working srf05 with 3.3V

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hasanzadeh99
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Posted by hasanzadeh99: Sun. Feb 20, 2022 - 03:32 PM
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Hey there

is it possible to work with SRF05 module in 3.3V?

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Learning and Information, General Electronics
Last Edited: Sun. Feb 20, 2022 - 05:31 PM
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Heisen
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Posted by Heisen: Sun. Feb 20, 2022 - 03:38 PM
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Do you have 5v rail in your system somewhere or just 3.3v only?

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hasanzadeh99
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Posted by hasanzadeh99: Sun. Feb 20, 2022 - 03:42 PM (Reply to #2)
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all of system work with 3.3V

my MCU is stm32

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grohote
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Posted by grohote: Sun. Feb 20, 2022 - 04:00 PM
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It is the /almost/ same circuit as SR04, so: 5V only.

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hasanzadeh99
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Posted by hasanzadeh99: Sun. Feb 20, 2022 - 04:24 PM (Reply to #4)
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How I can connect 5V module to 3.3V MCU?

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Gold Markclawson
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Posted by clawson: Sun. Feb 20, 2022 - 04:49 PM
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This says 3.3V or 5V:

 

https://www.adafruit.com/product/4007

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grohote
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Posted by grohote: Sun. Feb 20, 2022 - 05:41 PM
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hasanzadeh99 wrote:
How I can connect 5V module to 3.3V MCU?

 

You need a level shifter between them. It can be simplified if you know schematics, for example if 5V does work "open collector".

 

As for 5V, it is easy to provide by one of cheap board, search for this:

0.9-5V To 5V DC-DC Step-Up Power Module Voltage Boost Converter Board 1.5V 1.8V 2.5V 3V 3.3V 3.7V 4.2V To 5V

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Bronze Markawneil
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Posted by awneil: Mon. Feb 21, 2022 - 12:56 AM
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hasanzadeh99 wrote:
How I can connect 5V module to 3.3V MCU?

does this "3.3V MCU" have 5V-tolerant IO pins ?

 

EDIT

 

Oh - I missed:

hasanzadeh99 wrote:
my MCU is stm32

So, as Ross said (below), why are you not asking on ST's own forum?

 

See your other thread: https://www.avrfreaks.net/commen...

 

Some pins on STM32s are 5V tolerant - see the datasheet for details.

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Last Edited: Mon. Feb 21, 2022 - 08:51 AM
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valusoft
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Posted by valusoft: Mon. Feb 21, 2022 - 01:35 AM
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hasanzadeh99 wrote:
my MCU is stm32
So why aren't you  asking your question over at their site?

Ross McKenzie, Melbourne Australia

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Jeckson
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Posted by Jeckson: Mon. Feb 21, 2022 - 07:33 AM
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What MCU module that you had ?

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Bronze Markawneil
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Posted by awneil: Mon. Feb 21, 2022 - 09:43 AM
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valusoft wrote:
why aren't you  asking your question over at their site?

Seems he now has: https://community.st.com/s/question/0D53W00001NWTmISAX/is-it-possible-to-connect-srf05-module-ultrasonic-to-stm32f030k6t6-and-work-with-33v

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  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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Bronze Markawneil
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Posted by awneil: Mon. Feb 21, 2022 - 09:53 AM
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clawson wrote:
This says 3.3V or 5V: https://www.adafruit.com/product...

But that seems to be  a slightly different module:

 

 

Which, of course, raises the question: if 3.3V operation is important, why not just pick a 3.3V module in the first place??

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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Gold Markclawson
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Posted by clawson: Mon. Feb 21, 2022 - 11:40 AM
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awneil wrote:
But that seems to be  a slightly different module:
yeah I know that. What I was suggesting is "why have a battle with 3/5 boundaries if you can buy almost exactly the same thing in a 3V ready form to start with?" Too often we seen threads here about people designing system with the "wrong" components and then having an uphill struggle to make it work. But if you design in the right components from the start you can have a smooth, carefree journey to the solution instead. 

 

(of course if you already ordered 10K pieces of the 5V one and "have to make it work" then I guess that's different but, as always, doing the upfront design work pays dividends and that includes designing in the right components in the first place).

Last Edited: Mon. Feb 21, 2022 - 11:41 AM
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Jeckson
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Posted by Jeckson: Mon. Feb 21, 2022 - 01:26 PM
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clawson wrote:

if you design in the right components from the start you can have a smooth, carefree journey to the solution instead. 

yes
awneil wrote:
Seems he now has: https://community.st.com/s/question/0D53W00001NWTmISAX/is-it-possible-to-connect-srf05-module-ultrasonic-to-stm32f030k6t6-and-work-with-33v
STM32 module had 5V and 3,3V

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Last Edited: Mon. Feb 21, 2022 - 01:31 PM
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