Hi to all,
I have a project that include GPS module and Arduino uno.
I use SIM28 as a GPS module, the problem is Arduino can not read any information from GPS (GPS module itself is working.).
Communication between Arduino and SIM28 is hardware serial RX,TX. When i measure this signal with an oscilloscope
SIM28 TX pin signal is like below;( 3V– 0V square wave)
When i applied this signal to Arduino RX pin square wave has changed to 4 V to 2.8 V.
I figured out that Arduino needs logic level converter which converts 3V to 5V so i used the circuit below:
After that, SIM28 TX signal has changed to 5V-0.6V square wave as expected.(see below)
However, when i applied this signal to arduino RX pin, signal changes to 5V-3V square wave as below, and arduino can not read that signal.
How can I communicate GPS module (SIM28) and Arduino, OR How can i convert my signal to 5V-0V, which will make it meaningful signal for my Arduino.
Thanks in advance.