Re: [Owfs-developers] Owserver on pi (zero) using DS18B20 and pullup resistor

2016-09-19 Thread Colin Law
On 19 September 2016 at 13:23, Jan Kandziora wrote: > Am 19.09.2016 um 10:42 schrieb Colin Law: >> I have been trying >> to get to grips with device tree and (on pi with raspbian jessie) in >> /boot/overlays/README it says >> >> "Device Tree makes it possible >> to support many

Re: [Owfs-developers] Owserver on pi (zero) using DS18B20 and pullup resistor

2016-09-05 Thread Jan Kandziora
Am 05.09.2016 um 09:00 schrieb Colin Law: > > When estimating device temperature for devices mounted on a PCB the > convention is to use a linear model (see [1] for example). This > applies to devices such as transistors mounted above the PCB on leads > as well as to surface mount devices. Quite

Re: [Owfs-developers] Owserver on pi (zero) using DS18B20 and pullup resistor

2016-09-05 Thread Colin Law
On 4 September 2016 at 19:59, Jan Kandziora wrote: > Am 04.09.2016 um 19:08 schrieb Colin Law: >> >> I have it to 3.3V ok. So 4.7k is ok for 3 wire mode but for parasitic >> it should be 1.5k >> > Yes. > >> >> To summarize then, for parasitic mode I should not need an external >>

Re: [Owfs-developers] Owserver on pi (zero) using DS18B20 and pullup resistor

2016-09-04 Thread Jan Kandziora
Am 04.09.2016 um 19:08 schrieb Colin Law: > > I have it to 3.3V ok. So 4.7k is ok for 3 wire mode but for parasitic > it should be 1.5k > Yes. > > To summarize then, for parasitic mode I should not need an external > strong pullup and should be able to use just a 1.5k pullup and to > specify >

Re: [Owfs-developers] Owserver on pi (zero) using DS18B20 and pullup resistor

2016-09-04 Thread Colin Law
On 3 September 2016 at 13:04, Jan Kandziora wrote: > Am 03.09.2016 um 10:36 schrieb Colin Law: > ... > 2. You have to put > > dtoverlay=w1-gpio,gpiopin=4 > > or > > dtoverlay=w1-gpio-pullup,gpiopin=4,pullup=5 > > into your Raspberry Pi boot partition config.txt. And of course, the >

Re: [Owfs-developers] Owserver on pi (zero) using DS18B20 and pullup resistor

2016-09-03 Thread Colin Law
On 3 September 2016 at 14:00, Colin Law wrote: > On 3 September 2016 at 13:45, Jan Kandziora wrote: >> Am 03.09.2016 um 14:28 schrieb Colin Law: >>> >>> Many thanks >>> >> I missed one thing: you have to load the w1-gpio kernel module! > > Which I do, I think, by

Re: [Owfs-developers] Owserver on pi (zero) using DS18B20 and pullup resistor

2016-09-03 Thread Jan Kandziora
Am 03.09.2016 um 14:28 schrieb Colin Law: > > Many thanks > I missed one thing: you have to load the w1-gpio kernel module! Kind regards Jan -- ___ Owfs-developers

Re: [Owfs-developers] Owserver on pi (zero) using DS18B20 and pullup resistor

2016-09-03 Thread Colin Law
On 3 September 2016 at 13:04, Jan Kandziora wrote: > Am 03.09.2016 um 10:36 schrieb Colin Law: >> I want to use owserver on a raspberry pi (zero) running Raspbian >> (Jessie) using the method of direct connection to GPIO pins with a >> pullup resistor. Unfortunately I have found a

Re: [Owfs-developers] Owserver on pi (zero) using DS18B20 and pullup resistor

2016-09-03 Thread Jan Kandziora
Am 03.09.2016 um 10:36 schrieb Colin Law: > I want to use owserver on a raspberry pi (zero) running Raspbian > (Jessie) using the method of direct connection to GPIO pins with a > pullup resistor. Unfortunately I have found a fair amount of > conflicting and confusing information on this around