For Sale: OpenCPN Raspberry Pi Plotter Project Kit

[jefndeb]

Hello,

I bought most of the stuff needed to make my own GPS Chartplotter with a Rasberry Pi but decided to go a different direction.

There is so much free software out there now that works with these mini computers is amazing...and many YouTube instructional videos that walk you through it....I wish I had the time...

Here is what is up for grabs..pretty much all you need depending on your set-up.

Raspberry Pi 3 - Model B Plus
Raspberry Pi Power supply
SmartiPi Touch 2 Case
Raspberry Pi 7" Touch Screen Display

Price is $125 plus $10 USPS shipping

Payment via paypal

Thanks for looking

[yalla]

or you can get a similar setup with the new raspberry pi 4 for the same price from amazon.

[conachair]

Originally Posted by yalla

or you can get a similar setup with the new raspberry pi 4 for the same price from amazon.

With quite a substantial increase in power consumption unfortunately. B3+ is plenty fast enough.

[steffan]

Power consumption comparison
https://www.pidramble.com/wiki/bench...er-consumption

Raspberry Pi 4 B
Pi State Power Consumption
Idle 540 mA (2.7 W)
ab -n 100 -c 10 (uncached) 1010 mA (5.1 W)
400% CPU load (stress --cpu 4) 1280 mA (6.4 W)

Raspberry Pi 3 B+
Pi State Power Consumption
Idle 350 mA (1.9 W)
ab -n 100 -c 10 (uncached) 950 mA (5.0 W)
400% CPU load (stress --cpu 4) 980 mA (5.1 W)

[conachair]

Originally Posted by steffan

Power consumption comparison
https://www.pidramble.com/wiki/bench...er-consumption

Raspberry Pi 4 B
Pi State Power Consumption
Idle 540 mA (2.7 W)
ab -n 100 -c 10 (uncached) 1010 mA (5.1 W)
400% CPU load (stress --cpu 4) 1280 mA (6.4 W)

Raspberry Pi 3 B+
Pi State Power Consumption
Idle 350 mA (1.9 W)
ab -n 100 -c 10 (uncached) 950 mA (5.0 W)
400% CPU load (stress --cpu 4) 980 mA (5.1 W)

If you stick an ammeter on both of them with 'normal' day to day use, the 4 pulls a fair bit more current. Enough to be a factor with a system that's likely running 24/7. The 4 is lots faster, though the 3B+ is plenty fast enough for nav/sigK.

[steffan]

Originally Posted by conachair

If you stick an ammeter on both of them with 'normal' day to day use, the 4 pulls a fair bit more current. Enough to be a factor with a system that's likely running 24/7. The 4 is lots faster, though the 3B+ is plenty fast enough for nav/sigK.

What kind of differences are you seeing? I expect to leave signal K running on my boat when unattended, but I also want to run Plex server & client, for which I find the 3 inadequate. I could keep the 3 for OP and add the 4 for Plex when needed, but that seems like a hassle when the 4 supposedly underclocks itself automatically when appropriate. I'm curious what you see in the real world, as actual data would be better than my guesses.

[conachair]

Originally Posted by steffan

What kind of differences are you seeing? I expect to leave signal K running on my boat when unattended, but I also want to run Plex server & client, for which I find the 3 inadequate. I could keep the 3 for OP and add the 4 for Plex when needed, but that seems like a hassle when the 4 supposedly underclocks itself automatically when appropriate. I'm curious what you see in the real world, as actual data would be better than my guesses.

Sorry, can't find the plots at the moment, I'll redo over the next few days. My Pi3 has a hifiberry amp on top so doubles as music/radio onboard, works great and very low power, maybe 100mA for the hifi amp.