Drok Timer Relay, Time Delay Relay Dc 5V 12V 24V Controller Board Delay-Off Cycle 0.01S-9999Mins Trigger Switching Module With Lcd Display Support Micro Usb Power Supply

works fine as it should, it comes with a manual explains everything but they need to add it to the amazon description, I don't know why it does not go to sleep if it is in an infinite loop, I was hoping that I can reduce the power of the screen. I like the 4 stand pieces. I will update if anything bad happens.

This is a great timer module, unbeatable at this price. I chose this one over the many others because the function display appeared best (and it is). It is easy to set; with a little practice, you can easily memorize the very logical steps to set the various modes. I have explored all the timing modes, and P7 often suits my needs perfectly. It has fast startup, and can trigger when signal and power are applied simultaneously. Both high and low inputs are active, so it is possible (as in my case) to trigger and block timing by both these channels in opposition. So far, it seems to have good noise immunity, and works correctly every time. The instructions are an imperfect translation, but they do send a spec. sheet with the timer (which they keep improving with each order). I'm still prototyping, but plan on using these to time an automatic backup generator run for my PV system. I ordered more. More details to come as I finalize the application circuit. [UPDATE] I now have 5 of these involved in my project. I'm using P1 and P7 as general time-out programs, and P6 for the auto-starter (which cycles the starter every few seconds until the generator starts, or the cycle times out). I even use one to beep a warning horn for a few seconds before the actual starter engages, so anyone nearby is aware of the pending startup. I never would have pursued such a project if I hadn't found these! DROK sells other things too, and I'm eager to check out some of their other products.

very versatile. i use these to periodically circulate how water thru my heating system to avoid frozen pipes. a little tricky to figure o ut the programming, but great units. the display turns off after 5 minutes, but you can defeat the auto turnoff if you want to keep display on. also, the settings stay when power is off, so no worry about losing your settings. these duplicate a unit i invented, called the pipesaver about 40 years ago or more, but now with these, my design is obsolete. just add power (can power with a small usb block and cable or other sources.) and hook up to whatever you need to control. relay is 10 amps up to 250v. these can be used as a cycling timer, or time delay o or off, etc. lot of uses.

At first I was unsure if this unit would do what I wanted. I was trying to find a way to start the cycle on my ice maker at specific times so it it would have ice ready for me before I wake up and before I get home from work because I dont want it to run all day. It has no built in timer function or anything and it does not automatically start when its powered on so my only option was to build something custom. After thoughts of building some convoluted finger mechanism with linear actuators to push the button, I realized that was just stupid. After some searching, I found various different timing units, most of which did not seem like they would do what I needed. I came across this unit and asked the community if it can be used as a momentary close function without applying any voltage. The answer from another owner helped me so I took a chance and ordered it. I received it quickly and did some testing with my multi-meter and found it will do exactly what I needed and I confirmed this does not apply any real voltage during this process so its perfect. (Note that I am only using USB power, nothing else). For anyone else looking for something like this too, I set it to P6 mode(which does not require a input trigger because it triggers at power on), set the OP to 0.8s (which is how long to close the circuit at power on), the CL to 1s (which is the time to wait before restarting the OP cycle), and LOP to 1 (how many times to loop). With P6 mode and all of these settings, it powers on, closes the NO and COM circuit for 0.8 seconds and open again for 1 second but since the loop is set to 1, it stops there. After I wired it up to the switch on the ice maker (which was a tricky task), I was able to use a smart power strip like this one Smart Power Strip WiFi Plug and schedule it to turn on the USB power on at specific times which causes the timer to instantly close and open the circuit, thus pressing the start button. I was also able to set a automation on the power strip app so when ever the USB is powered on, 1 minute later it will automatically power it off. If I ever need to Start/Stop the ice maker outside the scheduled times, I just tell Alexa to "Turn on Ice Maker". I cant ever use "Turn Off Ice Maker" command because of the setup but "Turn on Ice Maker" will do it as well. UPDATE 03/16/2020: The timer is still going strong for this use. It has allowed me to power my ice maker on using a schedule with the Alexa enabled power bar so I would have ice when I wake up, and when I get home from work. The only thing that was not working right was having the power bar turn off 1 minute after it gets turned on. It would work for a few weeks but for some reason, would stop turning it off. This is not the fault of the timer, it is the poorly designed app of the power bar. Otherwise, it has been a godsend to have this. I should be getting a 3D printer soon and once I do, I "plan" to print my own case for the Drok timer since there does not seem to be one available. It will just make things a little nicer, but is not required.

The rear wiper on my jeep only has one speed for intermittent timing, about 5 seconds. Too short for water to accumulate on the glass, so it makes an annoying squeaky noise and also wears out the wiper if you leave it on. I installed this device in line with the power from the switch for the rear wiper, and set it so that it will trigger the wiper every 30 seconds. Took me a couple of hours to figure out how to install/wire/program the whole thing and then put all of the interior bits back into the jeep. The new, longer interval is much better. It works perfectly, though. The instructions are very clear and the unit itself is rather intuitive to set up and program. The device has numerous other features and programmable settings to do more complex operations than what I used it for. Seems to be a good price for what it is capable of doing. I hope that it lasts a long time! If it craps out earlier than I arbitrarily believe it should, then I will come back here and complain about it in this review.