GrinderFX
Newbie level 3
Hi.
I used before already the sim900 and it worked fine.
So I used nearly the same circuit for the sim908 but the netlight is on all the time and nothing happens.
I checked already the powersupply and the ground and everything is fine. I get even an output from 0.35 Volt on the sim908 netlight output pin, but it never changes.
Vbat and vbat2 have both 4.2 Volt.
Even changes on the pwrkey have no effect.
I fixed already the missing GND on GND9 and GND13.
I soldered it by myself, maybe I damaged the chip?
I used before already the sim900 and it worked fine.
So I used nearly the same circuit for the sim908 but the netlight is on all the time and nothing happens.
I checked already the powersupply and the ground and everything is fine. I get even an output from 0.35 Volt on the sim908 netlight output pin, but it never changes.
Vbat and vbat2 have both 4.2 Volt.
Even changes on the pwrkey have no effect.
I fixed already the missing GND on GND9 and GND13.
I soldered it by myself, maybe I damaged the chip?