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5V 4-CH Extension Relay Module Shield for Arduino (Works with official Arduino Boards) - Deep Blue
As a general electronic module with large power equipment under control of a small current signal£¬ Relay Shield (5V 4 Relay Shield) can ensure the single chip to control large power devices and is widely used in intelligent household projects made by single-chip microcomputer system; moreover£¬ it can directly be inserted to varieties of main boards compatible with Arduino without connecting the flat cable. See below features of the module: 4 relay shield standard Arduino shield interface and shape; other Arduino extension board is available; three M3 positioning screw holes£¬ convenient for installation; high level driver (5V or 3.3V); normally open contact closure; with onborad relay work indicator light(red). Special attention: when it is connected by Arduino UNO main board£¬ the green terminal should be avoided from short circuit by its shell. Parameters: Voltage Min. 4.75V;Typical 5V; Max. 5.5V;Power consumption (@5V) 180 mA; On and off times per minute is 30; Max. switching voltage per way is 125 VAC / 24 VDC; Max. switching current is 3A; relay: sky wave 5V direct-current relay with model HJR-4102-L-5V£¬among which£¬ Relay 1 represents No. 1 relay and so on. Control interface: totally four pins£¬ with the four control signal pins sequent£¬ pull-down resistor comes with the circuit and the high voltage level can drive the corresponding relay (x) to absorb the armature so as to connect NOx and COMx; power interface: 5V direct power supply interface. Indicator light: four red indicator light and the corresponding indicator light will be on when the relay is driven by high voltage level. Relay terminal: connection terminal with large power can connect equipment with large current and voltage. No. 1 pin (NOx) is a normally open pin£¬ NCx is a usually closed pin and COMx is a common terminal£¬ i.e.£¬ if the relay is not driven£¬ NOX and COMx will open and NCx and COMx will connect; when the relay (x) control signal pin is in high level£¬NOx and COMx will connect and MCx and COMx will open. Pin resources that occupy the main control board compatible with Arduino / Catduino: four data pin in total. D4: control Relay 4; D5: control Relay 3; D6: control Realy 2; D7: control relay 1; therefore£¬ the other Arduino shields that will not occupy the four pins can directly be inserted to the extension board£¬ i.e.£¬ they can use the two extension board at the same time.