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Topic: Compensating for lead resistance. (Read 1 time) previous topic - next topic

68tjs

To "THAMER"

Pour écrire en français il y a la partie francophone.
Pour un nouveau sujet on crée un nouveau post.
Pour obtenir plus facilement une réponse c'est mieux de dire "s'il vous plait" et "merci".

To write in French there is the French-speaking part.
For a new subject you do create a new post.
To have better luck getting an answer it's better to say "please" and "thank you."

Welcome to the French-speaking part.

GoForSmoke


je veux commander mon CNC avec une arduino uno . j'ai besoin d'un code source (arduino) pour 3 unipolair stepper motor.



The source code will much depend on parts and connections. But you will do better here:
http://forum.arduino.cc/index.php/board,33.0.html

Sorry but Je ne parles Francais... since 1972.


Nick Gammon on multitasking Arduinos:
1) http://gammon.com.au/blink
2) http://gammon.com.au/serial
3) http://gammon.com.au/interrupts

syphex

Ohms law is only for linearly approximated relations between V I and R. Its not "gods rule" lol. Ohms law can fail they showed us in engineering.

So I guess the verdict is: Just do it the loss in voltage/current whatever isnt really significant for the relay.

GoForSmoke

Newton's Laws wouldn't let us have an accurate GPS but they were good enough to not just get to the moon but to send satellites out to the edge of the Solar system using orbital motion slingshots.

I view Ohm's Law as a relation.

Nick Gammon on multitasking Arduinos:
1) http://gammon.com.au/blink
2) http://gammon.com.au/serial
3) http://gammon.com.au/interrupts

sonnyyu

from DHT11 tech data sheet;-



high light text is "super long transmission range"



recommend ues 5k for <= 20m transmission range, for >20m  adjust R value.
It does not indicate value, but I guess it will be smaller than 5k. OP plan use it at 5m, nothing is needed to do.

syphex

I've been wondering what I can extend my sensor with and I thought about phone cables, they have 4 wires in them so I could just use those?? All I have now is these ~15cm long female to female connectors that look like they're out of a computer but no computer shop knows what they are.

Any advice on soldering the phone lines to my sensor? I want about 3-5m of cable to extend my dht11 or dht22.

sonnyyu


Any advice on soldering the phone lines to my sensor? I want about 3-5m of cable to extend my dht11 or dht22.


Sounds OK to me.

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