Have a V1.3.2 board ATU-10. Made it to first step, programmed the two chips and can cycle thru the screen. The A06604 were installed, (along with the associated caps) ?but no relays. J4 on or off did not matter. No batteries were installed either.

Then I installed the relays...

On boot I get ?standard screen and then the battery level goes to zero and it shuts down with the "Low Batt" error message. This also happens when I install the relay test. The Battery jumpered seemed to delay the shutdown where as the J4 jumpier seemed to make the shutdown happen sooner (remember not batteries installed).

Checked the power pins on the PIC16F1887 (Vdd(7), Volts(9), and Vdd (28), all were 4.0x volts. ?Plugged in an inline USB V/Current meter. 4V in, .021A, until shutdown where current drops to minimus, volts still the same. Use a wall wart too, no difference.

Funny thing, thought I must have a short in the relay section, but this low batt error message happens whether or not J4 is jumpered.?
When is this error message generated? Or perhaps (hopefully) I have jumped the gun here and I really need the batteries connected and/or inductors installed?

73
Mark
AJ6Cu

开云体育

Mark

I don't know exactly why you have a problem but I have tested 4 boards I built without batteries and no issues.?? The output of the TP4056 from what I recall was usually about 4.1- 4.2v

Low battery would seem to indicate you may have a problem with the voltage divider that feeds the ~4.1v into the ADC of the PIC.?? Check the value of the divider resistors (220k & 22k ) with the Net on my Sch marked "VOLTS" and of course for a short at that point 1st perhaps.

Glenn

Glen,

Thanks for the advice. Just did the obvious re-flow of the 220k and 22k, but wasn't lucky. ? Will trace that net more closely in the morning.

So the input on the Volts pin into the 16F18877 should be between 0-0.4V? Will have to measure again in the morning, but I thought I saw 4Vs in (but maybe missed a decimal point ;-)...

73
Mark
AJ6CU

Hi,Mark.
Install batteries.

@David F, ?Thanks for the suggestion. I charged the batteries to 4.2 each and gave it a try. No love.

@Glen, back to you voltage divider suggestion. Seeing 4.2v into the 220k, and 0.378v on the Volts net (between the 220k and 22k). This is pretty close to the theoretical of 0.389... ?Checked the Vdd (BATT) on the 16F18877 and it is 4.2 in.

This all happened after I installed the relays and tried to use the relay test firmware. Some of the relays appear to be "on" at this point. j4 on/off doesn't seem to matter. Any chance I burned out the pin that is looking at the voltage divider on the 16F18877?

73
Mark
AJ6Cu

Problem solved!

Re-heated the 1-11 pin side of the PIC16T18877 and all working now. Must have been a bad connection at pin 9 (Volts) (or short to 8 or 10.

73
Mark
AJ6CU

开云体育