic: Monitoring machine status
Replies: 2
Views: 303

Re: Monitoring machine status

Hello guys. Firstly I would like to be known that I am complete beginner in Raspberry Pi. So what I would like to do is monitor my cnc machines status. Every machine has a light tower. Green for machine has finished the process, blinking yellow for machine is working and red for machine has stopped...
by omegaman477
Mon May 13, 2019 5:43 pm
Forum: Automation, sensing and robotics
Topic: My temp sensor ds18b20 doesn't seems accurate
Replies: 14
Views: 992

Re: My temp sensor ds18b20 doesn't seems accurate

Any good ways to verify the real temp with quite good accuracy? I mean, besides a $50000 unit lol Boiling water and ice in distilled water, compensate for your altitude, there are online calculators. But I would bet your only reading the top 9 bits and calculating against that, rather than the full...
by omegaman477
Thu May 09, 2019 10:37 pm
Forum: Automation, sensing and robotics
Topic: Controlling the generated force of a voice coil actuator
Replies: 2
Views: 246

Re: Controlling the generated force of a voice coil actuator

Hey guys! I am currently working on a project containing Hall-Sensors (measurment of magnetic fields) and voice coil actuators (high frequency linear motors, which have a force proportional to current output). I don't know how to describe my knowlege better than "non-existent": My task is to measur...
by omegaman477
Thu May 02, 2019 11:33 am
Forum: Automation, sensing and robotics
Topic: Sensors and switches
Replies: 1
Views: 266

Re: Sensors and switches

So, I need to connect my Pi to: * A sensor that "knows" it's been touched by water (to see if I need to add more) * An on/off switch to turn off a pump on or off (to take water out) * An inline on/off switch, which will allow water to come in (to fill it up) * A device able to drop 10 drops of PH a...
by omegaman477
Thu May 02, 2019 11:17 am
Forum: Automation, sensing and robotics
Topic: Pressure logging project
Replies: 6
Views: 481

Re: Pressure logging project

I am fairly new to Pi usage and want to do a Pressure logging project to sense and record pressures over time from a set of Pressure Transducers (0-3000PSI). The logger will need 2 sensors to be recording pressures from seperate banks either by same Pi or one for each side. Whichever way works best...
by omegaman477
Thu May 02, 2019 10:58 am
Forum: Automation, sensing and robotics
Topic: Sensing an object on a plastic surface
Replies: 3
Views: 336

Re: Sensing an object on a plastic surface

I am a beginner, this is my first post, sorry if it doesn't belong here (please advise where to go for more help). Here is the video of the thing I am interested to build: https://www.youtube.com/watch?time_continue=2&v=8TcIxX_JkfU I've also attached the screenshot from the video: Screen Shot 2019-...
by omegaman477
Fri Apr 26, 2019 2:07 am
Forum: Automation, sensing and robotics
Topic: Outdoor Pond Water Level Control / Valve
Replies: 9
Views: 782

Re: Outdoor Pond Water Level Control / Valve

But the super simple approach is two float switches. Cheap, rugged and reliable. Most float switches are based on mercury contact switches, and sometimes magnet and reed. Mercury tilt switches are accurate (reproducible) to the mm. Magnet /Reed switches tend to gain hysteresis as they age. As to th...
by omegaman477
Thu Apr 25, 2019 1:29 pm
Forum: Automation, sensing and robotics
Topic: send a keystroke received from a raspbian "contemporarily" to another
Replies: 2
Views: 248

Re: send a keystroke received from a raspbian "contemporarily" to another

Hi, I need that 2 raspbian will receive the same keystroke received from one of them (just CROSS TO LEFT and CROSS TO RIGHT, nothign else) simultaneously. Is that possible? how? "Contemporarily" what a great word, which it is not. Its better to use simpler English, than make stuff up. We need more ...
by omegaman477
Thu Apr 25, 2019 1:20 pm
Forum: Automation, sensing and robotics
Topic: Outdoor Pond Water Level Control / Valve
Replies: 9
Views: 782

Re: Outdoor Pond Water Level Control / Valve

Hi guys - I'm trying to find a solution, that hopefully might already be available to solve this problem. I have 2 waterfall / ponds (they're pretty elaborate), that use commercial grade pumps to flow the water (10,000 gallons per hour). One is in the front, and one is in the back. Unfortunately, o...
by omegaman477
Thu Apr 25, 2019 1:07 pm
Forum: Automation, sensing and robotics
Topic: License plate recognition?
Replies: 4
Views: 427

Re: License plate recognition?

Hello, I want to make my gate to be opened by car's license plate. Is it possible with Pi Zero? And what camera should I use? Just a tip. Most commercial and law enforcement Number Plate Readers work in the IR spectrum. Allows them to disregard plastic covers, reflective (visible) paint, etc. Inter...
by omegaman477
Thu Apr 25, 2019 1:00 pm
Forum: Automation, sensing and robotics
Topic: USB GPS Speed
Replies: 2
Views: 206

Re: USB GPS Speed

Most, if not all NMEA devices default to 9600, 8 bit, NP. All NMEA messages (with the exception of images, radar blobs etc) are strictly ASCII, and in most cases human readable messages. However, all the above is assuming that the device is actually NMEA compliant. A lot of copy/generic/cheapo devic...
by omegaman477
Thu Apr 25, 2019 12:40 pm
Forum: Automation, sensing and robotics
Topic: PLC and Raspberry PI 3 B
Replies: 8
Views: 1109

Re: PLC and Raspberry PI 3 B

Note, while a pi will pass CE/FCC, it will usually fail industry specific ISO requirements. A very general and broad statement, and IMHO inaccurate. I invite you to specify an ISO Standard that a RPi would fail to meet, but a PLC would. In all systems design, especially Reliable Control or Industri...
by omegaman477
Thu Apr 25, 2019 12:22 pm
Forum: Automation, sensing and robotics
Topic: PLC and Raspberry PI 3 B
Replies: 8
Views: 1109

Re: PLC and Raspberry PI 3 B

There are a number of good open source SCADA HMI projects for Linux, most would be portable to an RPI. Linux (BSD aka Raspbian) are perfectly suited to industrial HMI applications, with the proper software. I do not agree with the statement that you must use the PLC providers expensive, feature less...
by omegaman477
Thu Apr 25, 2019 11:56 am
Forum: Automation, sensing and robotics
Topic: Hydroponics web interface
Replies: 10
Views: 1117

Re: Hydroponics web interface

Working on a similar project except for a high rise apartment and solar powered. There are several Irrigation projects for Linux and RPI, notably OpenSprinkler Pi (OSPi) — https://rayshobby.net/wordpress/ospi/ They look very fancy, but there is some work to port the code to other (your DIY) hardware...
by omegaman477
Thu Apr 25, 2019 11:44 am
Forum: Automation, sensing and robotics
Topic: Is the Raspberry Pi suitable for this project? (Solar Tracking a PTC)
Replies: 5
Views: 518

Re: Is the Raspberry Pi suitable for this project? (Solar Tracking a PTC)

Although a Pi is somewhat overkill, having the underlying Linux O/S provides so many advantages (remote access, remote code maintenance, logging, watch dog applications,) If this is a remote application, or highly experimental, consider an RPI. Otherwise Arduino's will easily manage the task, and ge...
by omegaman477
Wed Apr 17, 2019 12:25 pm
Forum: Automation, sensing and robotics
Topic: engine fuel vacuum gauge
Replies: 1
Views: 258

Re: engine fuel vacuum gauge

Hi All, I want to fit a vacuum pressure gauge to the fuel filter of a large marine diesel and monitor it via my rPi. The purpose being to monitor the vacuum required to draw fuel from the tank and thru the filter. A high reading (very low pressure) will indicate blocked filter or fuel pickup (a rec...
by omegaman477
Wed Apr 17, 2019 12:17 pm
Forum: Automation, sensing and robotics
Topic: Can a power line provide Raspberry Pi and a lamp with power?
Replies: 16
Views: 1056

Re: Can a power line provide Raspberry Pi and a lamp with power?

I want to control a lamp with Raspberry Pi and a relay. However, I want a single power line to provide power for Raspberry Pi and the lamp. How can I do that? In other words, I want to construct a WiFi lamp with Raspberry Pi, a relay, and a lamp. If this is a table lamp and you have access to both ...
by omegaman477
Fri Apr 12, 2019 10:57 am
Forum: Automation, sensing and robotics
Topic: Test bench with Raspberry Pi
Replies: 1
Views: 271

Re: Test bench with Raspberry Pi

Hello guys, I want to make a test bench setup of Light control, button presser, flash detect and electromagnet control with raspberry Pi. Any help would be appreciated Light control - LEDs bright enough to simulate ambient light/ charge device. Use PWM to control brightness. Button Presser - Physic...
by omegaman477
Fri Apr 12, 2019 10:51 am
Forum: Automation, sensing and robotics
Topic: Smart Door Lock, making a Pi act as a smart device?
Replies: 1
Views: 253

Re: Smart Door Lock, making a Pi act as a smart device?

I have done something similar. Google and most Home Auto systems will integrate OOB with IFTTT, and there are libraries and SDK's for Raspbian to IFTTT, plus the IFTTT Webhooks service. Thats the path I would follow, as its the most 'open', secure and applicable to most HA controllers. https://suppo...
by omegaman477
Fri Apr 12, 2019 10:40 am
Forum: Automation, sensing and robotics
Topic: Looking for my first project please help
Replies: 1
Views: 161

Re: Looking for my first project please help

Hey guys I‘m new here and have a new raspberry pi. I would like to test it and I have a sound sensor and a speaker. Is there a demo project which I can use to build up something with sound sensor raspberry and speaker??? I‘m not a programmer but good in Linux. Would be cool if you have something fo...
by omegaman477
Fri Apr 12, 2019 10:12 am
Forum: Automation, sensing and robotics
Topic: DS18B20 network issues after 2 months stable
Replies: 5
Views: 428

Re: DS18B20 network issues after 2 months stable

Avoid loops in I2C networks at all costs, star topology is best.

A large ring as you describe could introduce all sorts of electrical noise.
by omegaman477
Fri Apr 12, 2019 10:09 am
Forum: Automation, sensing and robotics
Topic: CT Sensor not working on home AC Feed
Replies: 5
Views: 369

Re: CT Sensor not working on home AC Feed

Hi all, I've been working on getting a CT sensor to work for a couple of weeks now. I've been doing my testing with a standard 13A kettle lead and have separated the live, neutral and earth - putting the clamp around the live wire. This has worked fine and I've got some accurate, calibrated reading...

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