[TC] Electronics Engineers Wedding Invitation Card

Next up in the progress towards our ultimate geek wedding are the wedding invitations! Not content with plain old paper invitations my fiancée Mara and I smashed our geeky heads together to come up with a design that keeps with our circuits and swirls theme. We decided to be more literal, by putting actual circuits into our invitations! However, time spent on design, production and cost...

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[TC] Breathalyzer circuit using 8051

Alcohol Breathalyzer circuit using 8051 Microcontroller (AT89S51). This article is about a breathalyzer circuit using 8051 microcontroller which outputs the blood alcohol content (BAC) from the breath. The BAC is displayed in percentage on a 3 digit seven segment display. The microcontroller used if AT89S51 which belongs to the 8051 family and the alcohol sensor is MQ135 gas sensor from Futurelec. MQ135...

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