Raspberry Pi Forums

pcmanbob

My guess would be that RPI OS is more optimised for use on the pi than Ubuntu server is.

pcmanbob

Hi.

First thing I suggest is you read the not booting sticky

viewtopic.php?f=28&t=58151

pcmanbob

You should always run " sudo apt update " before trying to install software to make sure you have the up to date repository list of files or you will see errors like the one you had.

pcmanbob

So here is an example of how you would do it using an opto isolator https://i.imgur.com/o1eGU5G.jpg Now you do have to know or be able to work out which way the current is flowing in the switch circuit or to put it another way which is the high side of the switch circuit. Doing it with a relay would...

pcmanbob

As you say you had it in a case is there a corresponding burn mark or any burn marks in the case ?

Especially as you appear to be using a metal case.

pcmanbob

Yay! I ran into this problem too! Let's see if replying to this thread will fix it. edit: Yep, fixed it immediately. Hi. All you had to do was to wait for your first post to be reviewed by a moderator and then authorized, this is all that happened with your post on this thread , it just takes time ...

pcmanbob

Hi. From the limited information supplied your error looks to be concerned with accessing the directory name on the pi SD card. What size SD card are you using ? were did you get it ? This is of course assuming you are using an SD card and not some other storage as you have not given that informatio...

pcmanbob

Hi. If the SoC is heating up quickly when powered, with nothing connected to the pi and no SD card installed then it suggested it has suffered internal damage, the damage may have been done at some point earlier in the pi's life but did not stop it working , but as damage normally leads to further f...

pcmanbob

You are going to need to open up the remote and investigate the switches to see how they work and what type they are, so you can get some idea on how you need to interface to them. I doubt you will find a circuit diagram for the controller so you are going to need to do a lot of investigation yourse...

pcmanbob

You can often make these boards work by just adding a simple interface transistor circuit between the pi and the relay board, if it a single or 2 relay board then a simple circuit like this https://i.imgur.com/nHB4Xz9.jpg this will also make your relay board active high, so a high output from the pi...

pcmanbob

If you scan for wifi networks can you actually see the wifi network provided by your server form the pi in question ?

Have you made the SSID hidden on your home server or done any other things that might limit connections like mac filtering ?

pcmanbob

In the past the problem has been to fold.

1. pi was so cheap repairing them did not make financial sense
2. obtaining parts in small quantitys especially the IC's has been a problem

While repairs might make more financial sense now , obtaining parts is probably even more difficult.

pcmanbob

One last thought try unplugging the fan , then try booting the pi may be the fan is bad and drawing more current than it should.

pcmanbob

Well USB and Ethernet ( wired networking ) are on he same chip so if one is not working nor will the other , but wifi is a separate chip, so it sounds like you have done some damage to the pi that's affected both chips, but as rpdom said , if you have done that much damage its surprising the pi stil...

pcmanbob

So if you are only seeing low volt warnings while powering through the element 19 power hat and you are also experiencing booting problems while powering through the hat I would say that the hat is the problem. As its a commercial product I would go back to who ever you purchased it from and raise i...

pcmanbob

On a fully working pi3B you should see this pi@Bullseye-Test-1:~ $ lsusb Bus 001 Device 003: ID 0424:ec00 Microchip Technology, Inc. (formerly SMSC) SMSC9512/9514 Fast Ethernet Adapter Bus 001 Device 002: ID 0424:9514 Microchip Technology, Inc. (formerly SMSC) SMC9514 Hub Bus 001 Device 001: ID 1d6b...

pcmanbob

It is most probably possible using either relays , transistors or opto isolators but as has already be stated we would need to know a lot more about the circuit and its operating voltages before recommendation or even example circuits could be provided. I would recommend either relays or opto isolat...

pcmanbob

Example wpa_supplicant file

Code: Select all

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=GB

network={
	ssid="XXXXXXX"
	psk="XXXXXXXXXXXXXXX"
	key_mgmt=WPA-PSK
}

pcmanbob

I don't have any experience of using the pico , but on the pi I often recommend using the ULN2803A to interface the pi gpio to higher voltages when the gpio is set to output. If you use the exact part no. you can connect the gpio pins set to output directly to the input pins on the chip so providing...

pcmanbob

Even without the country being set I would still expect rfkill to show the wifi being soft blocked.

With all the other failures / damage the pi has I suspect the wifi module has been damaged along with everything else.

pcmanbob

I am using RPI keybord, mouse and power supply . I tried changing the power supply but same problem "lightning bolt symbol". No extra hardware attached. So is this still trying to power the pi via the element 19 power hat or powering it direct ? If its via the power hat then I suggest you...

pcmanbob

Yes those would work,

connect your 12V to J1 making sure you connect it the correct way round, opto isolators are polarity sensitive.

You would connect the pi to J2 , gpio pin to terminal 2 ( out ) and the pi ground to terminal 3 ( GND ).

pcmanbob

No specific reason on the 12v power brick. I just know that most relays run on that, although your suggestions seems like it would work well for my situation. I am not all that familiar with opto isolators or know which one to get for this situation. Just about any common opto isolator would work b...

pcmanbob

That relay may not be suitable for connection to the pi 3.3V gpio, It appears to use low level triggering via a transistor which is probably a PNP type, as the relay requires 5V to operate you could be grounding a 5V circuit on a gpio pin , the gpio pins on the pi are not 5V tolerant so you could da...

pcmanbob

Hi. So is there a reason you chose a 12V power brick ? But what every voltage power brick you use I would recommend you use an opto isolator rather than a relay as relays are more prone to failure over time that an IC. You would wire it like this to your pi. https://i.imgur.com/8fqzKxZ.jpg Then you ...

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