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This project is a IoT based data logger system that displays temperature and humidity on ThingSpeak.com using WeMos D1 R2 board. You can add more data to the project—up to eight data per channel. WeMos board WeMos D1 R2 board looks...
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...
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...
This simple telephone caller identification display can be very useful for bikers. While riding a bike or any two-wheeler, the cellphone is usually kept in a pocket. When you receive a phone call on your cellphone, you do not...
Here, RGB LED light intensity and colour change with the rhythm and volume of music. It is a great idea to have such a lighting system at home, gym or music school. This circuit is based on ATmega8A microcontroller...
Presented here is a triac-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...