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Arduino voltammeter (Quelltext anzeigen)
Version vom 5. Februar 2012, 23:07 Uhr
, 23:07, 5. Feb. 2012keine Bearbeitungszusammenfassung
{{zip|ArduinoAmmeter.zip|112KB|Version from 05.02.2012}}
{{zip|ArduinoAmmeter.zip|112KB|Version from 05.02.2012}}
==Resistor Values==
The values of the given resistors are in the breadboard
picture
(from left to right) 100K 10K, 0.47 Ohm, 220 Ohm, 100K, 2.2K (twice).
Henceforth, I refer to them as R1, R2, R3, R4, R5, R6 und R7 respectively,
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.
Following table lists different values of R2 and its corresponding maximum voltage;
for differnt values of R3 its maximum current.
Note that R2 and R3 can be chosen independently from
each other.
{| 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
|}
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.
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==
==Logging==
[[Image:DS1307.jpg|thumb|timer DS1307]]
[[Image:DS1307.jpg|thumb|timer DS1307]]