This module is a version of the relay module previously developed to support a contact closure input for activation. This module is different where it doesn’t require a contact closure, or shorted-path to activate the relay output at J2. Instead, it supports a GPIO (general purpose input/output) signal for relay activation. The other connections and functions remain the same except the mode of activation at J1 just changes in support of an SBC such as an RPi, Arduino, Espressif, Nucleo, etc. The prior module is intended for external contact closure or shorted connection at the input connector J1. Using a simple twisted pair of wires, for example.
This module required both SN74LVC1G66 analog bilateral switch and a TLV73330 low voltage dropout regulator (LDO) to translate low voltage levels from GPIO signals at 1.8, 2.8, 3.0V, or 3.3V to a steady 3.3V level necessary to set up enough source strength at the relay. It is set in series with the analog SPST switch as necessary to drive the relay (i.e. deliver GPIO signal to the relay).
The other notification LEDs are present as before to indicate the ACTIVE state of the relay and power presence at the module.
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