Congratulations Dave Schulpius, for answering the question and has received an EZ-Credit award! Share what you have learned and create a tutorial to help others by clicking here.

5v Inline Regulators For Sensors And?

Assistance Requested

Help Richard R with their question and receive $10 of EZ-Credit to get more robots and parts from our store. The following information was provided about their previous efforts searching tutorials for a resolution.

Richard R claims to have checked these sources:

I know sensors like pings and IR will need a 5V regulator inline if you put more than 5V through the V4 board... Just noticed my sabertooth motor controller also uses a 5V input line in addition to the signal line and ground line... Does this mean even motor controllers will need a 5V inline reg as well? I tried removing the +5V wire from the sabertooth (in other words just leaving the signal and ground attached) and it still seem to work fine at controlling motors... Just wondering what will need 5V regulators and what won't...


I have found a few conversations, tutorials and activities that may help with your question. Take a look at these links. I've sorted them by what I believe to be most relevant but that is not always the case as I'm still learning.

Also, consider reviewing the Learn section for informative lessons and activities. Check it out!



Take another look look at the manual for your Sabertooth. I think you'll find that that 5v connector on the signal side is an "output" connector. The 5vdc is created right on the Sabertooth by it's own power converter. You can use this output voltage to power other units that need 5vdc right from your Sabertooth. Winky


Well, that makes sense... LOL... Now I at least know the +5V connector on the sabertooth is 5v tolerant... Duh.... Thanks Dave


Easy mistake to make, I've seen posts from others about other controllers that also have +5V outputs (and the sabertooth) where they have assumed they are to be supplied with +5V. And I'm not surprised, a lot of other things have +5V which is their supply in.

But it's a good example of why you should always check and double check the datasheets Smile


I do feel a little stupid now for not reading the manual thoroughly... If not for my curiosity and thanks to Dave I might have blindly plugged my sabertooth into the v4 board with a much higher voltage on the output pins...I was actually in the process of making a custom 5v cable for plugging in sensors to the v4 board...
User-inserted image


If you learnt from it then it's not a bad thing. We learn by making mistakes Smile


Don't feel stupid. Heck, I hooked the 5vdc port pin into that same "output" connector on the Sabertooth the first time I wired them both together. Thank goodness nothing bad happened when I powered it all up. *eek* I caught it later when nothing was working like expected and I reread the manual. *blush*


Good work , just a tip , keep a bag of heatshrink handy. It makes insulating custom wiring easier and safer than tape. It gives your wire a professional look too. Smile


I was making an inline 5v sensor cables when I had noticed my sabertooth still connected to 5v pin on the ezb .... Thanks Rich


Not finished the cable yet... but I did forget the heatshrink... will definitely insulate the connections... I have lots more to make so I will be sure not to forget the heatshrink... Thanks