W1-therm Onewire 18b20 Sensor Not Working - OpenWrt Forum Trang chủ » W1 Therm Sensor » W1-therm Onewire 18b20 Sensor Not Working - OpenWrt Forum Có thể bạn quan tâm W201 Diferansiyel W201 Diferansiyel Ayarı W201 Et Waarde W201 Güzel Mi W201 Kilitli Diferansiyel W1-therm onewire 18b20 sensor not working For Developers novski April 21, 2020, 8:15pm 1 I built my own v19.07.2 with kmod-w1 and kmod-w1-gpio-custom as well as the desired kmod-w1-slave-therm for a Linkit Smart 7688 Target. I added echo "w1-gpio-custom bus0=0,19,0 bus1=1,20,0" > /etc/modules.d/55-w1-gpio-custom as described in the docs. I also checked the GPIO as described here. But the connected device (i double checked and even tried a second absolutely new 18b20) does not apear. In fact there are randomly changeing ID's apearing in the Kernel Log like these last 6 lines: [ 2884.519815] w1_master_driver w1_bus_master1: Attaching one wire slave 00.ec0000000000 crc 4a [ 2884.570850] w1_master_driver w1_bus_master1: Family 0 for 00.ec0000000000.4a is not registered. [ 2947.839911] w1_master_driver w1_bus_master1: Attaching one wire slave 00.1c0000000000 crc 3e [ 2947.890353] w1_master_driver w1_bus_master1: Family 0 for 00.1c0000000000.3e is not registered. [ 2987.045575] w1_master_driver w1_bus_master1: Attaching one wire slave 00.9c0000000000 crc b2 [ 2987.132644] w1_master_driver w1_bus_master1: Family 0 for 00.9c0000000000.b2 is not registered. I read a lot in raspi forums and had to regret that the /overlay stuff is not in my knowledge range. It maybe also differs to what openwrt is because it seems to be another way to do same things. I then tried to understan the kernel.org description but without success. root@openwrt:/sys/bus/w1/devices# lsmod | grep "w1" w1_gpio 2352 0 w1_gpio_custom 912 0 w1_smem 496 0 w1_therm 4752 0 wire 17171 3 w1_therm,w1_smem,w1_gpio root@openwrt:/sys/bus/w1/devices# ls 00-020000000000 00-7c0000000000 00-fc0000000000 w1_bus_master1 root@openwrt:/etc/modules.d# ls 20-usb-core 51-i2c-core ipt-nat nf-flow pppoe 30-gpio-button-hotplug 55-w1-gpio-custom ipt-offload nf-ipt pwm-mediatek-ramips 30-sound-core 58-i2c-smbus lib-crc-ccitt nf-ipt6 sdhci-mt7620 35-usb-ehci 59-i2c-mt7628 mmc nf-nat w1-master-gpio 40-usb2 60-leds-gpio mt7603 nf-reject w1-slave-smem 42-ip6tables ipt-conntrack nf-conntrack nf-reject6 w1-slave-therm 50-usb-ohci ipt-core nf-conntrack6 ppp root@openwrt:/etc/modules.d# cat 55-w1-gpio-custom w1-gpio-custom bus0=0,1,0 root@openwrt:/etc/modules.d# cat w1-master-gpio w1-gpio root@openwrt:/etc/modules.d# cat w1-slave-therm w1_therm What can I do more? AndrewZ April 21, 2020, 8:23pm 2 Let me share my notes on this. Modules required: kmod-w1 kmod-w1-gpio-custom kmod-w1-master-gpio kmod-w1-slave-therm Using gpio5: echo "w1-gpio-custom bus0=0,5,0" > /etc/modules.d/55-w1-gpio-custom Finally: cat /sys/devices/w1_bus_master1/28-xxxxxxxxxxxx/w1_slave novski April 22, 2020, 6:11am 3 AndrewZ: cat /sys/devices/w1_bus_master1/28-xxxxxxxxxxxx/w1_slave interessting path. My device shows at that path: root@openwrt:~# cat /sys/devices/w1_bus_master1/28*/w1_slave cat: can't open '/sys/devices/w1_bus_master1/28*/w1_slave': No such file or directory root@openwrt:/sys/devices/w1_bus_master1# ls 00-400000000000 w1_master_add w1_master_pullup w1_master_timeout 00-800000000000 w1_master_attempts w1_master_remove w1_master_timeout_us driver w1_master_max_slave_count w1_master_search subsystem w1_master_name w1_master_slave_count uevent w1_master_pointer w1_master_slaves I think i have found the /sys/bus path in this resource. It seams to be the same in a reduced way. I have also added the right GPIO. My first post has a copy and paste failure from the docs to this thread. It is not quite what I have done really as I have set GPIO 1: echo "w1-gpio-custom bus0=0,1,0" > /etc/modules.d/55-w1-gpio-custom not GPIO 19 & 20: novski: I added echo "w1-gpio-custom bus0=0,19,0 bus1=1,20,0" > /etc/modules.d/55-w1-gpio-custom its visable here: novski: root@openwrt:/etc/modules.d# cat 55-w1-gpio-custom w1-gpio-custom bus0=0,1,0 root@openwrt:/etc/modules.d# cat w1-master-gpio w1-gpio root@openwrt:/etc/modules.d# cat w1-slave-therm w1_therm I uninstalled kmod-w1-slave-smem, still no sensor is found. Don't know what to do... anon50098793 April 22, 2020, 6:20am 4 cat /sys/devices/w1_bus_master1/*-*/w1_slave novski April 22, 2020, 7:57am 5 anon50098793: cat /sys/devices/w1_bus_master1/-/w1_slave Thanks! Here the answer: root@openwrt:~# cat /sys/devices/w1_bus_master1/*-*/w1_slave cat: can't open '/sys/devices/w1_bus_master1/*-*/w1_slave': No such file or directory ? 1 Like anon50098793 April 22, 2020, 8:00am 6 ls /sys/devices/w1_bus_master1/00-400000000000/ ls /sys/devices/w1_bus_master1/00-800000000000 ls /sys/bus/w1/devices/00-020000000000/ ls /sys/bus/w1/devices/00-7c0000000000/ ls /sys/bus/w1/devices/00-fc0000000000/ p.s. i don't know much about i2c just filling in till @AndrewZ gets back... these seemed like the next step based on what you guys have written... but I suspect your issue is lower level. based on novski: [ 2884.519815] w1_master_driver w1_bus_master1: Attaching one wire slave 00.ec0000000000 crc 4a i believe with one-wire it often needs some sort of pull-up/down somewhere... for bias/reference AndrewZ April 22, 2020, 8:11am 7 I suggest to check (or even try another) gpio port, sensor wiring and, finally, the log file. I don't have 1-wire configured right now, so cannot show you the desired output. Maybe @anon50098793 can provide an example from his log. 1 Like AndrewZ April 22, 2020, 8:13am 8 anon50098793: i don't know much about i2c i2c is absolutely different story. Actually, I switched from 1-wire to i2c in order to put several devices I had on the same bus. 1 Like anon50098793 April 22, 2020, 8:22am 9 AndrewZ: provide an example alas, i've only used these things on uC/microcontrollers... , having said that 9/10 it's a wiring issue... AndrewZ April 22, 2020, 8:45am 10 novski: I have set GPIO 1 I'm a bit skeptic about using gpio1... what is your router model? Can you try another gpio? Better to check it with multimeter before configuring 1-wire stuff. novski April 22, 2020, 8:54am 11 My "router" model is a Linkit Smart 7688 and i have doublechecked the gpio by deleting the file in /etc/modules.d/55-w1-gpio-custom rebooting and toggle the gpio 1 whith this script stolen from the docs: #!/bin/sh GPIOBASE=`cat /sys/class/gpio/gpiochip*/base | head -n1` GPIOmin=`expr $1 + $GPIOBASE` GPIOmax=`expr $2 + $GPIOBASE` cd /sys/class/gpio for i in `seq $GPIOmin $GPIOmax`; do echo "[GPIO$i] Trying value $3" echo $i > export; echo out >gpio$i/direction echo $3 > gpio$i/value echo $i > unexport done and executeing it like that: ./gpio 1 1 1 ./gpio 1 1 0 While measuring the voltage on the pin 13. That pin goes to 3.3V when ./gpio 1 1 1 is given. So the wiring seams to be good. But granted, the pin can be not able to handle w1. I will solder it to another Pin and check. Thanks for the thoughts in the meanwhile, very appreciated. anon50098793 April 22, 2020, 9:25am 12 is this how its wired? ( pull-up to 5v or 3.3 )? you measured the logic levels in circuit? AndrewZ April 22, 2020, 9:33am 13 Checked the dts file - even gpio1 should be good. novski April 22, 2020, 7:18pm 14 Yes that's how its wired. I have a Ground as well so my connection has 3 wires in total. 3.3V Data GND Data and 3.3V are connected over a 4.7k Resistor. Data goes in to P13 = GPIO1 1 Like novski April 23, 2020, 6:51pm 15 I now changed the W1 Data wire to GPIO2 with no success. I have a previous built device in my house with 12 18b20 sensors on same Linkit Smart 7688 (it's productive) but that one is on OpenWrt SNAPSHOT r11009-4a85748040 / LuCI Master (git-19.264.32154-6dba41c) and it works on the GPIO2. I do not know how to compare what changed between that (wrongly built master branch) and the v19.07.2 tag. Is it possible to compare those two somehow? anon50098793 April 23, 2020, 11:49pm 16 rule out faulty sensor first. 1 Like novski April 24, 2020, 10:15pm 17 OMG. GPIO1 does not work but GPIO2 does. I realized today, I forgot the 4.7k resistor on my test yesterday with GPIO2. What's the difference between GPIO1 and 2? Từ khóa » W1 Therm Sensor W1thermsensor - PyPI W1-therm-sensor · GitHub Topics Raspberry Pi Tutorial Series: 1-Wire DS18B20 Sensor - Waveshare W1_therm Python W1-therm-sensor Projects (Nov 2021) - LibHunt Want To Know What Does W1-gpio And W1-therm Does Timofurrer/w1thermsensor - Docker Image 1-wire Temperature Sensor DS1820 At Raspberry Pi (GPIO Directly) PythonMiniProbe - W1thermsensor - GitLab - CDG82 [PDF] PROGETTO 2 REGISTRATORE DI TEMPERATURA - INFN Using DS18B20 1-wire Temp Sensors With The Raspberry Pi Thermal Sensor (1Wire) - Raspberry Pi Blog W1thermsensor - PyDigger