Go to advanced search

by Burngate
Mon Oct 16, 2017 9:06 am
Forum: Other projects
Topic: Nicd Battery charging Help.
Replies: 4
Views: 117

Re: Nicd Battery charging Help.

Yuasa batteries and car batteries are lead-acid. They're very tolerant of mistreatment - a car alternator just puts 14v or so across it and lets it take whatever current it wants. The automotive industry wouldn't have survived more than a century if the battery was more prone to failure. Once fully ...
by Burngate
Sun Oct 15, 2017 9:45 am
Forum: Other projects
Topic: Nicd Battery charging Help.
Replies: 4
Views: 117

Re: Nicd Battery charging Help.

1, You haven't supplied enough information about the solar panel or the "solar charger controller", so all I can do is guess. I'm guessing it's designed to have a 14.4v NiCd battery attached, and can successfully charge it. But there are lots of different battery technologies, each requiring differe...
by Burngate
Tue Oct 10, 2017 4:55 pm
Forum: Troubleshooting
Topic: Re-start with three cores corrupts SD-card?
Replies: 11
Views: 523

Re: Re-start with three cores corrupts SD-card?

People have reported not getting corruption even without properly shutting down, so not getting corruption several times in a row isn't evidence of no problem. Knowing nothing about the shut-down sequence, so waving hands around frantically in an effort to convince at least someone that I'm not a ch...
by Burngate
Tue Oct 10, 2017 4:37 pm
Forum: Troubleshooting
Topic: HDMI earth /spike causing sd card corruption??
Replies: 2
Views: 112

Re: HDMI earth /spike causing sd card corruption??

... As they are running on the hospital ups there should not be spikes... The ups might isolate the hospital from outside problems, but I would expect things such as MRI scanners to put noise on the internal system. As wally333 says, the Pi is normally floating, and most modern TVs also. Connecting...
by Burngate
Tue Oct 10, 2017 3:53 pm
Forum: Troubleshooting
Topic: Re-start with three cores corrupts SD-card?
Replies: 11
Views: 523

Re: Re-start with three cores corrupts SD-card?

Gert van Loo wrote:
Tue Oct 10, 2017 9:22 am
maxcpus=3.
Does it only happen with 3, or does 2 or 1 do the same?
Does full shutdown followed by restart using the "run" pins also corrupt the card?
by Burngate
Tue Oct 10, 2017 10:47 am
Forum: Beginners
Topic: infared and noir camera.
Replies: 2
Views: 167

Re: infared and noir camera.

... But I read it somewhere seems to suggest that noir is a low light camera, not a true infared camera. Is this true? No, it's not. Whoever wrote that is misinformed. I always thought that noir camera is nothing more than a regular camera such as the pi camera without the ir filter, thus infared c...
by Burngate
Tue Oct 10, 2017 10:18 am
Forum: Beginners
Topic: Powering Pi from PC PSU?
Replies: 4
Views: 193

Re: Powering Pi from PC PSU?

https://www.newegg.com/global/au/Product/Product.aspx?Item=N82E16817170016&cm_re=psu-_-17-170-016-_-Product Just as a matter of interest, I vaguely remember something about those needing a load on one or more of the rails for them to switch on. Hopefully I'm wrong, or it's the 5v rail that requires...
by Burngate
Mon Oct 09, 2017 10:28 am
Forum: Beginners
Topic: Powering Pi from PC PSU?
Replies: 4
Views: 193

Re: Powering Pi from PC PSU?

5v, 25W so 5A. Yes, you can run one or two Pis, maybe more from one rail. A 5A fuse would protect the PSU from accidents such as shorting the output. A separate fuse for each Pi would protect the cable feeding the Pi (otherwise you should use cable that could carry the full 5A to each Pi, even thoug...
by Burngate
Sat Oct 07, 2017 5:03 pm
Forum: Troubleshooting
Topic: Raspberry pi 3 can not read sd card when boot, location set sd card generates sound
Replies: 4
Views: 170

Re: Raspberry pi 3 can not read sd card when boot, location set sd card generates sound

Michael Hold wrote:
Sat Oct 07, 2017 9:48 am
location set SD card
What is that?
generates sound
Apart from a couple of clicks, I heard nothing.
by Burngate
Fri Oct 06, 2017 10:25 am
Forum: Beginners
Topic: Question / help with a project idea.
Replies: 3
Views: 173

Re: Question / help with a project idea.

I wonder if it's possible to take a string of Neopixels https://www.adafruit.com/product/1138, and separate them?
by Burngate
Fri Oct 06, 2017 10:12 am
Forum: Advanced users
Topic: 3 GHz sine wave using raspberry pi
Replies: 7
Views: 638

Re: 3 GHz sine wave using raspberry pi

mahmod rafat wrote:
Thu Oct 05, 2017 2:56 pm
... sine wave signal with frequency 3 GHz ...
How accurate do you need the frequency to be? ±1MHz? ±10Hz?
How pure do you need the sine wave to be? Can you live with its harmonics at -10dB, or do you need better?
Where are you going to send the signal? How much power do you need?
by Burngate
Fri Oct 06, 2017 10:06 am
Forum: General discussion
Topic: gpio header diagram maker
Replies: 22
Views: 912

Re: gpio header diagram maker

Nice. Well worth the £10 (he or she will now have learnt something about the value of time, so your next project will cost you £100) A couple of comments / questions. It's hosted on your Synology device, not my own, so if that dies, my project is lost? Can I keep a back-up on my own system? All the ...
by Burngate
Fri Oct 06, 2017 8:54 am
Forum: General discussion
Topic: unreadable font at https://www.raspberrypi.org/products/ [solved]
Replies: 13
Views: 715

Re: unreadable font at https://www.raspberrypi.org/products/

... but on 5th - yesterday - on the sticky thread https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=187256#p1218978 he said Not hugely exciting, but we had a few pages on the website (products etc) that had a very difficult to read font. This should now be fixed. Not that I can see any problem...
by Burngate
Thu Oct 05, 2017 5:16 pm
Forum: Off topic discussion
Topic: is software harder than hardware? :)
Replies: 38
Views: 1822

Re: is software harder than hardware? :)

Seems to me there are levels of hardware design, and probably also software. Putting a few dozen components on a circuit board isn't the same skill as putting a few arm cores and a gpu onto silicon. But, being more hardware orientated, it seems to me it's easier to just try something and see in soft...
by Burngate
Thu Oct 05, 2017 9:51 am
Forum: General discussion
Topic: Why no enthusiast Raspberry Pi products?
Replies: 53
Views: 2830

Re: Why no enthusiast Raspberry Pi products?

Thanks to those who actually showed up to help, and/or have a conversation. In the future, I'll likely take my thoughts somewhere a little less hostile. I think you might have accidentally hit a tender spot - a bit like asking a Glaswegian why Rangers aren't doing very well. In one pub, you'll get ...
by Burngate
Thu Oct 05, 2017 9:20 am
Forum: Beginners
Topic: Current draw from GPIO pins
Replies: 28
Views: 1001

Re: Current draw from GPIO pins

But it's still up to the user, and the GPIO is still general purpose. The important bit is "input output" That implies signals, data, etc. Not power. If they were intended to supply power, they should be called GPP -- "General Purpose Power". A family car might be described as "General Purpose" in ...
by Burngate
Wed Oct 04, 2017 5:42 pm
Forum: Beginners
Topic: Current draw from GPIO pins
Replies: 28
Views: 1001

Re: Current draw from GPIO pins

GPIO =General Purpose Input Output. That implies a particular use. I would disagree. General purpose means, to me, no particular use at all, do what you want. Powering sensors is not normally part of the role of input/output. Of course, you can draw 16mA from one or more pins, up to the recommended...
by Burngate
Wed Oct 04, 2017 5:26 pm
Forum: Automation, sensing and robotics
Topic: remote monitoring of 12v battery
Replies: 16
Views: 996

Re: remote monitoring of 12v battery

my voltage will typically be around 13.2 but may be a little higher (13.9-14) but will definitely drop to a little below 12 when motors turn on (pulling 30+amps) but should maintain around 12.5 (at battery) while they are running. The other part I'm confused about is which voltage do I use for Vin ...
by Burngate
Wed Oct 04, 2017 11:02 am
Forum: Beginners
Topic: Extra warm water with raspberry pi
Replies: 3
Views: 190

Re: Extra warm water with raspberry pi

I would suggest using a relay to perform the operation. That has the advantage of keeping the Pi isolated from possibly dangerous voltages in the heating system. You can't use the GPIOs in the manner you describe. They each can be programmed to provide either 0v or 3v3 with respect to the Pi's groun...
by Burngate
Tue Oct 03, 2017 5:24 pm
Forum: Troubleshooting
Topic: No PWR led, ACT led very dim and gets hot! (A+)
Replies: 35
Views: 1017

Re: No PWR led, ACT led very dim and gets hot! (A+)

I2C.png
I2C.png (9.87 KiB) Viewed 268 times
by Burngate
Tue Oct 03, 2017 10:35 am
Forum: Troubleshooting
Topic: No PWR led, ACT led very dim and gets hot! (A+)
Replies: 35
Views: 1017

Re: No PWR led, ACT led very dim and gets hot! (A+)

Can someone give me advice on the setup? I see some strange things. especially GPIO 3 and 2 read 4.5v! Those are connected to the ADS1115 (it's an ADC) with 5v. I suppose i should change that to 3.3v, didn't know it would also supply around 5v to the i2C pins... But... That can't be the real proble...
by Burngate
Mon Oct 02, 2017 5:40 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Wiring up a switch with a hardwired pull down resistor WITHOUT using a Breadboard
Replies: 4
Views: 399

Re: Wiring up a switch with a hardwired pull down resistor WITHOUT using a Breadboard

Can you tell me if the following will work correctly: 3.3V Pin --> 10K Resistor --> Switch (one end of NO) --> GPIO GND PIN and then setting the ground pin as both ground and input pin? will this work? I don't think you're quite understanding the functions of the GPIO pins. On the Pi's header there...
by Burngate
Mon Oct 02, 2017 5:07 pm
Forum: Automation, sensing and robotics
Topic: MCP3008, Voltage Divider and Pressure Transmitter
Replies: 8
Views: 519

Re: MCP3008, Voltage Divider and Pressure Transmitter

okay, I'm getting there. 5v from Pi to MCP3003 VDD & Vref, and to the level converter high-side. 3v3 from Pi to level converter low-side. Ground from Pi to MCP3008 Dgnd and to Agnd (I think I'd missed that before!) 12v from external supply to sensor. Ground from external supply to sensor and to Pi g...
by Burngate
Mon Oct 02, 2017 4:38 pm
Forum: Automation, sensing and robotics
Topic: connecting multiple magnetic switches
Replies: 10
Views: 446

Re: connecting multiple magnetic switches

There are two parts to your problem hardware and software. Hardware: For each switch, choose a GPIO. Connect each switch between its GPIO pin and a ground pin. If necessary, also connect a resistor of about 1k between each GPIO pin and a 3v3 pin. Software: Just repeat what you did for the single swi...
by Burngate
Mon Oct 02, 2017 4:30 pm
Forum: Other projects
Topic: Meditation Gong
Replies: 10
Views: 631

Re: Meditation Gong

... It still gets me on my feet to greet the postman when he rings twice. Your postman must be cleverer than mine - he can't seem to work out that pushing a button is more efficient than beating hell out of the knocker. Come to think about it, no-one has used the bell in the 30 years I've been livi...

Go to advanced search