In the schematic above, a pulse applied to the base of the transistor allows current to flow from the +5v source to the relay arduino relay modules.
45+ Relay Module Schematic PNG. By diymechanics in circuits arduino. This relay module has two channels (those blue cubes).
4 Channel USB Solid State Relay Module - Numato Lab ... from docs.numato.com
The following schematic shows how to connect the module to an arduino, i have only shown one device. Code of relay module interfacing with microcontroller. 555 integrator with transformer relay with relay schematic circuit diagram.
By diymechanics in circuits arduino.
The following schematic shows the basic circuit. In the past, i used to build a circuit just like the above. In the schematic above, a pulse applied to the base of the transistor allows current to flow from the +5v source to the relay arduino relay modules. The arduino can be programmed to turn on the relay when a certain event occurs, for example when the temperature of a thermistor gets higher than 30°c.
