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Crowbits-2G Module


Crowbits- OLED is constructed from 128 x 64 dot matrix OLED module. The display offers high brightness, self-emission, high contrast ratio, slim/thin outline, wide viewing angle, wide temperature range and low power consumption.



  • GSM
  • Easy to use


  • Interface Type: UART
  • Operating Voltage: 3.3V DC
  • Dimensions: 56(L)*31(W)*13(H)mm


The following sketch demonstrates a simple application of the module.

1. You need to prepare a Crowbits motherboard, such as Crowbits-UNO board. And Crowbits-Key Board module.

2. Connect the module to the D4 and D5 interface of the Crowbits-UNO board, and Crowbits-Key Board connect the MIC interface of the Crowbits-2G Module. As shown in the figure:

Crowbits-2G Module-Wiki 1.JPG

3. Upload the following code to the Crowbits-UNO board.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(4, 5); // RX, TX

void setup() {
  // Open serial communications and wait for port to open:
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only

  Serial.println("test uart!");

  // set the data rate for the SoftwareSerial port

void loop() { // run over and over
  if (mySerial.available()) {
  if (Serial.available()) {

4. After the upload is successful, open the serial port monitor, the baud rate is set to 9600. Then send a command to call.

  • AT return OK // The serial port connection is normal
  • AT+CREG? Return +CREG: 0,1 // Indicates successful network registration
  • AT+CSQ //Test signal strength
  • ATD10086; //Call
  • ATH // hang up the phone
  • ATA // answer the phone

Crowbits-2G Module-Wiki 2.jpg