The Pololu basic relay carrier modules allow simple control of a single-pole, double-throw (SPDT) switch from low-voltage, low-current control signals. This item includes the basic carrier PCB with a soldered-in 5 V relay, 5.0 mm terminal blocks for the switch connections, and straight 0.1" male header for the control connections. The included relay is an Omron G5LE-14-DC5.
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Our Code: MCU-60120
Supplier Link: [Pololu MPN:2480]
The Pololu basic relay carrier modules make it easy to control a single-pole, double-throw (SPDT) switch from low-voltage, low-current control signals. The modules are available with 5 V and 12 V power relays—Omron G5LE-14-DC5 and G5LE-14-DC12 (1MB pdf) .
The carrier board routes the three relay control pins to 0.1″-spaced pins compatible with standard solderless breadboads and female servo cable connectors. The assembled version of this board has a 0.1″ straight male header soldered to these pins while the partial kit version includes 8×1 straight and right angle 0.1″ male header strips that can optionally be broken into 3×1 pieces and soldered in. The relay switch pins are routed to a set of large pads intended for use with a 3-pin 5mm-pitch terminal block and a set of smaller pads with a 0.2″ pitch, making them compatible with 0.1″ perfboards. The assembled version of this board has a terminal block soldered to these pins while the partial kit version includes a 3-pin terminal block that can be optionally soldered in.
The switch portion of the relay is accessible on one side of the board while the control pins are routed to the other. The relay coil is powered by supplying 5 V or 12 V across the VDD and GND pins (depending on the relay), and it is activated by a digital high control signal on the EN pin. The control signal is fed directly to a BSS138 N-channel MOSFET, which in turn actuates the relay coil when the control voltage exceeds approximately 2.5 V (see BSS138 datasheet (92k pdf) for details).
The relay switch terminals COM (common), NO (normally open), and NC (normally closed) are routed on the PCB with a minimum clearance of 60 mils (1.5 mm) from other copper. The copper traces are designed to be at least 45 mil (1.1 mm) from the board edges, though manufacturing variations in the board edges can make those distances slightly lower.
In most applications, the current and voltage ratings for the module will match the ratings of the relay used. Maximum current, maximum voltage, and life expectancy are interdependent; we therefore recommend careful examination of your relay’s datasheet.
Size: 25.4 x 30.5 x 23mm