Managed to get it all working with my DS18B20 in parasite mode, instead of
applying 3.3VDC I applied 5VDC though pin P9.7 and using a 1.5k resistor
instead of a 4.7k one.
If I applied the following resistors instead of the 1.5k ones I got the
following readings:
- 4.7k - t=85000
- 10k -
Check out my website tunapiano.info where I spell out in detail the ina
and outs of getting the BBB to read the ds18b20's. Run the SetupPins.sh
scriprt I wrote. That may just make it work or it will at least show you
everything you have set up and what you may be missing. I didn't analyze
I was able to get the sensor showing up (switched + and -... Yeah to
quick), however I'm not able to get correct temperature readings with a new
sensor.
I need to mention that I have the Parasitic version DS18B20+, does that
work with 3.3VDC or do I need to connect it to 5VDC (which the BBB
I was able to get the sensor showing up (switched + and -... Yeah to
quick), however I'm not able to get correct temperature readings with a new
sensor.
I need to mention that I have the Parasitic version DS18B20+, does that
work with 3.3VDC or do I need to connect it to 5VDC (which the BBB
You can use either powered or parasitic modes for One-Wire devices -- there
isn't a distinct device for one mode or the other. The data sheet shows the
DS18B20 can operate down to 3V.
I'm not greatly versed in embedded Linux, nor in the BBB, but I've used
One-Wire devices (including DS18S20s)
On Saturday, August 30, 2014 12:01:18 PM UTC+1, Michaël Vaes wrote:
Hi -
I'm stuck getting my DS18B20 temperature sensor working on my Beaglebone
Black. I installed and loaded the DTC overlay but Im not getting the '28-*'
files in my '/sys/devices/w1_bus_master1/' directory.
The dts
On Sun, Sep 7, 2014 at 4:14 PM, Michaël Vaes vaesmich...@gmail.com wrote:
Is there any way to see the RAW inputs/outputs on a pin?
I would use a logic analyzer to see if the communication is going
well. I have one of this: https://www.saleae.com/ but of an old model
(maybe you still can get
Also testing this on Ubuntu 14.04.1 LTS did not work. Any help is
appreciated!
Thanks,
*Michael*
On Saturday, August 30, 2014 1:01:18 PM UTC+2, Michaël Vaes wrote:
Hi -
I'm stuck getting my DS18B20 temperature sensor working on my Beaglebone
Black. I installed and loaded the DTC overlay
Output when overlay enabled but no devices found.
/sys/devices/w1_bus_master1/w1_master_add: write device
id xx- to add slave
/sys/devices/w1_bus_master1/w1_master_attempts: 61
/sys/devices/w1_bus_master1/w1_master_max_slave_count: 10
Changing the OS to Ubuntu did not change the behaviour.
Any help is appreciated on debugging this.
Thanks!
*Michael*
On Saturday, August 30, 2014 1:01:18 PM UTC+2, Michaël Vaes wrote:
Hi -
I'm stuck getting my DS18B20 temperature sensor working on my Beaglebone
Black. I installed and
Hi Michaël,
Are you using 18ohm pull up resistor as your wiring diagram states? If so
this resistor is too low for pull up; both bone and sensor will have to
sink a lot of current to drive the line down.
See this discussion here:
https://groups.google.com/forum/#!topic/beaglebone/dosKmEE7xso
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