Forum >Replies by Sakari
Replies （2）
- Topic: Operation Neko HunterYou Reply: Hi,
Sharp ir rangefinder seems to simply output voltage in a range of 0.5-2.5 V. You need to plug it to analog in port.
If you're not familiar with analog input -things, you might want to read these arduino examples. In these they just use potentiometer and Light-resistive diode to control led blink rate, but rangefinder controlling more complicated logical system works basically the same way.
Analog Input Just the wiring. 5V operating voltage is good for this rangefinder, too.
Calibration You want to calibrate the sensor too, because it's not 0-5V as potentiometer would be, it's 0.5-2.5V.
And yep, they are arduino examples, board looks different and is blue, but all the ports are the same.
Hope this get's you a bit further. - You Reply: Hi,
[quote="Jonsav"]
Can I control a blind motor with relays of shield? It works with 230V 50Hz, 1A for 210W.
[/quote]
Well 1A at 230V is actually 230W. Let's just assume that the motor takes 230W. And that is AC motor (as you mentioned the frequency.)
Then let's see what the datasheet of the relay board says.
[quote]
Max Switching Voltage AC 240V / DC 60V
Max Switching Current 5A
Max Switching Power AC 360VA / DC 90W
[/quote]
This means that if you connect DC load to the relay, it must be no more than 60V, 5A OR 90W. So, imaginary 100V 50W (DC) gadget should not be connected, as 100>60.
Spesification for alternating current load is 240V, 5A and 360VA. If you haven't been sleeping in the physics lessons, you should know that VA = V*A = W.
So back to your case, where you want to control 230V, 1A, 230W AC motor with this relay.
230V < 240V
1A < 5A
230W < 360VA
So this means, yes you can. And the relay could actually take 130W more load, but it's just good to have some headroom here.
However, please check my calculations and prove if im wrong. I couldn't find the relay's datasheet, so my calculations are done with the spesification on the [url=https://www.dfrobot.com/wiki/index.php?title=Relay_Shield_for_Arduino_(SKU:DFR0144)]shop page[/url]. Also, be aware of risks of high voltages.
[quote="Hector"]
I'm not sure how you get 360VA=270W. I didn't know there was a conversion for this.
[/quote]
That calculation is wrong. But as I said, W = A * V.
[size=6pt](Sorry If I dug an old topic up, if you don't tolerate that here please let me know. And send the answer to Antonio if you are evil enough to remove my post...)[/size]
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Sakari.