---
title: "EC-M11-BC-C4-LTE – USER GUIDE"
description: "## Programming  The NORVI EC-M11-BC-C4-LTE has a mini USB port for serial connection with the SoC for programming. Any ESP32-supported programming IDE can be used to program the controller. Follow this guide to programming NORVI ESP32-based controllers with the Arduino…"
url: "https://norvi.io/docs/norvi-ec-m11-bc-c4-lte-user-guide/"
updated: "2026-03-19"
category: "OTHER PRODUCTS / EC-M11-BC 4G LTE / EC-M11-BC-C4-LTE"
---

# EC-M11-BC-C4-LTE – USER GUIDE

## Programming 

The NORVI EC-M11-BC-C4-LTE has a mini USB port for serial connection with the SoC for programming. Any ESP32-supported programming IDE can be used to program the controller. Follow this guide to programming NORVI ESP32-based controllers with the Arduino IDE.

SoC: ESP32-WROOM32
Programming Port: USB UART

## Wiring, thermocouple input, and solar

### 8-pin and 3-pin connectors and wire harness

![](https://norvi.lk/wp-content/uploads/2023/10/df-1024x348.jpg)

### Pin Description

| **8P Male** | **Wire color** | **I/O Configuration** |
| --- | --- | --- |
| 1 | White | Thermocouple + |
| 2 | Brown | Thermocouple - |
| 3 | Green | - |
| 4 | Yellow | - |
| 5 | Gray | - |
| 6 | Pink | - |
| 7 | Blue | - |
| 8 | Red | - |

| **3P Male** | **Wire color** | **I/O Configuration** |
| --- | --- | --- |
| 1 | Blue | Solar Panel + |
| 2 | Black | Not in Use |
| 3 | Brown | Solar Panel - |

### Thermocouple Input

| SPI MISO | GPIO19 |
| --- | --- |
| SPI SCK | GPIO18 |
| CS | GPIO5 |

### Programming Thermocouple Inputs

```cpp

                #include <SPI.h>
#include "Adafruit_MAX31855.h"
#define MAXDO  19
#define MAXCS   5
#define MAXCLK 18                // Initialize the Thermocouple
Adafruit_MAX31855 thermocouple(MAXCLK, MAXCS, MAXDO);

void setup() {
  Serial.begin(115200);
  Serial.println("MAX31855 test");             // Wait for MAX chip to stabilize
  delay(500);
  Serial.print("Initializing sensor...");
  if (!thermocouple.begin()) {
    Serial.println("ERROR.");
    while (1) delay(10);
  }
  Serial.println("DONE.");
}

void loop() {
  Serial.print("Internal Temp = ");
  Serial.println(thermocouple.readInternal());
  double c = thermocouple.readCelsius();
  if (isnan(c)) {
    Serial.println("Thermocouple fault(s) detected!");
    uint8_t e = thermocouple.readError();
    if (e & MAX31855_FAULT_OPEN) Serial.println("FAULT: Thermocouple is open - no connections.");
    if (e & MAX31855_FAULT_SHORT_GND) Serial.println("FAULT: Thermocouple is short-circuited to GND.");
    if (e & MAX31855_FAULT_SHORT_VCC) Serial.println("FAULT: Thermocouple is short-circuited to VCC.");
  } else {
    Serial.print("C = ");
    Serial.println(c);
  }
  //Serial.print("F = ");
  //Serial.println(thermocouple.readFahrenheit());
  Serial.println("");
  Serial.print("Analog Read : ");
  Serial.print(analogRead(36));
  Serial.println("");
  delay(1000);
}
```

### LTE1 Communication

| Model of LTE Modem | SIM7000-E |
| --- | --- |
| FCC ID | 2AJYU-SIM7000 |
| TAC | 86615402 |
| RXD  | GPIO25 |
| TXD | GPIO26 |
| RESET | GPIO32 |
| POWER | GPIO22 |

GPIO Connections of LTE1 Communication

## LTE2 Communication

| Model of LTE Modem | SIM7500 |
| --- | --- |
| FCC ID | 2AQ9M-SIM7500 |
| TAC | 86147503 |
| RXD | GPIO25 |
| TXD | GPIO26 |
| RESET | GPIO32 |
| POWER | GPIO22 |

GPIO Connections of LTE2 Communication

### Programming LTE Communication

```cpp

                #define MODEM_RESET 32
#define MODEM_FLIGHT 22
#define MODEM_RX 26
#define MODEM_TX 25
long timer1;

void setup() {           // initialize both serial ports:
  Serial.begin(115200);
  pinMode(MODEM_FLIGHT , OUTPUT);       // FLIGHT MODE ENABLE
  pinMode(MODEM_RESET , OUTPUT);       // MODEM RESET PIN
  digitalWrite(MODEM_FLIGHT, HIGH);   // FLIGHT MODE
  MODEM_RESET_CYC();
  delay(2000);
  Serial2.begin(115200, SERIAL_8N1, MODEM_RX, MODEM_TX);
  Serial.println("SIM AT ATART >>>>>>>>>>>>>>");
  delay(2000);
  Serial2.println("AT");
  delay(2000);
  Serial2.println("AT+CPIN?");
  delay(2000);
  Serial2.println("AT+CNMP?");
}

void loop() {
  delay(3000);
  timer1 = millis();
  Serial2.println("AT");
  while(millis()<timer1+10000){
    while (Serial2.available()) {
    int inByte = Serial2.read();
    Serial.write(inByte);
    }
  }
  timer1 = millis();
  Serial2.println("AT+CPIN?");
  while(millis()<timer1+10000){
    while (Serial2.available()) {
    int inByte = Serial2.read();
    Serial.write(inByte);
    }
  }
  Serial.println("AT SCAN DONE");         // read from port 0, send to port 1:
  while (Serial.available()) {
    int inByte = Serial.read();
    Serial2.write(inByte);
  }
  while (Serial2.available()) {
    int inByte = Serial2.read();
    Serial.write(inByte);
  }
}

void MODEM_RESET_CYC() {
  digitalWrite(MODEM_RESET,HIGH );
  delay(1000);
  digitalWrite(MODEM_RESET,LOW );
  delay(1000);
  digitalWrite(MODEM_RESET, HIGH);
}
```

## Solar Input

| Solar Powered Model | CN3083  |
| --- | --- |
| Maximum Charge Current |  600mA  |
| Maximum Voltage |  6V  |
| Input Voltage monitor |  ADS1115 - 0x49 - AIN2 |

## Battery Input

| Battery Type | 103040 Lithium polymer battery |
| --- | --- |
| Nominal Capacity  | 1200mAh   |
| Nominal Voltage | 3.75V |
| Overcharge | 4.2V |
| Over-discharge Cutoff Voltage | 3V |

### Programming Solar and Battery

```cpp

                #include <Adafruit_SSD1306.h>
#include <Adafruit_ADS1X15.h>
Adafruit_ADS1115 ads1;
int analog_value = 0;

void setup() {
  Serial.begin(115200);// put your setup code here, to run once:
  Wire.begin(16,17);
  if (!ads1.begin(0x49)) {
    Serial.println("Failed to initialize ADS 1 .");
    while (1);
  }
}

void loop() {
  int16_t adc0, adc1, adc2, adc3;
  adc0 = ads1.readADC_SingleEnded(0);
  adc1 = ads1.readADC_SingleEnded(1);
  adc2 = ads1.readADC_SingleEnded(2);
  adc3 = ads1.readADC_SingleEnded(3);
  Serial.println("-----------------------------------------------------------");
  Serial.print("AIN1: ");
  Serial.print(adc0);
  Serial.println("  ");
  Serial.print("AIN2: ");
  Serial.print(adc1);
  Serial.println("  ");
  Serial.print("SOLAR: ");
  Serial.print(adc2);
  Serial.println("  ");
  Serial.print("AIN4: ");
  Serial.print(adc3);
  Serial.println("  ");
}
```