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3 items tagged "ac signal"

Related tags: signal [+], hacks [+], us patent application [+], protocol [+], monitoring [+], monitor [+], microcontrollers [+], lm358 [+], ir detector [+], house [+], home automation system [+], home [+], heart rate monitor [+], fingertip [+], engineering [+], debraj [+], deb [+], classic [+], arpad [+]

February 04, 2012
11:01
Reverse Engineering an AC Signal Protocol
» ‎ Hack a Day

[Arpad] has spent quite a bit of time reverse-engineering a home automation system, and, as he is quick to point out, presents the information learned for informational purposes only. He’s really done his homework (and documented it well), looking into the US patent application, and figuring out how the protocol works. If you’re wondering how [...]
Tags: protocol signal engineering arpad home-automation-system us-patent-application ac-signal home hacks
February 17, 2011
10:00
Fingertip heart rate monitor
» ‎ Hack a Day

[Embedded lab] has a nice tutorial on building your own heart rate monitor. The monitor works by shining infrared light into the fingertip and looking at the changes in the reflected infrared signal caused by a heartbeat. The IR detector produces a very small AC signal so a couple of op-amps are used to filter and amplify the signal. [...]
Tags: fingertip signal monitor heart-rate-monitor ir-detector ac-signal microcontrollers
July 07, 2010
12:00
Whole house current monitoring
» ‎ Hack a Day

[Debraj Deb] put together a current monitoring device that interfaces with the circuit box at his house. The system is controlled by a PIC 18F4520 and uses an LM358 Op-Amp to rectify the AC signal, as well as an MCP6S21 for range adjustments for detecting both high or low current loads. The data displayed on [...]
Tags: debraj house monitoring deb lm358 ac-signal classic hacks