💬 Simple compact RS485 node (ATmega328 + MAX485)

[openhardware.io]

https://www.openhardware.io/view/692/Simple-compact-RS485-node-ATmega328-MAX485

[cabat]

UPDATE: Tested in hardware now.

[cabat]

Example of usage RS485 node: Light control module

[cabat]

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.

[fani625]

Can you upload Pick And Place list and .brd file

[dzjr]

it is also possible to order an assembled (RS-485) PCB, especially the SMD components.

Please let me know!

[cabat]

Soon a new revision of the board with the possibility of installing memory for OTA and fix some components footprints will be ready.

[dzjr]

@cabat then i will wait

[cabat]

@dzjr I can upload new revision, but it still not tested in hardware, only ready to place order for PCB!

[dzjr]

@cabat
sorry I'm new to ordering PCBs hence maybe the stupid question ..
If I order the PCB do I get the separate PCB without SMD components?
or are the SMD components already on the PCB?

Soldering "normal" components is going to work, and I also have experience with it, but SMD components will be a new challenge, not that I don't want to, but I don't have the right stuff (yet).

[cabat]

@dzjr Ordering PCBs you will get only pcb, without components (no matter - SMD or TH). You may use PCB assebling service like JLCPCB or other, or you may solder SMD components yourself, it is not so hard, as you can think.

[dzjr]

@cabat Thanks,

i will give it a try!

[dzjr]

@cabat I have ordered four pcb's and the other components (resistors, capacitors, max485 and voltage regulator in china) and the ATmega at a german webshop.

do you have some advice for smd soldering?

[cabat]

@dzjr I am using simple solder station like 936 with 900M-T-I iron tip, first solder the MCU and pin-headers, programm with USBASP using pads SCK, MISO, MOSI, RES, VCC ang GND, then solder other components (MAX485, resistors and capacitors).

[dzjr]

@cabat unfortunately i am still waiting for the pcb's so i could try it unfortunately ...
Still listed as "In Fabrication" hope it comes soon ...

in the meantime I have received all parts

[cabat]

@dzjr I am ordered a new revision of this PCB at 2020.04.13, and the order status is "in fabrication" too, don't worry.

[cabat]

@dzjr This is terrible, but yesterday I received a message from PSBs.io that my order from 04/13/2020 is only sent ..

[dzjr]

@cabat

The PCB's i orderd are also send friday.

So i hope is came this week!

[dzjr]

@cabat The PCBs have been delivered !!

only now the weather is very nice here, so I don't feel like hanging out in the workshop ...

I'll let you know when I'm ready!

[cabat]

@dzjr Congrats! My works on hobby is not hard because of we have nice weather too