Hi experts,

I want to connect ultrasonic distance sensor to Whisper Node, running on CR2032 battery, and make periodical measuring (to check the garage door status).
I found out that HC-SR04 is running on 5v and Whisper Node can supply only 3.3v. I've ordered some level converters/shifters by amazon


but it seems they are designed to be used between two active systems, where both systems' supplied voltages should be connected to the board, so it isn't suitable solution for me (I have no 5v source).
Last night I've tried to find out how to increase voltage from 3.3 to 5v, found some clues, but is it really only possible with transistor, like 2N3904 or mosfet?
Seems to be not so easy to implement.

Hello,

Try using the US 100 Ultrasonic sensor. This should be compatible with 3.3V: https://www.bananarobotics.com/shop/US- ... sor-Module

kosmo.de wrote: ↑

Aug 10, 2018

I've found that there are some modified version from manufacturers:
https://www.ebay.de/itm/Micro-Mini-3-3- ... 3281177316
https://www.sgbotic.com/index.php?dispatch=products.view&product_id=1855here
https://www.ebay.de/itm/3V-5-5V-HC-SR04 ... 7#shpCntId

I've ordered two of the first one, will see how it works with Whisper Node.

These sensors are not so cheap, but this solution removes some headache.
Still, would be nice to know if how it is possible to use cheaper sensor with 3.3V MCU (for curious ones).

I hope my message will find you.

You left your message in 2018. It is now 2024. After all these years, what can you say about the performance of these devices?