Abhinav KrishnaAmritha M
Published © MIT

EleTect: Mitigating Human-Elephant conflict with AI

EleTect seeks to safeguard lives, promote harmony, and aid in the preservation of animals by utilizing technology and ecological knowledge.

IntermediateWork in progressOver 2 days348
EleTect: Mitigating Human-Elephant conflict with AI

Things used in this project

Hardware components

Grove Vision AI Module V2
Seeed Studio Grove Vision AI Module V2
×2
Camera Module
Raspberry Pi Camera Module
×2
Seeed Studio XIAO ESP32S3 Sense
Seeed Studio XIAO ESP32S3 Sense
×2
Seeed Studio XIAO ESP32C3
×2
Grove - LoRa Radio 868MHz
Seeed Studio Grove - LoRa Radio 868MHz
×3
Seeed Studio LoRa Antenna
×1
DFRobot DFMini
×2
Speaker: 3W, 4 ohms
Speaker: 3W, 4 ohms
×2
Arduino Mega 2560
Arduino Mega 2560
×1
SIM800L GSM Module
×1
TP 4056 Battery Charger module
×3
Solar Panel, 2.5 W
Solar Panel, 2.5 W
×3
Solar Power Manager 5V
DFRobot Solar Power Manager 5V
×3

Software apps and online services

Seeed Studio SenseCraft AI
Edge Impulse Studio
Edge Impulse Studio
Roboflow
Google collab
Arduino IDE
Arduino IDE
Node-RED
Node-RED
Solidworks

Hand tools and fabrication machines

3D Printer (generic)
3D Printer (generic)
Solder Wire, Lead Free
Solder Wire, Lead Free
Soldering iron (generic)
Soldering iron (generic)
Premium Female/Male Extension Jumper Wires, 40 x 6" (150mm)
Premium Female/Male Extension Jumper Wires, 40 x 6" (150mm)

Story

Read more

Custom parts and enclosures

Node-box

Node-Back cover

Master-Top cover

Casing

Master-box

Schematics

Block diagram

Data Acquisition

Code

SIM800L Test code

C/C++
#include <SoftwareSerial.h>
#include "Adafruit_FONA.h"
#define FONA_RX 2
#define FONA_TX 3
#define FONA_RST 4
char replybuffer[255];
SoftwareSerial sim800l = SoftwareSerial(FONA_TX, FONA_RX);
Adafruit_FONA gsm = Adafruit_FONA(FONA_RST);
//uint8_t readline(char *buff, uint8_t maxbuff, uint16_t timeout = 0);
void setup() {
Serial.begin(9600);
sim800l.begin(9600);
if (! gsm.begin(sim800l)) {
Serial.println(F("Couldn't find SIM800L!"));
while (1);
}
char sendto[21] = "*********"; //give the phone number
char message[141] = "Alert!!!
                    Elephant spotted at Node x
                    Place"; // replace the x and place with node number and installed place
gsm.sendSMS(sendto, message);
delay(1000);
}
void loop() {}

Audio TinyMl model

C/C++
/* Edge Impulse Arduino examples
* Copyright (c) 2022 EdgeImpulse Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
// These sketches are tested with 2.0.4 ESP32 Arduino Core
// https://github.com/espressif/arduino-esp32/releases/tag/2.0.4
// If your target is limited in memory remove this macro to save 10K RAM
#define EIDSP_QUANTIZE_FILTERBANK 0
/*
** NOTE: If you run into TFLite arena allocation issue.
**
** This may be due to may dynamic memory fragmentation.
** Try defining "-DEI_CLASSIFIER_ALLOCATION_STATIC" in boards.local.txt (create
** if it doesn't exist) and copy this file to
** `<ARDUINO_CORE_INSTALL_PATH>/arduino/hardware/<mbed_core>/<core_version>/`.
**
** See
** (https://support.arduino.cc/hc/en-us/articles/360012076960-Where-are-the-installed-cores-located-)
** to find where Arduino installs cores on your machine.
**
** If the problem persists then there's not enough memory for this model and application.
*/
/* Includes ---------------------------------------------------------------- */
#include <EleTect_inferencing.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/i2s.h"
/** Audio buffers, pointers and selectors */
typedef struct {
int16_t *buffer;
uint8_t buf_ready;
uint32_t buf_count;
uint32_t n_samples;
} inference_t;
static inference_t inference;
static const uint32_t sample_buffer_size = 2048;
static signed short sampleBuffer[sample_buffer_size];
static bool debug_nn = false; // Set this to true to see e.g. features generated from the raw signal
static bool record_status = true;
/**
* @brief      Arduino setup function
*/
void setup()
{
// put your setup code here, to run once:
Serial.begin(115200);
// comment out the below line to cancel the wait for USB connection (needed for native USB)
while (!Serial);
Serial.println("Edge Impulse Inferencing Demo");
// summary of inferencing settings (from model_metadata.h)
ei_printf("Inferencing settings:\n");
ei_printf("\tInterval: ");
ei_printf_float((float)EI_CLASSIFIER_INTERVAL_MS);
ei_printf(" ms.\n");
ei_printf("\tFrame size: %d\n", EI_CLASSIFIER_DSP_INPUT_FRAME_SIZE);
ei_printf("\tSample length: %d ms.\n", EI_CLASSIFIER_RAW_SAMPLE_COUNT / 16);
ei_printf("\tNo. of classes: %d\n", sizeof(ei_classifier_inferencing_categories) / sizeof(ei_classifier_inferencing_categories[0]));
ei_printf("\nStarting continious inference in 2 seconds...\n");
ei_sleep(2000);
if (microphone_inference_start(EI_CLASSIFIER_RAW_SAMPLE_COUNT) == false) {
ei_printf("ERR: Could not allocate audio buffer (size %d), this could be due to the window length of your model\r\n", EI_CLASSIFIER_RAW_SAMPLE_COUNT);
return;
}
ei_printf("Recording...\n");
}
/**
* @brief      Arduino main function. Runs the inferencing loop.
*/
void loop()
{
bool m = microphone_inference_record();
if (!m) {
ei_printf("ERR: Failed to record audio...\n");
return;
}
signal_t signal;
signal.total_length = EI_CLASSIFIER_RAW_SAMPLE_COUNT;
signal.get_data = &microphone_audio_signal_get_data;
ei_impulse_result_t result = { 0 };
EI_IMPULSE_ERROR r = run_classifier(&signal, &result, debug_nn);
if (r != EI_IMPULSE_OK) {
ei_printf("ERR: Failed to run classifier (%d)\n", r);
return;
}
// print the predictions
ei_printf("Predictions ");
ei_printf("(DSP: %d ms., Classification: %d ms., Anomaly: %d ms.)",
result.timing.dsp, result.timing.classification, result.timing.anomaly);
ei_printf(": \n");
for (size_t ix = 0; ix < EI_CLASSIFIER_LABEL_COUNT; ix++) {
ei_printf("    %s: ", result.classification[ix].label);
ei_printf_float(result.classification[ix].value);
ei_printf("\n");
}
#if EI_CLASSIFIER_HAS_ANOMALY == 1
ei_printf("    anomaly score: ");
ei_printf_float(result.anomaly);
ei_printf("\n");
#endif
}
static void audio_inference_callback(uint32_t n_bytes)
{
for(int i = 0; i < n_bytes>>1; i++) {
inference.buffer[inference.buf_count++] = sampleBuffer[i];
if(inference.buf_count >= inference.n_samples) {
inference.buf_count = 0;
inference.buf_ready = 1;
}
}
}
static void capture_samples(void* arg) {
const int32_t i2s_bytes_to_read = (uint32_t)arg;
size_t bytes_read = i2s_bytes_to_read;
while (record_status) {
/* read data at once from i2s */
i2s_read((i2s_port_t)1, (void*)sampleBuffer, i2s_bytes_to_read, &bytes_read, 100);
if (bytes_read <= 0) {
ei_printf("Error in I2S read : %d", bytes_read);
}
else {
if (bytes_read < i2s_bytes_to_read) {
ei_printf("Partial I2S read");
}
// scale the data (otherwise the sound is too quiet)
for (int x = 0; x < i2s_bytes_to_read/2; x++) {
sampleBuffer[x] = (int16_t)(sampleBuffer[x]) * 8;
}
if (record_status) {
audio_inference_callback(i2s_bytes_to_read);
}
else {
break;
}
}
}
vTaskDelete(NULL);
}
/**
* @brief      Init inferencing struct and setup/start PDM
*
* @param[in]  n_samples  The n samples
*
* @return     { description_of_the_return_value }
*/
static bool microphone_inference_start(uint32_t n_samples)
{
inference.buffer = (int16_t *)malloc(n_samples * sizeof(int16_t));
if(inference.buffer == NULL) {
return false;
}
inference.buf_count  = 0;
inference.n_samples  = n_samples;
inference.buf_ready  = 0;
if (i2s_init(EI_CLASSIFIER_FREQUENCY)) {
ei_printf("Failed to start I2S!");
}
ei_sleep(100);
record_status = true;
xTaskCreate(capture_samples, "CaptureSamples", 1024 * 32, (void*)sample_buffer_size, 10, NULL);
return true;
}
/**
* @brief      Wait on new data
*
* @return     True when finished
*/
static bool microphone_inference_record(void)
{
bool ret = true;
while (inference.buf_ready == 0) {
delay(10);
}
inference.buf_ready = 0;
return ret;
}
/**
* Get raw audio signal data
*/
static int microphone_audio_signal_get_data(size_t offset, size_t length, float *out_ptr)
{
numpy::int16_to_float(&inference.buffer[offset], out_ptr, length);
return 0;
}
/**
* @brief      Stop PDM and release buffers
*/
static void microphone_inference_end(void)
{
i2s_deinit();
ei_free(inference.buffer);
}
static int i2s_init(uint32_t sampling_rate) {
// Start listening for audio: MONO @ 8/16KHz
i2s_config_t i2s_config = {
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_TX),
.sample_rate = sampling_rate,
.bits_per_sample = (i2s_bits_per_sample_t)16,
.channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT,
.communication_format = I2S_COMM_FORMAT_I2S,
.intr_alloc_flags = 0,
.dma_buf_count = 8,
.dma_buf_len = 512,
.use_apll = false,
.tx_desc_auto_clear = false,
.fixed_mclk = -1,
};
i2s_pin_config_t pin_config = {
.bck_io_num = 26,    // IIS_SCLK
.ws_io_num = 32,     // IIS_LCLK
.data_out_num = -1,  // IIS_DSIN
.data_in_num = 33,   // IIS_DOUT
};
esp_err_t ret = 0;
ret = i2s_driver_install((i2s_port_t)1, &i2s_config, 0, NULL);
if (ret != ESP_OK) {
ei_printf("Error in i2s_driver_install");
}
ret = i2s_set_pin((i2s_port_t)1, &pin_config);
if (ret != ESP_OK) {
ei_printf("Error in i2s_set_pin");
}
ret = i2s_zero_dma_buffer((i2s_port_t)1);
if (ret != ESP_OK) {
ei_printf("Error in initializing dma buffer with 0");
}
return int(ret);
}
static int i2s_deinit(void) {
i2s_driver_uninstall((i2s_port_t)1); //stop & destroy i2s driver
return 0;
}
#if !defined(EI_CLASSIFIER_SENSOR) || EI_CLASSIFIER_SENSOR != EI_CLASSIFIER_SENSOR_MICROPHONE
#error "Invalid model for current sensor."
#endif

Record Audio with XIAO ESP32S3 Sense

C/C++
/*
* WAV Recorder for Seeed XIAO ESP32S3 Sense
*
* NOTE: To execute this code, we will need to use the PSRAM
* function of the ESP-32 chip, so please turn it on before uploading.
* Tools>PSRAM: "OPI PSRAM"
*
* Adapted by M.Rovai @May23 from original Seeed code
*/
#include <I2S.h>
#include "FS.h"
#include "SD.h"
#include "SPI.h"
// make changes as needed
#define RECORD_TIME   10  // seconds, The maximum value is 240
#define WAV_FILE_NAME "data"
// do not change for best
#define SAMPLE_RATE 16000U
#define SAMPLE_BITS 16
#define WAV_HEADER_SIZE 44
#define VOLUME_GAIN 2
int fileNumber = 1;
String baseFileName;
bool isRecording = false;
void setup() {
Serial.begin(115200);
while (!Serial) ;
I2S.setAllPins(-1, 42, 41, -1, -1);
if (!I2S.begin(PDM_MONO_MODE, SAMPLE_RATE, SAMPLE_BITS)) {
Serial.println("Failed to initialize I2S!");
while (1) ;
}
if(!SD.begin(21)){
Serial.println("Failed to mount SD Card!");
while (1) ;
}
Serial.printf("Enter with the label name\n");
//record_wav();
}
void loop() {
if (Serial.available() > 0) {
String command = Serial.readStringUntil('\n');
command.trim();
if (command == "rec") {
isRecording = true;
} else {
baseFileName = command;
fileNumber = 1; // reset file number each time a new base file name is set
Serial.printf("Send rec for starting recording label \n");
}
}
if (isRecording && baseFileName != "") {
String fileName = "/" + baseFileName + "." + String(fileNumber) + ".wav";
fileNumber++;
record_wav(fileName);
delay(1000); // delay to avoid recording multiple files at once
isRecording = false;
}
}
void record_wav(String fileName)
{
uint32_t sample_size = 0;
uint32_t record_size = (SAMPLE_RATE * SAMPLE_BITS / 8) * RECORD_TIME;
uint8_t *rec_buffer = NULL;
Serial.printf("Start recording ...\n");
File file = SD.open(fileName.c_str(), FILE_WRITE);
// Write the header to the WAV file
uint8_t wav_header[WAV_HEADER_SIZE];
generate_wav_header(wav_header, record_size, SAMPLE_RATE);
file.write(wav_header, WAV_HEADER_SIZE);
// PSRAM malloc for recording
rec_buffer = (uint8_t *)ps_malloc(record_size);
if (rec_buffer == NULL) {
Serial.printf("malloc failed!\n");
while(1) ;
}
Serial.printf("Buffer: %d bytes\n", ESP.getPsramSize() - ESP.getFreePsram());
// Start recording
esp_i2s::i2s_read(esp_i2s::I2S_NUM_0, rec_buffer, record_size, &sample_size, portMAX_DELAY);
if (sample_size == 0) {
Serial.printf("Record Failed!\n");
} else {
Serial.printf("Record %d bytes\n", sample_size);
}
// Increase volume
for (uint32_t i = 0; i < sample_size; i += SAMPLE_BITS/8) {
(*(uint16_t *)(rec_buffer+i)) <<= VOLUME_GAIN;
}
// Write data to the WAV file
Serial.printf("Writing to the file ...\n");
if (file.write(rec_buffer, record_size) != record_size)
Serial.printf("Write file Failed!\n");
free(rec_buffer);
file.close();
Serial.printf("Recording complete: \n");
Serial.printf("Send rec for a new sample or enter a new label\n\n");
}
void generate_wav_header(uint8_t *wav_header, uint32_t wav_size, uint32_t sample_rate)
{
// See this for reference: http://soundfile.sapp.org/doc/WaveFormat/
uint32_t file_size = wav_size + WAV_HEADER_SIZE - 8;
uint32_t byte_rate = SAMPLE_RATE * SAMPLE_BITS / 8;
const uint8_t set_wav_header[] = {
'R', 'I', 'F', 'F', // ChunkID
file_size, file_size >> 8, file_size >> 16, file_size >> 24, // ChunkSize
'W', 'A', 'V', 'E', // Format
'f', 'm', 't', ' ', // Subchunk1ID
0x10, 0x00, 0x00, 0x00, // Subchunk1Size (16 for PCM)
0x01, 0x00, // AudioFormat (1 for PCM)
0x01, 0x00, // NumChannels (1 channel)
sample_rate, sample_rate >> 8, sample_rate >> 16, sample_rate >> 24, // SampleRate
byte_rate, byte_rate >> 8, byte_rate >> 16, byte_rate >> 24, // ByteRate
0x02, 0x00, // BlockAlign
0x10, 0x00, // BitsPerSample (16 bits)
'd', 'a', 't', 'a', // Subchunk2ID
wav_size, wav_size >> 8, wav_size >> 16, wav_size >> 24, // Subchunk2Size
};
memcpy(wav_header, set_wav_header, sizeof(set_wav_header));
}

DFMini Test code

C/C++
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"
//Inicia a serial por software nos pinos 10 e 11
SoftwareSerial mySoftwareSerial(10, 11); // RX, TX
DFRobotDFPlayerMini myDFPlayer;
char command;
int pausa = 0;
void setup()
{
//Comunicacao serial com o modulo
mySoftwareSerial.begin(9600);
//Inicializa a serial do Arduino
Serial.begin(115200);
//Verifica se o modulo esta respondendo e se o
//cartao SD foi encontrado
Serial.println();
Serial.println(F("DFRobot DFPlayer Mini"));
Serial.println(F("Initializing DFPlayer module ... Wait!"));
if (!myDFPlayer.begin(mySoftwareSerial))
{
Serial.println(F("Not initialized:"));
Serial.println(F("1. Check the DFPlayer Mini connections"));
Serial.println(F("2. Insert an SD card"));
while (true);
}
Serial.println();
Serial.println(F("DFPlayer Mini module initialized!"));
//Definicoes iniciais
myDFPlayer.setTimeOut(500); //Timeout serial 500ms
myDFPlayer.volume(5); //Volume 5
myDFPlayer.EQ(0); //Equalizacao normal
menu_opcoes();
}
void loop()
{
//Waits for data entry via serial
while (Serial.available() > 0)
{
command = Serial.read();
if ((command >= '1') && (command <= '9'))
{
Serial.print("Music reproduction");
Serial.println(command);
command = command - 48;
myDFPlayer.play(command);
menu_opcoes();
}
//Reproduction
//Stop
if (command == 's')
{
myDFPlayer.stop();
Serial.println("Music Stopped!");
menu_opcoes();
}
//Pausa/Continua a musica
if (command == 'p')
{
pausa = !pausa;
if (pausa == 0)
{
Serial.println("Continue...");
myDFPlayer.start();
}
if (pausa == 1)
{
Serial.println("Music Paused!");
myDFPlayer.pause();
}
menu_opcoes();
}
//Increases volume
if (command == '+')
{
myDFPlayer.volumeUp();
Serial.print("Current volume:");
Serial.println(myDFPlayer.readVolume());
menu_opcoes();
}
if (command == '<')
{
myDFPlayer.previous();
Serial.println("Previous:");
Serial.print("Current track:");
Serial.println(myDFPlayer.readCurrentFileNumber()-1);
menu_opcoes();
}
if (command == '>')
{
myDFPlayer.next();
Serial.println("next:");
Serial.print("Current track:");
Serial.println(myDFPlayer.readCurrentFileNumber()+1);
menu_opcoes();
}
//Decreases volume
if (command == '-')
{
myDFPlayer.volumeDown();
Serial.print("Current Volume:");
Serial.println(myDFPlayer.readVolume());
menu_opcoes();
}
}
}
void menu_opcoes()
{
Serial.println();
Serial.println(F("=================================================================================================================================="));
Serial.println(F("Commands:"));
Serial.println(F(" [1-3] To select the MP3 file"));
Serial.println(F(" [s] stopping reproduction"));
Serial.println(F(" [p] pause/continue music"));
Serial.println(F(" [+ or -] increases or decreases the volume"));
Serial.println(F(" [< or >] forwards or backwards the track"));
Serial.println();
Serial.println(F("================================================================================================================================="));
}

LoRa P2P

C/C++
# include <Arduino.h>
# include <U8x8lib.h>
// #define NODE_SLAVE
U8X8_SSD1306_128X64_NONAME_HW_I2C u8x8(/*reset=*/U8X8_PIN_NONE);
// U8X8_SSD1306_128X64_NONAME_SW_I2C u8x8(/*clock=*/ SCL, /*data=*/ SDA, /*reset=*/ U8X8_PIN_NONE);   // OLEDs without Reset of the Display
static char recv_buf[512];
static bool is_exist = false;
static int at_send_check_response(char *p_ack, int timeout_ms, char*p_cmd, ...)
{
int ch = 0;
int index = 0;
int startMillis = 0;
va_list args;
memset(recv_buf, 0, sizeof(recv_buf));
va_start(args, p_cmd);
Serial1.printf(p_cmd, args);
Serial.printf(p_cmd, args);
va_end(args);
delay(200);
startMillis = millis();
if (p_ack == NULL)
{
return 0;
}
do
{
while (Serial1.available() > 0)
{
ch = Serial1.read();
recv_buf[index++] = ch;
Serial.print((char)ch);
delay(2);
}
if (strstr(recv_buf, p_ack) != NULL)
{
return 1;
}
} while (millis() - startMillis < timeout_ms);
return 0;
}
static int recv_prase(void)
{
char ch;
int index = 0;
memset(recv_buf, 0, sizeof(recv_buf));
while (Serial1.available() > 0)
{
ch = Serial1.read();
recv_buf[index++] = ch;
Serial.print((char)ch);
delay(2);
}
if (index)
{
char *p_start = NULL;
char data[32] = {
0,
};
int rssi = 0;
int snr = 0;
p_start = strstr(recv_buf, "+TEST: RX \"5345454544");
if (p_start)
{
p_start = strstr(recv_buf, "5345454544");
if (p_start && (1 == sscanf(p_start, "5345454544%s", data)))
{
data[4] = 0;
u8x8.setCursor(0, 4);
u8x8.print("               ");
u8x8.setCursor(2, 4);
u8x8.print("RX: 0x");
u8x8.print(data);
Serial.print(data);
Serial.print("\r\n");
}
p_start = strstr(recv_buf, "RSSI:");
if (p_start && (1 == sscanf(p_start, "RSSI:%d,", &rssi)))
{
u8x8.setCursor(0, 6);
u8x8.print("                ");
u8x8.setCursor(2, 6);
u8x8.print("rssi:");
u8x8.print(rssi);
}
p_start = strstr(recv_buf, "SNR:");
if (p_start && (1 == sscanf(p_start, "SNR:%d", &snr)))
{
u8x8.setCursor(0, 7);
u8x8.print("                ");
u8x8.setCursor(2, 7);
u8x8.print("snr :");
u8x8.print(snr);
}
return 1;
}
}
return 0;
}
static int node_recv(uint32_t timeout_ms)
{
at_send_check_response("+TEST: RXLRPKT", 1000, "AT+TEST=RXLRPKT\r\n");
int startMillis = millis();
do
{
if (recv_prase())
{
return 1;
}
} while (millis() - startMillis < timeout_ms);
return 0;
}
static int node_send(void)
{
static uint16_t count = 0;
int ret = 0;
char data[32];
char cmd[128];
memset(data, 0, sizeof(data));
sprintf(data, "%04X", count);
sprintf(cmd, "AT+TEST=TXLRPKT,\"5345454544%s\"\r\n", data);
u8x8.setCursor(0, 3);
u8x8.print("                ");
u8x8.setCursor(2, 3);
u8x8.print("TX: 0x");
u8x8.print(data);
ret = at_send_check_response("TX DONE", 2000, cmd);
if (ret == 1)
{
count++;
Serial.print("Sent successfully!\r\n");
}
else
{
Serial.print("Send failed!\r\n");
}
return ret;
}
static void node_recv_then_send(uint32_t timeout)
{
int ret = 0;
ret = node_recv(timeout);
delay(100);
if (!ret)
{
Serial.print("\r\n");
return;
}
node_send();
Serial.print("\r\n");
}
static void node_send_then_recv(uint32_t timeout)
{
int ret = 0;
ret = node_send();
if (!ret)
{
Serial.print("\r\n");
return;
}
if (!node_recv(timeout))
{
Serial.print("recv timeout!\r\n");
}
Serial.print("\r\n");
}
void setup(void)
{
u8x8.begin();
u8x8.setFlipMode(1);
u8x8.setFont(u8x8_font_chroma48medium8_r);
Serial.begin(115200);
// while (!Serial);
Serial1.begin(9600);
Serial.print("ping pong communication!\r\n");
u8x8.setCursor(0, 0);
if (at_send_check_response("+AT: OK", 100, "AT\r\n"))
{
is_exist = true;
at_send_check_response("+MODE: TEST", 1000, "AT+MODE=TEST\r\n");
at_send_check_response("+TEST: RFCFG", 1000, "AT+TEST=RFCFG,866,SF12,125,12,15,14,ON,OFF,OFF\r\n");
delay(200);
# ifdef NODE_SLAVE
u8x8.setCursor(5, 0);
u8x8.print("slave");
# else
u8x8.setCursor(5, 0);
u8x8.print("master");
# endif
}
else
{
is_exist = false;
Serial.print("No E5 module found.\r\n");
u8x8.setCursor(0, 1);
u8x8.print("unfound E5 !");
}
}
void loop(void)
{
if (is_exist)
{
# ifdef NODE_SLAVE
node_recv_then_send(2000);
# else
node_send_then_recv(2000);
delay(3000);
# endif
}
}

Credits

Abhinav Krishna

Abhinav Krishna

5 projects • 25 followers
Maker | IoT Enthusiast | Electronics hobbyist
Amritha M

Amritha M

1 project • 2 followers

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