This article will show you how to build your own version of the Fire-Stick infrared remote control system. The LITEON infrared receiver modules originally designed-in to the Fire-Stick have been discontinued, and forced us to re-design the original circuit boards. The principle works of the fire stick is the heart of the Fire-Stick is the Holtek H
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T-12A encoder IC. This handy little encoder was specifically designed for infrared transmission media, and internally generates the 38 KHz carrier frequency for each data transmission. The data pins of the HT-12A act as both data input pins & transmit enable inputs. Unlike most ordinary encoder ICs with separate transmit enable pins, and data input pins, the HT-12A uses the data input pins to take care of both input functions. By pulling one of the data pins to ground, the transmission cycle is started. As with most encoders, a pre-determined sequence of events takes place during each separate transmission cycle. The HT-12A however, has a few internal extras that make it pretty flexible. Notice from the flow chart below that the logic state of the L/MB pin is checked prior to finishing the transmission cycle and returning to standby mode. The L/MB pin serves as the Latch/Momentary selection pin, and determines whether the HT-12A will end each transmission cycle by sending the exact logic state present on each data pin, or end the transmission cycle by sending logic "1" 7 times as the data. If L/MB is left floating, (not connected), the transmission will send only the actual logic values present on each of the HT-12A data input pins. This logic value will be latched onto the output pins of the HT-12D decoder IC until you send another transmission with different data. The HT-12D decoder IC used on the Fire-Stick receiver...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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