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Activities/Turtle Art/Using Turtle Art Sensors (view source)
Revision as of 01:20, 5 December 2010
, 01:20, 5 December 2010→Measuring DC Amps
==Measuring DC Amps==
==Measuring DC Amps==
The current flowing in a DC circuit can be measured by measuring the voltage accross a series resistor. The resistor value is chosen so that the voltage across it is within the measurement range of the XO (0.4-1.8V XO1, 0.17V-3.0V XO1.5) and as low as possible consistent with that to minimise influences on the measured circuit.
The current flowing in a DC circuit can be measured by measuring the voltage accross a series resistor. The resistor value is chosen so that the voltage across it is within the measurement range of the XO (0.4-1.8V XO1, 0.17V-3.0V XO1.5) and as low as possible consistent with that to minimise influences on the measured circuit.
Shown below, a XO1.5 is measuring the DC charging current of a XO1.0. The voltage is measured across a 0.8 ohm series resistor. The phono plug of one laptop has an inbuilt 680 ohm series resistor to protect against excessive voltage, the power plug of the other laptop has an inbuilt series diode to protect against reverse voltage.
[[File:Schematicdccurrent.jpg]]
==Importing Logged Data into other Activities==
==Importing Logged Data into other Activities==