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by omegaman477
Tue Jul 23, 2019 3:40 am
Forum: Automation, sensing and robotics
Topic: Hardware required for making an autonomous airplane which is optionally controllable via transmitter.
Replies: 3
Views: 269

Re: Hardware required for making an autonomous airplane which is optionally controllable via transmitter.

To your RC control question. The catch here is if the servos are directly connected to the Pi, and the Pi takes in the RC commands, all is good until the Pi crashes. Then you have a dead stick. To be failsafe, you would need to allow the servos to be controlled by both the Pi and the RC receiver, wi...
by omegaman477
Fri Jul 19, 2019 8:37 am
Forum: Automation, sensing and robotics
Topic: Electronic chess board and identifying specific pieces
Replies: 8
Views: 539

Re: Electronic chess board and identifying specific pieces

I have seen two version of this; The first version had a 3.5mm TRS plug extending from the base of each piece which plugged into a corresponding socket on each square. Each piece had two different resistors inside, and the CPU scanned these resistor values (as part of a simple voltage divider), dete...
by omegaman477
Fri Jul 19, 2019 8:27 am
Forum: Automation, sensing and robotics
Topic: Project Idea getting feedback before I begin
Replies: 9
Views: 460

Re: Project Idea getting feedback before I begin

I would start by thinking about machine vision. Have the Pi Camera look at the indicator board, and look for the lights coming on. The various machine vision libraries for the Pi have support for this sort of basic detection. Failing that it would mean attaching a small photodiode to each call light...
by omegaman477
Fri Jul 12, 2019 12:28 pm
Forum: Other projects
Topic: Project - Nuclear power plant control room simulator
Replies: 3
Views: 419

Re: Project - Nuclear power plant control room simulator

Very cool idea. So your going to want to interface lots and lots of switches and LEDs, cheaply. I2C is your answer. There are countless cheap chinese 8,16,32 Digital I/O modules for I2c on Alliexpress/Banggood. Most will drive the LED's directly, and a bit of software will debounce your switches. Th...
by omegaman477
Fri Jul 12, 2019 12:15 pm
Forum: Other projects
Topic: Raspberry PIpe Organ
Replies: 11
Views: 1333

Re: Raspberry PIpe Organ

My only advice is to base your design on a MIDI interface between the console controller and the loft controller (and maybe a controller in the air pump/bellow room). There are countless MIDI over fibre/cat5 extenders, splitters etc. You may need multiple loft controllers for ease of design or perfo...
by omegaman477
Fri Jul 12, 2019 11:57 am
Forum: Automation, sensing and robotics
Topic: Thermocouple vs Temperature Sensors
Replies: 4
Views: 344

Re: Thermocouple vs Temperature Sensors

Hi, just a general question: I want to detect values from a generator. What's the difference between using thermocouple or temperature sensors? When you say temperature sensor, I assume you mean a digital style DS18B20 style chip sensor, but here is the run down. When I speak of Thermocouples, the ...
by omegaman477
Wed Jul 03, 2019 2:15 pm
Forum: Automation, sensing and robotics
Topic: DS18B20: Influence of supply voltage on temperature
Replies: 21
Views: 1722

Re: DS18B20: Influence of supply voltage on temperature

All temperature sensing projects, I MEAN ALL, should be calibrated against a reliable standard or reference. Direct read digital sensors have lead the world into a false sense of accuracy. An DS18xxx sensor can be up to +/- 2ºC incorrect on OFFSET. Regardless of what the sensor tells you, calibrate ...
by omegaman477
Wed Jul 03, 2019 2:08 pm
Forum: Automation, sensing and robotics
Topic: Complete beginner, Rubik's Cube robot Project
Replies: 1
Views: 182

Re: Complete beginner, Rubik's Cube robot Project

Your plan is valid and a good start. One tip, Do your research, Do your research, Do your research, Do your research, as there are many articles on this subject. Be sure to understand the rules if you want to compete, that is some time is allowed for scanning the cube before you start to solve it. T...
by omegaman477
Sat Jun 15, 2019 3:30 pm
Forum: Other projects
Topic: PPG waveform acquistion using Photodiodes - Is it possible with Raspberry Pi?
Replies: 1
Views: 234

Re: PPG waveform acquistion using Photodiodes - Is it possible with Raspberry Pi?

Hey there, I've been trying to make a multi-parameter biomedical system that displays various parameters like SpO2 percentage, Heart rate variability, etc., for which I want to use a red led and a photodiode in order to receive the reflected light from the skin. I would like to know whether this pr...
by omegaman477
Sat Jun 15, 2019 3:24 pm
Forum: Automation, sensing and robotics
Topic: valve to control air flow?
Replies: 6
Views: 405

Re: valve to control air flow?

hi and thank you ;) ok so bit more details about what I'm looking for. I do have an Air compressor with 130litres/min and not so high pressure, this compressor provides air around my outdoor lake. That compressor is connected to two branches, one for one side, second for second side, connected by T...
by omegaman477
Fri Jun 14, 2019 2:32 pm
Forum: Automation, sensing and robotics
Topic: Self-managing race car air suspension
Replies: 7
Views: 682

Re: Self-managing race car air suspension

If you try it in a race, perhaps figure out a way to keep the thing cool and pot the crap out of everything! While potting is a sound method to protect against mechanical shock, moisture and dust. It does not help heat dissipation, in some cases it will work in reverse and make the problem worse. S...
by omegaman477
Fri Jun 14, 2019 2:25 pm
Forum: Automation, sensing and robotics
Topic: Connecting a commercial accelerometer to RaspPi
Replies: 3
Views: 588

Re: Connecting a commercial accelerometer to RaspPi

These type of Laboratory Accelerometers are usually either voice coil or piezo in construction. Both outputting low ANALOGUE DC signals, typically around 1vdc/g. THey send a raw signal, allowing your instrumentation to see peaks curves and spikes. Unlike the chip style accelerometers (usually a Hall...
by omegaman477
Fri Jun 14, 2019 2:09 pm
Forum: Automation, sensing and robotics
Topic: How to maximize Robot Play Time - NiMH Batteries?
Replies: 6
Views: 478

Re: How to maximize Robot Play Time - NiMH Batteries?

BAck to basics. There are only four possible problems here; 1. The charger is not doing its job 2. The battery pack is faulty and not holding a charge 3. The robot is using more power than expected 4. The Juice data is bullshit. I suspect you either have a dodgy charge situation, or a bad cell in th...
by omegaman477
Fri Jun 14, 2019 2:03 pm
Forum: Automation, sensing and robotics
Topic: multiple DS18B20 no longer showing up
Replies: 4
Views: 535

Re: multiple DS18B20 no longer showing up

So your changes broke the circuit. Go back to your last working design Then add the changes one by one. One sensor at a time Guaranteed its a bad connection/crossed wires RJ11 crimp connectors are renowned for trouble. Check all your cables and crimps first. Do not loose sight of the forest for the ...
by omegaman477
Fri Jun 14, 2019 1:56 pm
Forum: Automation, sensing and robotics
Topic: Let's give voice to my robot... Speaker problem
Replies: 11
Views: 942

Re: Let's give voice to my robot... Speaker problem

You dont need a hat for basic sound. So most RPI boards have an Analogue Audio Out via a 3.5mm TRS audio jack, like a PC or Smartphone. Audio needs to be enabled in both firmware and software first, see https://www.raspberrypi.org/documentation/configuration/audio-config.md The Audio out is Line lev...
by omegaman477
Sat Jun 08, 2019 5:22 pm
Forum: Other projects
Topic: Ideas for a Homemade Ware-House System
Replies: 3
Views: 341

Re: Ideas for a Homemade Ware-House System

Hi, i´m very interrested in many thing, not just the RPI only. But i have a real Problem: Many things i own i can´t find because they are somewhere in my Cellar in one of the uncount Boxes. So i have the Idea about a Ware House System like Amazon it use! I´d like to have a Database, where i can des...
by omegaman477
Sat Jun 08, 2019 5:17 pm
Forum: Other projects
Topic: How to internal website send command to terminal raspbian
Replies: 5
Views: 406

Re: How to internal website send command to terminal raspbian

In Python, there are many ways to execute external programs. The easiest one is to import the os package. It provides the popen(), system(), startfile() methods.

But it is dependant on your local O/S.

os.popen() should solve your needs.
by omegaman477
Sat Jun 08, 2019 5:13 pm
Forum: Other projects
Topic: Rpi 4g phone call?
Replies: 4
Views: 562

Re: Rpi 4g phone call?

You do not gain anything from using 4G for voice or SMS - 2G is overkill :lol: PiTalk is a 3G phone http://pitalk.co.uk that you can add your own programs into and the data rate is faster than some ADSL links in the local area :cry: Thats a generalisation. 2G in a lot of countries has been decommis...
by omegaman477
Sat Jun 08, 2019 10:53 am
Forum: Automation, sensing and robotics
Topic: Self-managing race car air suspension
Replies: 7
Views: 682

Re: Self-managing race car air suspension

I want to try and build an "affordable" system that can actively monitor and adjust air pressure in each of the 4 air-shocks using height as the reference measurement. The plan is to use these shocks https://www.airliftperformance.com/product/82607/ and this encoder https://www.adafruit.com/product...
by omegaman477
Sat Jun 08, 2019 10:39 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi distance measuring
Replies: 4
Views: 547

Re: Raspberry Pi distance measuring

Trying to keep things simple, If the drive train to the push rod is solid and will not slip, I would use a rotary encoder on the stepper motor shaft, or even simpler a closed loop, servo style stepper motor, when you can be sure that no steps are missed. There are many options here available, all fu...
by omegaman477
Sat Jun 08, 2019 10:23 am
Forum: Automation, sensing and robotics
Topic: Turn on/off lights from button/sensor
Replies: 2
Views: 217

Re: Turn on/off lights from button/sensor

I would be looking to use standard Home Automation (HA) light/power/sensor devices around you shop, Phillips Hue, Zigbee, Zwave, iHome, Netamo) They are cheap, easy to install etc. What they all lack is complex condition/decision programming. There are a couple of HA suites for the RPI (see google),...
by omegaman477
Sun Jun 02, 2019 5:18 am
Forum: Other projects
Topic: Running A Metrics Display Board
Replies: 1
Views: 359

Re: Running A Metrics Display Board

So as you rightly said, getting access to the SAP data is your biggest challenge. If the data you need is in SAP BW, and they have a API enabled for that cube, your good. This is a basic restful API over HTTP. Easy to do on a RPI and with Python. If the data is not in a BW cube, then it gets harder....
by omegaman477
Sun Jun 02, 2019 5:00 am
Forum: Automation, sensing and robotics
Topic: What sensor for controlling home temperature?
Replies: 4
Views: 373

Re: What sensor for controlling home temperature?

sharperalison6 wrote:
Fri May 31, 2019 12:06 pm
Hi,

i was interested by using my raspberry pi to control my home temperature, could you please gimme further informations about which sensor should i use ?
Wired or Wireless?
by omegaman477
Sat Jun 01, 2019 11:45 pm
Forum: Automation, sensing and robotics
Topic: DS18B20 resolution
Replies: 15
Views: 1112

Re: DS18B20 resolution

0.25ºC resolution suggests you are not reading the full 12 bits.
by omegaman477
Sat Jun 01, 2019 11:42 pm
Forum: Automation, sensing and robotics
Topic: Self-managing race car air suspension
Replies: 7
Views: 682

Re: Self-managing race car air suspension

This is the sort of pressure transducer I would use: https://au.element14.com/honeywell/px3an2bs250paaax/pressure-transducer-250psi-1-8/dp/2532230?st=pressure%20transducer It produces a 0-5VDC voltage proportional to the pressure sensed. You would then need to pass that signal through a AD convertor...

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