- Wed Jun 22, 2011 6:04 am
#129144
Right now I can tolerate a lot of error. At first I only want my program to be able to determine 3 things about the motor I'm monitoring. Is it off (0 amps in CT), is it running normally (about 7 amps in CT) is it stalled (about 50 amps in CT). In the future I may want more accuracy so I can tell if my motor is working harder then normal, but I also have some pressure transducers, so I'll probably just use those to answer that question. If I didn't mention it earlier, this motor is a 1.5HP 230 volt motor for a pool pump. I'm also measuring two pressure transducers (4-20mA converted to 1-5 V with resistor) and two thermocouples. I'm using Analog Devices AD8495ARMZ to convert the thermocouple output to a linear DC voltage. The power supply I have is 12 VDC. The Xbee will be plugged into a Xbee Simple Board (http://microcontrollershop.com/product_ ... ts_id=2366) that can accept a 12 volt input and has a built in voltage regulator that converts the 12 volt to 3.3 volts for the Xbee. So I can supply an op amp with 12 volts if necessary. The Xbee is transmitting the data to an Arduino, which is where all the math and logic will be. The Arduino will also send the data to pachube.com and maybe a Google Docs spreadsheet. There won't be any PC involved.