Wifi LoRa v4 deep sleep current

#1

Hi!

Newbie here! I’m trying to reach μA deep sleep current on my Wifi Lora V4 card since it will be used off-grid and send data occasionally (once an hour approx.). However, despite my efforts the lowest I’ve managed to reach is 1,8mA (which is with a very minimal code which puts the ESP32 in deep sleep basically…).

Could someone help me, where should I begin to be able to lower the deep sleep power consumption?

NB: I power the card through the 2p battery connection with an 18650 battery.

BR
niklas

#2

Hi

Did you put all pins as deactivated ? Did your out Lora module to sleep?

#3

I actually managed, yesterday, to get down to 40microamp in deep sleep mode with a few modifications. Thanks anyway!

#4

Could you please share what exactly you did? I’m in the same situation and can’t get below about 715 uA. I’d LOVE to get to less than 100 :slight_smile:

#5

Sure! I’m not sure how to paste it in an indented, neat way but here’s the code!

#include <Arduino.h>
#include <RadioLib.h>
#include "esp_sleep.h"
#include "driver/gpio.h"

// === Heltec V4 pinout (officiellt) ===
#define RADIO_NSS   8
#define RADIO_RST   12
#define RADIO_BUSY  13
#define RADIO_DIO1  14

#define VEXT_PIN    36
#define LED_PIN     35

SX1262 radio = new Module(RADIO_NSS, RADIO_DIO1, RADIO_RST, RADIO_BUSY);

void VextOFF() {
  pinMode(VEXT_PIN, OUTPUT);
  digitalWrite(VEXT_PIN, HIGH);   // HIGH = OFF on Heltec
}

void ledOFF() {
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, HIGH);    // HIGH = OFF on Heltec
}

void go_to_sleep() {
  ledOFF();
  VextOFF();

  // Put SX1262 into sleep
  radio.sleep();

  // Keep NSS high and hold it during deep sleep
  pinMode(RADIO_NSS, OUTPUT);
  digitalWrite(RADIO_NSS, HIGH);
  gpio_hold_en((gpio_num_t)RADIO_NSS);
  gpio_deep_sleep_hold_en();

  Serial.println("GOING TO SLEEP NOW");
  Serial.flush();

  esp_deep_sleep_start();
}

void setup() {
  Serial.begin(115200);
  delay(2000);

  Serial.println("Init radio...");

  SPI.begin(9, 11, 10); // SCK, MISO, MOSI Heltec V4
  int state = radio.begin();

  if (state != RADIOLIB_ERR_NONE) {
    Serial.println("Radio init failed!");
  } else {
    Serial.println("Radio OK");
  }

  delay(1000);
  go_to_sleep();
}

void loop() {}
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