Ethernet shield with external power - only 4.2 V at 5 V pin

End-Of-Life Products & Services Tech support before 2012
#1

Hi,

I have a Stalker V1 and a Ethernet shield from Seeed. When I power all from USB everything its ok, but if I use an external power supply with 9 V I get only 4.2 V on the 5 V pin on the ethernet shield. That’s really strange for me. Also I recognized that the RTC does not work under these condition. :frowning:

Any idea what is here the problem?

Best regards,
Christian

#2

Sorry for the inconvenience brought. We will have a test and get back to you.

#3

The JST power on the Stalker supports lithium battery but not the DC Adapter. Did you used the external power through the JST power connector?

#4

Does your 9V adaptor can supply more than 500mA?

#5

Yes I do so. Because I though this is the right way. Where a should I correctly connect the power to power also the Ethernet Shield?

#6

Try short the D6(JST side) diode, and test with the ethernet shield.

#7

I tested the same with an Arduino UNO and got the same problem with only 4.2 V on the 5 V pin.
So maybe it is a problem with my Ethernet shield?