gps tracker, wmo2, no communication

[amml2000]

Hi Mike

I am one step closer/ further away again.

I realized I had my AME8811 the wrong way around, so i fixed that, and now I have the same problem again! So now I know why I had the problem in the first place, what a coincidence.

If I bridge the AME8811 and have the attiny run at 5.5 volts, it works, however, if i run the attiny at 2.29 volts, it does not. So maybe I should run the mcu at 5.5 volts and have it take the power before the ame8811? how high can the mcu go voltagewise?

Cheers

[amml2000]

hm, really dont know why it works if i bypass the ame8811, but i cant really do that as i will connect a 7.4 volt battery in the end... Any Ideas why i have this problem? I just dont understand....

Could it be because i programmed the attiny at 5.5 volts, it isnt working correctly at 3.3 volts?

Cheers

[amml2000]

yep that was it, programmed athe mcu at 3.3 volts and it worked just fine.. so much trouble lol. Finally got it working hehe. May i ask why this is the case? is there any resource on the net that explains this to me? cheers

[Mike]

That should not be the case. It should not matter what voltage you programmed it at.
If you have a stable 3.3 volts to the MCU, it should work.
5.5 volts is the maximum safe voltage for the MCU.

Mike