On 15/04/2008, Rikard Bosnjakovic wrote: [...] > What I'm looking for is an interface-circuit that can measure volts > and amps and feed to the PIC for updating the segments. Can anyone > recommend me a few IC's with enough resolution (100mV and 1mA) that I > can peek on? I contacted Maxim to see if they could name some chips they had that would help me out. The only reply I got from them was this: "So you are trying to measure the current. How about simply use a current sensing resistor and measure the output differentially?" Current resistor, I think it should be a shunt resistor (only read about them, never used). But I'm not clear of what the representative means by "measure the output differentially". Does it mean this: V_a V_b -----+RESISTOR+----- Convert V_a / V_b using ADC, measure = (V_a - V_b)? Can anyone shed some light on this for me? -- - Rikard - http://bos.hack.org/cv/ -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist