I'm a software guy and am dabbling a bit with arduino recently. I don't understand many things when it comes to taking a circuit board schematic and doing it in real life.
For instance, at this tutorial: http://blog.makezine.com/projects/make-34/the-dryer-messenger/, I don't understand what to do with this: (that is how I build out the circuits that he's describing in these bullets or in the schematic attached to the post.)
- Since the dryer runs on AC, current flows in both directions, causing the voltage to swing positive and negative. The Arduino can only sample positive voltages, so I used a voltage divider to bias the sensor’s output. The volt- age divider uses two 10K resistors (R1 and R2) to obtain 1.65V from the 3.3V supply.
- The current sensor has a fairly linear output up to 1V at 30A, which means the Arduino will read 0.65V or 2.65V when the sensor sees 30A. Capacitor C1 goes between the sensor and the Arduino to filter out noise.
I would really appreciate a simpler schematic and some understanding of what's going on.