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by DaveH
Sun Sep 09, 2018 9:21 pm
Forum: Troubleshooting
Topic: Console hang with Pi 3 and Waveshare 3.2
Replies: 1
Views: 272

Re: Console hang with Pi 3 and Waveshare 3.2

After a lot of playing around, it seems that this problem affects the Pi ZeroW too when upgraded to the latest Stretch. It looks like it is a bug affecting the console only (X works fine) for the latest drivers only. I have mailed Waveshare for support and will post back here in case anyone else has...
by DaveH
Fri Sep 07, 2018 8:45 pm
Forum: Troubleshooting
Topic: Console hang with Pi 3 and Waveshare 3.2
Replies: 1
Views: 272

Console hang with Pi 3 and Waveshare 3.2

Can anyone offer any suggestions with a boot problem I have using a Pi 3 Model B+ and a Waveshare 3.2 touchscreen? I'm running the latest Octopi image, which reports as Raspbian Stretch 9.4 (It is a packaged Raspbian with the Octoprint 3d printer software already set up). I have installed the latest...
by DaveH
Wed Feb 28, 2018 8:59 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4955
Views: 1225307

Re: RPi Cam Web Interface

This may be simple, but I'm struggling to find an answer with googling... Is it possible to record still images using the RPi Cam Web interface on motion detect? I'm looking at using it in a birdbox and once they get busy nest building, they are going to trigger a lot of motions. If it records vide...
by DaveH
Sun Feb 25, 2018 4:26 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 4955
Views: 1225307

Re: RPi Cam Web Interface

This may be simple, but I'm struggling to find an answer with googling... Is it possible to record still images using the RPi Cam Web interface on motion detect? I'm looking at using it in a birdbox and once they get busy nest building, they are going to trigger a lot of motions. If it records video...
by DaveH
Sat Jan 28, 2017 1:16 pm
Forum: RISCOS
Topic: Free - RISC OS 3 Programmer's Reference Manuals
Replies: 2
Views: 4097

Free - RISC OS 3 Programmer's Reference Manuals

I have a full set of RISC OS 3 Programmers Reference Manuals that I'm struggling to find a good home for. Would they be use to any of the users of this forum, especially those trying to get retro games going? I'd hate to just throw them away. They are a heavy stack of 4 books, so my preference would...
by DaveH
Mon Dec 19, 2016 9:28 am
Forum: Scratch
Topic: Scratch and Neopixels
Replies: 4
Views: 3201

Scratch and Neopixels

I'm wondering if anyone can think of a way I can drive some Neopixels from Scratch on a Pi, so I can let the kids have a play with them? I have a 16 LED unit in a 4x4 grid. I'm using a Pi 2B, but have other flavours available should that make a difference. Using the Adafruit python library, I have h...
by DaveH
Thu Nov 06, 2014 8:55 pm
Forum: Automation, sensing and robotics
Topic: Meteorite camera project Meteotux_PI
Replies: 16
Views: 5235

Re: Meteorite camera project Meteotux_PI

Interesting project, thanks for posting this. I'm currently working on a wildlife trail camera for use at night. While that will have some IR LEDs and a PIR, I have been thinking that what I will end up with is a Pi NoIR camera in a weather proof box and a tripod mount. What I actually use it for wi...
by DaveH
Thu Oct 30, 2014 9:54 pm
Forum: Automation, sensing and robotics
Topic: Soil Humidity Sensor
Replies: 4
Views: 3713

Re: Soil Humidity Sensor

Sorry, I forgot to check back on this. I used between 5-10m of speaker cable to my sensors and it was fine, though I did find one give an erratic graph, while the other was fairly smooth. It followed an average curve of the soil drying out, but seemed to read +-50 between readings. I have never comp...
by DaveH
Sun Oct 19, 2014 10:39 am
Forum: Automation, sensing and robotics
Topic: Soil Humidity Sensor
Replies: 4
Views: 3713

Re: Soil Humidity Sensor

Those work well, I bought a couple. There are two ways to use them. There is a potentiometer on them and a red LED. You can tune this LED to come on when the soil is too dry and then read that as a digital input straight into the GPIO. This will give a plain yes/no as to the soil being too dry. The ...
by DaveH
Sat Oct 18, 2014 6:56 pm
Forum: Automation, sensing and robotics
Topic: Turn on 5v LCD from GPIO
Replies: 5
Views: 1531

Re: Turn on 5v LCD from GPIO

On the adafruit python library, I have found a noDisplay() function, which I assume will reduce usage further. If the current is that low to start with, I agree there is probably no point in trying to switch it too.

Many thanks to those who responded.
by DaveH
Sat Oct 18, 2014 3:55 pm
Forum: Automation, sensing and robotics
Topic: Turn on 5v LCD from GPIO
Replies: 5
Views: 1531

Re: Turn on 5v LCD from GPIO

Sorry, I should have made myself clearer. I want to programmatically power on the LCD, display a couple of short messages and power off again. Just going to pin 2 or 4 will permanently power it.
by DaveH
Sat Oct 18, 2014 3:39 pm
Forum: Automation, sensing and robotics
Topic: Turn on 5v LCD from GPIO
Replies: 5
Views: 1531

Turn on 5v LCD from GPIO

I have a standard 16x2 LCD which I want to be able to power on and off to save power consumption. Doing the backlight via a GPIO pin works fine but the LCD power will not run off it as it is a 5v board and the GPIO only supplies 3.3v. I have the LCD ground directly to the PI ground. In my supplies, ...
by DaveH
Fri Nov 29, 2013 2:29 pm
Forum: Automation, sensing and robotics
Topic: Using two power supplies
Replies: 1
Views: 465

Using two power supplies

I have a 12v solenoid water valve I wish to look at controlling from my pi. There are a number of diagrams that say use the 3.3v GPIO output from the pi to drive a transistor and run the larger voltage between the collector and emitter. Is it safe to tie the grounds of two power supplies together? T...
by DaveH
Tue Nov 19, 2013 9:57 pm
Forum: Automation, sensing and robotics
Topic: Water soil moisture sensor
Replies: 4
Views: 31818

Re: Water soil moisture sensor

Did you get anywhere with this? I bought a couple of these sensors and they come with no documentation. I've been having a play. The circuit board comes with 6 pins. Two at the bottom connect to the sensor and the 4 at the top are for the data. Reading left to right these are: Analogue out : Digital...

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