This is a simply cheap solution to calculate Energy consumed by your gears..But still the accuracy i have not tested..Buy a module as shown below with ACS712 and please make sure of the current rating according to your requirement. The module has one Vcc, one Gnd and one Vout pins so simply you connect the Vout pin to any Analog input of Arduino and power up the module from Arduino. But don’t forget to change the analog pin no in the provided sketch.. /*…
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