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by RattusRattus
Mon Jun 24, 2019 9:23 pm
Forum: General discussion
Topic: Raspberry Pi For 24X7X365 use
Replies: 1
Views: 113

Re: Raspberry Pi For 24X7X365 use

Can an RPi be used 24x7x365 - YES Anything I should consider? * Power budget ** Know what your power consumption is across a 24 hour period, scale your battery capacity accordingly ** Don't forget batteries will age so scale accordingly (i.e. they drop storage capacity as they get older - for LiPol ...
by RattusRattus
Mon Jun 24, 2019 6:53 pm
Forum: Advanced users
Topic: Does the Raspberry Pi 4 officially support micro-SD cards with more than 32GB?
Replies: 3
Views: 339

Re: Does the Raspberry Pi 4 officially support micro-SD cards with more than 32GB?

I will add that ONLY the boot partition needs to be fat32 (or fat16).

Additional partitions on the same uSD card can be of other types, and additional partitions other than the rootfs and boot partition can be any type providing you have drivers for it installed :-)


/RattusRattus
by RattusRattus
Mon Jun 24, 2019 6:43 pm
Forum: Beginners
Topic: RPI4 USB C Power Delivery negotiation
Replies: 12
Views: 496

Re: RPI4 USB C Power Delivery negotiation

Hi there Looking at the reduced schematics provided publicly for the RPi4 [1] we can see that there USB-C power pin (J1.VBUS) is directly connected to the primary 5V power rail. This means that the Pi4 can ONLY accept 5V input from your power supply. There will be NO higher voltage negociation. USB-...
by RattusRattus
Mon Jun 17, 2019 7:44 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: WiringPi and I2C BME280
Replies: 5
Views: 282

Re: WiringPi and I2C BME280

So I think you are saying A) when you have the BME280 connected everything works as you would expect B) When the BME280 is connected it shows up on as device 76 when you scan the I2C bus with ic2detect -y 1 C) When you disconnect the BME280 it correctly disapears from ic2detect -y 1 So far everythin...
by RattusRattus
Mon Jun 17, 2019 12:30 pm
Forum: General discussion
Topic: Generate multiple PWM signals
Replies: 5
Views: 202

Re: Generate multiple PWM signals

Hi there

It sounds like you probably want a GPIO / PWM expander. These mostly use SPI for communications back to your host.

Take a look at modules here:

https://www.adafruit.com/category/866

have a play with different modules and decide on the chip that works best for you.

/Rattus
by RattusRattus
Mon Jun 17, 2019 12:22 pm
Forum: Networking and servers
Topic: Bidirectional Communication
Replies: 3
Views: 295

Re: Bidirectional Communication

That's what networks are for....

You have both Wired and WifI to choose from

:-)

/Rattus
by RattusRattus
Sun Jun 16, 2019 10:15 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: SPI Serial FLASH --> File system
Replies: 0
Views: 180

SPI Serial FLASH --> File system

Hi there, I have an ISSI IS25LP128F SPI 128Mbit FLASH chip attached to SPI bus 0 on nCS0 (GPIO8 pin 24 nCS_FLASH) This shows up as /dev/spidev0.0 on the Pi I would like to put a file system on this device allowing me to leave the SD card mounted RO (except for the all important security updates). I ...
by RattusRattus
Sun Jun 16, 2019 9:51 pm
Forum: Automation, sensing and robotics
Topic: DS18B20 resolution
Replies: 14
Views: 659

Re: DS18B20 resolution

They go off line randomly and need to be powered down before they will work again. Sounds very much like the Fake parts I came across, see my earlier post in this thread. I have only had this problem buying parts from not traceable supply chains. once I started buying parts from the likes of Digike...
by RattusRattus
Sat Jun 01, 2019 5:14 pm
Forum: Beginners
Topic: WiFi - Hot Spot Access
Replies: 6
Views: 213

Re: WiFi - Hot Spot Access

*IF* I have understood you correctly you are asking: Can I use a Pi as a a WiFi ACCESS POINT (Hot Spot) even if the Pi itself can not see or access the internet. YES Obviously when accessing this 'HotSpot' from a laptop, mobile phone etc. the only thing you will be able to communicate with will be t...
by RattusRattus
Sat Jun 01, 2019 5:09 pm
Forum: Beginners
Topic: Bluetooth connected to headphones but no sound. Raspberry Pi 3+
Replies: 4
Views: 236

Re: Bluetooth connected to headphones but no sound. Raspberry Pi 3+

almost certainly you are missing one of the following packages... pulseaudio pulseaudio-module-bluetooth pavucontrol bluez-firmware pulseaudio-module-bluetooth, will add the required pulse audio sink for the bluetooth audio path Then make sure in the bluetooth manager your headset is connecting to t...
by RattusRattus
Sat Jun 01, 2019 5:01 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: No ethernet or wireless interfaces
Replies: 5
Views: 242

Re: No ethernet or wireless interfaces

You almost certainly need firmware (& drivers) specificity for those network cards.
I don't of the top of my head know which modules you will need to load - sorry

/Rattus
by RattusRattus
Sat Jun 01, 2019 4:59 pm
Forum: Camera board
Topic: Image Transfer from rpi to pc
Replies: 2
Views: 121

Re: Image Transfer from rpi to pc

Well if you are controlling WHEN each picture is taken then you know when a file is available (because your take picture function has returned - look at the return code :roll: ) If you are running separate programs to take your pictures and transfer them you could always poll the directory into-whic...
by RattusRattus
Sat Jun 01, 2019 4:52 pm
Forum: Automation, sensing and robotics
Topic: DS18B20 resolution
Replies: 14
Views: 659

Re: DS18B20 resolution

Hi there I use these sensors in quantity. I use them in LARGE chains ( >50 sensors per bus) as a result I DO NOT use the libraries because a single GPIO line is unable to drive a large bus (instead I use multiple GPIO lines to drive pull-up, pull down, strong pull-up and strong pull-down FETs and so...
by RattusRattus
Sat Jun 01, 2019 4:31 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: [Solved]Problems connecting Waveshare e-Paper 1.54" to RPi
Replies: 4
Views: 163

Re: Problems connecting Waveshare e-Paper 1.54" to RPi

Hi there When asking for help and stating that you have "followed instructions" and something isn't working - please, Please, PLEASE post links to each instruction that you have followed AND post what messages you do get..... it is also helpful to post a link to the EXACT hardware that you are havin...
by RattusRattus
Tue Apr 30, 2019 10:43 pm
Forum: Beginners
Topic: Portable power pack recommendations and esimate on baterry life
Replies: 9
Views: 376

Re: Portable power pack recommendations and esimate on baterry life

given 1.25W for the display then 3.5-4W Load is going to be slightly lower than my projections, so expect slightly better battery life :-)
by RattusRattus
Tue Apr 30, 2019 10:38 pm
Forum: Graphics, sound and multimedia
Topic: I2S DAC (amp) vs USB DAC (amp)
Replies: 1
Views: 301

Re: I2S DAC (amp) vs USB DAC (amp)

there is no better or worse. It all comes down to what you want to do to which is better suited to your needs I also disagree with you completely with your assertion : It can produce better audio than I2S DAC (amp) by having more free space for more components. I2S DAC (amp) cannot be big. This is j...
by RattusRattus
Tue Apr 30, 2019 9:58 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: High-speed I/O between a RP3 and an ARM M7
Replies: 1
Views: 204

Re: High-speed I/O between a RP3 and an ARM M7

Quite frankly the SPI port is about as fast as you are going to get without using USB unles you want to be very creative with the MIPI-CSI (Camera) interface.

/Rattus
by RattusRattus
Tue Apr 30, 2019 8:39 pm
Forum: Beginners
Topic: Portable power pack recommendations and esimate on baterry life
Replies: 9
Views: 376

Re: Portable power pack recommendations and esimate on baterry life

H there, Pi will draw typically a couple of Watts (I have a Pi3 running on a custom hat connected to wired Ethernet drawing 400mA running 24x7 so I am pretty happy with that assertion) The real unknown will be the display - the Raspberry Pi 7" Touch screen data-sheet doesn't give any power details, ...
by RattusRattus
Fri Mar 22, 2019 12:47 pm
Forum: Advanced users
Topic: GPIO c/c++ static library
Replies: 2
Views: 282

Re: GPIO c/c++ static library

Personally I use sysfs and no additional library at all

but common methods for GPIO control are well described here: https://elinux.org/RPi_GPIO_Code_Samples

/Rattus
by RattusRattus
Fri Mar 22, 2019 12:02 pm
Forum: Weather station
Topic: I2C bus seems not to work
Replies: 6
Views: 758

Re: I2C bus seems not to work

Hi there Make sure that you have pull up resistors (to 3V3!!) on both I2C lines.... I2C is needs one (and only one) pull up resistor on the bus so it is common to not include (or jumper out) pull up resistors by default If you are not sure post me a link to the schematics for YOUR weather hat and I'...
by RattusRattus
Fri Mar 22, 2019 11:39 am
Forum: Networking and servers
Topic: Ethernet Adapter RPi Zero Problems
Replies: 1
Views: 331

Re: Ethernet Adapter RPi Zero Problems

Your logs seem to suggest a USB subsystem problem, but other than that... Lets try some basic fault finding 1) is it always the SAME Pis that have this error? You mention that some Pis randomly don't start as expected... is it always the same Pis that fail to start (i.e. does Pi #1 always work but P...
by RattusRattus
Fri Mar 22, 2019 11:15 am
Forum: Automation, sensing and robotics
Topic: Wi-Fi Relay & Raspberry
Replies: 4
Views: 243

Re: Wi-Fi Relay & Raspberry

I am really confused by the following statement:
I want to use relays with wifi module to connect them all without connecting all with cables
That sounds like you want to have relays and no wires :-)

Draw a picture :-)

/Rattus
by RattusRattus
Fri Mar 22, 2019 11:09 am
Forum: Troubleshooting
Topic: using arduino with raspberry pi
Replies: 1
Views: 88

Re: using arduino with raspberry pi

Short answer: Yes Longer answer: Instead of directly reading from a sensor connected to your Pi then pushing to firebase simply read your sensor information from your arduino and post to firebase. what do I mean by this? 1) have your arduino perform sensor readings 2) Have the Pi obtain data from yo...
by RattusRattus
Mon Mar 18, 2019 9:00 pm
Forum: General programming discussion
Topic: Mixing C and assembly?
Replies: 18
Views: 1487

Re: Mixing C and assembly?

Well it also used ARMv8 not ARMv6 instructions so you will gain there as well.....

/Rattus
by RattusRattus
Sun Mar 17, 2019 11:16 pm
Forum: General programming discussion
Topic: Mixing C and assembly?
Replies: 18
Views: 1487

Re: Mixing C and assembly?

links inside the ARM document apear to be dead

you will certainly need the Procedure call standard
http://infocenter.arm.com/help/topic/co ... _aapcs.pdf

/Rattus

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