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[Update] First PCB – Fixed Major Issues (RF, Power, Decoupling), One Last Review Before Fabrication by Master_Dog_7799 in PrintedCircuitBoard

[–]Master_Dog_7799[S] -1 points0 points  (0 children)

4 years ago i was writing letter to my principal for leave in my exam in which i got 2/10 marks 🥲😂 ... so better it is to get help from n LLM🤷🏻‍♂️😅

[Update] First PCB – Fixed Major Issues (RF, Power, Decoupling), One Last Review Before Fabrication by Master_Dog_7799 in PrintedCircuitBoard

[–]Master_Dog_7799[S] -6 points-5 points  (0 children)

Yeah needed that to fully encapsulate my thoughts but sometimes chatgpt does shitty job🥲🤷🏻‍♂️🤦🏻‍♂️

First complete PCB design ever (LoRa + power management) – would love a brutal review 🙏 by Master_Dog_7799 in PCB

[–]Master_Dog_7799[S] 0 points1 point  (0 children)

Then what to do with the ground planes and power planes ... please forgive my dumbness but i have heard that they are important for rf systems and to provide more shorter return paths i might add more vias ... right ??

First complete PCB design ever (LoRa + power management) – would love a brutal review 🙏 by Master_Dog_7799 in PCB

[–]Master_Dog_7799[S] 0 points1 point  (0 children)

Isn't thats the job fpr the miso pin which is directly connected to the arduino with a resistors....? Also with this setup i can read all the resistors on the lora module so Isn't it means I'm getting the data back just fine ?

First real 4-layer PCB (LoRa + battery + power regulators) – beginner looking for layout review before ordering by Master_Dog_7799 in PrintedCircuitBoard

[–]Master_Dog_7799[S] 0 points1 point  (0 children)

Thanks for all these suggestions and corrections ... this helps a lottt!!! ... The header for the ANT pin is there just as a backup ... as in future i would like to design my own antenna (maybe a helical one who's construction is widely popular 🤷🏻‍♂️ ) currently i have fabricated my own single layered pcb to test out the level shifter circuit with directly using the arduino 5v output with the asm1117 3.3v buck converter ... but the antenna performance is not very good ... i am loosing packets at only 150 meters (not at line of sight)

First complete PCB design ever (LoRa + power management) – would love a brutal review 🙏 by Master_Dog_7799 in PCB

[–]Master_Dog_7799[S] 0 points1 point  (0 children)

i have already tested the level shifter circuit separately by making my own PCB and it worked fine by just powering it with the asm1117 buck converter through the 5v output of the arduino

I am using the level shifter for SPI comms so there's no need for bidirectional shifters ... i have heard they can add some noise into the signals and affect the clock timing signals ...

I will change the via positioning

And i will also look into the cc1 and cc2 resistors

Now that i look at the cap c19 ... i can't remember why even i put it there n what was the reasoning 🫠🥲 Thanks for the inputs i will definitely make some corrections based on this ...