Go to advanced search

by btidey
Fri Apr 19, 2019 3:23 pm
Forum: Automation, sensing and robotics
Topic: Can a power line provide Raspberry Pi and a lamp with power?
Replies: 16
Views: 766

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

I know there have been lots of articles about neat wifi 6 features helping IoT but ... ax is not even ratified yet, (Q3 2019?) some pre-ratification products are only just starting to appear (Samsung 10), and your router will need an upgrade. A lot of IOT is quite usable today without the extra feat...
by btidey
Fri Apr 19, 2019 7:55 am
Forum: Automation, sensing and robotics
Topic: Voltage Datalogger (please help out a noob)
Replies: 6
Views: 423

Re: Voltage Datalogger (please help out a noob)

One idea to remove the problem of hazardous working is to use a plug in AC-AC power adapter that gives out a low voltage like 5V. It is important that it is AC output as that will be just an isolation transformer and not a regulated dc supply. It is also important to get one with a safety certificat...
by btidey
Thu Apr 11, 2019 7:06 am
Forum: General discussion
Topic: Use a Potentiometer to control sound.
Replies: 5
Views: 211

Re: Use a Potentiometer to control sound.

If you want a rotary control for the volume then consider using a rotary encoder instead of a potentiometer. An encoder can connect to a couple of GPIO pins and then rotation can be detected and turned into a 'value to control the volume digitally. Rotary encoders do not have an absolute position bu...
by btidey
Fri Mar 15, 2019 9:32 am
Forum: Beginners
Topic: Why my IR LED transmitter not transmit any signal?
Replies: 43
Views: 1530

Re: Why my IR LED transmitter not transmit any signal?

The original circuit is bad There is nothing specifically to limit the current drawn through the two diodes and the transistor. The voltage drop across an IR LED is about 1.5V so with 2 in series and a 5V supply the current will be determined just by the gain of the transistor and the capacity of th...
by btidey
Fri Mar 01, 2019 9:11 am
Forum: General discussion
Topic: Need an outdoor case for a security camera
Replies: 13
Views: 658

Re: Need an outdoor case for a security camera

I want it to look like a CCTV camera though, because it's a visible deterrant. The original project I followed was here https://www.raspberrypi.org/blog/turn-your-pi-into-a-low-cost-hd-surveillance-cam/ however the dummy one suggested here is too small for the Pi3 (which has the micro USB power in ...
by btidey
Thu Feb 28, 2019 11:26 am
Forum: General discussion
Topic: Need an outdoor case for a security camera
Replies: 13
Views: 658

Re: Need an outdoor case for a security camera

I think this one https://cpc.farnell.com/haydon/hay-772city/dummy-camera-external/dp/SR07209?MER=sy-me-pd-mi-alte would be big enough, but it's a pretty solid unit and expensive. This one also looks a possible https://www.ebay.co.uk/itm/Dummy-Security-CCTV-Camera-Quality-Aluminium-Fully-Weather-Proo...
by btidey
Thu Feb 07, 2019 9:20 am
Forum: General discussion
Topic: Does Raspberry Pi have enough power to control 50 LED's?
Replies: 6
Views: 278

Re: Does Raspberry Pi have enough power to control 50 LED's?

With that number of LEDs you should check out using WS2812B pixel LEDs. A single GPIO pin can control a whole string as they are wired in series. Each LED can be independently faded and have its colour set as each one is RGB. These LEDs are available as strips, circles, arrays or as individual dots....
by btidey
Tue Feb 05, 2019 8:46 am
Forum: Automation, sensing and robotics
Topic: understanding Alexa and Google assistant
Replies: 4
Views: 377

Re: understanding Alexa and Google assistant

Google search for control raspberry with Alexa. You will find lots of tutorials and projects on sites like instructables.
by btidey
Tue Feb 05, 2019 8:38 am
Forum: Beginners
Topic: port forwarding and linking to an already owned domain
Replies: 3
Views: 230

Re: port forwarding and linking to an already owned domain

I originally had an older model Verizon FIOS router with port forwarding working, but it broke and got replaced by a newer model where port forwarding seemed to be non-functional. This was not a problem for me as I already had a router behind this (running Tomato software) to give better wifi covera...
by btidey
Sun Jan 27, 2019 1:10 pm
Forum: Automation, sensing and robotics
Topic: understanding Alexa and Google assistant
Replies: 4
Views: 377

Re: understanding Alexa and Google assistant

There are many books on Alexa but most focus on using the service rather than understanding how it works. The Dummy books are quite good. There is no simple answer to your question on protocols, commands etc. as it varies according to what you are doing. Essentially there is a potentially a long pip...
by btidey
Fri Jan 11, 2019 8:39 am
Forum: Automation, sensing and robotics
Topic: 433Mhz Reciever for existing devices
Replies: 23
Views: 27613

Re: 433Mhz Reciever for existing devices

By the way, I also tried to run the same library and the python "rpi-rf" library on a Rasberry Pi 3, but receiving signals seams to be much worse compared to the Arduino. (Using the same receiver hardware) The rc-switch code only detects the signal about every 30 seconds instead of every second and...
by btidey
Wed Jan 09, 2019 9:44 pm
Forum: Automation, sensing and robotics
Topic: 433Mhz Reciever for existing devices
Replies: 23
Views: 27613

Re: 433Mhz Reciever for existing devices

Yes. That sounds promising. 1963815 is the decimal equivalent of 0x1DF727 which is what I though t the message was. I am not familiar with how that config works but I guess it is definitions are base clock period and then how header 0 and 1 are made up. So 1,2 (700/1400 for a zero and 700/2800 for a...
by btidey
Wed Jan 09, 2019 9:26 am
Forum: Automation, sensing and robotics
Topic: 433Mhz Reciever for existing devices
Replies: 23
Views: 27613

Re: 433Mhz Reciever for existing devices

The message is repeated twice in your sequence and is consistent each time. It looks to me like the basic structure is Leading sync consisting or 8ms on, 1msec off The following pulses are either 760uSec, 1420 uSec, or 2760uSec. There can be some timing distortion reading pulses so lets call these 7...
by btidey
Mon Dec 24, 2018 9:32 am
Forum: Automation, sensing and robotics
Topic: 433Mhz Reciever for existing devices
Replies: 23
Views: 27613

Re: 433Mhz Reciever for existing devices

It is common to use 433MHz to transmit data from stations like this, but no guarantees. You can check this out by using a low cost usb dvb-t tv stick as a spectrum analyser. See https://www.rtl-sdr.com/ Establishing the frequency of transmission is just the first step. You then have to work out how ...
by btidey
Wed Dec 05, 2018 9:26 am
Forum: General discussion
Topic: How to read weather station sensor over 433MHz?
Replies: 17
Views: 1837

Re: How to read weather station sensor over 433MHz?

I think you will need to vary the temp and humidity a bit around the sensor to see how the data changes Maybe something like first part is a fixed address followed by select address bits and then data/ Taking the bit encoding you suggest then from bit 17 onwards the nibbles are 0E631 If the first 3 ...
by btidey
Fri Nov 30, 2018 8:58 am
Forum: Automation, sensing and robotics
Topic: 433Mhz Reciever for existing devices
Replies: 23
Views: 27613

Re: 433Mhz Reciever for existing devices

There are 2 basic types of receivers; super-regenerative and super-heterodyne. The first sort is like the first type you posted. They are very cheap but also tend to have poor range. The superhet types have better range and are more stable. They are not significantly more expensive. Search for RXB6 ...
by btidey
Mon Nov 19, 2018 8:26 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 123
Views: 15061

Re: Reading old weight scale

If you are trying to re-use most of the original scale then one approach would be to read the signals that drove the LCD display. This would need a bit of research to work out what they are and how to input them into the GPIO of the Pi. You don't show the LCD display in the pictures but it is likely...
by btidey
Thu Oct 25, 2018 8:23 am
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4955
Views: 1225882

Re: RPi Cam Web Interface

How would I go about using RPi-Cam-Web-Interface over local wifi access point / connecting with phone to wifi of raspberry pi without going over router? If you set the raspberry Pi up as an AP (access point) then it behaves like a wifi router. You can then scan wifi on your phone and connect to the...
by btidey
Wed Oct 24, 2018 9:55 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4955
Views: 1225882

Re: RPi Cam Web Interface

Robert I had videos that were locked and I had a day of videos today that all had busy against them so I deleted all, the videos that were locked have also deleted. Yes. I can confirm that happens. Strange as the files are set to read only. Under investigation. It looks like the php unlink used in ...
by btidey
Wed Oct 24, 2018 9:38 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4955
Views: 1225882

Re: RPi Cam Web Interface

Gary Littlemore wrote:
Wed Oct 24, 2018 9:25 pm
Robert

I had videos that were locked and I had a day of videos today that all had busy against them so I deleted all, the videos that were locked have also deleted.
Yes. I can confirm that happens. Strange as the files are set to read only.

Under investigation.
by btidey
Thu Oct 18, 2018 2:13 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4955
Views: 1225882

Re: RPi Cam Web Interface

Oh, this is what's in the "Convert using" box: /usr/bin/ffmpeg -f image2 -i i_%05d.jpg Are you running latest version? There was a fix for the time lapse command put in last week. If the time lapse command fails then the file will say Busy as the lack of a .mp4 file is what triggers that. The log s...
by btidey
Thu Oct 18, 2018 10:37 am
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4955
Views: 1225882

Re: RPi Cam Web Interface

How long should it take to convert a timelapse sequence? I only tried it for the first time this morning. It captured 198 frames. It's been going for quite a while now and still says "Busy". I just wondered how long to expect it to take. I guess it depends on the resolution but I'm just after an id...
by btidey
Tue Oct 16, 2018 3:06 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4955
Views: 1225882

Re: Installation fails if install.sh tries to enable the camera.

Just a small gotcha with the installation instructions on elinux.org: If the camera is not enabled when you run install, it tries to enable the camera from user level (assuming you don't add sudo on the front of "./install.sh"), this fails, and then you get non stop rude messages from the server. Y...
by btidey
Tue Oct 16, 2018 10:34 am
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4955
Views: 1225882

Re: RPi Cam Web Interface

Yes that is nice. On a related notes, one small problem I faced is: You do a delete all. And then you do a refresh (F5). It does a delete all again. Perhaps this was intended But it seems a bit unexpected. I think that might be browser dependent. The deleteAll submits a form action. If the browser ...
by btidey
Mon Oct 15, 2018 9:57 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4955
Views: 1225882

Re: RPi Cam Web Interface

Latest version has a feature request added to the download / preview page.

2 buttons allow selected captures to be locked and unlocked. Locked captures are read only and won't be deleted or purged. You can see which captures are locked as their thumbnails do not have a little delete button.

Go to advanced search