Hello first time poster here,
I bought a ceiling fan for my home office and it is controlled by an RF remote that I want to clone. Using an SDR I have determined that the frequency is 868 MHz and it uses pulse width modulation with fixed period. Since the only radio I have is a Feather M0 I couldn't use Kobuki's sniffer library and no matter how I tried porting it I couldn't quite figure out how to receive the remote signal on the Feather.
On the transmitting side I have tried to match it and came up short as well. This is the rtl_433 output for the remote:
Detected OOK package 2021-07-11 00:22:02
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time : [color=blue]2021-07-11 00:22:02[/color]
model : [color=red]Akhan 100F14 remote keyless entry[/color] ID (20bit): [color=red]0x220fe[/color]
Data (4bit): [color=green]0x2 (Unlock)[/color]
Analyzing pulses...
Total count: 25, width: 32.32 ms ( 8081 S)
Pulse width distribution:
[ 0] count: 15, width: 300 us [292;316] ( 75 S)
[ 1] count: 10, width: 968 us [964;972] ( 242 S)
Gap width distribution:
[ 0] count: 14, width: 1028 us [1024;1036] ( 257 S)
[ 1] count: 10, width: 368 us [368;376] ( 92 S)
Pulse period distribution:
[ 0] count: 24, width: 1332 us [1324;1348] ( 333 S)
Level estimates [high, low]: 15894, 145
RSSI: -0.1 dB SNR: 20.4 dB Noise: -20.5 dB
Frequency offsets [F1, F2]: -1301, 0 (-5.0 kHz, +0.0 kHz)
Guessing modulation: Pulse Width Modulation with fixed period
Attempting demodulation... short_width: 300, long_width: 968, reset_limit: 1040, sync_width: 0
Use a flex decoder with -X 'n=name,m=OOK_PWM,s=300,l=968,r=1040,g=0,t=264,y=0'
pulse_demod_pwm(): Analyzer Device
bitbuffer:: Number of rows: 1
[00] {25} dd f0 1d 80 : 11011101 11110000 00011101 1
And the output for my signal if I set the output to {0x22, 0x0F, 0xe2}:
Detected OOK package 2021-07-11 00:22:02
Analyzing pulses...
Total count: 24, width: 30.82 ms ( 7704 S)
Pulse width distribution:
[ 0] count: 13, width: 300 us [288;320] ( 75 S)
[ 1] count: 10, width: 968 us [964;976] ( 242 S)
[ 2] count: 1, width: 132 us [132;132] ( 33 S)
Gap width distribution:
[ 0] count: 13, width: 1028 us [1020;1036] ( 257 S)
[ 1] count: 10, width: 368 us [364;376] ( 92 S)
Pulse period distribution:
[ 0] count: 23, width: 1332 us [1324;1344] ( 333 S)
Level estimates [high, low]: 15902, 159
RSSI: -0.1 dB SNR: 20.0 dB Noise: -20.1 dB
Frequency offsets [F1, F2]: -900, 0 (-3.4 kHz, +0.0 kHz)
Guessing modulation: Pulse Width Modulation with sync/delimiter
Attempting demodulation... short_width: 300, long_width: 968, reset_limit: 1040, sync_width: 132
Use a flex decoder with -X 'n=name,m=OOK_PWM,s=300,l=968,r=1040,g=0,t=0,y=132'
pulse_demod_pwm(): Analyzer Device
bitbuffer:: Number of rows: 2
[00] {23} dd f0 1c : 11011101 11110000 0001110
[01] { 0} :
And the two signals on Universal Radio Hacker don't look similar as well:
Top one is the remote bottom one is the Feather output captured by the SDR.
I need some guidance on how to proceed. I believe I'm going wrong with the encoding of the signal (I don't encode mine, rtl_433 says the remote is Akhan encoded). But if I managed to capture the raw signal from the remote with the Feather I could just "dumbly" retransmit it right? And not worry about encoding. How would you proceed?
Thank you