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by luchiand
Fri Aug 23, 2019 8:15 pm
Forum: Beginners
Topic: Can a data cable be at the same time an OTG cable?
Replies: 4
Views: 92

Re: Can a data cable be at the same time an OTG cable?

I understood from this movie that an USB data cable can be turned into OTG cable. So that I was thinking I have to make some changes or I need an adapter: https://www.youtube.com/watch?v=_Kv5lJKJhDg That is why I was so confused about this. That is a very good news to know that I do not need adapter...
by luchiand
Fri Aug 23, 2019 7:50 pm
Forum: Beginners
Topic: Can a data cable be at the same time an OTG cable?
Replies: 4
Views: 92

Can a data cable be at the same time an OTG cable?

I have a couple of Android devices, tablets and smartphones and for charging I use cables that are also for data transfer. I have also, a lot of spare cables like that. What I want to do is to connect a PI zero to a Raspberry PI 3 +. As I find on internet I need an OTG cable. As I understood these a...
by luchiand
Wed Aug 21, 2019 10:35 am
Forum: Beginners
Topic: More pi zero connected to a pi 3 via net hub or other network device?
Replies: 1
Views: 87

More pi zero connected to a pi 3 via net hub or other network device?

I want to make a device for panoramic pictures, 360 degree with some overlapping angles to prevent discontinuity. I need 8 pi zero units to do this and a pi 3 where I want to save them and do other things like email them, etc. I already can do those with a single pi 3. I will buy the new vesion of p...
by luchiand
Wed Jun 05, 2019 5:26 pm
Forum: Beginners
Topic: Can not enable VNC server even if it seems to be, can be caused by TightVNC?by
Replies: 1
Views: 137

Can not enable VNC server even if it seems to be, can be caused by TightVNC?by

I made the worst mistake to install TightVNC to use remote desktop from my laptop that is by default installed. I didn't know that VNC is much better but when I installed it on some tablets I saw that it doesn't create another desktop but accesses directly the existing one, so I can see exactly what...
by luchiand
Thu May 23, 2019 9:38 pm
Forum: Troubleshooting
Topic: Can the low voltage have an effect on RAM values?
Replies: 9
Views: 406

Can the low voltage have an effect on RAM values?

I put some more extensions and connections between one of my Raspberry and its original source. The longer the wires and the more connections, the higher the electrical resistance, then the lower voltage. Time to time I see the yellow lightning symbol on the top right corner on the screen. I have no...
by luchiand
Wed May 22, 2019 3:19 pm
Forum: Beginners
Topic: Question about adafruit fona gsm device family
Replies: 0
Views: 64

Question about adafruit fona gsm device family

I am working at a project where I need, between other things, to send SMSs and be connected to the Internet at the same time. I have a modem Huawei and I can do both things but not at the same time. It is like only ttyUSB2 can be used, even if the modem has attached two more: ttyUSB1 and ttyUSB3. Th...
by luchiand
Wed May 22, 2019 2:34 pm
Forum: Troubleshooting
Topic: Decimal dots for T1637 based Display and why the program crashes after hours.
Replies: 1
Views: 105

Decimal dots for T1637 based Display and why the program crashes after hours.

I have a Display controlled by an integrated T1637 circuit. I found a python library that controls my digits. Their example was a clock and it was not hard to change it for what I needed. The display has instead of the two clock dots, decimal dots, because I needed to display comma numbers. Strangel...
by luchiand
Sun May 19, 2019 8:01 am
Forum: Troubleshooting
Topic: Can I use 5V to power a display with tm1637 and control it by 3 V
Replies: 6
Views: 326

Re: Can I use 5V to power a display with tm1637 and control it by 3 V

It was my library on raspberry faulty. I put it on an Arduino first to make sure ir works. Then I found a better library and works on Raspberry, too. The only problem now is that I can not control the decimal dots. But I can put off that for a while.
by luchiand
Sun May 19, 2019 7:50 am
Forum: Beginners
Topic: Does somebody know if Adafruit has a branch in Europe?
Replies: 4
Views: 286

Re: Does somebody know if Adafruit has a branch in Europe?

Ypur information was very useful, thnk you.
by luchiand
Fri May 17, 2019 4:02 pm
Forum: Beginners
Topic: Does somebody know if Adafruit has a branch in Europe?
Replies: 4
Views: 286

Does somebody know if Adafruit has a branch in Europe?

Does somebody know if Adafruit has a branch in Europe? I opened an account on their site but I can not post new topics. I have now idea if they send their items from USA, as I found most of the components there. I live in dk and I'd like to buy some of their products, so that they are delivered fast...
by luchiand
Fri May 17, 2019 7:32 am
Forum: Beginners
Topic: Where can I find reliable wire jumpers?
Replies: 3
Views: 216

Where can I find reliable wire jumpers?

Where can I find some reliable wire jumpers?All the male connector are too thin. They never gets stuck and I could not insert them properly in the female connectors. The female "holes" are too large, also. I always have to change the shape of the male and even the female connectors, like a hook or s...
by luchiand
Thu May 16, 2019 9:41 pm
Forum: Python
Topic: Installed LAMP on Raspberry and PHP works strangely
Replies: 8
Views: 407

Re: Installed LAMP on Raspberry and PHP works strangely

I just forgot to change the extension. Works now.
by luchiand
Thu May 16, 2019 3:28 pm
Forum: Troubleshooting
Topic: Can I use 5V to power a display with tm1637 and control it by 3 V
Replies: 6
Views: 326

Re: Can I use 5V to power a display with tm1637 and control it by 3 V

I know that it can use also 3 or 5 V. I don’t know what color it ia. Blue would be very dim with 3 V..
by luchiand
Thu May 16, 2019 7:44 am
Forum: Troubleshooting
Topic: Can I use 5V to power a display with tm1637 and control it by 3 V
Replies: 6
Views: 326

Can I use 5V to power a display with tm1637 and control it by 3 V

I have a tm163 based display. Unfortunately the provider did not specify anything about the color. I did not care about the color when I bought it. The provider has not another one, so that there is no way to find if this information would have been available. I am afraid if it is blue, the 3 V is n...
by luchiand
Wed May 15, 2019 9:34 pm
Forum: Beginners
Topic: TM1637 Can not connect to raspberry zero
Replies: 1
Views: 96

TM1637 Can not connect to raspberry zero

TM1637 Can not connect to raspberry zero I found this configuration.: 4-digit LED Display Tube # D4 (GPIO2) ----- CLK # D3 (GPIO0) ----- DIO # 3V3 ------------ VCC # G -------------- GND on this link: https://github.com/depklyon/raspberrypi ... al/test.py But that is not the case for Raspberry Pi ze...
by luchiand
Sat May 11, 2019 2:38 pm
Forum: Python
Topic: Installed LAMP on Raspberry and PHP works strangely
Replies: 8
Views: 407

Re: Installed LAMP on Raspberry and PHP works strangely

I tried : [email protected]:~ $ sudo a2enmod php7.0 I GOT THIS: Considering dependency mpm_prefork for php7.0: Considering conflict mpm_event for mpm_prefork: Considering conflict mpm_worker for mpm_prefork: Module mpm_prefork already enabled Considering conflict php5 for php7.0: Module php7.0 already ...
by luchiand
Sat May 11, 2019 2:29 pm
Forum: Python
Topic: Installed LAMP on Raspberry and PHP works strangely
Replies: 8
Views: 407

Re: Installed LAMP on Raspberry and PHP works strangely

Well, I have another application that transmits data from one raspberry pi 3 to a raspberry pi zero via sockets. It works nice but if i stop the client or the server and start again I got an error message as if the socket is used by another application. Sometimes I have to wait a lot or reboot to so...
by luchiand
Sat May 11, 2019 11:28 am
Forum: Python
Topic: Installed LAMP on Raspberry and PHP works strangely
Replies: 8
Views: 407

Installed LAMP on Raspberry and PHP works strangely

I installed Appache server and I tested with some html and javascript code. They work perfectly. I installed also PHP but when I try to run it I have a lot of strange mistakes. Ex. from w3schools that is supposed to run very well: <!DOCTYPE html> <html> <body> <?php $txt1 = "Learn PHP"; $txt2 = "W3S...
by luchiand
Thu May 09, 2019 12:21 pm
Forum: Troubleshooting
Topic: False triggering.
Replies: 3
Views: 160

Re: False triggering.

Nobody gets in garage at this time. The sensor can not be triggered by cold objects and nothing moves there except the mice I want to detect, I experimented this. I've repeated the experiment inside for 10 hours, where I have a lot of devices around the experimenting table and very close to Raspberr...
by luchiand
Wed May 08, 2019 10:46 am
Forum: Troubleshooting
Topic: False triggering.
Replies: 3
Views: 160

False triggering.

I have a Panasonic analog motion sensor connected through AdaFruit Analog-Digital converter to Raspberry PI 3 B+ . It starts a camera and some IR LEDs to make some movies and pictures. When I test it inside, it works well and I have no false triggering. I try another digital one from Adafruit but it...
by luchiand
Wed May 08, 2019 7:59 am
Forum: Python
Topic: I wrote a program in Python but I want to send data to a JavaScript program
Replies: 6
Views: 340

Re: I wrote a program in Python but I want to send data to a JavaScript program

I have already written in python 4 programs. They interact in a certain maner but I used files to comunicate. The files are writen each hour on the SD card and on an external drive, some pictures are saved when motions are detected. I have to work too much to rewrite the main program in another prog...
by luchiand
Tue May 07, 2019 7:36 pm
Forum: Python
Topic: I wrote a program in Python but I want to send data to a JavaScript program
Replies: 6
Views: 340

I wrote a program in Python but I want to send data to a JavaScript program

I have a program in Python that collects data from different sensors and I want to make some of this data used by a Java script. I can write them in a file on the SD card and read them from that file. But I need to display this values in real time. So I have to write and read too much on the SD card...
by luchiand
Mon May 06, 2019 3:18 pm
Forum: Beginners
Topic: A program used to send SMS doesn't work properly if I start it remotely.
Replies: 3
Views: 142

Re: A program used to send SMS doesn't work properly if I start it remotely.

What model of RPi board? Raspberry pi 3 b+ What Operating System is it running? Raspbian What is the connected dongle for? It is a Huawei E353 dongle. It is connected as I mentioned above, to control Raspberry remotely. Or I misunderstood this question? What is the code/script I use AT commands to ...
by luchiand
Mon May 06, 2019 1:22 pm
Forum: Beginners
Topic: A program used to send SMS doesn't work properly if I start it remotely.
Replies: 3
Views: 142

A program used to send SMS doesn't work properly if I start it remotely.

I have a dongle connected to Raspberry PI, a motion sensor and a camera. I have two more sensors for temperature and light. When the sensor detect a motion camera starts. I wrote a program (Python) that runs as a separate process to send SMSs with a status related to temperature and intensity of lig...
by luchiand
Fri Apr 26, 2019 7:11 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Usb dongle can use only ttyUSB2 and can conect to 3G when SMS is used
Replies: 0
Views: 164

Usb dongle can use only ttyUSB2 and can conect to 3G when SMS is used

Usb dongle can use only ttyUSB2. It is a Huawei E353. I need to use it to connect to 3G and at the same time to sent SMS. For the moment I can send SMS. It works nice. With sakis3g I can, based on a visual interface or a text console (but not command line), to connect to the internet via 3G. I think...

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