Attention !!! Possible unstable work node with LP2950 LDO!

I am don't understand yet, but one of the node don't work by powering of 12V using LP2950CZ-50 LDO.
Temporary i am using AMS1117 on this node, and order HT7550-1 for testing.

Example of usage RS485 node: Light control module

I am use switching DC-DC the same as you to get 5V from 12V and LDO XC6206 to power NRF24 module - all work good.

As i see, two first module is impulse, but third - linear?

@feanor-anglin said in Newbie wants to do everything wired:

Star topology is not recommended to use with RS485, but it is not that it certainly won't work. You have to test it.

I know about it, but I hope that with a speed of 9600 and a small cable length it will work ..

@tweaker still not - not enough time to assemble additional nodes..

I have encountered problems that are still not clear to me when assembling the second board - it does not want to connect to the gateway.
I checked everything that is possible, but I haven’t found the reasons yet..
I will plan To assemble one more test node ..

@tweaker said in Newbie wants to do everything wired:

@cabat : Thanks for sharing. When do you plan to connect more nodes? How long will be the cables?

In fact now i have 2 nodes, but one of then only for testing purpose, sending temp every 15 seconds.
The cable is about 10-15 meters.

@tweaker
I'm also plan to use star topology, but still i build just one node
Use 9600 baud rate, and i don't have delay on my experience on this day.

@feanor-anglin said in Newbie wants to do everything wired:

If you like it, please feel free to contact me. We've made some significant progress, which is not published yet.

I am also intresting in implementation of RS485 in my MySensors network, and i like yor hardware and use some of your ideas in my project Simple compact RS485 node (ATmega328 + MAX485) ,

UPDATE: Tested in hardware now.