I begin with RFlink.
Getaway prototype on a bread with Rf module Velleman RX433N, a PullDown on the data link and a 35cm 2.5mm² copper wire as antenna
5Vcc seems clean (less than 50mv of noise)
I have 2 switch with "NewKaku" identification. The 2 switch work well (less than 10% off transmit loss).
But I have a Renkforce FT007TH with "F007_TH" identification with lot of transmit loss. The Renkforce FT007TH send data evry 60s, but the RFlink getway send decoded data only few time per hour, some time 40minute between 2 decoded transmit.
Both, switch and FT007TH are place close to the getaway.
The Velleman RX433N have a "linear out", I am not sure but it look like a RSSI out. View with a scope, amplitude of transmit from my switch an from the FT007TH are similar and with very good SNR.
At each FT007TH transmit the debug mode trace data like this :
Code: Select all
20;04;DEBUG;Pulses=296;Pulses(uSec)=270,150,660,120,660,150,600,150,630,180,600,180,600,180,570,210,600,180,570,210,570,690,1050,720,1050,720,570,210,570,210,1020,750,1020,750,1020,750,540,240,1020,270,510,270,510,270,510,750,540,240,540,240,990,780,990,780,510,270,510,270,990,300,480,300,480,780,510,270,990,780,510,270,510,300,960,300,480,300,480,780,960,330,480,780,960,780,960,810,480,300,960,330,450,810,480,300,480,300,480,300,960,330,450,330,450,330,450,330,450,330,450,330,450,330,450,330,450,330,450,330,450,810,930,840,930,840,450,330,450,330,930,810,930,810,930,810,450,330,930,360,420,360,420,360,420,840,450,330,450,330,930,840,930,840,450,330,450,330,930,360,420,360,420,840,450,330,930,840,450,330,450,330,930,360,420,360,420,840,930,360,420,840,930,840,930,840,450,330,930,360,420,840,450,330,450,330,450,330,930,360,420,360,420,360,420,360,420,360,420,360,420,360,420,360,420,390,390,360,420,840,900,840,900,840,450,330,450,330,900,840,900,840,900,840,420,360,900,390,390,390,390,390,390,840,420,330,450,330,900,840,900,870,420,360,420,360,900,360,420,390,420,840,420,360,900,870,420,360,420,360,900,390,390,390,390,870,900,390,390,870,900,870,900,870,420,360,900,390,390,870,420,360,420,360,420,360,480,6990;
20;05;DEBUG;Pulses=36;Pulses(uSec)=90,60,0,60,30,60,0,60,90,0,90,30,60,60,90,0,90,30,90,30,90,60,60,0,90,30,90,30,30,60,60,60,30,30,60,60;
I am not fluent with RF applications, I suppose some explanation :
- trouble with my receiver, I don't now if it is a good one. But the 2 switch are well detected
- trouble with the FT007TH probe, unstable transmit timing for example
- software bug
Any one have an idea ?
Thanks
David