WISMO218: AT initial sequence?


#1

I have problem with wismo 218. It have worked for a short period of time, and only for a few seconds it responded to at+creg=? with 0,1… All other time it’s 0,3%; 0,4%…

Also, after XX number of seconds it would stop responding on AT commands…

What is the usual init sequence for wismo? I use 3 wire UART connection (just GND, TX and RX) on 115200bps…

Thank you…


#2

Maybe it enters in the sleep mode. There is a reference scheme for connecting wismo without DTR control. Try to reproduce it.


#3

Check your filter cap. If your power supply is not sufficient, the WISMO218 will shut down when it attempts to transmit (a few seconds after power on).
Mick.