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Generally, the total number of appliances that can be controlled without using a microcontroller (MCU) is limited to three or four. One possible solution to this limitation is described in this project. Using this circuit, you can control up...
The circuit presented here can be used to drive USB-powered smart devices, including smartphones, while riding a bicycle. Smartphones suck battery power extremely fast, particularly when GPS and data connectivity are in constant use, and display and backlight are...
This circuit breaker employs a single operational amplifier (op-amp) and yet has a wide range and is user-friendly. A circuit breaker is an electrical switch intended to protect an electrical circuit or device from damage caused by excess current...
Here is a circuit for automatic plants watering, which can be undertaken every morning without any human effort. A sensor is used to detect ambient light and activate a pump motor to start watering the plants in the morning....
This article highlights common errors in 8-bit instruction sets, and introduces a novel architecture for decimal conversion instructions, especially in 8051, 8086, 8085 and PIC microcontrollers (MCUs). Statistical analysis of different methodologies has revealed that decimal conversion instructions in...
This article presents a simple, low-cost stereo headphones buffer using two LM358 operational amplifiers (op-amps). It is used to connect the headphones to line outputs capable of driving loads up to 600-ohm. The circuit has a high input impedance, low...
Presented here is a submersible pump starter circuit using electronic overload relay, solid-state relay and adjustable startup delay. A submersible pump is a type of centrifugal pump designed to function with the pump and the motor completely submerged in the...
A white cane is used by the blind or the visually-impaired to scan the surroundings for obstacles and orientation marks, and find the correct path. The visually-impaired using a white cane still need a sighted guide when they need...
Presented here is a loop-based anti-theft alarm circuit using a simple wire loop as sensor. It can be used to protect any device against theft, or as a door opening alarm. Make sure that when the device moves, or...
Described here is an easy-to-use circuit of an automatic infrared (IR) faucet controller suitable for hand hygiene and water conservation at homes, hospitals and offices. With this compact controller you can turn on and off a faucet automatically, preventing...