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Zeile 17:
Zeile 17: − + − + − With those given values a maximum voltage of 55 Volt and+ − a maximum current of 10.6 Ampere can be measured. For different voltages+ − choose a different R2, für different currents a different R3.+ + Zeile 46:
Zeile 47: − In case you choose a different value you have to adapt that in the Arduino source, respectively, − Regarding R2, modify the initialization of variable V10K_RESISTOR, − for R3 the variable I0_47_RESISTOR. Zeile 73:
Zeile 71: + + + + + + +
Arduino voltammeter (Quelltext anzeigen)
Version vom 15. Juli 2014, 22:57 Uhr
, 22:57, 15. Jul. 2014→Resistor Values
and also the Fritzing scheme for closer reference; http://fritzing.org/
and also the Fritzing scheme for closer reference; http://fritzing.org/
{{zip|ArduinoAmmeter.zip|118KB|Version from 05.02.2012}}
{{zip|ArduinoAmmeter.zip|118KB|}}
=Resistor Values=
=Resistor Values=
The values of the given resistors are in the breadboard
The values of the given resistors are in the breadboard
picture
picture
(from left to right) 100K, 10K, 0.47 Ohm, 220 Ohm, 100K, 2.2K (twice).
(from left to right) 100K, 50K(10K/6.8K), 47(0.47/4.7) Ohm, 220 Ohm, 100K, 2.2K (twice).
Henceforth, I refer to them as R1, R2, R3, R4, R5, R6 und R7 respectively,
Henceforth, I refer to them as R1, R2, R3, R4, R5, R6 und R7 respectively,
The values of R2 and R3 depend from the range you are taking measurement. To decide their proper
value use the table below. Note that you must adapt also the Arduinocode accordingly;
R2 refers to variable '''V10K_RESISTOR ''' and R3 is '''I0_47_RESISTOR'''
Following table lists different values of R2 and its corresponding maximum voltage;
Following table lists different values of R2 and its corresponding maximum voltage;
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The value of the resistors R6 und R7 (here given as 2.2K) need not to be exactly like that,
The value of the resistors R6 und R7 (here given as 2.2K) need not to be exactly like that,
log permanent OFF
log permanent OFF
=Accuracy=
Alas, the values are not too accurate. Check out discussion and proposals
for bettery accuracy at following link
http://arduino.cc/forum/index.php/topic,140203.0.html
For one thing you can lower the resistor values when it is safe for your
application.
=References=
=References=