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Zeile 1: − + − + + − + − The measurements (voltage and current in one) can be made permanently + − + − + − + − + − + − ==Logging==+ − + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + Zeile 24:
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Arduino voltammeter (Quelltext anzeigen)
Version vom 15. Juli 2014, 22:57 Uhr
, 22:57, 15. Jul. 2014→Resistor Values
For the German version go to [[Arduino_VoltAmmeter]]
For the German version go to [[Arduino_VoltAmmeter]]
=General=
=General=
[[Image:AmmeterInBetrieb_Steckplatine.jpg|thumb|ammeter on breadboard]]
[[Image:AmmeterInBetrieb_Steckplatine.jpg|thumb|'''ammeter on breadboard'''
[[Image:AmmeterInBetrieb_Schaltplan.jpg|thumb|ammeter circuitry]]
measuring the voltage of the battery block and the current through the LED]]
[[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.
and also the Fritzing scheme for closer reference; http://fritzing.org/
{{zip|ArduinoAmmeter.zip|112KB|Version from 05.02.2012}}
{{zip|ArduinoAmmeter.zip|118KB|}}
[[Image:DS1307.jpg|thumb|timer DS1307]]
=Resistor Values=
The values of the given resistors are in the breadboard
picture
(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,
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;
for different values of R3 its maximum current.
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
in the archive ArduinoAmmeter.zip.
{| class="wikitable"
|-
! R2 !! U_max !! !! R3 !! I_max
|-
| 50K || 15V || || 0.47 Ohm || 10.6A
|-
| 10K || 55V || || 4.7 Ohm || 1060mA
|-
| 6.8K || 79V || || 47 Ohm || 106mA
|}
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.
=Logging=
[[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.
You can also omit this part (including cables) without affecting the measurement of
You can also omit this part (including cables) without affecting the measurement of
in the log entries.
in the log entries.
'''BEISPIEL (aus SERIAL MONITOR)'''
'''Example (from SERIAL MONITOR)'''
log permanent on
log permanent on
log permanent OFF
log permanent OFF
==References==
My circuit is an adaption of the Renatos blog
=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
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
who himself refers to page
who himself refers to page
http://electronics-diy.com/70v_pic_voltmeter_amperemeter.php, where you can
http://electronics-diy.com/70v_pic_voltmeter_amperemeter.php, where you can
find the kernel circuit doing the measurements.
find the kernel circuit doing the measurements.
[[Category:Projekte]]