Minty-boost USB connector pins 2 and 3 dead Moderators: adafruit_support_bill, adafruit

[rccpilot]

My Minty-boost lives! Complete and charging and old phone.
Thanks for the help and patience with a newbie.
Ray

[adafruit_support_bill]

Congratulations!

[clarkj]

Hi Ray!

FWIW, analog meters (i.e., most ones with a needle to indicate the reading) have relatively low "impedance" -- that is, they can load down the circuit that you're trying to measure. Fortunately, digital meters tend to have a much higher impedance. If you're located in the continental U.S., find out of there's a Harbor Freight Tools near you. Watch their ads -- you can often see coupons to get a basic Digital Multi Meter for free with any purchase (sometimes even with no purchase). It's not a great meter, but hey, the price is right, and in my experience, they're good enough for about 95% of the hobbyist uses.

Clark

[kucher]

I too have pins 2 and 3 (to pin 4) almost dead. Only getting 0.09 volts from 2 to 4 and 3 to 4 of the USB pads. I am getting 4.98v across pines 1 and 4. Using fully charged Eneloops producing 2.7v (in two pack) or 5.5v (in 4 pack).

[adafruit_support_bill]

@kucher -

I am getting 4.98v across pines 1 and 4

So the boost circuit is working correctly. If the voltage on pins 2 and 3 is not correct, it is a problem with how you have installed the resistors. Measure the voltage drop across each of the 4 resistors: R1, R2, R3 and R4.

[kucher]

hello,

thank you for the quick reply. Please excuse my tardy response.
Here are the readings.

I hope I am doing them correctly:

From + to R1 0.03v 2.75v
R2 0.03v 2.23v
R3 0.03v 2.75
R4 0.03v 2.23v

From - to R1 0.09v 0.0
R2 0.09v 4.99v
R3 0.09v 4.98v
R4 009v 4.98

Thank you for looking into this.

[adafruit_support_bill]

That sounds half right - but the other half sounds impossible.

For each resistor, measure the voltage between the two ends of the resistor..