Oct 8, 2013 #1 M mina_a Newbie level 4 Joined Aug 14, 2013 Messages 6 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 39 hi friends; I want to interface SIM900 module with stm32 micro controller using USART interface. Is it possible to connect rx and tx pins directly, or should i use a voltage level converter circuit? thanks for your help.
hi friends; I want to interface SIM900 module with stm32 micro controller using USART interface. Is it possible to connect rx and tx pins directly, or should i use a voltage level converter circuit? thanks for your help.
Oct 8, 2013 #2 jayanth.devarayanadurga Banned Joined Dec 4, 2012 Messages 4,280 Helped 822 Reputation 1,654 Reaction score 791 Trophy points 1,393 Location Bangalore, India Activity points 0 If the voltage levels of SIM900 and STM32 doesn't match then you need to use bi-directional level translator.
If the voltage levels of SIM900 and STM32 doesn't match then you need to use bi-directional level translator.