Recent content by jumblies

you might take a look at opengarage or other open source projects. I've recently built a sonar sensor for garage door detection and you can use a simple wifi activated relay to trigger the wall switch. You do have to figure out how to secure these items via VPN or SSL/TLS connection. Lotsa...

Thanks for the snap. Was that tracing during a button press or idle? So I guess my next question is, what happens if there is no serial communication and the 888LM derives it's power from another source. The 888 is the critical control component since all other peripherals have to be linked...

I see your point. I'm curious why a linear reg would alter the comms. Stepping down from a 33V unloaded signal to say 20V would still provide power to the unit. If the digital communication is over the wires it would still work. There must be a resistance tolerance since they don't know what...

I replaced mine with an ebay refurb. The only thing I noticed is that the new one has different looking Hy-Cap capacitors. That doesn't mean diddly since the casing changes. I did power my defective one with a DC power supply. A few observations: It powers on at 6-9V and appears to start...

Thanks for that reply. I tried replacing the caps on one, but it made no difference. I think there are a couple of problems with this design. I am led to believe that it is an MCU failure but I'm not sure. I haven't even looked to see if it has UART hookup. I can also corroborate your...

I found this by googling 888LM failure. I'm on my 2nd replacement from a 4 year old set paired to a 8500 opener. This problem is very common. For people experiencing failure, what voltage are you seeing on the wires to the wall controller? I just checked and am seeing 33 volts which...