Raspberry Pi Forums

pidd

Try increasing your pulselength to the default 350 and see if that works?

pidd

It very fine line depending on the drive, I have a portable drive and a keyboard dongle connected to my Pi4-4GB, I can add a USB mouse but a USB keyboard knocks it out. Another drive just flattened it without anything else connected. The 8GB draws a bit more power itself so might be less tolerant of...

pidd

You can use another GPIO in as a source voltage but generally I wouldn't, why not keep it simple? Just use the 3.3V supply, preferably with a resistor in series.

pidd

That's my fault, I didn't know RGB strips came in common anode, I have only played with individually addressable strips. I can't see anything you have done wrong, there is a chance the MOSFETS won't switch fully off and you'd normally put a resistor in to help that but you have the opposite problem....

pidd

Forgot to mention, you are using the hdmi socket nearest the power connector on the Pi4?

pidd

I'm a bit confused, you appear to have copied him perfectly.

What I don't understand is that he looks like he has the +12V going to the black lead of the LED strip????

pidd

start off by un-commenting hdmi_safe=1 then reboot and see if that gives you a picture (it probably will).

Re-comment hdmi_safe=1

un-comment hdmi_force_hotplug=1 and reboot, this hopefully will give you a picture at the required resolution.

pidd

How many LEDs are there and what is your 12V power supply rated at in amps?

What is your brightness issue?

pidd

A PSK passphrase is limited to 63 ascii characters.
A PSK is 32 bytes which is often represented by 64 hex characters.

The PSK is usually generated from a passphrase.

pidd

How (what software/hardware/protocol) is your pi using to transferring to server?

pidd

Its not just you.

I don't get sound either, Chromium has sound, sonic-pi doesn't. Using Pi4 3.5mm jack.

Not got round to looking into it yet.

pidd

IR beam is probably the easiest, back in the day we used pressure mats but had to replace them pretty often.. The count will never be accurate, even with turnstiles people with kids upset the count. With beams and mats you get multiple triggers per person sometimes. Two sensors on the run, say 20cm ...

pidd

According to that your 777vr1 doesn't have a gigabit ethernet port.

pidd

GPS won't tell you your direction until you move and you then calculate the direction travelled between two points. SATNAVs generally remember the direction you were last travelling in and initially use that until you move. You can use a magnetometer (electro magnetic compass) to give you the direct...

pidd

Thus if anyone has an accepted amperage range for the opto-isolator, I can determine an acceptable resistor for this range. I included the specs of the optoisolator I bought for reference: ... The spec as quoted suggests a design diode current of 5mA, a maximum I f of 50mA, and a typical V f of 1V2...

pidd

Did you reboot or restart dhcpd after adding the new wifi settings?

I've got to admit, on my Pi4s I never found reconnections on WifI robust and ended up going ethernet but my PiZeroW has always been ok.

The instructions were there before RPIOS came out so should be good for Buster.

pidd

Sorry to not give details but if you look at https://www.raspberrypi.org/documentati ... ess-cli.md Adding multiple wireless network configurations. (which is at the very bottom of the page)

pidd

Unfortunately the specs don't give you the maximum LED current nor the LED voltage drop.

pidd

Since I already log data to a Google sheet it looks like I might be able to write a Google Script to send me an email. Just thinking out loud here I can have the Pi send a timestamp periodically to a Google sheet and through some calculations determine if there is a specific time delay since last t...

pidd

You have your optocouplers the wrong way round , the diode (LED) goes to the switches, the transistor end goes to the Pi.

pidd

Booting into command line mode, running startx, playing around in LXDE then shutting LXDE back down to command line - sometimes gvfs closes down, sometimes it doesn't. I've not been able tie it in with any particular actions in LXDE. I've disabled the two Chromium "carry on after closing" things, ma...

pidd

There was an update about a week ago that stops the Pi4 from bombing out while playing a video. Mine have been perfect since.

pidd

If you'd asked me a year ago I'd have agree with using IFTTT but since then they have clamped down on some of their free services without warning which was really annoying. I'm waiting for them starting to charge for some services. I haven't seen anything in IFTTT that could be used for an absence o...

pidd

From BoyOh Yes Opto Isolators are a must, as i suggested in my circuit designee But using 50ohm resistors as Pull Down resisters , is a total impedance miss match, it will divert the low power signal out of existence Regards BoyOh My thinking is 1000ft aerial and a diode (LED) in an optoisolater is...

pidd

jojopi wrote: ↑
Tue Jun 09, 2020 11:11 am

carzhero2014 wrote: ↑
Tue Jun 09, 2020 9:39 am
while cd.. returns focus to the parent directory.
Also wrong.

man command will show the manual for command, so you do not have to ask the internet every time.

Not sure which way you meant it but neither "man command" nor "man cd" works for me?

"cd.." needed a space "cd .."

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