Operating voltage: DC9V
Standby current: 10UA
Induced current: less than 30MA
Output: Relay normally open, normally closed, or the output high and low
Working temperature: -5 -50 ℃
Smoke module wiring instructions
Black: Power ground
Red: positive power supply DC9V
White: Relay normally open
Blue: relay common
Green: The relay normally closed terminal
Simple test method:
1. press the test button 3S, light starts flashing, the relay normally open relay with common terminal connected.
2. can also be smoking cigarettes, the smoke blowing in the maze, so 3S light starts flashing, the relay, the relay is turned often start with common
Adjusting the POT clockwise seems to increase sensitivity (I only went 1/2 turn since it may not have a stop).
When it detects smoke, the LED will flash (prior to triggering), and then when it finally triggers, it will flash continuously for a bit and then slower, which I think is just indicating some threshold is met on the sensor. When triggered, the relay will switch, but will only stay latched for about 1min before switching back if the smoke is removed. When triggered there was 8.63v on the "out" line on the header to the right of the relay (that was with 9v input Vcc for the sensor), I suppose that could be used for an alarm or buzzer.
If power is disconnected, the relay it will revert to the normally closed (green wire) terminal connected to common (blue wire). Interestingly I triggered it, and accidentally pulled the ground wire, which flipped the relay back to NC, but when I reconnected it, the relay went back to NO (alarm) for less than a minute before reverting to NC, possibly due to some residual smoke still in the sensor.
This relay does not latch so it won't be good for keeping something turned off after smoke is detected which sucks. Will need to use some additional logic or circuit stuff to make that happen.