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In the previous tutorial, the Constant Current (CC) Source of 60 mA and Constant Voltage (CV) Source of 4.2 V were designed using LM317 voltage regulator IC. The constant current source is to be used for constant current mode of the battery charging while the constant voltage source is to be used for constant voltage mode of the battery charging. During the designing of constant current source and the constant voltage source, testing a Li-ion battery before charging it was also discussed. Check out the previous tutorial “Basics of Li-ion battery charging” for learning about the basics of Lithium ion batteries, their charging methods and topologies.

XBee – Capacitive touch controlled robot receiver Circuit setupRobotic cars are commonly used for outdoor operations. These are designed for different purposes and applications. These robotic vehicles are meant to move over a surface and reach a spot to carry out the intended application or perform specific tasks. The robotic cars can be controlled with a remote control which may be connected to the robot either through a wired connection or a wireless interface. The wireless connectivity is usually provided by Wi-Fi, Bluetooth, RF or mobile networks. One of the RF technologies available for providing wireless connection is Zigbee. 
Battery linear charger real time circuit arrangementIn the previous tutorial, the basics of Lithium ion batteries were discussed. Also, it was discussed how it is important to handle these batteries with care. as mentioned in the previous tutorial, that Lithium ion batteries need to be charged using CC-CV method, in this tutorial, a Li-ion battery charger for a single-cell Li-ion battery of nominal voltage 3.7 V will be designed. 
There are charger modules available in the market which can be used to charge the Li-ion batteries. In this tutorial, a charger built using the basic electronic components including Linear Regulator will be designed from scratch. The charger circuit will be customized as per the battery specifications and the charging requirements.