Mutchus

Generally for connecting an LCD display to an Arduino using 7 strands, it usually breaks the leg that has any projects that remain few ports to be used. But there is a way, using an IC 74LS164 (8-bit serial shift register), a resistor and a diode, but it's not just hardware, you have to use a library. This Arduino library for connection of 2-wire or 3-wire using HD44780 compatible LCD display via shiftregisters. This circuit is considered "deprecated", but it's worth testing. LCD Display on the Arduino Circuit 

Experts a nd amateurs have been Experimenting with radios without batteries since the wireless communication started. In many designs we've seen radios that operate without power, but all are known to use the diode 1N34. (Crystal Radio). Although significant improvements have increased the sensitivity and selectivity of these system circuits, Performances were limited until new techniques have emerged.    Here we have the first transistor radio that works without batteries, it is powered by random electric fields are everywhere in the atmosphere.  These circuits are relatively cheap to manufacture, have more volume and better reception from the crystal radios.   This circuit is a medium wave receiver and attaches easily to frequencies from 500Khz to 11Mhz. To get good results in the reception of radio stations, we should give great importance to the ground and the antenna. To listen to distant and weak stations we have to use a battery 9volt parallel with the capaci...