When the person in the video opens a serial port reader (CoolTerm), he begins to see data showing up in the console without configuring anything (just pushes start). Then the output of the ADC is programmed to be sent over USB to the host computer. One of the interdependent signals triggers the internal ADC to read the sensor output via DMA (4th internal signal). Basically there is a master clock signal, and two other signals which are interdependent. In fact, I have replicated each and every setting to match what the video shows. This video tutorial that I have been following has the same configuration. Middleware -> USB_DEVICE -> Communication Device Class (Virtual Port Com).Connectivity -> USB_OTG_FS -> Device_Only.RCC -> HSE -> Crystal/Ceramic Resonator.I have the following configuration regarding connectivity: I confirmed (using a logic analyzer) that the code is generating the correct signals. I have programmed the board via CubeIDE and the program flashes onto the board without any problems. I generate 3 clock signals to drive the sensor. I have been trying to interface a sensor using an STM32F401RE Nucleo board but failing to receive sensor data from the board. The following screenshot shows a call made from the SIM900 shield.I am very new to STM32s. println( "ATH") //hang up updateSerial() println( "ATD ZZxxxxxxxxxx ") // change ZZ with country code and xxxxxxxxxxx with phone number to dial updateSerial() Once you send SMS to the SIM900 shield, you will see the following output on the serial monitor. println( "AT CNMI=1,2,0,0,0") // Decides how newly arrived SMS messages should be handled updateSerial() The screenshot below shows the SMS sent from the SIM900 shield. print( "Last Minute Engineers | ") //text content updateSerial() println( "AT CMGS=\" ZZxxxxxxxxxx\"") //change ZZ with country code and xxxxxxxxxxx with phone number to sms updateSerial() println( "AT CMGF=1") // Configuring TEXT mode updateSerial() Any number other than these two indicates that you are not registered to any network. 1 indicates that you are registered to a home network and 5 indicates a roaming network. The second number in the output response should be 1 or 5. Note that this signal strength depends on your antenna and location!ĪT CCID – It checks whether the SIM card is valid or not and sends the SIM card number.ĪT CREG? It checks whether you are registered to the network or not. The first number in the output response is the signal strength in dB. You can then send some commands to query the chip and get information about it.ĪT CSQ – It checks ‘Signal Strength’. If all is well, it sends the OK message, telling you that it is understanding you correctly. Now that we have established a basic connection, we will try to communicate with the SIM900 shield by sending AT commands.ĪT – This is the most basic AT command. You should see the output below on the serial monitor. Once you have uploaded the sketch, open the serial monitor at baud rate 9600. read()) //Forward what Software Serial received to Serial Port read()) //Forward what Serial received to Software Serial Port println( "AT CREG?") //Check whether it has registered in the network updateSerial() println( "AT CCID") //Read SIM information to confirm whether the SIM is plugged updateSerial() println( "AT CSQ") //Signal quality test, value range is 0-31, 31 is the best updateSerial() println( "AT") //Handshaking with SIM900 updateSerial() Begin serial communication with Arduino and SIM900 Begin serial communication with Arduino and Arduino IDE (Serial Monitor) SoftwareSerial mySerial( 7, 8) //SIM900 Tx
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