voltage level for ultrasonic sensor

Thread Starter

ep.hobbyiest

Joined Aug 26, 2014
181
Yeah, i meant to ask about TRIG pin of sensor. I saw some schematic online. So, got confused about this.
They have connected directly 3.3v pin to TRIG pin of sensor.

So, is it really working ? or they might have different changed design?
 

OBW0549

Joined Mar 2, 2015
3,566
Yeah, i meant to ask about TRIG pin of sensor. I saw some schematic online. So, got confused about this. They have connected directly 3.3v pin to TRIG pin of sensor. So, is it really working ? or they might have different changed design?
Who knows? People do all kinds of things. All you can do is buy one of these devices and try it out; it may work at the lower voltage, or it may not, or it may "sort of" work but not very well. Your guess is as good as mine.
 

shteii01

Joined Feb 19, 2010
4,644
Yeah, i meant to ask about TRIG pin of sensor. I saw some schematic online. So, got confused about this.
They have connected directly 3.3v pin to TRIG pin of sensor.

So, is it really working ? or they might have different changed design?
Very Generally Speaking!

The usual setup is:
* 0-0.8 volts is digital zero
* 2.7 or 2.8 volts is digital one

So. If you follow above, you can connect 5 volt system to 3.3 volt device, and they will work. However, some systems and some devices are more sensitive than others. The only way for you to be sure that the two devices will work with each other is to actually connect them and try using them.
 
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