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Lowpass filter - how DOES it work?
#1
Rainbow 
Hello.

OMG. I searched for lpf and nothing comes out of it. So. How does this filter thingy work?

Today I soldered the filter together. I build the binary on RPi1 and flashed the ATTiny45. Works flawlessly. BUT: what to do next? Since then no signal is getting through it filtering - I guess. I tried values of 8 to 2600 or 8 to 5000. Nothing happens anymore. 

Filter says

Code:
{
    "message": {
        "version": 3.00,
        "lpf": 1000,
        "hpf": 26000
    },
    "origin": "receiver",
    "protocol": "pilight_firmware",
    "uuid": "0000-b8-27-eb-d7a752",
    "repeats": 1
}

So there's life. I want to get data from my Quigg 7000 remotes. But nothing comes through filter...

What am I missing? And: where's the real deal wiki for the filter?

Thank you very much for help...

Code:
433gpio: 4879218
433gpio: 1379
433gpio: 1184
433gpio: 263
433gpio: 450
433gpio: 252
433gpio: 235
433gpio: 231
433gpio: 233
433gpio: 235
433gpio: 988
433gpio: 293
433gpio: 583
433gpio: 264
433gpio: 238
433gpio: 1065
433gpio: 304
433gpio: 181
433gpio: 976
433gpio: 258
433gpio: 1220
433gpio: 1167
433gpio: 303
433gpio: 508
433gpio: 262
433gpio: 234
433gpio: 237
433gpio: 837
433gpio: 350
433gpio: 1112
433gpio: 294
433gpio: 712
433gpio: 279
433gpio: 234
433gpio: 850
433gpio: 257
433gpio: 1078
433gpio: 246
433gpio: 236
433gpio: 561
433gpio: 264
433gpio: 995
433gpio: 317
433gpio: 482
433gpio: 1033
433gpio: 248
433gpio: 1053
433gpio: 529
433gpio: 266
433gpio: 233
433gpio: 941
433gpio: 340
433gpio: 504
433gpio: 253
433gpio: 968
433gpio: 549
433gpio: 266
433gpio: 234
433gpio: 1118
433gpio: 242
433gpio: 229
433gpio: 912
433gpio: 674
433gpio: 1067
433gpio: 251
433gpio: 230
433gpio: 947
433gpio: 366
433gpio: 1123
433gpio: 289
433gpio: 1106
433gpio: 297
433gpio: 1057
433gpio: 375
433gpio: 552
433gpio: 260
433gpio: 243
433gpio: 241
433gpio: 977
433gpio: 286
433gpio: 1116
433gpio: 300
433gpio: 1090
433gpio: 287
433gpio: 1097
433gpio: 289
433gpio: 1073
433gpio: 636
433gpio: 333
433gpio: 269
433gpio: 251
433gpio: 233
433gpio: 992
433gpio: 1134
433gpio: 299
433gpio: 239
433gpio: 238
433gpio: 1086
433gpio: 296
433gpio: 1108
433gpio: 299
433gpio: 1083
433gpio: 468
433gpio: 252
433gpio: 229
433gpio: 231
433gpio: 233
433gpio: 303
433gpio: 983
433gpio: 1262
433gpio: 292
433gpio: 234
433gpio: 1116
433gpio: 289
433gpio: 1153
433gpio: 300
433gpio: 1104
433gpio: 299
433gpio: 1066
433gpio: 555
433gpio: 267
433gpio: 233
433gpio: 241
433gpio: 962
433gpio: 291
433gpio: 239
433gpio: 1131
433gpio: 298
433gpio: 1184
433gpio: 294
433gpio: 7571
433gpio: 315
433gpio: 1231
433gpio: 626
433gpio: 263
433gpio: 235
433gpio: 238
433gpio: 1040
433gpio: 363
433gpio: 238
433gpio: 1130
433gpio: 290
433gpio: 540
433gpio: 267
433gpio: 269
433gpio: 216
433gpio: 951
433gpio: 300
433gpio: 628
433gpio: 328
433gpio: 249
433gpio: 1135
433gpio: 289
433gpio: 1154
433gpio: 235
433gpio: 465
433gpio: 268
433gpio: 232
433gpio: 1085
433gpio: 313
433gpio: 182
433gpio: 1007
433gpio: 258
433gpio: 609
433gpio: 370
433gpio: 1071
433gpio: 252
433gpio: 235
433gpio: 1010
433gpio: 290
433gpio: 582
433gpio: 572
433gpio: 1139
433gpio: 246
433gpio: 1128
433gpio: 288
433gpio: 1122
433gpio: 430
433gpio: 492
433gpio: 252
433gpio: 864
433gpio: 1196
433gpio: 453
433gpio: 1279
433gpio: 328
433gpio: 981
433gpio: 287
433gpio: 522
433gpio: 1134
433gpio: 275
433gpio: 1200
433gpio: 1140
433gpio: 303
433gpio: 1134
433gpio: 309
433gpio: 527
433gpio: 266
433gpio: 233
433gpio: 1059
433gpio: 246
433gpio: 630
433gpio: 496
433gpio: 2103
433gpio: 328
433gpio: 530
433gpio: 265
433gpio: 1061
433gpio: 260
433gpio: 1031
433gpio: 1390
433gpio: 1077
433gpio: 283
433gpio: 236
433gpio: 227
433gpio: 707
433gpio: 274
433gpio: 959
433gpio: 363
433gpio: 331
433gpio: 1200
433gpio: 339
433gpio: 1208
433gpio: 278
433gpio: 890
433gpio: 738
433gpio: 497
433gpio: 976
433gpio: 345
433gpio: 1422
433gpio: 277
433gpio: 234
433gpio: 235
433gpio: 933
433gpio: 271
433gpio: 238
433gpio: 1124
433gpio: 261
433gpio: 1305
433gpio: 242
433gpio: 493
433gpio: 258
433gpio: 1128
433gpio: 302
433gpio: 1168
433gpio: 261
433gpio: 1240
433gpio: 307
433gpio: 1162
433gpio: 293
433gpio: 7578

That must be the weather station Auriol H13726A, that I want to decode!
 
Reply
#2
@culymo

Just curious, do we have a new forum administrator (DE8MSH)?
 
Reply
#3
(10-01-2016, 06:15 PM)Niek Wrote: @culymo

Just curious, do we have a new forum administrator (DE8MSH)?
Fixed.
 
Reply
#4
Hi,

did you find a solution to receive commands from a quigg 7000 remote?

I noticed the same problem. Have RXB6 receiver directly connected and get all commands from the quigg 7000 (Conrad TR502MSV). I received the attiny45 today, installed and flashed it and get values from 2 GT-WT-02 weather sensors.

But there is no code received sent from the remote.

As soon a as I connect another RXB6 without lpf, the remote is recognized immediately:

        "message": {
                "id": 2816,
                "unit": 0,
                "state": "on"
        },
        "origin": "receiver",
        "protocol": "quigg_gt7000",
        "uuid": "0000-00-xx-xx-xxxxxx",
        "repeats": 1
}

Updated to firmware v4: https://github.com/yablacky/pilight_firm.../filter_v4 but without change.
 
Reply
#5
The QUIGG GT7000 has a footer value in the range of 81000µS, the minimum transmission rate for the RXB 6 is specified with 58 Baud, or 17241µS ....

Depending on the hardware setup and with the standard LPF filter settings this footer value may not be passed on for further processing and as a consequence the protocol is not recognized.
 
Reply
#6
(10-01-2016, 06:15 PM)Niek Wrote: @culymo

Just curious, do we have a new forum administrator (DE8MSH)?
Should have known earlier *lol*.

(10-02-2016, 09:24 AM)jlang Wrote: did you find a solution to receive commands from a quigg 7000 remote?

Nope. Since I put the filter inbetween I get no meaningfull signals out of the air anymore Crying.

(10-02-2016, 10:36 PM)wo_rasp Wrote: The QUIGG GT7000 has a footer value in the range of 81000µS, the minimum transmission rate for the RXB 6 is specified with 58 Baud, or 17241µS ....

Depending on the hardware setup and with the standard LPF filter settings this footer value may not be passed on for further processing and as a consequence the protocol is not recognized.

Ok. So what values must I write into the code of filter for Quigg 7k?
 
Reply
#7
Well, originally I removed all filter functionality from my LPF, with my PI2 and 3 i do not use any filters anymore.
 
Reply
#8
Hello,
yesterday i tested the filter (V3) and CPU-usage of  PI-Zero goes really down.
Only one problem existed: sometimes i got nothing usefull at the output of the filter.
So i took my scope connected to input and output of the filter:
over minutes the output was inverted to the input, that's not good.
So i changed the toggle in PCINT0-ISR into reading REC_OUT and writing this to PI_IN.
Now the inverted pulses are away.

What do you think about it?
 
Reply
#9
Nice! Can we discuss this in a PR on github?
 
Reply
#10
(04-16-2020, 05:05 PM)curlymo Wrote: Nice! Can we discuss this in a PR on github?

Hi again,
i am not at github. PM wanted?
The problem is, if you have two ISR running which are blocking with cli then you will risk missing edges in this case.
Two or four ... edges not seen is no problem, one or three ... results in inverted signal if you only are using toggle.
It's also critical to change PI_IN inside PCINT0_ISR and outside...
Summary i modified PCINT0_ISR as written and have only wdt_reset() and ten_us_counter++ in TIMER1_ISR.
Works perfect, fits in attiny25.
 
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