the TTN stick gets its power from the USB bus which is 5 V (this node has no battery connection)
32U4 the (leonardo) processor operates on 5 v but the LoRa module RN2483 on 3v3.
so the stepdown is to make 3v3 from the 5v and the level shifterr is to ‘level’ the UART signals in the final node I don’t use the fancy buck/boost module but a simple stepdown converter.
there will be some more things on the protoboard like an rgb led and a reset button (need that for programming the thing) my problem is that I get an idea and start immediate with it… that’s why all my tables are full
Your workbench must be a ton of fun for a tinkerer.
So a level switcher is just for data but not for actual power? I thought you could a level shifter to do 5v -> 3v3 to also drive/power things. Not at all or only limited?
edit. Read up on it, looks like it’s indeed only for data.
If I’m not mistaken, it has to do with the tolerance of the cristal inside, they improved that.
The famous’cold’ problem, and it’s getting winter here in Holland, so I didn’t want to use my ‘old’ stock.
But my outdoor testnode is running on a older rn2483 version and still everything is ok… waiting for minus 5
Looking at the code it wakes every 8 seconds to then go back to sleep on a loop for x minutes, as the Rocket device works off a 1.5v battery I assume its using a boost converter on the board too?
I’m assuming this approach is no good on the cheap Lora324u boards due to the lack of memory space
No this works different then the widely used 'counting loops for timing.
The RN2483 is brought to sleep ttn.sleep(SLEEP_PERIOD); and wakes up the 328p with an interrupt attachInterrupt (digitalPinToInterrupt(2), awake, LOW);
The max sleep period is determined by the Microchip module and is 49.7 days.
This works only with the RN2483 and the TTN library and off course the LoW Power lib from the same company
