--- title: "NORVI GSM-AE07-R-L – USER GUIDE" description: "## **Programming** The NORVI GSM-AE07-R-L 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-gsm-ae07-r-l-user-guide/" updated: "2026-04-03" category: "NORVI GSM / NORVI GSM 4G LTE / NORVI GSM-AE07-R-L" --- # NORVI GSM-AE07-R-L – USER GUIDE ## **Programming** The NORVI GSM-AE07-R-L 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 ## **Digital Inputs**  #### **Wiring Digital Inputs** The digital inputs of the NORVI GSM-AE07-R-L can be configured as both Sink and Source connections. The inverse of the Digital Input polarity should be supplied to the common terminal. ![](https://norvi.io/wp-content/uploads/2024/09/3-3.png) NORVI GSM-AE07-R-L Digital Input Wiring #### **Programming Digital Inputs ** Reading the relevant GPIO of the ESP32 gives the value of the Digital Input. When the inputs are in the OFF state, the GPIO goes HIGH, and when the input is in the ON stage, the GPIO goes LOW. Refer to the GPIO allocation table in the [datasheet](https://drive.google.com/open?id=1SndGn-7Xd0NZzGo2mmDdVQ9Slgzbufde&usp=drive_fs) for the digital input GPIO. ```cpp #define INPUT1 34 void setup() { Serial.begin(9600); Serial.println("Device Starting"); pinMode(INPUT1, INPUT); } void loop() { Serial.print(digitalRead(INPUT1)); Serial.println(""); delay(500); } ``` ## **Relay Output** #### **Wiring Relay Outputs** ![](https://norvi.io/wp-content/uploads/2024/09/Relay-Output-Wiring-1.jpg) NORVI GSM-AE07-R-L Relay Output Wiring #### **Programming Relay Outputs** Reading the relevant GPIO of the ESP32 gives the value of the relay or transistor output.  Refer to the GPIO allocation table in the [Datasheet](https://drive.google.com/open?id=1SndGn-7Xd0NZzGo2mmDdVQ9Slgzbufde&usp=drive_fs)[ ](https://drive.google.com/open?id=1AAePBadVfCiXFN5CCQOC06MW4ylUyMHA&usp=drive_fs)for the relay/transistor output GPIO. ```cpp #define OUTPUT1 12 void setup() { Serial.begin(9600); Serial.println("Device Starting"); pinMode(OUTPUT1 , OUTPUT); } void loop() { digitalWrite(OUTPUT1, HIGH); delay(500); digitalWrite(OUTPUT1, LOW); delay(500); Serial.println(""); delay(500); } ``` ## **RS-485 Communication** ![](https://norvi.io/wp-content/uploads/2024/09/RS485-WIRING-1-1024x448-22.jpg) | Driver | MAX485 | | --- | --- | | UART RX | GPIO25 | | UART TX | GPIO26 | | Flow Control | GPIO22 | GPIO Connections of RS-485 #### **Programming RS-485** NORVI-GSM-AE07 series RS-485 connection uses a half-duplex mode of MAX485 transmitter with ```cpp #define RXD 25 #define TXD 26 #define FC 22 void setup() { Serial.begin(9600); pinMode(FC, OUTPUT); Serial1.begin(9600, SERIAL_8N1,RXD,TXD); } void loop() { digitalWrite(FC, HIGH); // Make FLOW CONTROL pin HIGH Serial1.println("RS485 01 SUCCESS"); // Send RS485 SUCCESS serially delay(500); // Wait for transmission of data digitalWrite(FC, LOW); // Receiving mode ON while (Serial1.available()) { // Check if data is available char c = Serial1.read(); // Read data from RS485 Serial.write(c); // Print data on serial monitor } delay(1000); } ``` ## **Built-in OLED Display** | Display driver | SSD1306 | | --- | --- | | Communication | I2C | | Module Address | 0x3C | | Resolution | 128 x 64 | 0.96 OLED Display Specification #### **Programming OLED Display** ```cpp #include #include #include #include #define SCREEN_WIDTH 128 // OLED display width, in pixels #define SCREEN_HEIGHT 64 // OLED display height, in pixels // Declaration for an SSD1306 display connected to I2C (SDA, SCL pins) #define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin) Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); void setup() { Wire.begin(16,17); if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x64 Serial.println(F("SSD1306 allocation failed")); for(;;); // Don't proceed, loop forever } // Show initial display buffer contents on the screen – // the library initializes this with an Adafruit splash screen. display.display(); delay(2000); // Pause for 2 seconds } void loop() { } ``` ## **Built-in Buttons** | Read mode | ADC (Analog to Digital Conversion) | | --- | --- | | Analog IO | GPIO36 | GPIO Connection of buttons ![](https://norvi.io/wp-content/uploads/2024/09/2-1-18.jpg) Built-in button Internal Schematic #### **Programming Buttons** ```cpp #define buttonPin 36 int buttonState = 0; void setup() { Serial.begin(9600); pinMode(buttonPin,INPUT); } void loop() { Serial.print("Button: "); buttonState = analogRead(buttonPin); delay(50); Serial.print(analogRead(buttonPin)); Serial.print("\tAnalog: "); delay(1000); } ``` ## **LTE Communication** | Model of GSM Modem | QUECTEL EC25 | | --- | --- | | FCC ID | XMR202008EC25AFXD | | TAC | 86675804 | | RXD  | GPIO33  | | TXD | GPIO32 | | RESET  | GPIO21 | | Model of GSM  Modem | SIM7500 | | --- | --- | | FCC ID | 2AQ9M-SIM7500 | | TAC | 86147503 | | RXD  | GPIO33 | | TXD | GPIO32 | | RESET  | GPIO21 | ## **Programming LTE Communication** ```cpp #define GSM_RX 33 #define GSM_TX 32 #define GSM_RESET 21 unsigned long int timer1 = 0; void setup() { // put your setup code here, to run once: Serial.begin(9600); Serial.println("Hello"); Serial2.begin(9600, SERIAL_8N1, GSM_RX, GSM_TX); pinMode(GSM_RESET, OUTPUT); digitalWrite(GSM_RESET, HIGH); timer1 = millis(); Serial2.println("AT"); while (Serial2.available()) { int inByte = Serial2.read(); Serial.write(inByte); } } timer1 = millis(); Serial2.println("AT+CPIN?"); while(millis()