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We have seen different types of human interface devices (HID), such as mouse and keyboard. In older versions of the mouse, optical sensors were used to detect movement relative to a surface, thus they required a smooth surface to...
Ever accidentally left your room door ajar for a long period of time and found your valuables missing? Here is an intelligent solution for you. The idea is fairly simple as it mainly requires a TM1637 4-digit display and...
Monitoring of various process variables such as temperature, pressure, viscosity, humidity, pH and flow-rate is very important in steel plants, petrochemical and other such industries. The human-machine interface (HMI) at the operator station displays a continuous and real-time trending...
Air-coolers provide cool air in a room by adding moisture to the air. This moist air is blown inside the room by an exhaust fan or blower, which makes the room temperature drop. These coolers require frequent refilling of...
Infrared (IR) remote-controlled RGB bulbs available in the market are extremely expensive. Here is a simple, easy-to-build and inexpensive circuit built using Arduino Uno R3. The project demonstrates how to turn on/off or vary the colours of an RGB...
Here is a simple 10-watt audio amplifier using IC LM1875. The IC has five pins and can deliver a maximum of 18-watt output power depending upon the supply voltage and load. The author’s prototype is shown in Fig. 1. Circuit...
Many single-ended analogue signals do not have DC components or appropriate DC offsets. Due to that, these require very high input resistance for analogue-to-digital converter (ADC) inputs. This simple universal dual level shifter and buffer for AC and audio...
This circuit is used to convert DC voltages like 9V and 12V to 5V, 500mA DC, which is suitable for embedded systems. Use of a linear regulator normally found in an AC-DC adaptor is not a good idea, because it...
Here is a circuit meant for babies for generating various light patterns on eight LEDs. Lights pattern generator circuits available in the market are fitted with toys, and are used by babies for play and entertainment. These toys are...
Metal oxide semiconductor field effect transistor (MOSFET) is a semiconductor device widely used for switching applications and amplifying electronic signals. While the facility to determine the type and pin configuration of bipolar junction transistors (BJTs) are available in digital...