HTCC-AB02A LoRa deep sleep

#1

I am using the HTCC-AB02A to send LoRa data. Then I put the board into deep sleep.

After the command ‘Radio.Sleep( );’ I have to pause for 3 seconds, otherwise the command ‘lowPowerHandler();’ will not work and the board will not go into deep sleep.

Is there any way around the problem?

code:

/* Heltec Automation send communication test example
 *
 * Function:
 * 1. Send data from a CubeCell device over hardware 
 * 
 * 
 * this project also realess in GitHub:
 * https://github.com/HelTecAutomation/ASR650x-Arduino
 * */

#include "LoRaWan_APP.h"
#include "Arduino.h"

/*
 * set LoraWan_RGB to 1,the RGB active in loraWan
 * RGB red means sending;
 * RGB green means received done;
 */
#ifndef LoraWan_RGB
#define LoraWan_RGB 0
#endif

#define RF_FREQUENCY                                868000000 // Hz

#define TX_OUTPUT_POWER                             14        // dBm

#define LORA_BANDWIDTH                              0         // [0: 125 kHz,
                                                              //  1: 250 kHz,
                                                              //  2: 500 kHz,
                                                              //  3: Reserved]
#define LORA_SPREADING_FACTOR                       7         // [SF7..SF12]
#define LORA_CODINGRATE                             1         // [1: 4/5,
                                                              //  2: 4/6,
                                                              //  3: 4/7,
                                                              //  4: 4/8]
#define LORA_PREAMBLE_LENGTH                        8         // Same for Tx and Rx
#define LORA_SYMBOL_TIMEOUT                         0         // Symbols
#define LORA_FIX_LENGTH_PAYLOAD_ON                  false
#define LORA_IQ_INVERSION_ON                        false


#define RX_TIMEOUT_VALUE                            1000
#define BUFFER_SIZE                                 30 // Define the payload size here

#define SLEEP_TIME 3600000 // 1 hour
static TimerEvent_t DeepSleep;


char txPacket[BUFFER_SIZE];

static RadioEvents_t RadioEvents;



void setup() {

  // Serial monitor at 115200 baud
  Serial.begin(115200);

  // Pin
  pinMode(Vext,OUTPUT);

  // init LoRa module
  Radio.Init( &RadioEvents );
  Radio.SetChannel( RF_FREQUENCY );
  Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH,
                                 LORA_SPREADING_FACTOR, LORA_CODINGRATE,
                                 LORA_PREAMBLE_LENGTH, LORA_FIX_LENGTH_PAYLOAD_ON,
                                 true, 0, 0, LORA_IQ_INVERSION_ON, 3000 ); 
  Radio.SetSyncWord(0x12);

}

void loop() {
  
  // Battery
  uint16_t voltage = getBatteryVoltage();
  sprintf(txPacket,"%s","/Zisterne/Batterie=");
	sprintf(txPacket+strlen(txPacket),"%d",voltage); 
  Serial.printf("\rsending packet \"%s\" , length %d\r\n",txPacket, strlen(txPacket));
  Radio.Send( (uint8_t *)txPacket, strlen(txPacket) ); // send the package out	
  
  // Sensor
  digitalWrite(Vext, LOW); // sensor power on
  delay(100);
  uint16_t level=analogRead(ADC2); 
  digitalWrite(Vext, HIGH);  // sensor power off
  sprintf(txPacket,"%s","/Zisterne/Level=");
  sprintf(txPacket+strlen(txPacket),"%d",level); 
  Serial.printf("\rsending packet \"%s\" , length %d\r\n",txPacket, strlen(txPacket));
  Radio.Send( (uint8_t *)txPacket, strlen(txPacket) ); // send the package out  
 
  Radio.Sleep( ); // aktivate sleep for LORA
 
  // go back to deep sleep mode
  TimerSetValue( &DeepSleep, SLEEP_TIME );
  TimerStart( &DeepSleep );
  
  delay(3000); //???????

  lowPowerHandler();

 
}