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I recently adapted my 2 channel temperature datalogger to record temperatures in my household heating system. I wasn't satisfied with reading back a file from the SD card in order to analyse the data; I wanted a near real-time graph in Excel, on my PC. I could have used gobetwino - see my previous post, but it is a bit tortuous.   I invested in an Ethernet Shield and added a webserver to my data logger. Each time a web client requests data, the SD card file is opened and the data streamed ...