Hello, I have a BsFrance Lora32u4 II card, I measure temperature / humidity (DHT22) and battery level through cayenne, the program works fine but I want to minimize the current consumption, but I can not get down to 2mA.
I have tried with the LowPower.h library to sleep the Mega32u4 and also LMIC_shutdown () to sleep the RFM95 radio.
Someone with the LORA32u4 card has achieved a few uA consumption?
Thank you.
Greetings.
/*******************************************************************************
* Copyright (c) 2015 Thomas Telkamp and Matthijs Kooijman
*
* Permission is hereby granted, free of charge, to anyone
* obtaining a copy of this document and accompanying files,
* to do whatever they want with them without any restriction,
* including, but not limited to, copying, modification and redistribution.
* NO WARRANTY OF ANY KIND IS PROVIDED.
*
* This example sends a valid LoRaWAN packet with static payload,
* using frequency and encryption settings matching those of
* the (early prototype version of) The Things Network.
*
* Note: LoRaWAN per sub-band duty-cycle limitation is enforced (1% in g1,
* 0.1% in g2).
*
* ToDo:
* - set NWKSKEY (value from staging.thethingsnetwork.com)
* - set APPKSKEY (value from staging.thethingsnetwork.com)
* - set DEVADDR (value from staging.thethingsnetwork.com)
* - optionally comment #define DEBUG
* - optionally comment #define SLEEP
* - set TX_INTERVAL in seconds
* - change mydata to another (small) static text
*
*******************************************************************************/
#include <lmic.h>
#include <hal/hal.h>
#include <SPI.h>
#include <DHT.h>
#include <CayenneLPP.h>
#define MAX_SIZE 200 // depends on spreading factor and frequency used
CayenneLPP Payload(MAX_SIZE);
#define VBATPIN A9
#define DHTPIN 10 // Pin which is connected to the DHT sensor.
#define DHTTYPE DHT22 // DHT 22
DHT dht(DHTPIN, DHTTYPE);
unsigned long count;
// LoRaWAN NwkSKey, your network session key, 16 bytes (from staging.thethingsnetwork.org)
static const PROGMEM u1_t NWKSKEY[16] = { ****************** };
// LoRaWAN AppSKey, application session key, 16 bytes (from staging.thethingsnetwork.org)
static const u1_t PROGMEM APPSKEY[16] = { ****************** };
// LoRaWAN end-device address (DevAddr), ie 0x91B375AC (from staging.thethingsnetwork.org)
static const u4_t DEVADDR = { 0x********}; // <-- Change this address for every node!
// show debug statements; comment next line to disable debug statements
#define DEBUG
// use low power sleep; comment next line to not use low power sleep
#define SLEEP
// Schedule TX every this many seconds (might become longer due to duty
// cycle limitations).
const unsigned TX_INTERVAL = 1800;
// static text, you can replace T
static uint8_t mydata[8] = { 0x03, 0x67, 0x01, 0x10, 0x05, 0x67, 0x00, 0xFF };
#ifdef SLEEP
#include "LowPower.h"
bool next = false;
#endif
// These callbacks are only used in over-the-air activation, so they are
// left empty here (we cannot leave them out completely unless
// DISABLE_JOIN is set in config.h, otherwise the linker will complain).
void os_getArtEui (u1_t* buf) { }
void os_getDevEui (u1_t* buf) { }
void os_getDevKey (u1_t* buf) { }
static osjob_t sendjob;
// Pin mapping
const lmic_pinmap lmic_pins = {
.nss = 8,
.rxtx = LMIC_UNUSED_PIN,
.rst = 4,
.dio = {7,6,LMIC_UNUSED_PIN},
};
void onEvent (ev_t ev) {
#ifdef DEBUG
Serial.println(F("Enter onEvent"));
#endif
switch(ev) {
case EV_SCAN_TIMEOUT:
Serial.println(F("EV_SCAN_TIMEOUT"));
break;
case EV_BEACON_FOUND:
Serial.println(F("EV_BEACON_FOUND"));
break;
case EV_BEACON_MISSED:
Serial.println(F("EV_BEACON_MISSED"));
break;
case EV_BEACON_TRACKED:
Serial.println(F("EV_BEACON_TRACKED"));
break;
case EV_JOINING:
Serial.println(F("EV_JOINING"));
break;
case EV_JOINED:
Serial.println(F("EV_JOINED"));
break;
case EV_RFU1:
Serial.println(F("EV_RFU1"));
break;
case EV_JOIN_FAILED:
Serial.println(F("EV_JOIN_FAILED"));
break;
case EV_REJOIN_FAILED:
Serial.println(F("EV_REJOIN_FAILED"));
break;
case EV_TXCOMPLETE:
Serial.println(F("EV_TXCOMPLETE (includes waiting for RX windows)"));
if(LMIC.dataLen) {
// data received in rx slot after tx
Serial.print(F("Data Received: "));
Serial.write(LMIC.frame+LMIC.dataBeg, LMIC.dataLen);
Serial.println();
}
// Schedule next transmission
#ifndef SLEEP
os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send);
#else
next = true;
#endif
break;
case EV_LOST_TSYNC:
Serial.println(F("EV_LOST_TSYNC"));
break;
case EV_RESET:
Serial.println(F("EV_RESET"));
break;
case EV_RXCOMPLETE:
// data received in ping slot
Serial.println(F("EV_RXCOMPLETE"));
break;
case EV_LINK_DEAD:
Serial.println(F("EV_LINK_DEAD"));
break;
case EV_LINK_ALIVE:
Serial.println(F("EV_LINK_ALIVE"));
break;
default:
Serial.println(F("Unknown event"));
break;
}
#ifdef DEBUG
Serial.println(F("Leave onEvent"));
#endif
}
void do_send(osjob_t* j){
// Check if there is not a current TX/RX job running
if (LMIC.opmode & OP_TXRXPEND) {
Serial.println(F("OP_TXRXPEND, not sending"));
} else {
// Prepare upstream data transmission at the next possible time.
Payload.reset();
// Get temperature event and print its value.
int temp = dht.readTemperature(false);
if (isnan(temp)) {
Serial.println(F("Error reading temperature!"));
}
else {
Serial.print(F("Temperature: "));
Serial.print(temp);
Serial.println(F(" *C"));
}
// Get humidity event and print its value.
int humidity = dht.readHumidity();
if (isnan(humidity)) {
Serial.println("Error reading humidity!");
}
else {
Serial.print(F("Humidity: "));
Serial.print(humidity);
Serial.println(F("%"));
}
float measuredvbat = analogRead(VBATPIN);
measuredvbat *= 2; // we divided by 2, so multiply back
measuredvbat *= 3.3; // Multiply by 3.3V, our reference voltage
measuredvbat /= 1024; // convert to voltage
Serial.print("VBat: " ); Serial.println(measuredvbat);
Payload.addTemperature(0, temp);
Payload.addRelativeHumidity(1, humidity);
Payload.addAnalogInput(2, measuredvbat);
LMIC_setTxData2(1, Payload.getBuffer(), Payload.getSize(), 0);
Serial.println(F("Packet queued"));
// Next TX is scheduled after TX_COMPLETE event.
}
}
//-------------------------------------------------------SETUP-----------------------------------------------------
void setup() {
delay(2500);
Serial.begin(115200);
Serial.println(F("Enter setup"));
//FreqCount.begin(1000);
#ifdef VCC_ENABLE
// For Pinoccio Scout boards
pinMode(VCC_ENABLE, OUTPUT);
digitalWrite(VCC_ENABLE, HIGH);
delay(1000);
#endif
// LMIC init
os_init();
// Reset the MAC state. Session and pending data transfers will be discarded.
LMIC_reset();
// Set static session parameters. Instead of dynamically establishing a session
// by joining the network, precomputed session parameters are be provided.
#ifdef PROGMEM
// On AVR, these values are stored in flash and only copied to RAM
// once. Copy them to a temporary buffer here, LMIC_setSession will
// copy them into a buffer of its own again.
uint8_t appskey[sizeof(APPSKEY)];
uint8_t nwkskey[sizeof(NWKSKEY)];
memcpy_P(appskey, APPSKEY, sizeof(APPSKEY));
memcpy_P(nwkskey, NWKSKEY, sizeof(NWKSKEY));
LMIC_setSession (0x1, DEVADDR, nwkskey, appskey);
#else
// If not running an AVR with PROGMEM, just use the arrays directly
LMIC_setSession (0x1, DEVADDR, NWKSKEY, APPSKEY);
#endif
// Set up the channels used by the Things Network, which corresponds
// to the defaults of most gateways. Without this, only three base
// channels from the LoRaWAN specification are used, which certainly
// works, so it is good for debugging, but can overload those
// frequencies, so be sure to configure the full frequency range of
// your network here (unless your network autoconfigures them).
// Setting up channels should happen after LMIC_setSession, as that
// configures the minimal channel set.
// LMIC_setupChannel(0, 903900000, DR_RANGE_MAP(DR_SF10, DR_SF7), BAND_CENTI); // g-band
// LMIC_setupChannel(1, 904100000, DR_RANGE_MAP(DR_SF10, DR_SF7), BAND_CENTI); // g-band
// LMIC_setupChannel(2, 904300000, DR_RANGE_MAP(DR_SF10, DR_SF7), BAND_CENTI); // g-band
// LMIC_setupChannel(3, 904500000, DR_RANGE_MAP(DR_SF10, DR_SF7), BAND_CENTI); // g-band
// LMIC_setupChannel(4, 904700000, DR_RANGE_MAP(DR_SF10, DR_SF7), BAND_CENTI); // g-band
// LMIC_setupChannel(5, 904900000, DR_RANGE_MAP(DR_SF10, DR_SF7), BAND_CENTI); // g-band
// LMIC_setupChannel(6, 905100000, DR_RANGE_MAP(DR_SF10, DR_SF7), BAND_CENTI); // g-band
// LMIC_setupChannel(7, 905300000, DR_RANGE_MAP(DR_SF10, DR_SF7), BAND_CENTI); // g-band
// LMIC_setupChannel(8, 904600000, DR_RANGE_MAP(DR_SF8, DR_SF8), BAND_CENTI); // g2-band
// TTN defines an additional channel at 869.525Mhz using SF9 for class B
// devices' ping slots. LMIC does not have an easy way to define set this
// frequency and support for class B is spotty and untested, so this
// frequency is not configured here.
// Disable link check validation
LMIC_setLinkCheckMode(0);
LMIC_setAdrMode(false);
LMIC.dn2Dr = DR_SF9;
// Set data rate and transmit power (note: txpow seems to be ignored by the library)
LMIC_setDrTxpow(DR_SF7,14);
// Start job
do_send(&sendjob);
#ifdef DEBUG
Serial.println(F("Leave setup"));
#endif
}
//---------------------------------------------------------LOOP--------------------------------------------------
void loop() {
#ifndef SLEEP
os_runloop_once();
#else
extern volatile unsigned long timer0_overflow_count;
if (next == false) {
os_runloop_once();
} else {
int sleepcycles = TX_INTERVAL / 8; // calculate the number of sleepcycles (8s) given the TX_INTERVAL
#ifdef DEBUG
Serial.print(F("Enter sleeping for "));
Serial.print(sleepcycles);
Serial.println(F(" cycles of 8 seconds"));
#endif
Serial.flush(); // give the serial print chance to complete
delay(1000);
//LMIC_shutdown();
for (int i=0; i<sleepcycles; i++) {
// Enter power down state for 8 s with ADC and BOD module disabled
LMIC_shutdown();
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
//LowPower.idle(SLEEP_8S, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_OFF, SPI_OFF, USART0_OFF, TWI_OFF);
// LMIC uses micros() to keep track of the duty cycle, so
// hack timer0_overflow for a rude adjustment:
cli();
timer0_overflow_count+= 8 * 64 * clockCyclesPerMicrosecond();
sei();
}
//os_init();
#ifdef DEBUG
Serial.println(F("Sleep complete"));
#endif
next = false;
// Start job
do_send(&sendjob);
}
#endif
}