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by Imperf3kt
Thu Jul 04, 2019 12:53 am
Forum: General discussion
Topic: Why doesn't the next Pi add...? Why doesn't the Pi 4 have...? The definitive debunking!
Replies: 68
Views: 2903

Re: Why doesn't the next Pi add...? Why doesn't the Pi 4 have...? The definitive debunking!

RPT is short for Raspberry Pi Trading, the business side of Raspberry Pi Foundation (the charity side)
by Imperf3kt
Wed Jul 03, 2019 9:56 pm
Forum: Beginners
Topic: Raspberry Pi Heatsink for PMIC
Replies: 2
Views: 120

Re: Raspberry Pi Heatsink for PMIC

Your local hardware chain should sell strips of low grade aluminium rod or plating fairly cheap (depending on where you are) A dremil or hacksaw can add slots for fins. Where I live there is a store called "Bunnings" where they sell all sorts of shapes and sizes at 1.2M (enough for dozens of heatsin...
by Imperf3kt
Wed Jul 03, 2019 9:25 pm
Forum: General discussion
Topic: RP4 without ESD protection shipped
Replies: 15
Views: 683

Re: RP4 without ESD protection shipped

ESD baggie that all previous models have shipped in - which usually ends up in landfill as it's unrecycleable :( Not quite fully true. I have a box full of ESD bags, some dating back to the 80s that don't even look like ESD protective bags. I reuse mine for all sorts of electronic bits and pieces, ...
by Imperf3kt
Wed Jul 03, 2019 7:23 pm
Forum: General discussion
Topic: Heatsinks official for rpi 4 ?
Replies: 43
Views: 3198

Re: Heatsinks official for rpi 4 ?

I haven't got any heatsink or fan on my caseless (no cases available at the time) Pi 4B. Running apt-get dist-upgrade took it up to 100% on one cpu core for several minutes and it hit 64°C in ambient 21°C. Gently waving a smallish piece of card over it to get a slight airflow reduced that to 54°C a...
by Imperf3kt
Wed Jul 03, 2019 7:18 pm
Forum: Off topic discussion
Topic: Pi4 price
Replies: 35
Views: 1972

Re: Pi4 price

I think I got the answer I was looking for: none. I'm not the original thread poster though, I just thought this was the most appropriate place to ask about "official" resellers. How much does it cost to add: 1) GPIO pins 2) A serial port 3) PWM output 4) I2C interface 5) SPI interface To the cheape...
by Imperf3kt
Wed Jul 03, 2019 7:07 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 284
Views: 53405

Re: Raspberry Pi 4 temperature

Hello would a Raspberry Pi Power over Ethernet (PoE) HAT v2.0 work on the Pi 4 ? If so would this help with the heat issue . Apologies if this is a repeated question as i did search but could not find a similar question. It will work (was stated in the Pi4 launch blog) and additionally is actually ...
by Imperf3kt
Wed Jul 03, 2019 7:02 pm
Forum: General discussion
Topic: A question about power
Replies: 7
Views: 271

Re: A question about power

Use the highest voltage needed as the power supply. I'd just use 12v as its within the range of all accessories. Then use a 5v regulator to power the Pi, and power the other items directly from the 12. Only thing you need to ensure then is that the power supply can supply enough current for everythi...
by Imperf3kt
Wed Jul 03, 2019 6:48 pm
Forum: General discussion
Topic: Ever be an Industrial rated PI?
Replies: 6
Views: 204

Re: Ever be an Industrial rated PI?

compute module.

Also, all the parts on a Pi are rated to operate between -40 and +85, so I don't see the issue. Maybe the new Pi4b, which specifically states an ambient maximum operating temperature of 50 degrees, but you just need to add cooling as the Pi itself is still rated to +85
by Imperf3kt
Wed Jul 03, 2019 8:44 am
Forum: Beginners
Topic: "Remaking" old RC car with Pi Zero (L298N & ...power?)
Replies: 17
Views: 302

Re: "Remaking" old RC car with Pi Zero (L298N & ...power?)

How are you giving it 3.5v, I don't know of any battery technology or combination of that would give 3.5v, are you sure you do not mean 4.5v? (3xAA)
by Imperf3kt
Wed Jul 03, 2019 8:24 am
Forum: Beginners
Topic: "Remaking" old RC car with Pi Zero (L298N & ...power?)
Replies: 17
Views: 302

Re: "Remaking" old RC car with Pi Zero (L298N & ...power?)

The following is only guesstimates, you'll have to do actual testing to be sure of the figures. Working on a 150mAh figure, assuming only the Pi is powered by the powerbank and the motor/s have their own power supply, you should be able to get several hours from a small 2000mAh powerbank. They're no...
by Imperf3kt
Wed Jul 03, 2019 8:16 am
Forum: Beginners
Topic: "Remaking" old RC car with Pi Zero (L298N & ...power?)
Replies: 17
Views: 302

Re: "Remaking" old RC car with Pi Zero (L298N & ...power?)

The problem with powerbanks is that they are quite bulky. Also i keep looking for a way to perhaps set up some rechargeable supply for the PI (its own thing like a lipo battery of sorts), but that requires extra components. By its very definition, a powerbank is a rechargeable li-po (or Li-ion) bat...
by Imperf3kt
Wed Jul 03, 2019 8:10 am
Forum: Beginners
Topic: First project: Powering DC motor
Replies: 9
Views: 219

Re: First project: Powering DC motor

For what it's worth, I've successfully run a bunch of motors with the Pi with nothing more than a transistor (or mosfet), a diode and a 1k resistor.
I also add a capacitor.

Use a separate source for power. The transistor switches the power on or off.
by Imperf3kt
Wed Jul 03, 2019 8:07 am
Forum: Beginners
Topic: "Remaking" old RC car with Pi Zero (L298N & ...power?)
Replies: 17
Views: 302

Re: "Remaking" old RC car with Pi Zero (L298N & ...power?)

Power it from 3 1.5V batteries. My zero w works fine with 3.5v on power pins(w/o cpu load, from lab psu, min power consumption 150ma). Seems it has ULDO on board. 3 1.5v batteries only equally 4.5v nominal, 0.25v below the minimum required voltage (and 0.5v below the recommended voltage) I would no...
by Imperf3kt
Wed Jul 03, 2019 8:03 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 748
Views: 63864

Re: Raspberry Pi 4 Thread - general discussion

Very true! but 2/3rds down it shows the overclocked ones, some hitting 40. I hope we have this ability on the PI 4 to crank it up.... Clearly I haven't been paying attention, I didn't realize you could get such a huge boost by overclocking the SD memory on the Pi3. I'm amazed that 40 MB/s is possib...
by Imperf3kt
Wed Jul 03, 2019 3:59 am
Forum: Gaming
Topic: Pi4, Handheld and PS2
Replies: 9
Views: 692

Re: Pi4, Handheld and PS2

You may wish to start with a simpler project, there's too many things with a handheld that you need experience about. The Pi4 for example, in an enclosure can reach its thermal maximum quite easily and throttle, hurting performance and possibly your hands. Then there's batteries to think about, spea...
by Imperf3kt
Wed Jul 03, 2019 3:52 am
Forum: Advanced users
Topic: Extreme cooling for Raspberry Pi 3
Replies: 4
Views: 372

Re: Extreme cooling for Raspberry Pi 3

with your kind of ambient temps, you may want to look into a thing called peltier device (sometimes called thermoelectric cooler).... Been there, tried that. With a cheap TEC rated for a thermal delta of 70°C, I found a Pi with TEC, aluminium heat spreader and 12v fan (to cool the large heatsink on...
by Imperf3kt
Wed Jul 03, 2019 3:14 am
Forum: Off topic discussion
Topic: Pi4 price
Replies: 35
Views: 1972

Re: Pi4 price

If the exchange rate were the only influence, the Australian dollar would have had to drop by 24.4c to account for an $11 increase, but it didn't. It rose by 1 cent. It looks more like they are putting their own price on the Pi, not equal to $35USD - something I'd expect of a 3rd party retailer, but...
by Imperf3kt
Wed Jul 03, 2019 2:22 am
Forum: Off topic discussion
Topic: Pi4 price
Replies: 35
Views: 1972

Re: Pi4 price

What's the RPT's policy regarding official resellers prices. Since launch, I've noticed the Pi4b has changed price from my local official resellers. The 1GB version has increased by $4 The 2GB version has increased by $11 The 4GB version has dropped by $2 I understand that, being retailed at USD, th...
by Imperf3kt
Wed Jul 03, 2019 1:52 am
Forum: General discussion
Topic: Cheap but effective PI 4 heat sink
Replies: 22
Views: 1921

Re: Cheap but effective PI 4 heat sink

Gavinmc42 wrote:
Wed Jul 03, 2019 1:12 am
Wonder how a bot of cutup aluminum soft drink can would go?
I have some old ozzie 1 and 2 cents coins somewhere, 9 cent heatsink :D
Aluminium cans are worth 10 cents each thanks to that rediculous tax they introduced last year.
It's not cost effective to even experiment.
by Imperf3kt
Tue Jul 02, 2019 11:55 pm
Forum: General discussion
Topic: Cheap but effective PI 4 heat sink
Replies: 22
Views: 1921

Re: Cheap but effective PI 4 heat sink

Heckle0 wrote:
Tue Jul 02, 2019 10:48 pm
The canakit.com one that i ordered came with 3 heatsinks. I'm not sure where the 3rd one goes.
Big one goes on CPU. Slightly smaller one goes on RAM. But the 3rd one is even smaller. Could go to power chip, ethernet, or usb.
Where do i put this thing?
Sounds like a kit for a Pi3
by Imperf3kt
Tue Jul 02, 2019 8:14 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 284
Views: 53405

Re: Raspberry Pi 4 temperature

To be perfectly fair, the Pi4b was said to be capable of being used as a desktop PC. If we look at any desktop PC from the last two decades, every single one of them has a heatsink and fan, why should the Pi be different 🤣
by Imperf3kt
Tue Jul 02, 2019 5:38 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 748
Views: 63864

Re: Raspberry Pi 4 Thread - general discussion

Purely out of curiosity, what are the Pi4's extra components around the audio jack? PWM drivers and a stabilised power supply? How is the Pi4's audio quality compared to previous models? LHS: Pi3B+ RHS: Pi4 pijacksmall.jpg Just a guess, but it looks to me like the extra componentry there is related...
by Imperf3kt
Tue Jul 02, 2019 3:53 am
Forum: Off topic discussion
Topic: Pi4 price
Replies: 35
Views: 1972

Re: Pi4 price

Are you honestly complaining about $3?

Where did you pull $42 from? Why do you think the Pi4b2 should cost $42USD

Wish I could buy a 2GB Pi4b for $45, where I live, the official resellers charge $66-$67 and the 4GB model is $96-$97, about 11% of my wage.

(before postal costs)
by Imperf3kt
Tue Jul 02, 2019 3:34 am
Forum: Off topic discussion
Topic: Original Model B price?
Replies: 27
Views: 2956

Re: Original Model B price?

Now how am I going to do that, it is not my photo, so not my rite to modify. Editing the photo for review or commentary is covered under international fair use laws. You do have the right to add a red circle or other markings in aide of your discussion about said image. I simply ask because you are...
by Imperf3kt
Tue Jul 02, 2019 3:08 am
Forum: Off topic discussion
Topic: Original Model B price?
Replies: 27
Views: 2956

Re: Original Model B price?

This topic is about a revision 1 Pi1b though.

I still do not see the mounting holes in either the linked ebay sale, nor the Wikipedia image.

Can you please circle where these holes are, not describe where they are.

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