This is a very simple timer circuit. When you push down to turn on the S1, this will turn on the LED and it also will charge the C1 Capacitor. Then upon releasing the push button switch, the LED will stay lit for couple of seconds until C1 is completely discharged.

The analog car design is a self-running electric car that avoids obstacle in the left-right region. The design is mainly supported with 5 circuit components. The 9 V to 5 V converted for voltage-current manipulations. The push-button delay circuit (kill switch) for users to temporarily be able to stop the car motors benefiting from RC circuit, MOSFET transistors, and 74HC14 Hex Schmitt Trigger Inverters. The motor speed controller using potentiometers, inverters, and generic diodes. As well as the HC-SR04 Ultrasonic Sensor circuit to sense the proximity of objects in a field of view.

The 555 timer IC is an integrated circuit used in a variety of timer, delay, pulse generation, and oscillator applications.

The 555 timer IC is an integrated circuit used in a variety of timer, delay, pulse generation, and oscillator applications.

The HY2213 series, developed and manufactured by HYCON Technology Corp., presents a high-precision, energy-efficient battery charge balance integrated circuit (IC) specifically designed for single-cell lithium-ion or lithium-polymer batteries. This component encompasses a wide range of features tailored for multi-cell Li-ion rechargeable battery packs applications, including a high-precision voltage detection circuit capable of monitoring overcharge situations with a detection voltage range between 4.000V and 4.500V. Its unique design allows for delay times generated internally, eliminating the need for external capacitors and reducing the overall component count. Operating with a remarkably low consumption current in both operation (Typ. value 2.5uA, Max. value 3.5uA at VDD=3.9V) and standby modes (Max. value 0.5uA at VDD=2.7V), the HY2213 series is designed for energy-sensitive applications. It also offers versatility in operation temperature, ranging from -40℃ to +85℃, and comes in a compact SOT-23-6 package, making it suitable for space-constrained applications. The HY2213 series underscores HYCON Technology Corp.'s commitment to advancing battery management solutions by integrating overcharge detection and release, standby detection, and charge balance functionality into a single, efficient, and easy-to-use IC.