OpenMV pins current

General discussion about topics related to OpenMV.
joao-pinto94
Posts: 3
Joined: Tue Dec 03, 2019 11:54 am

OpenMV pins current

Postby joao-pinto94 » Tue Dec 03, 2019 11:59 am

Hello everyone,
im staring with OpenMV, Im looking to implement 4x LASER on board with 4.8V and 120mW.
I couldnt found information about pins, can i connect the LASERs directly on board or need some extra power/battery to implement?
I pretend to start the LASERs with GPIO and take a shot of the points with camera module.

With the best regards,
User avatar
kwagyeman
Posts: 3503
Joined: Sun May 24, 2015 2:10 pm

Re: OpenMV pins current

Postby kwagyeman » Tue Dec 03, 2019 2:51 pm

I don't think you can power the laser didoes with the gpios. You should use the OpenMV Cam to switch the I/O pins.
Nyamekye,
User avatar
iabdalkader
Posts: 1026
Joined: Sun May 24, 2015 3:53 pm

Re: OpenMV pins current

Postby iabdalkader » Tue Dec 03, 2019 2:52 pm

Hi we have a datasheet with this info, you can draw about 20mA from each I/O pin and 140mA in total (meaning the sum of all the current drawn from I/Os not a single I/O), also please see the STM32H7 datasheet.
joao-pinto94
Posts: 3
Joined: Tue Dec 03, 2019 11:54 am

Re: OpenMV pins current

Postby joao-pinto94 » Wed Dec 04, 2019 11:54 am

Thanks you for help.
Can i use some circuit like in figure to on off LASER with GPIO pin and source voltage from 5 V pin of OpenMV?
I pretend to use only usb source to power all components, its possible?
Im using OpenMV cam H7 with camera module.
Thank you friends,

https://ibb.co/rFHYsK6


With the best regards,
User avatar
kwagyeman
Posts: 3503
Joined: Sun May 24, 2015 2:10 pm

Re: OpenMV pins current

Postby kwagyeman » Wed Dec 04, 2019 4:47 pm

Yes, you want to do what you said... but, the OpenMV Cam can't be the voltage source. You need to get 5V from something else. The camera doesn't have a VOUT, only a VIN. The 3.3V can be used for power but shouldn't be loaded down by a high load.
Nyamekye,
joao-pinto94
Posts: 3
Joined: Tue Dec 03, 2019 11:54 am

Re: OpenMV pins current

Postby joao-pinto94 » Thu Dec 05, 2019 9:42 am

Hello everyone,

Thanks for the help.

With the best regards,

Return to “General Topics”

Who is online

Users browsing this forum: No registered users and 2 guests