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Remaking the PDP-8/I using the Pi, simh & a replica front panel
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PiDP-8/I

Oscarv

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71.7k
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622
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76
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262
A "dataless" Wi-Fi positioning system that can be used anywhere GPS can't.
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SubPos Positioning System

Blecky

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36k
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418
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34
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197
DIY System on Chip based on FPGA, priced below 5 USD
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DIPSY

Antti Lukats

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33.1k
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597
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33
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186
A handheld, battery powered, sensor array unit for environmental monitoring focused mostly on air quality using a global infrastructure.
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Portable environmental monitor

Radu Motisan

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52.7k
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315
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34
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169
Monitoring soil moisture at different depths to determine when to irrigate, and - more importantly - how much water is needed. Save 25%!
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22.4k
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1k
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38
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151
Build your own nervous system!
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NeuroBytes

zakqwy

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13.5k
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116
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42
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98
A wheelchair attachment that allows any wheelchair to be powered in a rowing motion. It is 3D printable, open source, and available to all.
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Hand Drive

Kate Reed

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11.5k
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479
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16
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95
Turns your BeagleBone Black/Green into a 14-channel 100Msps Logic Analyzer
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BeagleLogic

Kumar, Abhishek

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11k
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584
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24
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72
wearable UV Index & weather sensor
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UV-badge

x-labz

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4.3k
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28
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4
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A system of interchangeable parts for thermal management in PCB assemblies.