We have seen how this device (E32 UART LoRa based on popular SX1276/SX1278 Wireless Modules ) manages power saving, but If we use power saving only for the e32 the microcontroller continue to rest active, but we can use AUX pin to resolve this problem.
You can find module here AliExpress (433MHz 5Km) - AliExpress (433MHz 8Km) - AliExpress (433MHz 16Km) - AliExpress (868MHz 915MHz 5.5Km) - AliExpress (868MHz 915MHz 8Km)
If you have trouble like freeze device, you must put a pull-up 4.7k resistor or better connect to the device AUX pin.
First we must change some connection from the original connection schema, because in the original connection schema AUX pin isn’t connected to an interrupted pin, we are going to put AUX pin to pin 3 of Arduino, and shift all other pins.
So the new connection schema become like so:
Now with AUX on interrupt pin we can use It to wake Arduino.
When you are in Sleep mode the e32 put on the buffer the data recived and go immediately LOW, when data is ready return HIGHT, LOW It’s perfect to wake the microcontroller.
Arduino wake up
As the e32 device Arduino have some sleep type, but for this test we are going to use power-down mode.
Library PowerDown
To manage power saving and sleep of Arduino device exist a beautiful library called LowPower.
You can download It directly here or you can go to the Git repository.
You must download the library and put It on Arduino library folder
How to put in sleep Arduino
The command to put on power down the microcontroller is quite simple
// Enter power down state with ADC and BOD module disabled.
// Wake up when wake up pin is low.
LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF);
But we must specify that the device must wake when AUX pin go LOW
// Allow wake up pin to trigger interrupt on low.
attachInterrupt(1, AUX_PIN, LOW);
// Enter power down state with ADC and BOD module disabled.
// Wake up when wake up pin is low.
LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF);
// Disable external pin interrupt on wake up pin.
detachInterrupt(1);
So the code to receive transmission become so:
/*
* LoRa E32-TTL-100
* Receive fixed transmission message on channel.
* https://mischianti.org/lora-e32-device-for-arduino-esp32-or-esp8266-wor-wake-on-radio-the-microcontroller-also-and-new-arduino-shield-part-6/
*
* E32-TTL-100----- Arduino UNO or esp8266
* M0 ----- 3.3v (To config) GND (To send) 7 (To dinamically manage)
* M1 ----- 3.3v (To config) GND (To send) 6 (To dinamically manage)
* TX ----- RX PIN 3 (PullUP)
* RX ----- TX PIN 4 (PullUP & Voltage divider)
* AUX ----- PIN 2 (PullUP)
* VCC ----- 3.3v/5v
* GND ----- GND
*
*/
#include "Arduino.h"
#include "LowPower.h"
#include "LoRa_E32.h"
// ---------- Arduino pins --------------
//LoRa_E32 e32ttl(4, 5, 3, 7, 6);
LoRa_E32 e32ttl(4, 5, 3); // Config without connect M0 M1
// Use pin 2 as wake up pin
const int wakeUpPin = 3;
//#include <SoftwareSerial.h>
//SoftwareSerial mySerial(4, 5); // Arduino RX <-- e32 TX, Arduino TX --> e32 RX
//LoRa_E32 e32ttl(&mySerial, 3, 7, 6);
// -------------------------------------
void printParameters(struct Configuration configuration);
void printModuleInformation(struct ModuleInformation moduleInformation);
void wakeUp()
{
Serial.println("WAKE!");
}
//The setup function is called once at startup of the sketch
void setup()
{
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB
}
delay(100);
e32ttl.begin();
// e32ttl.resetModule();
// After set configuration comment set M0 and M1 to low
// and reboot if you directly set HIGH M0 and M1 to program
// ResponseStructContainer c;
// c = e32ttl.getConfiguration();
// Configuration configuration = *(Configuration*) c.data;
// configuration.ADDL = 3;
// configuration.ADDH = 0;
// configuration.CHAN = 0x04;
// configuration.OPTION.fixedTransmission = FT_FIXED_TRANSMISSION;
// configuration.OPTION.wirelessWakeupTime = WAKE_UP_250;
//
// configuration.OPTION.fec = FEC_1_ON;
// configuration.OPTION.ioDriveMode = IO_D_MODE_PUSH_PULLS_PULL_UPS;
// configuration.OPTION.transmissionPower = POWER_20;
//
// configuration.SPED.airDataRate = AIR_DATA_RATE_010_24;
// configuration.SPED.uartBaudRate = UART_BPS_9600;
// configuration.SPED.uartParity = MODE_00_8N1;
//
// e32ttl.setConfiguration(configuration, WRITE_CFG_PWR_DWN_SAVE);
// printParameters(configuration);
// ---------------------------
Serial.println();
Serial.println("Start listening!");
e32ttl.setMode(MODE_2_POWER_SAVING);
// Allow wake up pin to trigger interrupt on low.
attachInterrupt(1, wakeUp, LOW);
// Enter power down state with ADC and BOD module disabled.
// Wake up when wake up pin is low.
LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF);
// Disable external pin interrupt on wake up pin.
detachInterrupt(1);
Serial.println("OK listening!");
}
// The loop function is called in an endless loop
void loop()
{
if (e32ttl.available() > 1){
ResponseContainer rs = e32ttl.receiveMessage();
// First of all get the data
String message = rs.data;
Serial.print("Received --> ");
Serial.print(rs.status.getResponseDescription());
Serial.print(" - ");
Serial.println(message);
}
delay(125);
}
void printParameters(struct Configuration configuration) {
Serial.println("----------------------------------------");
Serial.print(F("HEAD : ")); Serial.print(configuration.HEAD, BIN);Serial.print(" ");Serial.print(configuration.HEAD, DEC);Serial.print(" ");Serial.println(configuration.HEAD, HEX);
Serial.println(F(" "));
Serial.print(F("AddH : ")); Serial.println(configuration.ADDH, DEC);
Serial.print(F("AddL : ")); Serial.println(configuration.ADDL, DEC);
Serial.print(F("Chan : ")); Serial.print(configuration.CHAN, DEC); Serial.print(" -> "); Serial.println(configuration.getChannelDescription());
Serial.println(F(" "));
Serial.print(F("SpeedParityBit : ")); Serial.print(configuration.SPED.uartParity, BIN);Serial.print(" -> "); Serial.println(configuration.SPED.getUARTParityDescription());
Serial.print(F("SpeedUARTDatte : ")); Serial.print(configuration.SPED.uartBaudRate, BIN);Serial.print(" -> "); Serial.println(configuration.SPED.getUARTBaudRate());
Serial.print(F("SpeedAirDataRate : ")); Serial.print(configuration.SPED.airDataRate, BIN);Serial.print(" -> "); Serial.println(configuration.SPED.getAirDataRate());
Serial.print(F("OptionTrans : ")); Serial.print(configuration.OPTION.fixedTransmission, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getFixedTransmissionDescription());
Serial.print(F("OptionPullup : ")); Serial.print(configuration.OPTION.ioDriveMode, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getIODroveModeDescription());
Serial.print(F("OptionWakeup : ")); Serial.print(configuration.OPTION.wirelessWakeupTime, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getWirelessWakeUPTimeDescription());
Serial.print(F("OptionFEC : ")); Serial.print(configuration.OPTION.fec, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getFECDescription());
Serial.print(F("OptionPower : ")); Serial.print(configuration.OPTION.transmissionPower, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getTransmissionPowerDescription());
Serial.println("----------------------------------------");
}
void printModuleInformation(struct ModuleInformation moduleInformation) {
Serial.println("----------------------------------------");
Serial.print(F("HEAD BIN: ")); Serial.print(moduleInformation.HEAD, BIN);Serial.print(" ");Serial.print(moduleInformation.HEAD, DEC);Serial.print(" ");Serial.println(moduleInformation.HEAD, HEX);
Serial.print(F("Freq.: ")); Serial.println(moduleInformation.frequency, HEX);
Serial.print(F("Version : ")); Serial.println(moduleInformation.version, HEX);
Serial.print(F("Features : ")); Serial.println(moduleInformation.features, HEX);
Serial.println("----------------------------------------");
}
The result is that the Serial stop on line 91, when we receive the message the e32 wake itself and put AUX LOW, so Arduino wake with interrupt on AUX pin.
Here the sending sketch:
/*
* LoRa E32-TTL-100
* Send fixed broadcast transmission message to a specified channel.
* https://mischianti.org/lora-e32-device-for-arduino-esp32-or-esp8266-wor-wake-on-radio-the-microcontroller-also-and-new-arduino-shield-part-6/
*
*/
#include "Arduino.h"
#include "LoRa_E32.h"
// ---------- esp8266 pins --------------
LoRa_E32 e32ttl(D2, D3, D5, D7, D6); //, D5); //, D7, D6); // Config without connect AUX and M0 M1
// -------------------------------------
void printParameters(struct Configuration configuration);
void printModuleInformation(struct ModuleInformation moduleInformation);
//The setup function is called once at startup of the sketch
void setup()
{
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB
}
delay(100);
while (!e32ttl.begin()) {
delay(2000); // wait for serial port to connect. Needed for native USB
}
e32ttl.setMode(MODE_1_WAKE_UP);
// e32ttl.resetModule();
// After set configuration comment set M0 and M1 to low
// and reboot if you directly set HIGH M0 and M1 to program
ResponseStructContainer c;
c = e32ttl.getConfiguration();
Configuration configuration = *(Configuration*) c.data;
printParameters(configuration);
// configuration.SPED.uartBaudRate = UART_BPS_9600;
// configuration.SPED.airDataRate = AIR_DATA_RATE_010_24;
configuration.ADDL = 0x01;
configuration.ADDH = 0x00;
configuration.CHAN = 0x04;
configuration.OPTION.fixedTransmission = FT_FIXED_TRANSMISSION;
configuration.OPTION.wirelessWakeupTime = WAKE_UP_750;
configuration.OPTION.fec = FEC_1_ON;
configuration.OPTION.ioDriveMode = IO_D_MODE_PUSH_PULLS_PULL_UPS;
configuration.OPTION.transmissionPower = POWER_20;
configuration.SPED.airDataRate = AIR_DATA_RATE_010_24;
configuration.SPED.uartBaudRate = UART_BPS_9600;
configuration.SPED.uartParity = MODE_00_8N1;
e32ttl.setConfiguration(configuration, WRITE_CFG_PWR_DWN_SAVE);
printParameters(configuration);
// ---------------------------
}
int i = 0;
// The loop function is called in an endless loop
void loop()
{
i++;
String mess = "Message to 00 03 04 deviceMessage to ";
String compMEss = mess+i;
Serial.print(compMEss);
Serial.print(" - ");
ResponseStatus rs = e32ttl.sendFixedMessage(0, 3, 0x04, compMEss);
Serial.println(rs.getResponseDescription());
delay(8000);
}
void printParameters(struct Configuration configuration) {
Serial.println("----------------------------------------");
Serial.print(F("HEAD : ")); Serial.print(configuration.HEAD, BIN);Serial.print(" ");Serial.print(configuration.HEAD, DEC);Serial.print(" ");Serial.println(configuration.HEAD, HEX);
Serial.println(F(" "));
Serial.print(F("AddH : ")); Serial.println(configuration.ADDH, DEC);
Serial.print(F("AddL : ")); Serial.println(configuration.ADDL, DEC);
Serial.print(F("Chan : ")); Serial.print(configuration.CHAN, DEC); Serial.print(" -> "); Serial.println(configuration.getChannelDescription());
Serial.println(F(" "));
Serial.print(F("SpeedParityBit : ")); Serial.print(configuration.SPED.uartParity, BIN);Serial.print(" -> "); Serial.println(configuration.SPED.getUARTParityDescription());
Serial.print(F("SpeedUARTDatte : ")); Serial.print(configuration.SPED.uartBaudRate, BIN);Serial.print(" -> "); Serial.println(configuration.SPED.getUARTBaudRate());
Serial.print(F("SpeedAirDataRate : ")); Serial.print(configuration.SPED.airDataRate, BIN);Serial.print(" -> "); Serial.println(configuration.SPED.getAirDataRate());
Serial.print(F("OptionTrans : ")); Serial.print(configuration.OPTION.fixedTransmission, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getFixedTransmissionDescription());
Serial.print(F("OptionPullup : ")); Serial.print(configuration.OPTION.ioDriveMode, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getIODroveModeDescription());
Serial.print(F("OptionWakeup : ")); Serial.print(configuration.OPTION.wirelessWakeupTime, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getWirelessWakeUPTimeDescription());
Serial.print(F("OptionFEC : ")); Serial.print(configuration.OPTION.fec, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getFECDescription());
Serial.print(F("OptionPower : ")); Serial.print(configuration.OPTION.transmissionPower, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getTransmissionPowerDescription());
Serial.println("----------------------------------------");
}
void printModuleInformation(struct ModuleInformation moduleInformation) {
Serial.println("----------------------------------------");
Serial.print(F("HEAD BIN: ")); Serial.print(moduleInformation.HEAD, BIN);Serial.print(" ");Serial.print(moduleInformation.HEAD, DEC);Serial.print(" ");Serial.println(moduleInformation.HEAD, HEX);
Serial.print(F("Freq.: ")); Serial.println(moduleInformation.frequency, HEX);
Serial.print(F("Version : ")); Serial.println(moduleInformation.version, HEX);
Serial.print(F("Features : ")); Serial.println(moduleInformation.features, HEX);
Serial.println("----------------------------------------");
}
Arduino UNO shield
I create also an Arduino shield very usefully to use.
With this board you can use this device directly without problem or voltage divider.
The configuration is this:
LoRa_E32 e32ttl(4, 5, 3, 7, 6);
Than you can use all examples inside the library, you can use pin 6 and 7 to do a full connection or disable they and put M0 and M1 as you want with dipswitch.
Here the first test, seems all ok.
Now we are going to do a massive production.
Ready to go
The shield have some jumper and dip switch to configure M0 and M1.
If you want set M0 and M1 to a fixed value you must put jumper to F, if you want control via pin to P.
If you set to F you must put dip switch on property value Low or High.
Shopping List
You can find here AliExpress (433MHz 5Km) - AliExpress (433MHz 8Km) - AliExpress (433MHz 16Km) - AliExpress (868MHz 915MHz 5.5Km) - AliExpress (868MHz 915MHz 8Km)
Amount Part Type Properties 1 Lora E32-TTL-100 variant 1; voltage 3-5V; type Basic 1 DIP SWITCH channels 1; package dipswitch-02 2 Generic male header – 3 pins pins 3; pin spacing 0.1in (2.54mm); hole size 1.0mm,0.508mm; form ♂ (male); package THT; row single 1 Arduino Uno (Rev3) type Arduino UNO (Rev3) 3 4.7kΩ Resistor bands 4; tolerance ±5%; pin spacing 400 mil; package THT; resistance 4.7kΩ 3 1kΩ Resistor bands 4; tolerance ±5%; pin spacing 400 mil; package THT; resistance 1kΩ 3 2kΩ Resistor bands 4; tolerance ±5%; pin spacing 400 mil; package THT; resistance 2kΩ 3 10kΩ Resistor bands 4; tolerance ±5%; pin spacing 400 mil; package THT; resistance 10kΩ 1 Momentary Tactile Push Button package [THT] 1 Generic female header – 7 pins Pin spacing 0.1in (2.54mm); 2 Generic male/female header – 8 pins Pin spacing 0.1in (2.54mm); 1 Generic male/female header – 6 pins Pin spacing 0.1in (2.54mm); 1 Generic male/female header – 10 pins Pin spacing 0.1in (2.54mm);
You can get the PCB from PCBWay 10 at 5$ PCBWay
Here my Crtistmas present
I chose this manufacturer because at the same cost it offers excellent quality, in the first screen it is possible to make countless options suitable for every need.
The board as you can see on various photo is very beautiful and simply to solder.
Assembly video
Here the soldering video.
Here the result
Thanks
- LoRa E32 device for Arduino, esp32 or esp8266: settings and basic usage
- LoRa E32 device for Arduino, esp32 or esp8266: library
- LoRa E32 device for Arduino, esp32 or esp8266: configuration
- LoRa E32 device for Arduino, esp32 or esp8266: fixed transmission
- LoRa E32 device for Arduino, esp32 or esp8266: power saving and sending structured data
- LoRa E32 device for Arduino, esp32 or esp8266: WOR (wake on radio) microcontroller and Arduino shield
- LoRa E32 device for Arduino, esp32 or esp8266: WOR (wake on radio) microcontroller and WeMos D1 shield
- EByte LoRa E32 device for Arduino, esp32 or esp8266: WOR (wake on radio) and new ESP32 shield
- Ebyte LoRa E32 with STM32: WOR (wake on radio) and new STM32 shield
- Mischianti Arduino LoRa shield (Open source)
- Mischianti WeMos LoRa shield (Open source)
- Mischianti ESP32 DOIT DEV KIT v1 shield (Open source)
- STM32F1 Blue-Pill EByte LoRa E32, E22, and E220 Shield
- STM32F4 Black-Pill EByte LoRa E32, E22, and E220 Shield