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Impression:good,Simple,Practical;
The OPENJUMPER 4-CH Relay Module Compatible with Arduino is a very usefull product because it can be used for almost everything. I appreciate it.
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Impression:Excellent shield;
Very easy to use. Each channel has its own LED that indicates the state. Input impedance treated, no need of external resistors. Order input contacts, output contacts and LED corresponds. Output contacts have adequate switching capacity.
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Impression:Good product;
Pros : + Good product + Good price + Well quality + Arduino Full compatible product + LED to display activated relay + Work with 5v directly from Arduino board Cons : no cons Really recommanded to make your own DYI electronic system ;-) Time to make it working : 2 minutes :-D
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