Lora sx1278 01 spi hot

Using Arduino General Electronics
1

image
image934×541 41.3 KB

i use ld1085 , power 12V down 3.3V 3A
for atmega328pau, dwm1000 lora sx1278 01
when the circuit runs, the lora is hot,
without lora, the circuit with atmega328 and dwm1000 still works normally
thanks

2

Is it the Lora that is hot or the three terminal regulator. With 9V drop and 3A it will be dissipating 27W. That is a lot of power to lose.

3

Wiring problem, and/or the radio is ruined.

4

Using a linear regulator is a very bad choice (nowadays), not only wasting most of the power, but creating a heat problem whatever it is powering.

5

Hi, @hodefiant

Can you post a complete schematic and some images of your project so we can see your component layout?

How much current does your project consume at 12V input, with and without the Lora connected.

Thanks.. Tom.... :smiley: :+1: :coffee: :australia:

1 Like
6

I think that the 3A is the regulator current rating, we need @hodefiant to actually measure the input current to find the power dissipation.

Tom... :smiley: :+1: :coffee: :australia:

7

Ahhh! That makes sense.

8

However you use it, proportionally the power wastage with a linear regulator is quite inappropriate.

9

hi guys

10

An Atmega328 on a 3.3volt supply shouldn't be clocked at 16Mhz.

Why drop the LoRa supply to 2.6volt?
Leo..

11

I'm using 8Mhz

12

Hi,
Can you please produce a proper connected schematic, so signal and power flow are easy to follow.
Using net names may be good for PCB manufacture, but hopeless when it comes to a circuit you can use to troubleshoot problems.

Sorry but troubleshooting is my profession and good, well layed out schematics can make a world of difference.

Tom... :smiley: :+1: :coffee: :australia:

13

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.