Real-time clock (RTC) integrated circuits (ICs) are used for reasonably accurate time displays. The accuracy of RTCs mostly depends on the crystal. In a long run, a small-time deviation will be observed in the RTC circuit due to seasonal and atmospheric temperature changes. In case of a Global Positioning System (GPS) clock, the time/time stamp is received from the satellite(s) and is highly accurate. This project is based on a low-cost GPS clock using AVR ATmega8A microcontroller (MCU). Circuit and working of Low-Cost GPS Clock Circuit diagram of the simple and low-cost GPS clock is shown in Fig. 1. It is built around ATmega8A (IC1), NEO 6M GPS receiver module (GPS1) along with an antenna, 16×1 LCD (LCD1) and a few other components. Fig. 1: Circuit diagram of GPS clock NEO 6M GPS receiver module receives National Marine Electronics Association (NMEA) data continuously and transfers the same to ATmega8A MCU. The MCU processes the data and picks the date stamp from the received data str...

Someone anonymous left me a comment in this post asking that, since I had analyzed the transmitter, I also described the receiver. The comment I deleted, for the lack of care of its editor, but the request seemed right. A typical receiver of a cheap car made in China does not have much crumb. This I present is one that cost me between 3 and 4 euros (for those who are more familiar, about 4.5 USD). Current Radio Control circuits   There are three types of low-end radio controlled cars. Of course they do not have to be cars, the external form can be any. What matters is the circuit. Of course we talk about radio control at 27MHz, there are other controls that work with infrared but I will not talk about that.   As I say, in RC models today we find only three types of circuits. Because the manufacturers are the same and barely change the schemes. The scheme depends on the channels that the car has. Channels are the independent actions you can perform.   Diagram of a channel:...