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Low Pass Filter and Receiver in Series? re-post
#1
Low Pass Filter and Receiver in Series?
Hi,

to reduce the CPU load and noise I'm planning to build the recommended low pass filter for my 433 MHz receiver.
The components are still on their way but I'm already thinking about the wiring.
My Raspberry Pi 2 has two 5V pins. One of them is blocked by my motion detector (which really needs 5V) and the other one is connected to the 433 MHz receiver.
My first idea was to use a 3.3V pin of my Pi for the filter but according to the specifications for the used frequency of 16 MHz 4.5 - 5.5V are needed for the ATtiny45. I also found this post
(12-20-2015 03:18 PM)curlymo Wrote:
Yes, running it on lower voltages can make the tiny less accurate frequency wise. We are running it on it's top frequency. 5v with resistors is safe.

My next idea was to run the filter and receiver in series. I'm only a beginner in electronics and assume that less accurate frequency results in difficult to find problems. Therefore I want to ask you if it is possible to not only connect the 433 data pin but also the voltage and ground pin of the receiver to the filter instead directly to the Raspberry Pi? So it would look schematically like:

Code:
Receiver Filter Raspberry
### Data ### Data ###
###-------------- ###-----1KOhmResistor-----###
### 5V ### 5V ###
###---------------###-----------------------###
### Gnd ### Gnd ###
###---------------###-----------------------###
### ### ###
 
#2
@Gustavo Woltmann why the repost? This topic has already been discussed here: https://forum.pilight.org/Thread-Low-Pas...-in-Series

I'm closing this thread.
 
  


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