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I’ve seen quite a few questions in the forums on how to add more SPI devices … so I decided to write up one of my Raspberry Pi based data acquisition projects.

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Currently there are 8 channels of 0-4.096V inputs with 1mV resolution, and 16 channels of 0-8.192V channels with 2mV resolution, article has the schematic and Python source.

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Article Index:

1. Introduction, Problems: Conversion Error, Number of Channels, Input Voltage Range, Schematic
2. Software Support, Sample Code, Results, Conclusion

Did you even wonder if the SATA port on a Banana Pi, and a Banana Pro makes a difference?

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Is it really that much faster than USB-SATA converters (like the ones needed for the Raspberry Pi)
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I decided to find out, comparing an SD card, USB-SATA adapters, and SATA drives on a Banana Pi and a Banana Pro.

There are four drives competing here… a 5400rpm laptop drive, a 7200rpm 3TB desktop drive, a slow SSD and a fast SSD.

See https://www.mikronauts.com/banana-pi/banana-pi-pro-sata-and-usb-hard-drive-tests/

My apologies, sometimes I type too fast.

I’ve fixed the title and link for my latest blog post. The corrected URL is:

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Sorry about the double tweet!!!

How fast can a Raspberry Pi 2 file server be?

I thought I’d measure the performance of a Raspberry Pi 2 SMB server… with the on-board 10/100 Ethernet, and a USB Gigabite adapter.

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There have been so many questions on the forums about using the Raspberry Pi 2 as a server – and some unrealistic hopes of gigabit performance – that I ran more tests than I originally intended to pin down the performance limits.

I welcome your feedback on my forums – or the Raspberry Pi Forums!

Article Index

• Introduction, Analysis (Looking for Bottlenecks), USB 2.0, 10/100 Ethernet, Disk Transfer Rate
• But what about RAID?, File Server Software, File System Overhead,  Configuring your Raspberry Pi 2 SAMBA server, Tuning the server, Test Equipment
• Benchmarks, Reading/Writing/Copying large files, Reading/Writing/Copying directory of jpeg’s, Conclusion

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