Jump to content
Search In
  • More options...
Find results that contain...
Find results in...
Jenko32

Connecting Sonoff BASICR2 (WiFi relay) to 5V standby

It will probably be fine. I can't think of any real reason why max peaks of 150mA would be sufficient to cause harm especially if you're allowed to pull ~500mA when charging a device from USB even when the systems off.

Recommended Posts

Posted · Original PosterOP

(Not sure if this belongs in "Hobby Electronics" or "Cases and Power Supplies")

I realized I wrote to much useless information so here's just the question. Is there a problem with powering on something to the 5V standby rail? The device is going to pull constant ~70mA and ~150mA when switched on to trigger a Wake On LAN

 

I've put this Sonoff BASICR2 WiFi inside my PC to create my own Wake On LAN/WAN device to save myself from the motherboard's problems with Wake On LAN (I choose this method even before discovering my motherboard didn't have this option). The device is connected to the USB internal header cause I thought it was always powered since I activated the BIOS option of having USB power always on.

And this is the problem. The USB don't get power when the power is on for the first time (example: connecting power supply cord or switching on the power strip from completely de-powered PC)

20200814_221447.jpg

Link to post
Share on other sites

Have you thought of using a 5V wall charger?

 

The problem I see with your idea is it may cause the system to be forced on as you would normally short the standby pin to ground to power on the unit. If it's not a direct short to ground then pulling enough mA might trip the PSU on unplanned.

 

 


Guides & Tutorials:

How To: Access Remote Systems at Home/Work Securely from Anywhere with Pritunl

How to Format Storage Devices in Windows 10

A How-To: Drive Sharing in Windows 10

VFIO GPU Pass-though w/ Looking Glass KVM on Ubuntu 19.04

A How-To Guide: Building a Rudimentary Disk Enclosure

Three Methods to Resetting a Windows Login Password

A Beginners Guide to Debian CLI Based File Servers

A Beginners Guide to PROXMOX

 

Guide/Tutorial in Progress:

How To: Remotely Access Your Server/NAS

 

In the Queue:

How to Use Memtest86 to Diagnose RAM Errors

 

Don't see what you need? Check the Full List or *PM me, if I haven't made it I'll add it to the list.

*NOTE: I'll only add it to the list if the request is something I know I can do.

Link to post
Share on other sites
Posted · Original PosterOP
5 minutes ago, Windows7ge said:

Have you thought of using a 5V wall charger?

 

The problem I see with your idea is it may cause the system to be forced on as you would normally short the standby pin to ground to power on the unit. If it's not a direct short to ground then pulling enough mA might trip the PSU on unplanned.

 

 

When the 24 pin connector is inserted on the motherboard 5V is present between ground and the 5v standby pin (checked with a multimeter). I might just try and see what happens, trusting that the PSU manufacturer doesn't have mechanisms in place that exclude more than a few mA to go into the motherboard when the PC is shut down

Theoretically my PSU has 2.5A max output on the 5vsb rail. I don't understand where one would need to use 12.5W from that

Link to post
Share on other sites
Posted · Best Answer

It will probably be fine. I can't think of any real reason why max peaks of 150mA would be sufficient to cause harm especially if you're allowed to pull ~500mA when charging a device from USB even when the systems off.


Guides & Tutorials:

How To: Access Remote Systems at Home/Work Securely from Anywhere with Pritunl

How to Format Storage Devices in Windows 10

A How-To: Drive Sharing in Windows 10

VFIO GPU Pass-though w/ Looking Glass KVM on Ubuntu 19.04

A How-To Guide: Building a Rudimentary Disk Enclosure

Three Methods to Resetting a Windows Login Password

A Beginners Guide to Debian CLI Based File Servers

A Beginners Guide to PROXMOX

 

Guide/Tutorial in Progress:

How To: Remotely Access Your Server/NAS

 

In the Queue:

How to Use Memtest86 to Diagnose RAM Errors

 

Don't see what you need? Check the Full List or *PM me, if I haven't made it I'll add it to the list.

*NOTE: I'll only add it to the list if the request is something I know I can do.

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


×