HiLetgo2pcs DC 5V Trigger Time Delay Switch Relay Module Adjustable Time Delay Control Swtich Trigger Delay Conduction Relay Switch Module Wide Voltage Delay Relay DC 5V-30V Micro USB Power

I used this to cycle a closet light LED.As previously described the solder terminals for power and trigger are very small but I had no difficulty with this connection - just make sure you have a good tip on your iron.The time adjustment was as described up to about 25 seconds and was very reliable.The relay is NO or NC and rated to 10 amps.Trigger is as easy as trigger solder spot to ground.It is very small and easily fit in a shallow outlet box.Overall as long as this unit does not fail I am extremely happy and the cost was super cheap.Highly recommended!

I powered it up with 5 VDC through the micro connector on the board. It works exactly as described. I like that fact that it requires a negative going trigger that is accessible from a pad on the circuit board. To trigger the delay, one need only bring the trigger terminal to ground to begin the delay. The delay may also be triggered by depressing and releasing the small push button switch on the PC board. The time delay is easy to adjust with the onboard potentiometer. Trigger Behavior: a) If the trigger is held for a period shorter than the set delay, the relay will hold for the remainder of the delay after the trigger is released. In other words, the delay begins the instant the trigger is grounded. b) If the trigger is held for a period longer than the set delay, the relay will hold until the trigger is released, and the relay will open immediately and without further delay. I tried grounding the trigger terminal with a 1N5711 diode and the delay would not trigger. One might infer that the forward voltage drop of the diode < 1 VDC is still too great to trigger the delay circuit. The trigger must be brought closer to ground.

They work as advertised and have a high build quality (like most all of these Chinese modules). For the price, I can't complain but a couple of little things. My biggest program is that the three solder pads are not at the standard .1" spacing. (You have to use the pads if you want to use other than 5V). This means you can't just insert a three terminal screw terminal. I was able to solder on e in by bending the pins. They saved a little money, so OK, but they should have been at .1" spacing (or provide) a screw terminal (and skip the push button since I am not sure the purpose since it just pulls the trigger pad to ground. There is also no "power on" led, just an led while it is running the delay. All other similar boards have a red led for power and a green led when the module is running. I will likely add an led across the input power pads so I know it's on and waiting for a trigger (and not dead). Lastly, I understand why most all of these boards use a negative trigger since that is the easiest with a 555, but it would be nice to have a positive trigger option. Having high and low triggers would be unique for just another transistor and a couple of resistors.

My rear defogger stopped working, car control module obsolete, I added this to run it, used the existing relay for the defogger circuit in my '99 Taurus.

ordered four, only one works as advertised. the trigger buttons on the board only work a few cycles before sticking, and when i could get some of these to mostly work, they would trip at random times for random durations. absolute junk!!

In my testing, this only works with a momentary trigger input. If the trigger is held indefinitely (or longer than the set time), the relay will remain active until the trigger signal is removed, thus overriding the timer completely. No mention of this in the description. This majorly limits the applications for this unit, and is unsuitable for what I needed.

It's easier than you might think. And it works perfectly!I had been confused about why there was both a mini-USB for power and a V+ V- power, and what to connect the low level trigger to get it to trigger. I was overthinking it I guess. It's very simple how I got it to work.I used mini-USB power.The solder pads for the V+, V-, and TRIGGER are pretty small and I'm a hack when it comes to soldering things. (I'm very bad.) I had asked a question about how to power and trigger and the answer was great plus the person who answered suggested alternating which sides of the PCB to solder, that is, (if soldering to all 3), solder the V+ and TRIGGER on one side and V- on the other side. I only needed V- and TRIGGER so I did one on one side and the other on the other side. (Thanks for that tip Elec/CS engineer !!)On USB power connecting TRIGGER to V- will trigger the relay for a few seconds. I turned the timer setting several turns, maybe 3 or 4, (I forget now) and got it to turn on the relay for about 4 seconds.I have a WGen Westinghouse generator with a 7-pin connector for remote start and want it to start when the grid goes down here. (It's a lot more complicated but this is enough information for this purpose.) I'm not liable for anything you do and anything you do will void your generator warranty. Connecting pins 2 and 3 on the 7-pin connector momentarily will start the generator. Touching pins 2 & 3 for about 4 seconds will stop the generator. In my case the generator start and stop are the same signal AND it seems that, when the generator is STOPPED touching 2 & 3 for 4 seconds will START and when the generator is RUNNING touching pins 2 & 3 for 4 seconds will STOP the generator.So - what I did was to put this little timer relay between my inverter STARTUP the generator and STOP the generator so that that same signal will do what it wants. (The inverter will KNOW when the generator us running when there is AC power from the generator.)I'll update this review (hopefully) with some pics and maybe even a video.

yhry seem to work good however one was bad out of the box