Elektor Electronics, January 2008

CO₂ Measurement
Too high a concentration of CO₂ leads to feelings of tiredness, disturbs concentration, and causes headaches. The CO₂ meter described here makes it easy to determine the concentration of carbon dioxide in the air. A microcontroller monitors the measured value and can trigger an alarm or start up a ventilation system when a preset threshold is exceeded.

Economical with Energy
Handy energy meters are available that can just be plugged into a power point and then indicate on a display how much power the appliance uses. How accurate are these meters and what can you actually measure with them? We examined a few of these meters in the Elektor laboratory.

Anti-Standby Switch
Energy Saving may well be a must-have feature for home entertainment products sold today but there are still millions of older and even not-soold appliances that are guzzling far too much juice in the all too convenient standby mode. The anti-standby switch described here saves the planet's energy -- and yours too!

Versatile DC Power Meter
This compact DC power supply instrument module can be used with new supplies and older types lacking this capability. And thanks to microcontroller technology, it offers some bonus features.

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