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by btidey
Sat Aug 25, 2018 8:27 am
Forum: General discussion
Topic: Switching LED array using R Pi and MOSFET
Replies: 7
Views: 229

Re: Switching LED array using R Pi and MOSFET

Your circuit won't work, as its essentially a "drain follower", the LED's strings (including the resistor) won't get 12V, they will get 3.3V minus the gate-drain voltage needed to open the FET. Instead you should connect the drain to GND, and attach the LED's between 12V, and the source of the FET,...
by btidey
Sat Aug 25, 2018 8:18 am
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: RPi Cam Web Interface

Couple of questions... 1. Shutter speed. I've just discovered this and what a difference it makes! I've got a camera by my front door. After dusk, it's pretty much useless. I set the shutter speed at various values up to 6,000,000 (despite the page saying that 330,000 is the max) and it turns it fr...
by btidey
Thu Aug 23, 2018 11:52 am
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: RPi Cam Web Interface

Latest version includes some recent functionality request. 1. System attempts to convert any left over h264 files. Normally these will have been converted to mp4, but as this is done asynchronously it is possible that some have not been processed if the camera system is shutdown while conversions a...
by btidey
Tue Aug 21, 2018 8:18 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: RPi Cam Web Interface

I try to change the date and time with this function but without success (Standalone case) It also allows editing of the macro script names and the manual setting of the Raspberry Pi date/time. Normally the date / time is maintained automatically by NTP when Raspberry is connected to internet. In s...
by btidey
Tue Aug 21, 2018 4:52 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: RPi Cam Web Interface

Hi all I'm experimenting at the moment. I want to use the camera as motion sensor to run a command: DISPLAY=:0 xdotool key ctrl+q I've read the bit in the instructions about macros but I don't seem to be getting the idea - not even where to start. Is there a step by step tutorial somewhere? Cheers ...
by btidey
Tue Aug 21, 2018 4:36 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: Delete from DropBox

Hi, I'm using this excellent system with the also-excellent 'Dropbox Uploader' script. However, I have to manually remove files from my DropBox to stop it filling up. I would like to modify 'preview.php' so that if I click the 'cross' button to delete a recording or image, it also sends a delete co...
by btidey
Tue Aug 21, 2018 4:24 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: RPi Cam Web Interface

Latest version includes some recent functionality request. 1. System attempts to convert any left over h264 files. Normally these will have been converted to mp4, but as this is done asynchronously it is possible that some have not been processed if the camera system is shutdown while conversions ar...
by btidey
Mon Aug 13, 2018 9:53 pm
Forum: Beginners
Topic: How to detect an old style wired doorbell only - nothing else
Replies: 20
Views: 499

Re: How to detect an old style wired doorbell only - nothing else

Personally I'd use the 10V ac to drive an opto. I would do the same. If the zener diode get damaged / broken, you don't blow up you (expensive) controller. Using an opto is a good method. I used the zener method as it was to hand, simple and with the resistor limiting any over-current. Zeners are v...
by btidey
Mon Aug 13, 2018 7:47 am
Forum: Beginners
Topic: How to detect an old style wired doorbell only - nothing else
Replies: 20
Views: 499

Re: How to detect an old style wired doorbell only - nothing else

Did you know that you are providing approximately - 0.8V to the input of your ESP8266 ;) . Instead of this: A resistor / zener diode clips this so a 0 - 3.3V 50 Hz pulse is fed into a GPIO pin. However, I find you code interesting and I need to take a closer look at it. Yes. That is true. It was lo...
by btidey
Sun Aug 12, 2018 10:17 am
Forum: Beginners
Topic: How to detect an old style wired doorbell only - nothing else
Replies: 20
Views: 499

Re: How to detect an old style wired doorbell only - nothing else

I have an instructable on interfacing into an old style doorbell unit. https://www.instructables.com/id/Door-Bell-Push-and-Temperature-Sensor/ This uses a ESP8266 (ESP-12F) unit. All is contained within the chime unit and it is powered by the bell transformer power. It reports over wifi. The softwar...
by btidey
Sun Aug 05, 2018 8:11 am
Forum: Beginners
Topic: temp sensing of 12 thermisors is this the right forum
Replies: 2
Views: 141

Re: temp sensing of 12 thermisors is this the right forum

This is certainly possible. To measure the thermistor each one needs to be fed via a fixed resistor from say the 3.3V supply. The voltage across the thermistor can then be used to calculate its resistance and therefore its temperature if you know the characteristics. You need a multi-channel ADC add...
by btidey
Fri Jul 20, 2018 8:55 am
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: RPi Cam Web Interface

If you installed in the default place (subfolder html web software in /var/www/html) and using the default port 80, then you access the camera by browsing to http://cameraIP/html where cameraIP is the ip address of your raspberry. If you were to install with a blank subfolder then the software is i...
by btidey
Fri Jul 20, 2018 8:46 am
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: RPi Cam Web Interface

Yes I am using both. I have a cron script generating timelapse JPG files. The script also renames the files and thumbnails and copies them over to the USB drive. The SD card is still being used for motion capture videos. The images are stored on the slower USB as long term storage. I find I have to...
by btidey
Thu Jul 19, 2018 9:43 am
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: RPi Cam Web Interface

Hello, New to this forum and unsure if this is the right place to post my small issue. I have setup my cam and it was accessible until last night. However, this morning when I login all I can see is the "Index of /" folder and no cam in view. Could someone please explain how I can troubleshoot this...
by btidey
Wed Jul 18, 2018 9:28 pm
Forum: Automation, sensing and robotics
Topic: Wireless soil moisture sensor
Replies: 47
Views: 1686

Re: Wireless soil moisture sensor

Sounds good. Couple of last remarks before you get stuck in. Those modules have a 3.2:1 divider between the external pin and the ESP8266 ADC so you can connect moisture sensor output straight in. The moisture sensors like I use have a fairly high output impedance (~10K) so best read by something wit...
by btidey
Wed Jul 18, 2018 9:00 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: RPi Cam Web Interface

The buttons don't turn yellow anymore. Update have just been made (6.4.23). Tnx for your help ! Strange. Still works for me. Is this an update on a different system? Note the javascript can be cached so that sometimes an older version can still be being used. Flush the browser data or sometimes hol...
by btidey
Wed Jul 18, 2018 5:52 pm
Forum: Automation, sensing and robotics
Topic: Wireless soil moisture sensor
Replies: 47
Views: 1686

Re: Wireless soil moisture sensor

As I said the integrated module may suit you if you want to keep the hardware effort to a minimum. You would get a usable if not the best battery life and youjust recharge when they run low. Don't however believe the 9800mAH claim for a 18650 LIPO battery. That is is pure mythology. Look at the revi...
by btidey
Wed Jul 18, 2018 9:50 am
Forum: Automation, sensing and robotics
Topic: Wireless soil moisture sensor
Replies: 47
Views: 1686

Re: Wireless soil moisture sensor

Those linked items are basically like the development boards I mentioned but with built in battery holder / charger. They are certainly fine for doing development but you won't get the ultimate battery life even when you put use sleep. They will typically draw 0.3 to 0.5mA in sleep due to the extra ...
by btidey
Tue Jul 17, 2018 4:59 pm
Forum: Automation, sensing and robotics
Topic: Wireless soil moisture sensor
Replies: 47
Views: 1686

Re: Wireless soil moisture sensor

Can you post links to the sensor you use and whatever boards you use for the battery powered solution? I didn't think of running 1 per pot, thought one controllong 8. Your way seems to make sense and be easier. Because it only sleeps for a little while, have you had the corrosion issues I've seen o...
by btidey
Tue Jul 17, 2018 10:37 am
Forum: Automation, sensing and robotics
Topic: Wireless soil moisture sensor
Replies: 47
Views: 1686

Re: Wireless soil moisture sensor

Just answering a couple more of your questions. The moisture sensors I use can be powered from 3.3 - 5V. Internally they use a LDO regulator. They could just be connected to the 3.3V supply for the ESP module but they do draw about 5mA supply current which would drain a battery powered solution. Tha...
by btidey
Tue Jul 17, 2018 10:21 am
Forum: Automation, sensing and robotics
Topic: Wireless soil moisture sensor
Replies: 47
Views: 1686

Re: Wireless soil moisture sensor

Yes, the ESP8266 has 1 ADC input (and about 9 digital GPIO). One could add on a I2C multichannel analog chip, but I wouldn't do it that way myself. The modules are so cheap (~UKP 1.50) that I would just use just 1 per sensor. They all communicate back to the central point over wifi. That way you avo...
by btidey
Mon Jul 16, 2018 8:13 am
Forum: Automation, sensing and robotics
Topic: Wireless soil moisture sensor
Replies: 47
Views: 1686

Re: Wireless soil moisture sensor

Yes. Using esp8266 is a good solution here. It can also be made battery operated with very long battery life by using the deep sleep capability of the ESP8266 so that it wakes up at suitable intervals, takes a measurement and communicates it. I use it in a pot plant watering system. https://www.inst...
by btidey
Mon Jul 16, 2018 8:02 am
Forum: Beginners
Topic: Can I using wi-fi connect two pi's together without a hotspot?
Replies: 14
Views: 453

Re: Can I using wi-fi connect two pi's together without a hotspot?

You need one of the Pi's to be an access point (AP). This is like half of a hotspot.

See first part of https://www.raspberrypi.org/documentati ... s-point.md for a comprehensive tutorial.

Note that you could skip the dhcp part if you set up static ip addresses.
by btidey
Sun Jul 15, 2018 11:00 am
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: RPi Cam Web Interface

Sometimes I have remaining .h264 Files in the folder, which are not boxed. Mainly because of sudden powerout or stopping video und immediatly shutting down after. I know I can box with MP4Box like described in the manual, but is there no option in the Webinterface to box remaining h264 files? Or ev...
by btidey
Sat Jul 14, 2018 10:04 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4788
Views: 1039816

Re: RPi Cam Web Interface

I think the USB port is actually dodgy but it appears the reason it wasn't working was a little easier (and dumber!). I was using Raspbian Stretch not Raspbian Jessie! OK Good it is sorted now. Stretch is fine. Camera / software also works fine on Pi ZeroW which can be a nice platform for smaller c...

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