This is a Tibbit module — part of the Tibbo Project System that allows you to build your own custom embedded device with only the components you need. Start with a Tibbo Project PCB, add Tibbits like this one, then place the built design into a Tibbo Project Box to complete your product.
Tibbit #06: Two mechanical high-power relays with normally opened and normally closed terminals.
These relays have contact capacity rated at 16A/48V (resistive load).
To activate a relay, set the corresponding control line LOW. When left unconnected, control lines default to HIGH (and, hence, relays are off).
Combine this Tibbit with a terminal block C Tibbit #20.
There are two red LEDs each of which is connected to a relay control line. They light up for the LOW state of their respective control lines (i.e. when the corresponding relay is activated).
M2T Tibbit Modules Overview M2T Tibbits are taller double-width modules occupying two standard M sockets on a Tibbo Project PCB (i.e. TPP2 or TPP3). Their footprint is roughly 14 × 14 "squares" (one "square" is 2.54 × 2.54 mm). The M2T modules are 17.5mm high.
M2 modules have four groups of 6 pins arranged into two rows:
Pins 14-17 and 20-23 are control lines A-H.
Pins 2-5 and 8-11 are I/O lines.
Pins 12 and 24 are the GROUND and +5V power pins.
Pins 1 and 13 are for the optional +15V and -15V voltages needed only by few Tibbits. A special power supply Tibbit (#12) generates ±15V from the main 5V power.
Pins 6, 7, 18 and 19 are unused and should be left unconnected.
Notice that each pin row has a "missing pin" in this middle. This separates a row into two groups of 6 pins.