Arduino Uno With Optocoupler Relay is a board based on ATmega328p which is an 8-bit microcontroller from ATMEL. The main purpose of building this board is to use it in COVID-19 and similar kinds of ...

Arduino Relay Driver Shield Circuit Diagram: In this 3-Channel Relay Driver Circuit, we have used an optocoupler to trigger the NPN transistor which further drives the relay. And optocoupler will be ...

Arduino Uno With Optocoupler Relay is a board based on ATmega328p which is an 8-bit microcontroller from ATMEL. The main purpose of building this board is to use it in COVID-19 and similar kinds of ...

So in this DIY project, we make a 4-Channel Relay Driver Circuit to be used in relay based applications. In-here we have designed an isolated PCB for 4 relays to operate 4 AC appliances at a time. We ...

Recommended optocouplers. Note that the optocouplers must have a CTR (current transfer ratio) greater than 100% or else the circuit cannot latch. The 4N37 has a minimum CTR of 100% and maximum of 200% ...

Water Pump Controller Circuit . The circuit diagram of the multi-house water pump control system, shown in Fig. 2, is based on an Arduino Nano board (MOD1), four PC817 optocouplers (IC1 through IC4), ...

It works in two different modes, Normally Open (NO) and Normally Closed (NC). in our project, we will use it in Normally Open mode which means when the relay is switched off the circuit will be broken ...

Overvoltage Protection Circuit Diagram. The circuit’s dual power supply using transformer X1 and diodes D1 through D4 isolates the supply between relay RL1 and control circuitry with the help of ...