RPi Python Programming 21: The SIM900A AT commands

RPi Python Programming 20: Interfacing the SIM900A GSM-GPRS modem and hacking earphones

RPi Python Programming 19: Serial UART communication on RPi’s TTL port

A Bluetooth-controlled datalogger robot

RPi Python Programming 18 – Serial UART communication on Raspberry Pi’s TTL port

GSMA Embedded SIM for Internet of Things 01

RPi Python Programming 17: Serial communication using UART protocol

RPi Python Programming 16: Analog output and software PWM

RPi Python Programming 15: Interfacing a push button & digital input