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Trinket Air Quality Sensor

Source code is on GitHub. Ceramic cap is 104M, base resistor is 500 ohms, switch resistor is 1k. Electrolytic is 47 micro-farads With the recent wildfires here in California and the on-going Covid crisis making us all stay indoors, indoor air quality has become a very important consideration. Working in a back bedroom all day…

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Using Ohmite Force sensitive potentiometers.

Force sensing potentiometers offer an alternative to mechanical potentiometers and rotary encoders. These devices do away the mechanical action of the switch and instead offer a touch sensitive alternative. After looking around the web I was not able to find a suitable library for implementing these devices so I ended up creating my own for…

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Securing Local IoT Devices

The goal of my development efforts has been the implementation of an IoT framework for  embedded devices that requires no connection to the cloud. I want a framework that I can use within my firewall that does not need to connect anywhere. I can then allow only the data I want to make it to…

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Using the ZS-042 module

July 2021 The ZS-042 module is a very cheap DS3231 breakout board. Common on eBay and  Amazon units can be had for less than a dollar. It is a bonus that the module comes with a 4K eprom as well.  In my experience these units work well as a clock but damage the LIRC2032 battery…

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