Raspberry Pi Forums

sparkyhall

Assuming the fans you have can be controlled by PWM the diode seems unnecessary and as drawn is round the wrong way. The circuit you have drawn will do nothing.

sparkyhall

The LCD in the pictures includes a parallel to I2C converter board, the board with the potentiometer. You cannot connect this variant of the LCD to the Pi the way you have as the LCD is intended to be connected using the 4 pins on the converter board. I believe that this LCD is designed to be powere...

sparkyhall

If the Pi works OK with nothing connected to the GPIO then this suggests that the Pi is fine and the problem is with the items you are connecting to the GPIO. A picture of your connections and a link to the LCD and potentiometer would be helpful here otherwise we are just guessing. If you are using ...

sparkyhall

I'm not sure how to roll back to previous a kernel as I tend to keep back-ups. Assuming you are using Raspberry Pi OS (formally Raspbian) to stop a package from updating you use "sudo apt-mark hold <package-name>". So to stop the boot loader and kernel updating you would use: sudo apt-mark...

sparkyhall

I think you have this the wrong way round. From rooco web site it looks like the drivers for the Moitessier hat are tied to a specific kernel version so it's no wonder it breaks when the kernel is updated. You need to contact rooco and ask them to update their drivers or you can have a go compiling ...

sparkyhall

If for example I have some partition, I'm backing up all the files in there, deleting it and then recreating that same partition and pasting the original files, after modifying the cmdline/fstab accordingly, should it work? Thanks. Yes, providing you maintain the correct file attributes such as own...

sparkyhall

I'd forget about plugging a floppy drive in, that's not going to be at all easy.

You also need a wired network connection as wifi is not plug and play on Riscos unlike on more modern systems.

sparkyhall

Did you remember to tell ncdu to start at the root directory?

Code: Select all

ncdu -x /

The -x is not necessary but it stops ncdu crossing file system boundaries, for example, if you have a USB drive plugged in.

sparkyhall

The default keyboard layout is for the UK so I guess you failed to set the keyboard layout when you first booted. On a UK keyboard the # key is next to the enter key, see here: https://en.wikipedia.org/wiki/British_and_American_keyboards Once you are in you can set the keyboard layout through the co...

sparkyhall

You can install command line file managers such as midnight commander (mc).

sparkyhall

You seem to have omitted the flywheel/flyback diode across the relay coil, without this you are allowing the back emf to rise to an uncontrolled level which is why you see the high voltage transient during switch off. You can probably get away with this with small relays like the one you have used b...

sparkyhall

Have you checked that the ssh demon is running on the pi? To do this open a terminal on the pi and enter the following at the command prompt: ps aux | grep ssh and you should see something like this: root 544 0.0 0.1 10724 5376 ? Ss 16:33 0:00 /usr/sbin/sshd -D chris 951 0.0 0.0 4520 288 ? Ss 16:33 ...

sparkyhall

Although not specifically for Raspian or the Pi this guide looks like it should work:

https://gist.github.com/raelgc/6031274

Note: I've not tried this myself yet but I plan to in the very near future.

sparkyhall

The default boot loader config was changed some time ago so that the 3V3 now remains on after a system halt because some hats did not like having a 5V supply without 3V3. You can change back to the previous behaviour by changing the defaults for "WAKE_ON_GPIO" and "POWER_OFF_ON_HALT&q...

sparkyhall

Are there extra procedures to prevent the pi from shorting You can use a Fuse or a Polyfuse for protection if you feed Power into GPIO. This need a Step-Down or a Step-Up Converter cause the floating voltage of batterys. You can for example use 6x 1.2V and feed this into XL4015 then into the Raspbe...

sparkyhall

The default boot loader config was changed some time ago so that the 3V3 now remains on after a system halt because some hats did not like having a 5V supply without 3V3. See "WAKE_ON_GPIO" and "POWER_OFF_ON_HALT" in the following link: https://www.raspberrypi.org/documentation/h...

sparkyhall

3V3 pin to HDMI_metal shell = 3.3V is Correct 3v3 pin to Gnd = -1.79 suggests that your gnd is connected to 5V 5v0 pin to HDMI_metal shell = 0v suggests that your gnd is connected to 5V 5v0 pin to Gnd = 5v is correct and contradicts the readings above? It think it is time to check the continuity bet...

sparkyhall

Yes, a metal case can have a negative impact on the WiFi signal. Given the number of variables (distance from router/AP, number of nearby routers in your area etc) it's not possible to say if this will be a problem for you. To give you an idea here is a link to a review of the Argon Neo with WiFi re...

sparkyhall

With the sensor unplugged, the voltage measurement is 3.36v. When wired as shown below the voltage is 0.57v It's not going to work if the 3V3 measures 0.57V at the BME280, this is the area we need to focus on. What supplies the 3V3, is the Raspberry Pi or something else? What happens to the Raspber...

sparkyhall

It'll be fine, just keep connecting cables as short as possible, I would go for < 150mm.

sparkyhall

If you have configured the GPIO for internal pull-down then there is no need for the external pull-down resistors. The only thing you need to consider is is the internal 50k(ish) pull-down is enough for your use case.

sparkyhall

I just had a hard lock on mine after just over 2 hours of use., never done this before and I have been using this a few hours a day since July. This was with CPU overclock = 1800MHz and overvolt=2.

Will drop to default clock and overvolt and see how it goes.

sparkyhall

DVFS firmware working fine here. I normally run with a CPU overclock of 1800MHz and overvolt=2, this works fine with DVFS although I get 5 frequency steps (600, 720, 900, 1200 & 1800) I assume this is correct? The idle power consumption at the mains plug is now 3.0W instead of 3.3W, that's a 10%...

sparkyhall

As others have suggested, detecting lightning may be the way to go. You can buy ready made break out boards for this, such as this one: http://www.embeddedadventures.com/as3935_lightning_sensor_module_mod-1016.html I have had one these for about a year and I plan to attach this to my Pi based weathe...

sparkyhall

Board orientation makes a difference, vertical seems best for cooling and I recall jahboater saying his was vertically mounted.

Search found 168 matches

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