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  1. Hello everyone, and thanks in advance for reading this! On a current project, I’m working with a network of Arduino UNOs R3, each with an AnalogShield installed (to be precise, it’s 4 Arduinos+AnalogShields total, communicating over I2C). I immediately found a problem when I connected all their Vin ports together to a 12V power supply: they sourced too much current (my main power supply was reading more than 1 A!). So I quickly stopped that and tried connecting the 5V ports together to a 5V power supply. At first this was OK, but soon they started to source too much current again.