Wakeup every 10sec. (Arduino_LoRa_Simple_GPS.ino)

[schroepfer]

Hello, thanks for your great project and your fast help in the past!

I'm using an Atmega328 with an GPS and your latest _Arduino_LoRa_SimpleGPS.ino with no changes. It works fine, but it wakes up every 10 seconds after sleep, instead of 20 Minutes. (Successfully switch LoRa module in sleep mode) The GPS-Fix is great.

Please can you tell me, what can be wrong?

Regards Juergen

[benner]

Not sure if this the case but actually Arduino/Atmega does multiple sleeps in 8s or 4s to reach total minutes of sleep:

https://github.com/CongducPham/LowCostLoRaGw/blob/master/Arduino/Arduino_LoRa_Simple_GPS/Arduino_LoRa_Simple_GPS.ino#L831

[schroepfer]

i know this, but: in CongDucs program he defines nCycle for this loop, but he never used it, (and there is no loop) like in his other code. unsigned int nCycle = IDLE_PERIOD_SECONDS/LOW_POWER_PERIOD;

But there ist a new variable waiting_t = nextTransmissionTime and a new Control Structure, that i don't understand: if (waiting_t > 8158) { LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF); waiting_t = waiting_t - 8158; ........

[CongducPham]

the new low power control structure is for more accuracy as a sleep time of 8s is actually closest to 8158ms

I actually don't see why your device is waking up every 10s from the sleep loop. I will try to reproduce the error.

regards,

[schroepfer]

Excuse, i found my misstake! My GPS-Switching-Pin is 8, not 7 ! So the GPS never switches off and goes not to sleep. `#define GPS_PIN_POWER

define GPS_PIN_POWER_PIN 7

`

Regards, Juergen