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by ElEscalador
Thu Sep 12, 2019 12:01 am
Forum: Beginners
Topic: Relay - can it be used in reverse (signal microcontroller) ?
Replies: 14
Views: 539

Re: Relay - can it be used in reverse (signal microcontroller) ?

You could certainly use a relay with a 100vac coil like this one https://amzn.to/2NVr0RV Unless you're in Britain, or Europe, or other places with 230V AC Very true - my bad. I can't help it - as an American, I was raised that we're center of the universe. Also our new thing is to refuse to correct...
by ElEscalador
Wed Sep 11, 2019 12:25 pm
Forum: Beginners
Topic: Relay - can it be used in reverse (signal microcontroller) ?
Replies: 14
Views: 539

Re: Relay - can it be used in reverse (signal microcontroller) ?

You could certainly use a relay with a 100vac coil like this one https://amzn.to/2NVr0RV and monitor the contacts as you would any switch - I do it all the time for different reasons but I also worth with and control voltages up to 480 3 phase for a living. I think the above is is on the right track...
by ElEscalador
Tue Aug 27, 2019 9:38 pm
Forum: Automation, sensing and robotics
Topic: Motor Sensing Circuit help
Replies: 5
Views: 229

Re: Motor Sensing Circuit help

If it's simple on/off, you can bias a transistor with it. I wish I could easily post a sketch. There are different types of transistors...I'll talk about an NPN - which I always thought of as "supplies a negative" when biased with a positive. Basically the input from your sensor would go to the "bas...
by ElEscalador
Sat Aug 17, 2019 12:09 pm
Forum: Beginners
Topic: IR laser and reciever
Replies: 3
Views: 615

Re: IR laser and reciever

Not sure why you'd want specifically a laser, but I would try modulating the laser output on and of with the output from the serial pin (TXing a unique identifier and whatever other information). The receiver is just an IR phototransistor as an interface to the RX pin. If the tanks send at the same ...
by ElEscalador
Thu Aug 15, 2019 11:54 am
Forum: General discussion
Topic: Using Pi for driving 100 or more electromagnets
Replies: 4
Views: 289

Re: Using Pi for driving 100 or more electromagnets

PWM is trivial on the pi (try pigpio)but there aren't 100 pins so unless some of them are going to be operated in parallel no - you cannot control 100+ without external hardware. What are you driving the magnets with? Certainly you are aware that you need some driving hardware because the PI pins ca...
by ElEscalador
Fri Jul 26, 2019 11:54 am
Forum: Automation, sensing and robotics
Topic: SLAM robot raspberry pi 4
Replies: 6
Views: 589

Re: SLAM robot raspberry pi 4

Neato XV11 robot vacuum lidar is dirt cheap on ebay these days. Other than that...wheel encoders. They'll work on any pi. I'm not really sure what the pi4 would do for you over a pi3B (not even the 3B+) besides suck down your battery and give you headache getting all the software working that isn't ...
by ElEscalador
Sun Jul 21, 2019 3:48 pm
Forum: Beginners
Topic: Using a desktop PC for Pi development
Replies: 8
Views: 540

Re: Using a desktop PC for Pi development

Realvnc. Preinstalled at least on the last couple versions. You can leave your pi at home and program/control your robot or whatever from the space station or anywhere else with internet.
by ElEscalador
Fri Jul 05, 2019 1:56 pm
Forum: General discussion
Topic: Does the pi throttle for temperature regardless of OS?
Replies: 5
Views: 380

Re: Does the pi throttle for temperature regardless of OS?

Thanks. This made the most sense to me, but I have learned through years of troubleshooting devices that I had better not rely on anything being built or programmed in the manner that seems to make the most sense,
by ElEscalador
Thu Jul 04, 2019 9:18 pm
Forum: General discussion
Topic: Does the pi throttle for temperature regardless of OS?
Replies: 5
Views: 380

Does the pi throttle for temperature regardless of OS?

I just realized I have no idea if temp monitoring and throttling happens somewhere in firmware or if it's handled by Raspbian. Does it still throttle if running something else like lubuntu?
by ElEscalador
Wed Jul 03, 2019 2:48 pm
Forum: General discussion
Topic: Pi 5 needs only one upgrade, please
Replies: 1
Views: 226

Pi 5 needs only one upgrade, please

Fan pins. All these extras on the 3b+ and now the 4 and all I really wanted was an extra pair of pins (5v/gnd) to plug a doggone fan into without losing the ability to plug a standard 40 pin cable into my GPIO header.
[/rant]
by ElEscalador
Mon Jul 01, 2019 1:52 pm
Forum: Other projects
Topic: non programmer needs to build an all inclusive pool controller
Replies: 15
Views: 870

Re: non programmer needs to build an all inclusive pool controller

Start with identifying what parts you need to control. I'm going to guess...pump..maybe heater? No idea what else. Those would most commonly be turned on and off, rather than needing varying signals to control. This would most commonly be done with relays. So you need to learn how to control a relay...
by ElEscalador
Thu May 23, 2019 12:02 pm
Forum: Beginners
Topic: wifi remote access to usb Camera within c++ application
Replies: 1
Views: 78

Re: wifi remote access to usb Camera within c++ application

What does the program need to be able to do with the images? I know there are better, more elegant, more "correct" ways but the easiest thing I found was to use a system("command line command here") call to take a pic and then another to email the pic/video to myself and push it to dropbox and//or e...
by ElEscalador
Sun May 12, 2019 3:56 am
Forum: Advanced users
Topic: i am working on surveillance robot using Rpi 3 b+ need to good algorithm for self navigation
Replies: 5
Views: 470

Re: i am working on surveillance robot using Rpi 3 b+ need to good algorithm for self navigation

Look up A*? Or go with ROS and try gmapping or hector...not really enough info and likely gps alone will not be adequate. There is so much error in sensors that typically a bunch are used and the data fused and vetted. indoor? Outdoor?
by ElEscalador
Tue Apr 09, 2019 1:19 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Detecting AC current using DC transformer
Replies: 4
Views: 471

Re: Detecting AC current using DC transformer

The issue I would be wary of is you ac-dc converter may not (or may, I don't know anything about it) be filtered enough to prevent the pin from reading low 50 or 60 times/second. This could be handled with software debouncing... I also might wonder if that supply might start with a big voltage spike...
by ElEscalador
Fri Mar 01, 2019 10:37 pm
Forum: Automation, sensing and robotics
Topic: How to use accelerometer to monitor rotating machine health
Replies: 2
Views: 250

Re: How to use accelerometer to monitor rotating machine health

What are you looking to find? Changes in velocity? Wobble from perhaps bad bearings? Not sure what you need, but it sounds like you have more problems with the physics than the device usage? The units you read are in milliG's (from the couple that I've used), sometimes configurable to output meters ...
by ElEscalador
Fri Mar 01, 2019 10:30 pm
Forum: Beginners
Topic: Question about writing code on/for the Pi
Replies: 15
Views: 519

Re: Question about writing code on/for the Pi

I personally find it easiest to vnc into my pi and develop directly on it that way, but once in a while I'll work on my laptop and send the files over - in the past I've used dropbox, more and more I use gitlab.
by ElEscalador
Thu Feb 28, 2019 3:36 pm
Forum: General discussion
Topic: PiCam V1.3 works but not V2 with Octopi?
Replies: 1
Views: 172

Re: PiCam V1.3 works but not V2 with Octopi?

Baffled... I can't get this v2 camera to fail on any other pi I have - (zero, 2b, 3B) with variously-aged distros, but still no go on the octopi...which should just be a raspbian distro with the octo-stuff preloaded. Although.... ...The octo is on the only 3B+ I own (accidental purchase - speed bump...
by ElEscalador
Thu Feb 28, 2019 3:31 pm
Forum: General discussion
Topic: Any chance of the SD Copier util working on ubuntuMatePi?
Replies: 3
Views: 191

Re: Any chance of the SD Copier util working on ubuntuMatePi?

Anyone know if the copier util is actually a program called piclone? That's all I can find on github.
by ElEscalador
Thu Feb 28, 2019 1:49 am
Forum: General discussion
Topic: Any chance of the SD Copier util working on ubuntuMatePi?
Replies: 3
Views: 191

Any chance of the SD Copier util working on ubuntuMatePi?

Have a Pi running UbunutMate for ROS purposes and am a big fan of the GUI sd copier tool on Raspbian. Any chance of it working on Ubuntu Mate? And how might one go about installing it?
by ElEscalador
Thu Feb 28, 2019 1:44 am
Forum: General discussion
Topic: PiCam V1.3 works but not V2 with Octopi?
Replies: 1
Views: 172

PiCam V1.3 works but not V2 with Octopi?

New to Octopi - and it's working fine with a v1.3 camera on a new 3B+ but I tried to swap a V2 with a fisheye lens in place of the 1.3, but it refuses to stream or light up or anything. Checked my cables...even went back and forth a couple times and v1.3 just works and v2 does not. Verified the V2 a...
by ElEscalador
Mon Feb 25, 2019 4:54 pm
Forum: Troubleshooting
Topic: LIDAR and rasp
Replies: 2
Views: 123

Re: LIDAR and rasp

Yes, I have but also yes - we need more information to be helpful. We need type of lidar (model and manufacturer), what language are you using? Are you getting any data at all or is the device just not connecting? How is your device powered and connected?
by ElEscalador
Fri Feb 22, 2019 1:38 pm
Forum: Automation, sensing and robotics
Topic: Ultrasound sensor alternatives?
Replies: 11
Views: 1314

Re: Ultrasound sensor alternatives?

VL5xxx all the way, buuut - I ordered a couple and was disappointed that the manufacturer wanted me to install 25+pages worth of api instead of providing a normal register map like every I2C device in the world. Went with a 360 degree lidar instead and haven't gotten around to messing with it, but I...
by ElEscalador
Tue Feb 12, 2019 1:09 pm
Forum: General discussion
Topic: Pi to Pi python communication
Replies: 10
Views: 508

Re: Pi to Pi python communication

Nice, saving that.
by ElEscalador
Tue Feb 12, 2019 12:36 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Using both UARTs to monitor/inject data
Replies: 2
Views: 224

Re: Using both UARTs to monitor/inject data

If I understand what you want to accomplish, you may not need two uarts - to me it sound like you can use just the rx pin to listen to the keyboard, and just the tx pin for sending to the Atari. Unless you need to read AND write to these devices, in which case... You could try bit-banging with pigpi...
by ElEscalador
Sat Feb 09, 2019 1:41 pm
Forum: General discussion
Topic: Pi to Pi python communication
Replies: 10
Views: 508

Re: Pi to Pi python communication

1. Allegedly MQTT..it's cool and probably easier with python - I had some hiccups with C++ but it's great once it works. 2. Little uart tx/rx wireless transceiver chips of all sorts out there pretty cheap now. Then you can just use uart comms like the PIs were just wired together. More parts, but so...

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