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by ElEscalador
Mon Nov 01, 2021 11:46 am
Forum: Automation, sensing and robotics
Topic: Whats the best technology to use for this project with pi
Replies: 7
Views: 513

Re: Whats the best technology to use for this project with pi

I feel like a web api or mqtt would be a normal thing to do but you could also just use a serial connection if they're close enough together.
by ElEscalador
Tue Oct 12, 2021 4:00 pm
Forum: Beginners
Topic: My first project
Replies: 2
Views: 147

Re: My first project

In addition to what WHH said (it does sound like a microcontroller like the pico or an arduino is more appropriate), you didn't mention what type of sensor you want to use to get speed data and we can't even advise that without knowing the type of transportation. Do you want to use GPS for a pedestr...
by ElEscalador
Mon Oct 04, 2021 12:13 pm
Forum: General discussion
Topic: Two-way data transfer between Pi's over a very long cable
Replies: 53
Views: 2650

Re: Two-way data transfer between Pi's over a very long cable

I suggest you forget about trying to boost voltage for comms and look at RS485 or other differential bus transceiver that will allow 1000+ meters of communications at 5v (Or was it 12..? it's been a minute). That's how I did the control for an ROV back in 90s. For handling connection at the spinny p...
by ElEscalador
Mon Sep 06, 2021 1:36 pm
Forum: Beginners
Topic: Control 10 wires with 5v
Replies: 13
Views: 662

Re: Control 10 wires with 5v

roller012 wrote:
Mon Sep 06, 2021 1:26 pm
Thank you very much, no, I will use one by one, so I need only transistors/relay board, can I power this board from 5v pin on GPIO?
No. Well.. you can probably power the board itself from the Pi's 5v, but you definitely cannot also use that 5v and pass it through to the controlled devices.
by ElEscalador
Thu Jul 15, 2021 12:19 pm
Forum: Beginners
Topic: Hi, help needed with what I assume is a simple project
Replies: 2
Views: 213

Re: Hi, help needed with what I assume is a simple project

A link to this keypad you want to use would be helpful. This is not a keyboard but some other buttons? You are picturing the Arduino wired to each key? The Pi can do that. Does it communicate with serial or I2C? The Pi can do that. Need more info.
by ElEscalador
Fri Jul 09, 2021 12:33 pm
Forum: Beginners
Topic: Which Raspberry Pi ?
Replies: 3
Views: 205

Re: Which Raspberry Pi ?

If you must use a Raspberry Pi you 100% want a Pi4 with at least 4 GB RAM.
by ElEscalador
Fri Jul 09, 2021 12:16 pm
Forum: Beginners
Topic: Adding multiple DS18B20 to raspberry pi
Replies: 3
Views: 252

Re: Adding multiple DS18B20 to raspberry pi

It's just a matter of daisy-chaining. I made a handful of these for a project using sodler-in screw terminals so I can replace an individual sensor and keep adding easily.

Image
by ElEscalador
Tue Jun 22, 2021 11:25 am
Forum: Automation, sensing and robotics
Topic: Complete beginner, Rubik's Cube robot Project
Replies: 6
Views: 1349

Re: Complete beginner, Rubik's Cube robot Project

Hi, after 5 months the Rubik's cube solver robot is finished: https://www.youtube.com/watch?v=oYRXe4NyJqs. It works fully autonomously, and in case a PC is connected, via SSH, some graphical info are sent by to the raspberry to the pc for a nicer visualization. It isn't very fast, it takes about 15...
by ElEscalador
Thu Mar 04, 2021 12:43 pm
Forum: Troubleshooting
Topic: 4 relay board using 3.3v pin problem
Replies: 35
Views: 1740

Re: 4 relay board using 3.3v pin problem

Most of the relay modules (speaking of the most common type we see Arduino and Pi hobbyists buying) are 5v, but their logic threshold is low enough that you can usually get away with 3.3 being "high enough" to do the job. I have had generic one that simply wouldn't work with less than 3.7 ...
by ElEscalador
Wed Mar 03, 2021 10:08 pm
Forum: Automation, sensing and robotics
Topic: PIR sensor always high (always detecting movement/heat)
Replies: 6
Views: 524

Re: PIR sensor always high (always detecting movement/heat)

Also make sure you understand the adjustment knobs and how the device works in general. This pages seems to have good info and the two knobs labeled toward the bottom. https://maker.pro/raspberry-pi/tutorial ... ry-pi-gpio
by ElEscalador
Wed Mar 03, 2021 2:13 pm
Forum: Ubuntu
Topic: What happened to the Pi Flavour Maker site?
Replies: 6
Views: 449

Re: What happened to the Pi Flavour Maker site?

Ahhh, thanks. Unfortunate, though I was able to find the torrent/magnet link for the lubuntu image previously there at https://lubuntu.net/downloads/.
by ElEscalador
Wed Mar 03, 2021 12:36 pm
Forum: Ubuntu
Topic: What happened to the Pi Flavour Maker site?
Replies: 6
Views: 449

What happened to the Pi Flavour Maker site?

Anyone have an inside scoop? Temporarily down or gone for good?
by ElEscalador
Mon Feb 22, 2021 1:30 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: SIM800L Strange Characters
Replies: 7
Views: 621

Re: SIM800L Strange Characters

As long as they're both the same it's fine. Generally, slower baud rates are more stable. Also check that the parity and stop bits match.
by ElEscalador
Mon Feb 22, 2021 1:28 pm
Forum: Beginners
Topic: MCP3008 is too slow for data transfer. How to solve it?
Replies: 35
Views: 1962

Re: MCP3008 is too slow for data transfer. How to solve it?

The first link gives a 404 not found. Then since.. I just can't tell which wire goes to what. I haven't used that exact photodiode but if the current-limiting resistor and the pull resistor is are sized appropriately, I'd think it should be able to overcome the pull and switch states just fine..alth...
by ElEscalador
Mon Feb 22, 2021 1:00 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: SIM800L Strange Characters
Replies: 7
Views: 621

Re: SIM800L Strange Characters

A device might sometimes send non-printable characters (for example, a number greater than 255 has to be sent as two bytes and re-combined on the receiving end. These separate bytes will generally look like garbage). But presuming you're sending known bytes that you wrote, I agree - baud rate seems ...
by ElEscalador
Mon Feb 22, 2021 12:37 pm
Forum: Beginners
Topic: MCP3008 is too slow for data transfer. How to solve it?
Replies: 35
Views: 1962

Re: MCP3008 is too slow for data transfer. How to solve it?

I have the same questions as twostage. By reading the photodiode directly I'd think you could achieve those speeds. At the very least, you could visualize the input with piscope and be assured your output is working and the receive circuitry is working. **Edit: you replied as I was typing. ** It may...
by ElEscalador
Mon Feb 15, 2021 1:28 pm
Forum: Beginners
Topic: looking for 3.3V => 220v relay
Replies: 17
Views: 1128

Re: looking for 3.3V => 220v relay

this one: RPiRelayBoard.jpg That one is NOT rated for 230V AC. Also I wouldn't want 230V AC running that close to my 3.3V Raspberry. There's too much risk of shock or electrocution. It's better to switch at low voltages (24V or lower) at the Raspberry and switch the 230V load with a contactor away ...
by ElEscalador
Mon Feb 15, 2021 1:13 pm
Forum: Automation, sensing and robotics
Topic: How to run/control Encoder Motor with MDD10A Cytron Motor Driver and Raspberry Pi using Python Code?
Replies: 2
Views: 666

Re: How to run/control Encoder Motor with MDD10A Cytron Motor Driver and Raspberry Pi using Python Code?

Your wiring looks ok - you are missing the power to the encoders (3.3v from pi or some other source). The encoders don't have different signals - they simply each pulse when the magnet passes the sensor. Usually (if not always?), the encoder output floats when there is no magnet and outputs LOW when...
by ElEscalador
Thu Feb 11, 2021 3:46 pm
Forum: Beginners
Topic: Wifi communication question/ concept
Replies: 6
Views: 221

Re: Wifi communication question/ concept

How fast is necessary? It seems simplest to simply connect both pi's to the same wifi network then you can publish your data with mqtt or such. I haven't test mqtt at all for speed, but I imagine it's not too different than ROS (Robot Operating System) in speed and we use that over wifi networks for...
by ElEscalador
Thu Feb 11, 2021 12:27 pm
Forum: Automation, sensing and robotics
Topic: Wireless Water Sensor
Replies: 2
Views: 329

Re: Wireless Water Sensor

I second the esp8266 for this. Get it on the same network as the Pi and you can use mqtt to share information.
by ElEscalador
Wed Feb 10, 2021 10:19 pm
Forum: General discussion
Topic: Git cloning an already cloned repository
Replies: 9
Views: 840

Re: Git cloning an already cloned repository

git pull ? WInner. git pull updates your local repo to whatever is the latest on the remote repo (assuming you haven't made conflicting changes locally). If for some reason you truly need to reclone the repo but are afraid of losing the one you have, rename your local folder. sudo mv repoFolderName...
by ElEscalador
Wed Feb 10, 2021 9:58 pm
Forum: Beginners
Topic: Add button to temperature sensors setup
Replies: 7
Views: 394

Re: Add button to temperature sensors setup

You'll leave the sensor circuit alone, and connecting a button to another pin won't change that at all. Again, a "how to read a button" tutorial will give you one of two ways to connect a button - either: 3.3v->button->gpio pin or gnd->button->gpio pin As long as it's a different gpio pin ...
by ElEscalador
Wed Feb 10, 2021 9:31 pm
Forum: Beginners
Topic: Add button to temperature sensors setup
Replies: 7
Views: 394

Re: Add button to temperature sensors setup

The first question is what language you are using? Regardless, first explore button reading tutorials. Then you can write something like while(1) // this means loop forever { if(button_is_pressed() ) //check the button { //read temp //display the temp } //sleep for a few milliseconds } Once you've l...
by ElEscalador
Wed Feb 10, 2021 12:48 pm
Forum: Beginners
Topic: detecting the presence of voltage - monitoring home boiler
Replies: 6
Views: 304

Re: detecting the presence of voltage - monitoring home boiler

If you're in the U.S., the chances are your boiler uses 24vac for the control signal but there is 110vac at the control board and going to any pumps. Please use a meter and triple check everywhere you plan to work. A typical U.S. boiler control system (residential) will have two wires going to the t...
by ElEscalador
Wed Feb 10, 2021 12:37 pm
Forum: Advanced users
Topic: Distinguish more one-wire sensors
Replies: 4
Views: 334

Re: Distinguish more one-wire sensors

They're one-wire sensors - they're intended to be used many on a single pin. Why not create a file with the sensor numbers and something descriptive like a name or location? Then when something is different than the file indicates the system knows something was replaced or added and the used can be ...

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