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This wireless LCD display shows information sent from a smartphone. The user can send text messages with up to 32 alphanumeric characters to the LCD within Bluetooth range of about 10 metres. This project can be extended and implemented in...
Introduction GNSS – GG-1802 ($5 a piece) Sometimes things do not fall in place and we curse ourselves for taking the wrong turn or making the wrong choices. But in P B Shelly's word the real perspective later for those situations...
This article describes the implementation of a digital frequency meter using Arduino Uno to determine the sinusoidal frequency signal in the range of 20Hz to 5kHz. The logic involves counting the total number of pulses per second that appear...
This circuit can be used to control up to four electrical devices through a cellphone or computer. The main advantage is that you can login from anywhere to control the device(s). If you try to login using invalid credentials...
We have heard of events/parties going out of control due to gate crashing by uninvited guests. Now, as a solution, imagine your door counting the number of invitees and raising an alarm when the number exceeds the guest list....
The accidental pressing of the on/off switch due to human error may cause the failure of the system it is connected to, or cause unnecessary delay to a part of the parent circuit. This could, in turn, cost money...
This timer switch for an electric water heater is based on NodeMCU and Blynk IoT cloud solution. An electric water heater is used in bathrooms during the cold season for bathing with hot water. A common problem is that...
This Multi-Utility Protection System project is used for fire detection and then sending an SMS alert to a cellphone. The design is based on Arduino Uno. The project also includes an LCD and an LED for visual indications, and...
This LED Night Lamp uses a 1.5W LED module operated on a 12V DC power supply. Here, an L14F1 phototransistor works as a sensor. When there is sufficient light falling on the sensor, LED remains off; but when there...
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...