Description
Relay module 2 channel 5V. The relays on this module can be controlled with a 5V signal from an Arduino or other microcontroller. The relays can be used to switch between alternating current (max. 230V) and direct current (max. 30V) up to 10A. With handy screw terminals for connecting the device to be switched. The relay has a normally open and normally closed contact.
Relay module 2 channel 5V specifications:
– Control signal: TTL level
– Maximum switching voltage: 250VAC 30VDC
– Contact action time: 10ms less
Electronics4Fun (verified owner) –
Versatile relay module that you can easily connect to your Arduino output and you have 2 potential-free changeover switches at your disposal, so completely electrically separated from your Arduino.
On the print of this relay module are transistors that switch the relays, so your Arduino output is hardly loaded, so that you can also control multiple of these relay modules on 1 digital output without any problems. Switches up to 250 volts / 10A alternating current or up to 30 volts / 10A direct current. If you want to switch 220 volts double-pole, use the contacts of these two relays. You now also have two changeover relay contacts at your disposal. You can also make a cross switch with 2 changeover contacts, then you can, for example, reverse the direction of rotation of a DC motor.
Edwin (verified owner) –
This relay can be controlled perfectly from the Raspberry. The +5V and GND from the GPIO pins of the Raspberry connect to the relay module as a power supply, and then an output of the Raspberry to an input of the relay module. If you connect the output of the Raspberry then makes it low (so pulls to 0 V), the relay switches, if you switch the output to high (so to +3,3 V) then the relay switches back. Exactly the opposite of what I expected, but no problem, the relay has a changeover contact after all.
The relay module also has two LEDs, useful for indicating the status of both relays. Also present are two optocouplers (the PC817), for good galvanic isolation. This is not even mentioned in the specs on the website, but is present. Each relay is switched by a transistor (so no large current over the output of the Raspberry), and is neatly protected by a quenching diode.
The relay module also has a jumper (JD), unfortunately there is no documentation to explain what exactly it is for (perhaps the relay can also be switched 'the other way around', so 'on' with a 1 and 'off' with a 0 on the input). Not tried yet.
Tip to Hobby Electronica, to mention the LEDs, the optocouplers and the jumper on the website.
Small downside of the relay module: the mounting holes of the print are so close to the connection terminals, that you can't put a decent M3 bolt through them (see also the photo on the website). I had to file the terminal a bit, to get it to fit, and to be able to attach the print. If the print could be a bit bigger, then it would fit a bit better.
Rating: four stars, due to the missing documentation and the mounting holes, otherwise it would have definitely been a five!
bornwird (verified owner) –
Easy to connect to an Arduino board, and works properly.
Switches large current to small current (on and off).
J Verwaal (verified owner) –
For those wondering what the jumper is for:
Advanced
The pins of the 1×3 pin header are marked on the PCB:
RY-VCC – This is the 5V required for the relays. At delivery, a jumper is present on this and the adjacent (VCC) pin.
VCC – This is the 5V VCC supplied on the 1×4 pin connector
GND – Connected to 0V pin or 1×4 pin header
If opto isolation is required, an isolated 5V supply should be used. For normal operation, a jumper bewtween pins 1 and 2 selects the 5V signal from the 1×4 pin header. This means both the “input side”, and “relay side” use the same 5V supply, and there is no opto-isolation.