Go to advanced search

by riataman
Tue Sep 22, 2015 8:41 pm
Forum: General discussion
Topic: Long connection to relay
Replies: 3
Views: 580

Re: Long connection to relay

Either will work. I have run 5mts wires carrying 5V to activate a relay out of a raspberry pi. I used UTP cable (ethernet cable) and ran cables to two different relays.
by riataman
Fri Aug 07, 2015 3:10 pm
Forum: General discussion
Topic: Gstreamer performance in RPI2 comparing to RPI1
Replies: 2
Views: 746

Re: Gstreamer performance in RPI2 comparing to RPI1

You don't say what kind of issue you are observing (other than the cpu going to 50%) does the video display slows down. The machine becomes unresponsive? If you are only using 50% of you cpu that means you are not CPU bound. If you switch to a RBP2 that will certainly decrease the cpu load as each g...
by riataman
Thu Jul 30, 2015 8:53 pm
Forum: General discussion
Topic: Powering Multiple Pi's
Replies: 15
Views: 2429

Re: Powering Multiple Pi's

This was the first ElCheapo power supply that I found: http://www.newegg.ca/Product/Product.aspx?Item=N82E16817190036&cm_re=power_supply_500w-_-17-190-036-_-Product It claims that it can do 22A on the 5V rail. The recommended power supply for RBP2 is 1.8A. So that PSU should be good for about a doze...
by riataman
Thu Jul 30, 2015 8:44 pm
Forum: General discussion
Topic: Powering Multiple Pi's
Replies: 15
Views: 2429

Re: Powering Multiple Pi's

You might be able to use a computer PSU. Those already output the required 5V and you can draw high current from them. As an added bonus they also give 3V3 and 12V in case you want to connect additional stuff.
by riataman
Thu Jul 30, 2015 3:23 pm
Forum: Automation, sensing and robotics
Topic: Wireless Reed Sensors
Replies: 1
Views: 985

Re: Wireless Reed Sensors

Hey for some reason your links won't load for me. But one suggestion to make wireless reed sensors would be to something like this: http://www.anthonyvh.com/2014/01/08/wireless-quiz-buttons/ This guy used an arduino mini and a cheap 433mhz transmitter to make game buzzer, you could to the same and j...
by riataman
Thu Jul 23, 2015 8:12 pm
Forum: General discussion
Topic: 56k Modem with Raspberry Pi
Replies: 17
Views: 3768

Re: 56k Modem with Raspberry Pi

Forget about the modem. Get a FXS ATA. This is the first google hit I got: http://www.voipsupply.com/cisco-spa122 but there are a lot of brands. This is a device that connects to the phone and then to an ethernet work. This can convert the analog phone line signal to a SIP signal. Then forward the S...
by riataman
Thu Jul 23, 2015 7:15 pm
Forum: General discussion
Topic: How come chinese venders can sell RBI for cheap
Replies: 19
Views: 2361

Re: How come chinese venders can sell RBI for cheap

RS and Farnell in the UK will discount the RPi if buy in quantity, so obviously the reseller is using the discount to offer free shipping....... Economies of scale..... I think this is the main bit. Somehow I was under the impression that there were no discounts even if buying in bulk. Now rereadin...
by riataman
Wed Jul 22, 2015 8:40 pm
Forum: General discussion
Topic: How come chinese venders can sell RBI for cheap
Replies: 19
Views: 2361

How come chinese venders can sell RBI for cheap

Hey, I was looking for the cheapest place to grab a RBP 2 from México. I found chinese vendors like this one: http://www.aliexpress.com/item/In-stock-made-in-United-Kingdom-2015-New-Original-Raspberry-Pi-2-Model-B-Broadcom-BCM2836/32301186032.html They have what they claim is a genuine RBP 2 B made ...
by riataman
Tue Jul 21, 2015 10:49 pm
Forum: Español
Topic: RPI no apaguer el tv
Replies: 6
Views: 852

Re: RPI no apaguer el tv

Puede ser que raspberry pi apgue la television usando CEC. Checa este thread en como desabilitarlo viewtopic.php?f=91&t=26302
by riataman
Wed Jul 08, 2015 4:35 pm
Forum: Python
Topic: Continues graph print like in Oscilloscope
Replies: 6
Views: 903

Re: Continues graph print like in Oscilloscope

You need to print it continuously to paper?
by riataman
Tue Jul 07, 2015 11:21 pm
Forum: Advanced users
Topic: Transporting internet via GPIO
Replies: 6
Views: 924

Re: Transporting internet via GPIO

From http://codeandlife.com/2015/03/25/raspberry-pi-2-vs-1-gpio-benchmark/ the Rbp 2 can do 41.7 MHz on the GPIO pins. Ethernet 10Base-T needs operates on a 2.5Mhz frequency. So if you are so want to experiment for the sake it it could be possible to emulate a full ethernet port using the GPIO pins....
by riataman
Tue Jul 07, 2015 11:13 pm
Forum: Advanced users
Topic: 360 degree camera
Replies: 6
Views: 3179

Re: 360 degree camera

I have an inexpensive chinese IP camera that can rotate about 320 degrees, but the lens is so wide that it easily can have vision of the whole 360 degrees. The camera pan and tilt can be controlled from the PI using simple http requests (using curl from a shell script for example) and video and stil...
by riataman
Tue Jul 07, 2015 11:10 pm
Forum: Beginners
Topic: [SOLVED] mail command line: no aggregation of conversation
Replies: 2
Views: 654

Re: mail command line: no aggregation of thread/conversation

message_local="Door was opened: `date`" echo "$message_local" |mail "-a References: <0NR4[email protected].ip.XXXXXXX.XX>" -s "door activity" [email protected].com Try it that way. It'll append a References header with a link to the message id that you posted. That will make mail clients thread ...
by riataman
Tue Jul 07, 2015 5:26 pm
Forum: Automation, sensing and robotics
Topic: Signaling GPIO input pin using an external AC adapter
Replies: 10
Views: 1570

Re: Signaling GPIO input pin using an external AC adapter

That's certainly not the way I wanted to do it. I wanted to use something like this: http://www.amazon.com/ACS712ELCTR-20A-GY-712-20A-Current-Sensor-Module/dp/B00CZ5IOX8 (I already have a ADC module hooked into my PI) Specially since what I'm trying to do is detect when somebody rings my (120VAC) do...
by riataman
Tue Jul 07, 2015 5:05 pm
Forum: Automation, sensing and robotics
Topic: Signaling GPIO input pin using an external AC adapter
Replies: 10
Views: 1570

Re: Signaling GPIO input pin using an external AC adapter

This is how I intend to do it. I think the raspberry pi should be pretty much isolated?
by riataman
Tue Jul 07, 2015 4:52 pm
Forum: Automation, sensing and robotics
Topic: Signaling GPIO input pin using an external AC adapter
Replies: 10
Views: 1570

Re: Signaling GPIO input pin using an external AC adapter

ok. that makes sense. Thanks.

I'll use a relay that I have laying around that works with 6V in the same spirit than the opto-isolator circuit that you describe
by riataman
Tue Jul 07, 2015 4:26 pm
Forum: Automation, sensing and robotics
Topic: Signaling GPIO input pin using an external AC adapter
Replies: 10
Views: 1570

Re: Signaling GPIO input pin using an external AC adapter

I'm not connecting the two different GNDs. The reallity is a little more complicated, but I wrote it that way to simplify. Actually I only could find a 6V ac adapter. So I'm using a 50% voltage divider to set it down to 3V. Paint diagram attached.
by riataman
Tue Jul 07, 2015 4:18 pm
Forum: Automation, sensing and robotics
Topic: +3.3 max amperage
Replies: 4
Views: 576

Re: +3.3 max amperage

Is there really any way to experiment with this other than to keep drawing current until it blows?
by riataman
Tue Jul 07, 2015 4:14 pm
Forum: Automation, sensing and robotics
Topic: Signaling GPIO input pin using an external AC adapter
Replies: 10
Views: 1570

Signaling GPIO input pin using an external AC adapter

Hey I'm trying to make a project where I need to detect the presence of 120V AC voltage. The easiest way I could think of was to plug an old 3V power supply I had lying around to the mains voltage and then feed the 3V line to a raspberry pi input. It sounds like it should work in theory, but it prac...
by riataman
Thu Jun 25, 2015 11:56 pm
Forum: Python
Topic: Python GPIO pin behaves erratically (solved))
Replies: 1
Views: 358

Re: Python GPIO pin behaves erratically

Ok, I feel stupid now. The wiring of my pull down circuit was wrong. I would have figured this much earlier if not because when you use the files in /sys/class/gpio the software pull down is set to low by default. When you run a python script without specifying a pull resistor it sets it to none, th...
by riataman
Thu Jun 25, 2015 11:00 pm
Forum: Python
Topic: Python GPIO pin behaves erratically (solved))
Replies: 1
Views: 358

Python GPIO pin behaves erratically (solved))

Hey there, I'm having some trouble with python and gpio input pins. I wired the gpio pin with a pull down resistor like the one described here: https://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/robot/buttons_and_switches/ Everything works fine when I use the /sys/class/gpio stuff to read the i...
by riataman
Fri Jun 12, 2015 10:46 pm
Forum: Automation, sensing and robotics
Topic: Cable management suggestions
Replies: 2
Views: 510

Cable management suggestions

Hey there from Mexico, I just got a RBP a few week ago for a project of automating my home. I have already prototyped and tested a solution to automate: Two front gates using a relay each for open/close and a reed switch on each to detect open/closed status. The front light with a relay for off/on (...

Go to advanced search