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+--- Thread: SH-RPi V1 OP 3RPI 4 cant get 1W to work (/showthread.php?tid=4714)
SH-RPi V1 OP 3RPI 4 cant get 1W to work - leif_klasson@hotmail.com - 2023-06-21
Hi, I have an Rpi 4with Openplotter 3 installed. Tested and verified that it worked with 1W connection for 2 temp sensors, type DS18B20.
Worked as expected.
Then after installation of SH-Rpi hat V1 from hatlab, I can't get it to work.
I also have some ADS1115 on I2C, and these ones work as expected.
GPIO and 1W is enabled according to startup check. I have tried with removed the old 1W connections, but no new are popping up as before, and the old ones aren't working any more.
Any ideas?
/Leif
RE: SH-RPi V1 OP 3RPI 4 cant get 1W to work - holgerw - 2023-06-22
you need to selectr an gpio pin for onewire,
this is sepcified at booting pi via an txt-line sitting in /boot/config.txt.
normaly this is pin 4.
check this or post your /boot/config.txt and your gpio pin where your onewire data pin is connected.
we will able to help you out quickliy with this information.
RE: SH-RPi V1 OP 3RPI 4 cant get 1W to work - leif_klasson@hotmail.com - 2023-06-22
Hi, first part was already in config.txt, overlay for 1W:
dtoverlay=w1-gpio
And in Openplotter setting the default are pin 4 as it says. I added it anyway to config:
dtoverlay=w1-gpio,gpiopin=4
But same result. I now remembered that I have forgot the 4,7 kohm pullup, but it was working before without that.
When trying refresh in Openplotter GPIO settings, it also says GPIO disabled?
But startup check is ok?
/Leif
RE: SH-RPi V1 OP 3RPI 4 cant get 1W to work - holgerw - 2023-06-22
Is it enabled in raspi-config?
Get your Sensors gnd, data and +3.3 Volt?
Is there an Resistor of 2…5kohm between data and + 3.3 Volt?
RE: SH-RPi V1 OP 3RPI 4 cant get 1W to work - Sailoog - 2023-06-23
It will not work without the pull up resistor.
You should never edit /boot/config.txt manually in openplotter.
RE: SH-RPi V1 OP 3RPI 4 cant get 1W to work - holgerw - 2023-06-23
If you can‘t get it working, for his sailorHat ask Matti :-)
RE: SH-RPi V1 OP 3RPI 4 cant get 1W to work - leif_klasson@hotmail.com - 2023-07-25
Thanks for all help. After added a 4,7 kohm resistor, it worked like a charm the two weeks we where out.
Last thing to fix is the N2K connection, will check with Mr HatLab ;-).
/Leif