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by dauhee
Wed Jul 14, 2021 7:24 am
Forum: Troubleshooting
Topic: Pi 3 - wifi dies when board gets hot
Replies: 12
Views: 486

Re: Pi 3 - wifi dies when board gets hot

So it’s not heat related, because 40C is no heat. At all. And it’s not a bad solder since you replaced the Pi and the new example exhibits the same problem. Poor wireless reception once the cover is shut? Did you compare what iwconfig reports in both cases? Incorrect. Is heat related. I am monitori...
by dauhee
Tue Jul 13, 2021 9:53 pm
Forum: Troubleshooting
Topic: Pi 3 - wifi dies when board gets hot
Replies: 12
Views: 486

Re: Pi 3 - wifi dies when board gets hot

Thanks all. I have a heatsink on order and have made following changes: I had underside of case on pi - I removed that installed cpufrequtils and set to powersave - (I had tried clocking down to 600mhz via config.txt setting of arm_freq=600 but it wouldn't boot, maybe something I was doing wrong the...
by dauhee
Tue Jul 13, 2021 3:30 pm
Forum: Troubleshooting
Topic: Pi 3 - wifi dies when board gets hot
Replies: 12
Views: 486

Re: Pi 3 - wifi dies when board gets hot

CPU is <2% all the time so its not getting over 45 degrees. Works fine outside of box.
by dauhee
Tue Jul 13, 2021 2:56 pm
Forum: Troubleshooting
Topic: Pi 3 - wifi dies when board gets hot
Replies: 12
Views: 486

Re: Pi 3 - wifi dies when board gets hot

LTolledo wrote:
Tue Jul 13, 2021 1:16 pm
what do you mean by "heatsink differential"?

if you dont want to use heatsinks... just run your RPI inside the fridge!
temperature that heatsink will reach versus temperature of air around it . . . .
by dauhee
Tue Jul 13, 2021 1:10 pm
Forum: Troubleshooting
Topic: Pi 3 - wifi dies when board gets hot
Replies: 12
Views: 486

Re: Pi 3 - wifi dies when board gets hot

Thanks, no option for ethernet and ambient temperature of box gets to around 30-40 degrees temp over time so heatsink differential isn't going to do much. Heatsink is worth a try though thanks
by dauhee
Tue Jul 13, 2021 12:17 pm
Forum: Troubleshooting
Topic: Pi 3 - wifi dies when board gets hot
Replies: 12
Views: 486

Pi 3 - wifi dies when board gets hot

Hi All, I have a Pi 3 adding extra functionality to my alarm system. The CPU temp never goes above 45 degrees, but its just the heat spreads out to the rest of the board over time. The box gets hot also, so if I put in a heatsink, I'm not sure it will dissipate the heat. My problem is, during warm p...
by dauhee
Sat Aug 16, 2014 12:46 pm
Forum: Automation, sensing and robotics
Topic: Controlled shutdown on power loss
Replies: 7
Views: 29720

Re: Controlled shutdown on power loss

That is perfect! Hopefully it will be out soon.

The problem with my lipo rider solution is even after detecting power removal and performing shutdown, battery power still drains.

Thank you!
by dauhee
Fri Jun 20, 2014 12:59 pm
Forum: Advanced users
Topic: Encrypt Raspberry Pi's SD Card
Replies: 13
Views: 17507

Re: Encrypt Raspberry Pi's SD Card

I did this about 2 years ago so am rusty! I used the following link primarily: http://www.howtoforge.com/how-to-encrypt-directories-partitions-with-ecryptfs-on-debian-squeeze It will basically encrypt a directory: sudo apt-get install ecryptfs-utils sudo apt-get install cryptsetup sudo ecryptfs-setu...
by dauhee
Mon Dec 16, 2013 8:07 am
Forum: HATs and other add-ons
Topic: NRF24L01 RF Transceiver
Replies: 254
Views: 163327

Re: NRF24L01 RF Transceiver

If you are not receiving anything then might need to verify pin wiring. If it is intermittent, then you could try using an interrupt to raise event on receive
by dauhee
Thu Sep 19, 2013 12:33 pm
Forum: HATs and other add-ons
Topic: NRF24L01 RF Transceiver
Replies: 254
Views: 163327

Re: NRF24L01 RF Transceiver

If they only work on lower mbs then could be interference - could do the scanner test to see whats going on
by dauhee
Fri Sep 13, 2013 12:48 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry and NRF24L01 transceiver device
Replies: 18
Views: 11859

Re: Raspberry and NRF24L01 transceiver device

wow - that is powerful and elegant. Really great product!
by dauhee
Fri Sep 13, 2013 9:59 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry and NRF24L01 transceiver device
Replies: 18
Views: 11859

Re: Raspberry and NRF24L01 transceiver device

as in 2-way communication so that arduino can initiate send/receive and also RPi can initiate send/receive. I had tried that but could only send on one side and receive on the other - if trying to send on either side at random times, messages would be lost.
by dauhee
Fri Sep 13, 2013 9:11 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry and NRF24L01 transceiver device
Replies: 18
Views: 11859

Re: Raspberry and NRF24L01 transceiver device

fantastic - does it support asynchronous communications?
by dauhee
Wed Sep 11, 2013 7:30 pm
Forum: Automation, sensing and robotics
Topic: Controlled Shutdown at Power Failure
Replies: 72
Views: 67446

Re: Controlled Shutdown at Power Failure

I would buy one of these boards!!!!!!!!!!!!!!!!!!!!!!!!!!! I am using a lipo rider pro board to provide ups capability. I did a bit of soldering and can detect when battery is activated - I can then gracefully shutdown. Only problem is the RPi will trickle away the battery even when shutdown as you ...
by dauhee
Mon Sep 09, 2013 7:06 am
Forum: HATs and other add-ons
Topic: NRF24L01 RF Transceiver
Replies: 254
Views: 163327

Re: NRF24L01 RF Transceiver

it can only do one at a time unfortunately. So this means, one has to be a listener, one a sender. But however the sender can listen after it has sent and the listener can then switch to send. I have tried bi-directional and it is not 100% as messages will be lost when trying to initiate randomly fr...
by dauhee
Thu Jul 11, 2013 1:15 pm
Forum: Advanced users
Topic: "UPS" for the Raspberry Pi
Replies: 41
Views: 17273

Re: "UPS" for the Raspberry Pi

yes the 1A is very limiting alright. Could use something like the following if have larger power requirements: http://www.amazon.co.uk/APC-BE700G-UK-Interface-Power-Saving-Back-UPS/dp/B002RXED6A/ref=sr_1_1?ie=UTF8&qid=1373548032&sr=8-1&keywords=apc+ups and use the RPi to monitor it - off...
by dauhee
Thu Jul 11, 2013 12:45 pm
Forum: Advanced users
Topic: "UPS" for the Raspberry Pi
Replies: 41
Views: 17273

Re: "UPS" for the Raspberry Pi

lipo rider pro board + battery is much cheaper and can also detect when on battery.
by dauhee
Tue Jun 18, 2013 2:04 pm
Forum: Automation, sensing and robotics
Topic: UPiS - Uninterruptible Power intelligent Supply
Replies: 51
Views: 21834

Re: UPiS - Uninterruptible Power intelligent Supply

fantastic!

Can you tell me, how does the on/off switch function? Does it cut the power, or is there a way to inform the OS to shutdown first?

Thanks.
by dauhee
Wed Jun 05, 2013 8:04 pm
Forum: Automation, sensing and robotics
Topic: Home Alarm System Retrofit - "Part Deux"
Replies: 26
Views: 29634

Re: Home Alarm System Retrofit - "Part Deux"

hardwiring is good. sensors that use RF433 can be jammed by intruders. The average criminal is getting more sophisticated. Even reed sensors are easily fooled with a strong magnet. Recessed reed sensors are much better because it becomes harder to circumvent. Window vibration is another bit of prote...
by dauhee
Wed Jun 05, 2013 6:57 pm
Forum: Automation, sensing and robotics
Topic: Home alarm system retrofit.
Replies: 36
Views: 22924

Re: Home alarm system retrofit.

fantastic stuff. I am on the same journey for home alarm. I have done similar things.

FYI RPi.GPIO now has interrupts.

Any questions just ask.
by dauhee
Sun Jun 02, 2013 10:29 pm
Forum: Automation, sensing and robotics
Topic: switching wall light on/off causes GPIO interrupt
Replies: 11
Views: 3323

Re: switching wall light on/off causes GPIO interrupt

there is no direct connection. I'm guessing its feeding back to the house mains, through the power adapter and into the RPi. If its not that, then could be picking up EMF or something like that. If you are looking for home automation such as turning ceiling lights on/off via the RPi, then there are ...
by dauhee
Sun Jun 02, 2013 10:26 pm
Forum: HATs and other add-ons
Topic: Battery backup power
Replies: 33
Views: 64268

Re: Battery backup power

if the battery won't supply a charge (empty) and also not taking a charge then it could be defective. Board or connectors could also be faulty. I didn't use the solar panel in my configuration, just using battery as a backup power source.
by dauhee
Sat Jun 01, 2013 2:59 pm
Forum: Automation, sensing and robotics
Topic: switching wall light on/off causes GPIO interrupt
Replies: 11
Views: 3323

Re: switching wall light on/off causes GPIO interrupt

Its saying an edge did happen alright. I must look into a filter capacitor that sounds interesting.
by dauhee
Sat Jun 01, 2013 9:51 am
Forum: Automation, sensing and robotics
Topic: switching wall light on/off causes GPIO interrupt
Replies: 11
Views: 3323

switching wall light on/off causes GPIO interrupt

Hi All, To me, something very strange is happening with my RPi. I have a shake switch and reed switch set up with interrupts waiting for edge detection. They work as expected, however whenever somebody in the house turns on/off a wall light switch, there is a 50% chance that the interrupts will fire...
by dauhee
Fri Apr 19, 2013 7:20 pm
Forum: Automation, sensing and robotics
Topic: Controlled shutdown on power loss
Replies: 7
Views: 29720

Re: Controlled shutdown on power loss

I got a lipo rider pro board from seeedstudio. its perfect. takes mains when available and goes to battery otherwise. has connection for solar power also if so desired. I would have liked it to have more than the 1 amp however as usb devices could consume more than the 300mA remainder. So over-clock...

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