Dragino mini JPはCPUにATmega328Pを使っていてArduino UNOと互換性を持っています。
Dragino mini JPをLoRaWAN端末として使う場合 LMICライブラリを使いますが
Dragino mini JP と LMICライブラリの組み合わせで Sleepさせながらの間欠動作の実験を行いました。
先ずは、こちらのページから
Lightweight low power library for Arduino
をダウンロードして Arduino IDE に追加してください。
元々次の送信時間を設定していた行、125行目をコメントアウトして
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// os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send); |
以下の4行を追加してください。
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for (int i=0; i<SLEEP_MIN; i++) { // Use library from https://github.com/rocketscream/Low-Power LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF); } do_send(&sendjob); |
なお [SLEEP_MIN]はスリープさせたい時間を LowPower.powerDown()関数の第一引数に与えた時間で割った値となります。
これはSleep時間に設定できるのが最大8秒なので、それ以上Sleepさせたいときはこのように何回もSleepを繰り返させます。
今回の例では SLEEP_MIN を 37 としていますので
スリープ時間は 8s × 37 = 296s(約5分) となります。
時間設定は
(a) SLEEP_15MS – 15 ms sleep
(b) SLEEP_30MS – 30 ms sleep
(c) SLEEP_60MS – 60 ms sleep
(d) SLEEP_120MS – 120 ms sleep
(e) SLEEP_250MS – 250 ms sleep
(f) SLEEP_500MS – 500 ms sleep
(g) SLEEP_1S – 1 s sleep
(h) SLEEP_2S – 2 s sleep
(i) SLEEP_4S – 4 s sleep
(j) SLEEP_8S – 8 s sleep
(k) SLEEP_FOREVER – WDT以外での起動
これらの値が選択できます。
これで LMICライブラリを使った Dragino mini JP の間欠動作を行うことが出来ます。
ただしArduinoをSleepさせているだけで LoRaチップを低消費電力化しているわけではありません。
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/******************************************************************************* * 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. *H * This example sends a valid LoRaWAN packet with payload "Hello, * world!", 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). * * Change DEVADDR to a unique address! * See http://thethingsnetwork.org/wiki/AddressSpace * * Do not forget to define the radio type correctly in config.h. * *******************************************************************************/ #include <lmic.h> #include <hal/hal.h> #include <SPI.h> #include <LowPower.h> #define SLEEP_MIN 37 // LoRaWAN NwkSKey, network session key // This is the default Semtech key, which is used by the prototype TTN // network initially. //ttn static const PROGMEM u1_t NWKSKEY[16] = { 0xBE, 0xC4, 0x99, 0xC6, 0x9E, 0x9C, 0x93, 0x9E, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x03 }; // LoRaWAN AppSKey, application session key // This is the default Semtech key, which is used by the prototype TTN // network initially. //ttn static const u1_t PROGMEM APPSKEY[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; // LoRaWAN end-device address (DevAddr) // See http://thethingsnetwork.org/wiki/AddressSpace //ttn static const u4_t DEVADDR = 0x76FFFF03; // 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 uint8_t mydata[16] = " "; static osjob_t initjob,sendjob,blinkjob; static int send_counter = 0; // Schedule TX every this many seconds (might become longer due to duty // cycle limitations). const unsigned TX_INTERVAL = 1*60; // 1分 // Pin mapping const lmic_pinmap lmic_pins = { .nss = 10, .rxtx = LMIC_UNUSED_PIN, .rst = 9, .dio = {2, 6, 7}, }; void do_send(osjob_t* j){ // Check if there is not a current TX/RX job running if (LMIC.opmode & OP_TXRXPEND) { Serial.println("OP_TXRXPEND, not sending"); } else { send_counter++; sprintf(mydata,"%06d",send_counter); // Prepare upstream data transmission at the next possible time. LMIC_setTxData2(1, mydata, sizeof(mydata)-1, 0); Serial.println("Packet queued"); Serial.println(LMIC.freq); } // Next TX is scheduled after TX_COMPLETE event. } void onEvent (ev_t ev) { Serial.print(os_getTime()); Serial.print(": "); Serial.println(ev); switch(ev) { case EV_SCAN_TIMEOUT: Serial.println("EV_SCAN_TIMEOUT"); break; case EV_BEACON_FOUND: Serial.println("EV_BEACON_FOUND"); break; case EV_BEACON_MISSED: Serial.println("EV_BEACON_MISSED"); break; case EV_BEACON_TRACKED: Serial.println("EV_BEACON_TRACKED"); break; case EV_JOINING: Serial.println("EV_JOINING"); break; case EV_JOINED: Serial.println("EV_JOINED"); break; case EV_RFU1: Serial.println("EV_RFU1"); break; case EV_JOIN_FAILED: Serial.println("EV_JOIN_FAILED"); break; case EV_REJOIN_FAILED: Serial.println("EV_REJOIN_FAILED"); break; case EV_TXCOMPLETE: Serial.println("EV_TXCOMPLETE (includes waiting for RX windows)"); if(LMIC.dataLen) { // data received in rx slot after tx Serial.print("Data Received: "); Serial.write(LMIC.frame+LMIC.dataBeg, LMIC.dataLen); Serial.println(); } // Schedule next transmission // os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send); for (int i=0; i<SLEEP_MIN; i++) { // Use library from https://github.com/rocketscream/Low-Power LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF); } do_send(&sendjob); break; case EV_LOST_TSYNC: Serial.println("EV_LOST_TSYNC"); break; case EV_RESET: Serial.println("EV_RESET"); break; case EV_RXCOMPLETE: // data received in ping slot Serial.println("EV_RXCOMPLETE"); break; case EV_LINK_DEAD: Serial.println("EV_LINK_DEAD"); break; case EV_LINK_ALIVE: Serial.println("EV_LINK_ALIVE"); break; default: Serial.println("Unknown event"); break; } } void setup() { Serial.begin(9600); while(!Serial); Serial.println("Starting"); #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(); //LMIC_setClockError(MAX_CLOCK_ERROR * 1/100); // 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 // Disable link check validation LMIC_setLinkCheckMode(0); // TTN uses SF9 for its RX2 window. 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); } void loop() { os_runloop_once(); } |
