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by drgeoff
Thu Mar 21, 2019 1:19 pm
Forum: Beginners
Topic: Sinusoidallly Modulated Signal Output
Replies: 4
Views: 88

Re: Sinusoidallly Modulated Signal Output

RPis other then the Zero range have an analogue audio output from the 3.5 mm socket. You will need an amplifier between that and your speaker.
by drgeoff
Tue Mar 19, 2019 7:03 pm
Forum: Beginners
Topic: Can I use pi zero fpc connection for smth other than camera?
Replies: 2
Views: 75

Re: Can I use pi zero fpc connection for smth other than camera?

No.

The camera connector can only be used with RPi branded and compatible cameras. The signals on it have little in common with those on the GPIO header.
by drgeoff
Tue Mar 19, 2019 7:01 pm
Forum: General discussion
Topic: Pi Zero camera case, for use in a car
Replies: 6
Views: 154

Re: Pi Zero camera case, for use in a car

pi4b wrote:
Tue Mar 19, 2019 6:20 pm
I expect it would be wiser to use a power bank e.g. from Anker that is being charged via that outlet & USB cable while it is being discharged by the Pi Zero W + camera.
For future reference, be advised that very few powerbanks are capable of being charged and supplying power simultaneously.
by drgeoff
Tue Mar 19, 2019 10:58 am
Forum: Troubleshooting
Topic: Replace Broken Component (capacitor, transistor, resistor?)
Replies: 10
Views: 225

Re: Replace Broken Component (capacitor, transistor, resistor?)

HawaiianPi wrote:
Mon Mar 18, 2019 9:49 pm
Depending on the soldering skill of your helper, you could substitute the more commonly available epoxy dipped version.

Which looks similar to this:
C047U10T.jpg
Note that this type (tantalum) is polarity sensitive and must be connected the correct way round.
by drgeoff
Sun Mar 17, 2019 4:47 pm
Forum: Advanced users
Topic: Connecting Mobile Phone to 3 BT Speakers, for multi-room play
Replies: 1
Views: 52

Re: Connecting Mobile Phone to 3 BT Speakers, for multi-room play

TigerSamm wrote:
Sun Mar 17, 2019 4:16 pm
I don't mind connecting the Mobile Phone to the Raspberry Pi via AUX cord if that makes anything easier.
RPI Bluetooth can only connect to 1 BT speaker at a time.

No RPI has audio input suitable for connecting via an AUX cord.
by drgeoff
Sun Mar 17, 2019 4:40 pm
Forum: Troubleshooting
Topic: SSH Login Outside LAN: Port 22 Won't Open
Replies: 26
Views: 341

Re: SSH Login Outside LAN: Port 22 Won't Open

Look like the OP is confused about port forwarding. His test result "ssh: connect to host 36.73.72.157 port 23456: Connection timed out" indicates he wants to use port 23456 over the WAN but his router page shows port 22 (the external) from the WAN being forwarded to 23456 of his RPi on the LAN. As ...
by drgeoff
Sun Mar 17, 2019 4:30 pm
Forum: Beginners
Topic: Input Relays
Replies: 21
Views: 389

Re: Input Relays

boyoh wrote:
Sun Mar 17, 2019 4:01 pm
Using a 5v+ power adapter , you will be using full wave rectified
Smooth filtered 5vdc, all component parameters worked out for you
BoyOh
Unnecessarily expensive and possibly bulky given that the OP wants 4.
by drgeoff
Sat Mar 16, 2019 6:08 pm
Forum: Beginners
Topic: Input Relays
Replies: 21
Views: 389

Re: Input Relays

drgeoff: Can you point me towards some 110v optocouplers then? My google-fu is failing me and I'm not finding any rated for that input. I did find this one but it's rated for 220v and in don't know that it will work on 110v No, I have not suggested 110 volt optocouplers. You don't appear to underst...
by drgeoff
Sat Mar 16, 2019 5:42 pm
Forum: Beginners
Topic: Input Relays
Replies: 21
Views: 389

Re: Input Relays

drgeoff: Generally optocouplers are low voltage and DC. I need 110vac on one end and 3.3/5vdc on the other. Also relays are by nature isolators for stepping up/down voltage or changing types of power (ac/dc) All I'm really looking for is some recommendations on RELAYS, please? 110vac coil designed ...
by drgeoff
Sat Mar 16, 2019 5:06 pm
Forum: Beginners
Topic: Input Relays
Replies: 21
Views: 389

Re: Input Relays

I suggest optocouplers. For each, use a capacitor as the major part of the voltage dropper.
by drgeoff
Sat Mar 16, 2019 10:03 am
Forum: Troubleshooting
Topic: Backup Restore Rpi dmg via terminal on mac
Replies: 14
Views: 235

Re: Backup Restore Rpi dmg via terminal on mac

It did not boot. So I proceeded to make another copy and when I inserted the original hassio microsd I noticed that the Mac simply doesn't recognize whatever format hassio does to the microsd because I got the same popup dating it didn't recognize it. I went ahead and made a cdr of it and saved it ...
by drgeoff
Fri Mar 15, 2019 9:25 pm
Forum: Troubleshooting
Topic: RPi1 with bad contact on the SD card port
Replies: 4
Views: 120

Re: RPi1 with bad contact on the SD card port

Hello, I have one RPi1 which as a bad contact on the SD card port . That is, If I press the SD card down the RPi1 boots normally. If I don't press the SD card down the RPi won't boot. So, before starting re-soldering the SD card port pins, bending contacts... I want to know if this is a know issue ...
by drgeoff
Fri Mar 15, 2019 9:20 pm
Forum: Beginners
Topic: Can I setup display by making changes in /boot ? If yes, then How ?
Replies: 8
Views: 249

Re: Can I setup display by making changes in /boot ? If yes, then How ?

I suppose OP didnt state if it was a GPIO connection or not (unless I missed something?) I took it as he has access to the desktop, but is asking how to change things once he gets to the 'cyber cafe' and only has a portable 3.5" display.. The OP intends to take his SD card and a card reader to the ...
by drgeoff
Fri Mar 15, 2019 9:59 am
Forum: Troubleshooting
Topic: Corrupted MicroSD
Replies: 5
Views: 190

Re: Corrupted MicroSD

Use the SD Card Association formatter to restore a card to a single partition occupying the entire card.
by drgeoff
Fri Mar 15, 2019 1:22 am
Forum: General discussion
Topic: Can Pi be powered by stepped sine wave power generated by a UPS?
Replies: 26
Views: 874

Re: Can Pi be powered by stepped sine wave power generated by a UPS?

JohnsUPS wrote:
Thu Mar 14, 2019 9:57 pm
That is the same as saying your house outlets are 169 volts. They are, in peak-peak terms
169 volts is not the peak-to-peak of 120 volts RMS.

You still have not addressed my question about your "Cos .707 = 0.999".
by drgeoff
Fri Mar 15, 2019 1:13 am
Forum: Beginners
Topic: Why my IR LED transmitter not transmit any signal?
Replies: 43
Views: 779

Re: Why my IR LED transmitter not transmit any signal?

So, I have been trying to transmit a signal from my IR LED transmitter. I record the signal by using an LED Receiver. But, when I tried to send the signal, the result is nothing. I use my mobile phone camera to see the IR LED light and no light is emitted. I tried to place a normal LED and try to t...
by drgeoff
Fri Mar 15, 2019 1:07 am
Forum: General discussion
Topic: first time copying SD card issues
Replies: 4
Views: 226

Re: first time copying SD card issues

thanks for the usb copying tip, I did get my image down to just 4 GB using the early version of win32 disk imager and writing it in the new version, anway i am still gettiing the same problem with this message at the end of th e boot process: end kernel panic - not syncing - VFS: Unable to mount ro...
by drgeoff
Thu Mar 14, 2019 3:06 pm
Forum: Troubleshooting
Topic: Backup Restore Rpi dmg via terminal on mac
Replies: 14
Views: 235

Re: Backup Restore Rpi dmg via terminal on mac

marciokoko wrote:
Thu Mar 14, 2019 12:04 pm
This morning when I woke up, about 12 hours later, I saw this:

rpirestore.jpg
Does it boot?

12+ hours is abnormally long for writing 32 Gbyte.

If it does boot, perhaps see if adding bs=4M to the dd command gives an appreciable speed increase in future.
by drgeoff
Thu Mar 14, 2019 3:02 pm
Forum: Troubleshooting
Topic: Backup Restore Rpi dmg via terminal on mac
Replies: 14
Views: 235

Re: Backup Restore Rpi dmg via terminal on mac

This morning when I woke up, about 12 hours later, I saw this: rpirestore.jpg I was under the impression that a Raspberry Pi Operating System is a .IMG file ? A RPi OS image can have any arbitrary file name including arbitrary extension, even no extension. hassioon2.dmg is merely the name that the ...
by drgeoff
Tue Mar 12, 2019 11:14 pm
Forum: Troubleshooting
Topic: Disable Video signal from Composite output
Replies: 2
Views: 73

Re: Disable Video signal from Composite output

I have been looking around and I can not believe that it is this hard to fully turn off the video output of the Composite or 3.5 mm jack. I have a project that I am working on that even using a trrs adapter plug to break that connection still does not fix the audio hum issue on the audio equipment....
by drgeoff
Tue Mar 12, 2019 5:54 pm
Forum: Compute Module
Topic: Is my compute module dead? (Doesn't show up on Waveshare board)
Replies: 7
Views: 175

Re: Is my compute module dead? (Doesn't show up on Waveshare board)

Have you loaded an OS on the Compute Module?
by drgeoff
Tue Mar 12, 2019 5:45 pm
Forum: Graphics, sound and multimedia
Topic: Pi-to-Pi Low Latency One-To-Many Video Streaming
Replies: 11
Views: 1484

Re: Pi-to-Pi Low Latency One-To-Many Video Streaming

The lowest latency and simplest system is analogue CCTV. The downside is the coax cables to the displays.
by drgeoff
Tue Mar 12, 2019 5:37 pm
Forum: Troubleshooting
Topic: "lightning bolt" low power always on
Replies: 6
Views: 133

Re: "lightning bolt" low power always on

Where are you measuring that 5.04 volts?
by drgeoff
Tue Mar 12, 2019 5:34 pm
Forum: General discussion
Topic: USB Gadget mode; am I connected?
Replies: 12
Views: 317

Re: USB Gadget mode; am I connected?

This seems like one of the most basic questions, but then what do I know? I've set up a Pi Zero W as a USB Gadget. It's powered from the "PWR" connector. I want to know when it's been plugged into a system on the "USB" connector. There must be a flag someplace I can poll, or an event that fires, or...
by drgeoff
Tue Mar 12, 2019 5:14 pm
Forum: Automation, sensing and robotics
Topic: Sound Sensor to catch a specific noise a saw motor gives off?
Replies: 7
Views: 276

Re: Sound Sensor to catch a specific noise a saw motor gives off?

You are rather unlikely to find such a sensor.

You might have more luck by using a fairly ordinary microphone (perhaps directional) and sound analysis software "tuned" to the particular noise you want to identify.

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