
If you got the module in an absolutely bad space, pull this pin LOW for 100ms to perform a hard reset. It doesn’t even run on 3.3 V! Use a Li-Po battery or a DC-DC buck converter instead. Keep in mind that the SIM800L chip has an operating voltage range of 3.4 V to 4.4 V, so connecting this module to the Arduino’s 5V output is probably going to cause damage to the module.


Digital pin 6: # 4 DC Motor/Stepper # 2 (activation/speed).Digital pin 5: DC Motor # 3/# 2 Stepper (activation/speed).Digital pin 3: # 2 DC Motor/Stepper # 1 (on/speed).Digital Pin 11: Motor # 1 DC/Stepper # 1 (on/speed).The Motor Shield uses the H-bridge L293D and 74HC595N integrated circuit. Prerequisite : Programming with Arduino, Control a DC Motor with Arduino, Control a stepper with Arduino A new version of this shield exists, the Motor Shield V2. The Shield used in this tutorial is the Motor Shield V1 from Adafruit. Shields exist for this purpose, to simplify programming and installation.

In an embedded application, such as a Rovy robot, you will have to control several motors in parallel. We have seen how to control a DC motor using H bridge which may require a lot of connections when using the simple integrated circuit. The Motor Shield V1 is an expansion board for Arduino UNO and Mega microcontrollers for DC and stepper motor control.
