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by DougieLawson
Thu Jun 21, 2018 12:29 am
Forum: General discussion
Topic: Pi Is Too Complicated
Replies: 20
Views: 398

Re: Pi Is Too Complicated

Could you give an example of something that doesn't work on Stretch, that does work on Wheezy? What no longer works are the tutorials, learning resources and human knowledge base of how to do things. Moreover, it is difficult to make a case for creating soon-to-be-useless teaching resources when th...
by DougieLawson
Thu Jun 21, 2018 12:24 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: UART communication between Raspberry Pi 3 and PIC18F4550
Replies: 13
Views: 643

Re: UART communication between Raspberry Pi 3 and PIC18F4550

Code: Select all

#!/usr/bin/python3

bytes_1 = b'some bytes from serial here'
string_1 = bytes_1.decode()

print (bytes_1)
print (string_1)
by DougieLawson
Wed Jun 20, 2018 10:44 pm
Forum: Beginners
Topic: Using a cellphone to boost my Pi
Replies: 6
Views: 113

Re: Using a cellphone to boost my Pi

Imperf3kt wrote:
Wed Jun 20, 2018 10:13 pm
Can you boost the performance of your PC, with a phone?
It only works for my PC with my Android phone when I've got a tin-foil top hat on my head.
https://illuminaughtyboutique.wordpress ... your-mind/
by DougieLawson
Wed Jun 20, 2018 10:42 pm
Forum: Troubleshooting
Topic: Unable to fully set up phpmyadmin
Replies: 16
Views: 272

Re: Unable to fully set up phpmyadmin

Try starting with a fresh SDCard with a fresh copy of Raspbian and do nothing special other than
sudo apt update; sudo apt install apache2 phpmyadmin;
by DougieLawson
Wed Jun 20, 2018 10:10 pm
Forum: Troubleshooting
Topic: Unable to fully set up phpmyadmin
Replies: 16
Views: 272

Re: Unable to fully set up phpmyadmin

Have you tried running sudo /usr/sbin/mysqld --skip-grant-tables & to give you a chance to flush privileges and set a new known root password?
by DougieLawson
Wed Jun 20, 2018 9:44 pm
Forum: Troubleshooting
Topic: Unable to fully set up phpmyadmin
Replies: 16
Views: 272

Re: Unable to fully set up phpmyadmin

Have you tried resetting the root password?
viewtopic.php?p=1330914#p1330795
by DougieLawson
Wed Jun 20, 2018 9:32 pm
Forum: Python
Topic: How to simultaneously send and receive data between a laptop and raspberry pi?
Replies: 3
Views: 61

Re: How to simultaneously send and receive data between a laptop and raspberry pi?

MQTT with Mosquitto or RabbitMQ is what you're looking for.
by DougieLawson
Wed Jun 20, 2018 4:25 pm
Forum: Troubleshooting
Topic: Unable to fully set up phpmyadmin
Replies: 16
Views: 272

Re: Unable to fully set up phpmyadmin

There's a trivial procedure to reset a MySQL (or MariaDB) root password.

https://help.ubuntu.com/community/MysqlPasswordReset
by DougieLawson
Wed Jun 20, 2018 6:27 am
Forum: Troubleshooting
Topic: Unable to fully set up phpmyadmin
Replies: 16
Views: 272

Re: Unable to fully set up phpmyadmin

From a command line run mysql -u root mysql CREATE USER 'phpa'@'localhost' IDENTIFIED BY 'some_strong_password'; GRANT ALL PRIVILEGES ON *.* TO 'phpa'@'localhost' WITH GRANT OPTION; CREATE USER 'phpa'@'%' IDENTIFIED BY 'some_strong_password'; GRANT ALL PRIVILEGES ON *.* TO 'phpa'@'%' WITH GRANT OPTI...
by DougieLawson
Tue Jun 19, 2018 7:26 pm
Forum: Official Foundation Display
Topic: Raspberry Pi 7inch Touchscreen not working
Replies: 11
Views: 502

Re: Raspberry Pi 7inch Touchscreen not working

If you have an active 7" touch screen you can't have an active HDMI display. It's one or the other with the standard display drivers.
by DougieLawson
Tue Jun 19, 2018 6:21 pm
Forum: Troubleshooting
Topic: Wrong screen resolution of Raspbian in VNC Viewer
Replies: 5
Views: 140

Re: Wrong screen resolution of Raspbian in VNC Viewer

Start with a ls -la /sys/module/bcm2708_fb/parameters command. It should be obvious what I'm showing you.
by DougieLawson
Mon Jun 18, 2018 9:13 pm
Forum: Add-ons
Topic: [solved]thermal paste to get heat sink on cpu?
Replies: 5
Views: 127

Re: thermal paste to get heat sink on cpu?

A heatsink on a Zero is a waste of effort because it's next to impossible to get it running hot. A heatsink on a 3B+ may not be needed as the termal conduction of the CPU package and circuit board are an order of magnitude better than earlier models.
by DougieLawson
Mon Jun 18, 2018 8:45 pm
Forum: Add-ons
Topic: [solved]thermal paste to get heat sink on cpu?
Replies: 5
Views: 127

Re: thermal paste to get heat sink on cpu?

What model of Raspberry do you have and why do you think you need a heatsink?
by DougieLawson
Mon Jun 18, 2018 8:44 pm
Forum: Beginners
Topic: Access denied on SHH (password is correct, user is pi)
Replies: 15
Views: 392

Re: Access denied on SHH (password is correct, user is pi)

Easiest way to fix a broken password is to boot to an emergency root shell. If NOOBS use the recovery system to add systemd.unit=rescue.target to /boot/cmdline If PINN use the PINN password reset option in the PINN recovery system. No mucking about needed. If plain Raspbian, pull the card, edit F:\c...
by DougieLawson
Mon Jun 18, 2018 8:38 pm
Forum: General discussion
Topic: recent serial i/o tutorial
Replies: 11
Views: 298

Re: recent serial i/o tutorial

The RPi has five SPI CS lines between the two devices /dev/spidev0.0 /dev/spidev0.1 /dev/spidev1.0 /dev/spidev1.1 & /dev/spidev1.2 https://pinout.xyz/pinout/spi spidev0 == GPIO7 (CE0.1), GPIO8 (CE0.0), GPIO9 (MISO0), GPIO10 (MOSI0) & GPIO11 (SCLK0) spidev1 == GPIO 16 (CE1.2), GPIO17(CE1.1), GPIO18 (...
by DougieLawson
Mon Jun 18, 2018 5:37 pm
Forum: Python
Topic: Tripple button activated stopwatch
Replies: 7
Views: 256

Re: Tripple button activated stopwatch

gordon77 wrote:
Mon Jun 18, 2018 4:39 pm
Here's an example that might get you started...

viewtopic.php?t=204237
We've done that bit.
by DougieLawson
Mon Jun 18, 2018 5:33 pm
Forum: Troubleshooting
Topic: Raspbian OS unreachable after several hours of use
Replies: 26
Views: 595

Re: Raspbian OS unreachable after several hours of use

5. Something is leaking memory and the RPi is still running in swapping hell. It's just so desperately slow so it appears dead.

For that set up a one minute cron job to run a free command and log the results.

sudo crontab -e

Code: Select all

# m h  dom mon dow   command
*/1 * * * * free >> /var/log/free.log
by DougieLawson
Mon Jun 18, 2018 3:00 pm
Forum: Beginners
Topic: Running a command [solved]
Replies: 3
Views: 94

Re: Running a command

Use the "dot slash commandname" feature of the shell.
./commandname
by DougieLawson
Mon Jun 18, 2018 2:57 pm
Forum: Raspbian
Topic: Help installing a new kernel module.
Replies: 2
Views: 79

Re: Help installing a new kernel module.

Pull the kernel source that matches your Raspbian kernel with the rpi-source helper script from https://github.com/notro/rpi-source. Get the current config with sudo modprobe configs zcat /proc/config.gz > .config Change that .config so that CONFIG_SENSORS_MAX1668=m is set. Make oldconfig, build it,...
by DougieLawson
Mon Jun 18, 2018 2:06 pm
Forum: Troubleshooting
Topic: Socket error [101]: Network not rechable
Replies: 3
Views: 92

Re: Socket error [101]: Network not rechable

What address are you trying to connect to when you get the socket error?

The first two commands of mine tell us what subnet you're connected to and where your gateway router is located.
by DougieLawson
Mon Jun 18, 2018 12:04 pm
Forum: Raspbian
Topic: Upgrade to kernel 4.16 in Strech
Replies: 3
Views: 144

Re: Upgrade to kernel 4.16 in Strech

Why do you want to go beyond the RPF/RP(T)Ltd supported 4.14.49 (latest with rpi-update)?

https://github.com/notro/rpi-source/wiki can help you get the source if you really want to build it yourself.
by DougieLawson
Mon Jun 18, 2018 11:21 am
Forum: Troubleshooting
Topic: keyboard configuration problem?
Replies: 9
Views: 201

Re: keyboard configuration problem?

Octothorp removes any differences due to where you live and how you speak.
{} are braces, [] are brackets and () are parentheses, they are not curly brackets, square brackets and round brackets (or left banana, right banana).
by DougieLawson
Mon Jun 18, 2018 11:17 am
Forum: Troubleshooting
Topic: Reading 4 Analog ultrasonic sensors with MCP 3008
Replies: 5
Views: 95

Re: Reading 4 Analog ultrasonic sensors with MCP 3008

Have you thought about using the supplied function in GPIOZero which makes reading an MCP3008 into child's play? #!/usr/bin/python3 from gpiozero import MCP3008 from time import sleep LL = MCP3008(channel=4, device=0) while True: adcValue = (LL.value * 3.3)*100 print('{:.1f}'.format(adcValue), 10 * ...
by DougieLawson
Mon Jun 18, 2018 10:56 am
Forum: Beginners
Topic: Can't find/edit Config.txt
Replies: 9
Views: 209

Re: Can't find/edit Config.txt

Has this whole forum really become Raspbian only? Nobody stops you from helping OP, not even Dougie. He does give some good advice in this case, though Openelec uses Berryboot or U-boot or something like that (or it did last time I looked at it). It's not as simple as Raspbian or NOOBS. So asking w...

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