Raspberry Pi Forums

david_1234

Hello,
I have a usb mic connected to my pi4
I want to run a code that will start streaming the audio , and when I will open vlc (or ceate a simple html page ) I will hear the sound from the mic

how can I do this?

**i have a pi camera , and I want to be able to hear the sound in the area

Thanks,

david_1234

great
I will give it a try
Thanks!

david_1234

this is half relaeted to the PI I'm using python on PI4 and wanted to know what is the best resolution I can get from my usb camera to work? this is what I have found : A4TECH PK-900H QUICK OVERVIEW Webcam Model PK-900H Color Glossy Black Frame rate 30fps Image sensor 1080p Full HD Sensor interface ...

david_1234

stil not working
this is what I have

Code: Select all

# Enable DRM VC4 V3D driver
dtoverlay=vc4-fkms-v3d
max_framebuffers=2

# Disable compensation for displays with overscan
disable_overscan=1

I have looked from another PI
and added this lines

Code: Select all

hdmi_group=2
hdmi_mode=51

and now it's working

david_1234

Hello , I have downlaod this version: 2022-04-04-raspios-bullseye-armhf.img.xz install it using PI_Imager on 2 new 32GB SD card but none of them work on my PI4 I have connected a hdmi display - nothong is shown how could it be ? ** the PI 4 in new and working with other old SD card with raspbery OS ...

david_1234

My mistake in the drawing,
the LED if parallel to the Diode and coil and not before of them ...

david_1234

maybe I didn't expalin correct the 5V coil is conencted to the PI (5V and Transistor Collector with the Diode ) and : COMM will be connected to the relay Vin_Of_load NC will be connected to the 24V device Vin what is the problem with this configuration ? 20220406_133053.jpg ** all GND are connected

david_1234

what if I will connect the coil COM between Vin_Of_Load (of the 24V realy) and the 24V device?
iit should be the same , no ?

thank you fot the help!

david_1234

just got the 5V coil
but something is missing for me in the circuit
I have 5 pins
NO, NC
Coil+ , Coil -
COM

if I understand corect:
coil+ to 5V
coil- to Transistor E
NC or NO to Control Pin in the 24V relay (need to see what work better for me )
com to SW1 (24V )

is this corect?

david_1234

I have just order the part - but it will take a faw days until I will get it

for now I will try to make it work using 12V version -

I will update \ ask when I get the pars and make the circuit

Thank you for the answer until now

!

david_1234

can you make a ciruit without the led - I don't realy need it let (try) and make things simple as I understand , I'm using the 5V coil as the device that will be working according to the transistor - correct? when I give "1" at the transistor base --> the 5V coil will change state and what...

david_1234

this is the circuit for 100% I have double check , and ask someone else also to build the circuit from 0 (just to be sure) same resualt on all cases. before I connect the 24V device and realy I am checking it with a 5V led - to make sure everything is working, and it does. again the problem is that ...

david_1234

yes this is a working system I can't touch \ change anything I can only connect to it and another thing: maybe the transistor can't work with 24V? beacuse now I have try to work only with the device without the relay created the same circuit like the LED with the diode , insted of the led I put the ...

david_1234

you are 100% correct
if I had control of the all system
but , I can only connect to the what I have - and I can't change it

I'm trying to give a solution to a problem

so this is what I'm doing :

: 24V_relay.JPG (67.74 KiB) Viewed 627 times

david_1234

1. can you make a cicruit without the led? just the relay ? using the scametic I have done ?mayne I miss understand something the relay is : HELLA , 4RD 007.903-001 2. as I mention as start -I'm connectin to an existing devicer\circuit - I can't change anything there I just want ot controk the relay...

david_1234

I guess soemthig is wrong beacuse I have try to connect only the 24V device and it's allways on (without the relay) also took a 5V led , connect it to the transistor Collector (wiht a 470 Ohm ) - and it's allways on I'm going to get another transistor - make the same circuit for the LED - see if it'...

david_1234

I have remove the diode for now , (is this a problem?)

when I remove the wire from 85(which is relay GND) to the transistor collector the realy is shut down (I can hear the "click" )

david_1234

this is what I have done , I have remove the led just to be sure

: 24V_relay.JPG (79.41 KiB) Viewed 410 times

*** this switch is allways close , so the relay is "ON" all the time.

The device is working

david_1234

maybe the problem is the gnd?
beacue if I have 0.5V and 0V when transistor open\close
maybe for the 24V relay it doesn't matter?

when I check voltage between relay(GND) and Emitter I see 5.4V and 5.9 V
maybe the problem is somewhere here?

maybe this Transistor can't work with 24V load?

david_1234

still not working I have made a simple code that send "1" \ "0" once every 5 seconds the led is blinking OK acoording to the code but the realy is allways on (I the swith is close at all time - giving the control 24V , so the relay is "ON") as I understand from you all ...

david_1234

My problem is that the 24V device that connected to the relay get "stuck" some time - and need to restart it and I have not control on the relay status , so I wnat to be able to control the realy power and not the relay work (if this sentence makeany sense :-) ) if the sw is press \ not pr...

david_1234

I need some more help I need to control the relay wihtout control the relay :) what I mean is - the realy is control by another device using 24V , I want to be able to control it from the PI so when the pi send "1" , then the realy will work - I thought maybe to connect the GND of the real...

david_1234

thank you for the answers
the image is just an example for connections , I just wanted to know about the PI connection part -
the relay is 24V and the device are 24V (not AC )

I will use 2N2222 as you suggested

Thank you
if something will wnet wrong I will ask again

david_1234

Hello, I want to connect a relay to pi and control it using python app the device is 24V and the relay is https://www.trodo.com/relay-main-current-hella-4rd-007-903-001 I know it's best to use a small circuit (Diode,Ressitor and Transistor) to control the relay I have found this example https://www....

david_1234

Hello I'm trying to analyze some canbus data , so I want to use the cansniffer my problem is that it doesn't show any data candump is working - and I can read the data but when I turn tyr to run cansniffer - I get empty pi@raspberrypi:~ $ cansniffer can0 -c 07 delta ID data ... < cansniffer can0 # l...

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Re: Electronic help connecting relay to PI4

Re: Electronic help connecting relay to PI4

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Re: Electronic help connecting relay to PI4

Re: Electronic help connecting relay to PI4

Re: Electronic help connecting relay to PI4

Re: Electronic help connecting relay to PI4

Re: Electronic help connecting relay to PI4

Re: Electronic help connecting relay to PI4

Re: Electronic help connecting relay to PI4

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Re: Electronic help connecting relay to PI4

Re: Electronic help connecting relay to PI4

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