We can connect the DO output interface to the microcontroller’s Input/Output port. When we attached a block detection sensor, then we can detect the speed by using the RPM Sensor Arduino Module. Connect the DO modules with the relay, limit switch, and other functions, Through DO Modules can also create a connection with the active buzzer module, compose an alarm.

Wiring specification of RPM Sensor Arduino Module:
VCC: Connect the positive 3.3 5 v power supply
GND: Connect power negative
DO TTL: switch signal output.
AO: This module does not work.

VCC: Connect the positive 3.3 5 v power supply
GND: Connect power negative
DO TTL: switch signal output.
AO: This module does not work.VCC: Connect the positive 3.3 5 v power supply
GND: Connect power negative
DO TTL: switch signal output.
AO: This module does not work.VCC: Connect the positive 3.3 5 v power supply
GND: Connect power negative
DO TTL: switch signal output.
AO: This module does not work.VCC: Connect the positive 3.3 5 v power supply
GND: Connect power negative
DO TTL: switch signal output.
AO: This module does not work.VCC: Connect the positive 3.3 5 v power supply
GND: Connect power negative
DO TTL: switch signal output.
AO: This module does not work.