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[Obsolete] Low-pass filter schematic (old version)
#1
Those wanting to build the low-pass filter, check this wiki page: http://wiki.pilight.org/doku.php/electronics
 
#2
Hi There,

Looks like I've something wrong in my setup. I connected the devices on a breadboard but I do not recieve something.

Guess the bigest thing that can be wrong is the LM358P. But I think I also connected this right:
Receiver out: pin 3
GND (bottom): pin 4
- side: pin 2
output to SN....: pin 1

I guess that is right.

Any other tips what can be wrong? I can't show the breadboard, it is a big wire mess Smile
 
#3
Just connect a led between the different components and check if it blinks.
 
#4
I've now connected the LM358P like on the schematic, I've connected the output to the led, and the led to the GND.

The led is on (not blinking)

When I disconnect the GND from the LM358P the led starts blinking and blinks faster when I press a button on a remote. I've to connect pin 4 of the LM358P directly to the ground right?
 
#5
Here you have a pin layout of the LM358P:
[Image: LM358-pinout.jpg]
Pin 4 to ground is correct.

Please notice that when you attach the led directly to the receiver you get a really dim blinking led. When you have correctly connected the op-amp the led should be blinking really bright. That's the whole point of the op-amp. If that works, you can add the schmitt trigger.
 
#6
Ok, looks like it works know. tested it new step by step with connecting wires.

It responses only very slow. I have to press the button on remote at least for 2 secs before it shows up in pilight.

Is rx module maybe still wrong? I've ordered it by the iprototype link you gave. I have http://www.wenshing.com.tw/Products/RF_M...er_Module/
 
#7
Make sure you use the gpio hw-mode once you're using the low-pass filter. Check the github readme on how to do this.
 
#8
having this in settings.json:

"hw-mode": "gpio",
"gpio-sender": 0,
"gpio-receiver": 1,

and I have not loaded the lirc modules.
 
#9
Than is should be fairly instantanious. Please check your circuit once more.
 
#10
I finally have al the components for the filter, however, am not sure if it's working correctly. For testing I put a LED on the GPIO output on the SN74, to GND. The LED does light up after sending a command and slowly fades away. Is this correct behaviour?

If so, I'll have to take a look at the software part..
 
  


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