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Principle
When the signal port is at low level, the signal light will light up and the optocoupler 817c (it transforms electrical signals by light and can isolate input and output electrical signals) will conduct, and then the transistor will conduct, the relay coil will be electrified, and the normally open contact of the relay will be closed. When the signal port is at high level, the normally closed contact of the relay will be closed. So you can connect and disconnect the load by controlling the level of the control signal port.
Klendark
Reviewed in the United States on January 6, 2025
Easy to connect and get working
anthony
Reviewed in the United States on January 2, 2025
Great choice. Works well
LinoBP
Reviewed in Spain on September 19, 2024
Llegada en el tiempo estimado. Producto nuevo , todo correcto.
Customer
Reviewed in the United States on August 9, 2024
If you are new to these devices no setup information is provided. Good value for the $.
Doc
Reviewed in the United States on December 2, 2024
Works as advertised but this is a replacement. The first one died after 3 years
Jesse P
Reviewed in the United States on October 19, 2024
I have it attached to a raspberry pi zero and it is working really well to control two different garage doors with a small python flask server running on the pi.
theodore LINDLEY
Reviewed in the United States on April 23, 2024
Using this board to cycle a AC motor, low duty cycle but over a 13 hour period. No fails or lag, have had ones similar fail in a day or two. 13 hours for 2 weeks still going strong.
Benjamin Kleber
Reviewed in the United States on November 3, 2023
This is a good relay board, easy to use and does precisely what I wanted it to do. Wired it to an Arduino that I had assigned relay controls to the relevant pins, was able to correctly control all 4 relays as desired.I misinterpreted the drawings at first and thought that if the three contacts on each relay are A/B/C, that A/B were connected with no power, and A/C were connected when the relay was powered. Well it turns out I'm a dork, A/B are connected with no power and B/C are connected when the relay is powered. Once I figured that out, making everything work was super simple.Small bank of LED indicates when each of the 4 relays is powered, since you can hear the clicking but it's nice to have visual feedback about which relay/s made the noise. Good relay shield.
Product niet goed geleverd
Reviewed in Belgium on October 27, 2023
Toestel is al beschadigd: gebogen en gekrast. Lijkt wel al eens gebruikt geweest.
AlessioD
Reviewed in Italy on April 27, 2019
Il prodotto è perfetto. Il modulo permetto di utilizzare la comune rete casalinga in tutta sicurezza per arduino o raspberry grazie ai fotoaccoppiatori posti all'estremità di ogni relé. Ci sono video su internet che descrivono con facilità cone effettuare i collegamenti senza correre rischi.Prima di usarli tuttavia consiglio di informarsi bene sulla simbologia legata ai relé, in particolare la definizione di circuito normalmente aperto o normalmente chiuso.
Riccardo
Reviewed in Italy on February 21, 2018
Do 5 stelle perché ritengo un prodotto di fattura veramente buona, azienda secondo me una delle migliori in questo settore, ho utilizzato questi relè insieme ad Arduino e vari sensori tra cui quello di luce e dei micro controllori per comandare a distanza, o in base alla luminosità che c'è di accendere le luci del mio corridoio.Consiglio vivamente a chi ama fare queste cose per passatempo o anche per divertimento.Una piccola raccomandazione per chi usa la corrente di casa di staccare la corrente e usare il polsino anti-statico, per prevenire eventuali elettrocuzioni che possono rivelarsi pericolose, inoltre controllate sempre bene i collegamenti priva di riattaccare la corrente e accendere i vari dispositivi, consiglio anche di installare nel circuito dei fusibili per evitare di mandare in corto-circuito per sbaglio i vari componenti che state utilizzando assieme al modulo relè.
Enrique Phan
Reviewed in Spain on May 17, 2017
Este Shield es de muy buena calidad y además facilísmo de utilizar: Conectas Vcc y GND y luego las salidad de tu arduino(u otro microcontrolador) a las cuatro entradas disponibles. Cabe destacar como otros muchos usuarios, que la lógica es invertida; es decir, cuando la salida del arduino es HIGH, el relé esta apagado y viceversa.
Merlin'sPicks
Reviewed in the United States on March 18, 2017
I am extremely happy with this board. It works flawlessly with the Arduino. It is responsive and VERY easy to use.Remember though, that its logic is Active Low, so when power is first applied from the Arduino, the low state of the pins causes the relay to turn on until the Arduino has time to set them to active high, thereby turning them off. I solved this problem using a 2N2222 transistor and a 1k Ohm resistor between an Arduino pin and the 5 volt input to the relay. Now, when the Arduino powers on, there is NO power to the relay board UNTIL the program tells it to do so.GREAT PRODUCT - HIGHLY RECOMMENDED!
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