I am planning to make a Power Meter using one of the ADE7xxx devices and a Raspberry Pi processor. Has anyone done that? What would be the best ADE7xxx devices to consider? If possible, I would like it to work for 240/120 Volt Split Phase residential service as well as 3 phase 3 wire and 3 phase 4 wire. Would the ADE7878 be a good choice? What is the difference between the ADE7878 and the ADE7878A?