Why MIDI needs an optocoupler at all A MIDI cable carries a current loop, not a voltage. The transmitter switches 5 mA through the two signal wires, and the receiver turns that current back into a logic signal. The isolating part matters: two pieces of audio equipment plugged into different mains circuits can sit at […]
Projects
NE555 Voltage-to-Frequency Converter: How It Works and How to Build One
What this circuit does A 555 timer can turn a slowly changing analog voltage into a stream of pulses whose frequency rises and falls with that voltage. The output is a square wave, so it can be sent down a long cable, counted by a microcontroller, or fed into a frequency counter, without the voltage […]
WorkSafe CV based multiparameter monitoring and diagnostics
Worksafe is an attempt to bring advanced healthcare diagnostics to residential and industrial markets at affordable costs. Description As we all are aware, it’s been almost two years since the SARS-COV2 outbreak began in December, 2019. Initially, it put tremendous pressure on all countries to find out methods for identifying the infection. The most prominent […]
Zigbee Wireless Relay Control and Power Monitoring System
Introduction We designed a system for wirelessly controlling relays and monitoring current. This is used for a home load simulation. By wirelessly turning relays on and off by sending commands from a PC to a microcontroller we can change the total load (current) to our simulated home. For wireless communication, we used XBee Series 2 […]
Zoned Climate Control with MediaTek’s LinkIt™ Smart 7688
Hardware components: MediaTek Labs The MediaTek LinkIt™ Smart 7688 platform × 1 Everything ESP ESP8266 ESP-01 × 1 Arduino Nano R3 × 1 Atmel ATTiny85 × 1 DHT22 Temperature Sensor × 1 Servo (generic) × 1 Software apps and online services: Arduino IDE STORY Winter is coming When my wife and I had our first child […]
Wiring of the Solenoid Valves
Overview of Wiring for the Salinity Sensor Other pages describing fish tank wiring: Connect electrical power to the pump and the breadboard Connect the salinity sensor to the breadboard and Arduino Connect the solenoids to the cascade control circuit (this page) Return to the main page for the fish tank wiring. Schematic The following […]
Wiring Harness for the LCD Panel
Assembly of the Female Connector Block The wiring harness has a male and female end. The gender of electrical and mechanical parts is described on this Wikipedia page. The header pins that are soldered into the circuit board for the LCD panel are plugged into the female end of the wiring harness. This web page […]
UVic Quadcopter using arduino
Hardware Controller The Arduino platform is selected for this project, mainly due to its open software and hardware nature which has resulted in availability of extensive technical information. As a result there are many tutorials and example project available for this platform. A list of arduino boards can be found here. Many of these boards […]
Voice Recognition System using arduino
Contents 1 Team Members 2 Mentor 3 Concept 4 Softwares Used 5 circuits 5.1 Pre Amp circuit 5.1.1 Circuit Diagram 5.1.2 Working 5.2 EEPROM circuit 5.3 Led Matrix display circuit 6 Algorithm for silence & noise removal 6.1 Pre-Emphasis 6.2 Silence and Noise Removal 6.2.1 Idea 6.2.2 Implementation 7 Codebook Formation 7.1 Database 7.2 Main […]
Using Push Button Switch with Arduino Uno
In this tutorial you will learn how to read the status of a digital pin of Arduino. I hope that you already go through our first tutorial, Getting Started with Arduino Uno – LED Blinking. In this example, a push button switch and an LED is connected to Arduino Uno. When we press the switch, LED will glow for […]