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Zeile 5:
Zeile 5: − + − The measurements (voltage and current in one) can be made permanently + − + − + − + − + − ==Resistor Values==+ − + − 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 differnt 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. − ==Logging==+ Zeile 74:
Zeile 72: − + + + + + + + +
Arduino voltammeter (Quelltext anzeigen)
Version vom 15. Juli 2014, 22:57 Uhr
, 22:57, 15. Jul. 2014→Resistor Values
[[Image:AmmeterInBetrieb_Schaltplan.jpg|thumb|'''ammeter circuit diagram''']]
[[Image:AmmeterInBetrieb_Schaltplan.jpg|thumb|'''ammeter circuit diagram''']]
I describe a volt-amperemeter using Arduino microcontroller.
I describe a voltmeter and an ammeter using an Arduino microcontroller,
measuring voltage and current simultanenously, all in one circuit.
(for instance every second).
These measurements can be made permanently (for instance every second).
In picture ''ammeter on breadboard'' you see at the
In picture ''ammeter on breadboard'' you see at the
''input'' a battery block and at the ''output'' a LED
''input'' a battery block and at the ''output'' a LED
with its safety resistor. These two components can be
with its safety resistor. These components can be
replaced by any two power source and current consumer
replaced by any power source and current consumer
respectively, as long as they are in a certain range.
respectively, as long as they are in a certain range.
In following attachment you find the Arduino code, the DS1307 library
In following attachment you find the Arduino code, the DS1307 library
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=
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;
for differnt values of R3 its maximum current.
for different values of R3 its maximum current.
Note that R2 and R3 can be chosen independently from
Note that R2 and R3 can be chosen independently from
each other. To calculate different values you may use the Libre Office calc file contained
each other. To calculate different values you may use the Libre Office calc file contained
|}
|}
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,
for instance a value of 4.7K worked as fine. There is nothing to adapt in the code in this case.
for instance a value of 4.7K worked as fine. There is nothing to adapt in the code in this case.
=Logging=
[[Image:DS1307.jpg|thumb|'''timer DS1307''']]
[[Image:DS1307.jpg|thumb|'''timer DS1307''']]
Time and Date information is delivered by DS1307 break out board.
Time and Date information is delivered by DS1307 break out board.
log permanent OFF
log permanent OFF
==References==
=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=
My circuit is an adaption of Renatos blog
My circuit is an adaption of Renatos blog
http://rexpirando.blogspot.com/2011/03/arduino-volt-ammeter-part-1-breadboard.html
http://rexpirando.blogspot.com/2011/03/arduino-volt-ammeter-part-1-breadboard.html