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Recent content by maheshece28

  1. M

    Cannot send sms from M95 Quectel GSM Module-PIC24F

    Hi guys, I'm trying to send a SMS from my Modem(PIC24FJ128GA202 interfaced with M95 Quectel GSM) to my mobile phone. I've successfully read received SMS from my mobile. But cannot send SMS from my modem. I thought that i'm doing something wrong while i give ctrl+z. I've tried appending "\r\n"...
  2. M

    count pulse twice or thrice for one revolution-PIC

    Hi Guys, Thanks for the replys. Is betwixt said about this? R=10k and C=100nF ceramic capacitor. My sensor output is 5v.
  3. M

    count pulse twice or thrice for one revolution-PIC

    I'm trying to find RPM of a dc motor using PIC24F microcontroller. I've 200 RPM DC motor and IR sensor. I'm counting the pulse input from IR sensor when black material which attached with DC motor shaft contact with IR sensor. I'm printing pulse count for every 60 seconds using PIC timer...
  4. M

    [SOLVED] HTTP POST with authorisation using Quectel M95?

    I'm trying to do a POST method in my PIC24F which is interfaced with M95 Quectel module. I've successfully done the post method. Now in the server side added the security i.e authorization. In M95 Quectel module HTTP datasheet doesn't mention the authorisation. They have mentioned only httpurl...
  5. M

    [SOLVED] Connecting Ultrasonic sensor rx and tx to PIC24F uarts?

    Thanks FvM.
  6. M

    [SOLVED] Connecting Ultrasonic sensor rx and tx to PIC24F uarts?

    Hi guys, I've ultrasonic sensorhttps://www.aliexpress.com/store/product/Non-Touched-Ultrasonic-Fuel-Sensor-with-high-accuracy-support-RS232-port/324675_1902626979.html. I've tested this by connecting rx and tx of sensor to my PC DB9 via RS232 protocol. I received data streams which...
  7. M

    Communicating two microcontroller using RS485. Receiving junk data in receiver side..

    Each PIC board has one common ground. Is that have to connect/short those ground?
  8. M

    Communicating two microcontroller using RS485. Receiving junk data in receiver side..

    I changed the code as uartsend(uartrec4()); Now im not receiving junk data, instead i receive nothing in my hyperterminal.
  9. M

    Communicating two microcontroller using RS485. Receiving junk data in receiver side..

    Hi. Thanks for the reply. That's UART1 send string also. Pls check my UART1 code void uartsend(char in_c) { while(U1STAbits.UTXBF == 1); U1TXREG = in_c; } void uart1str( char *s) { while(*s!='\0') { uartsend(*s); s++; } }
  10. M

    Communicating two microcontroller using RS485. Receiving junk data in receiver side..

    Hi, I would like to send and receive data between two PIC24F microcontrollers via RS485. Here i'm using SP3485 IC. I've set one microcontroller as transmitter and another one has receiver. My microcontroller has 4 uart. One of the uart(here i use UART4) is connected with RS485 IC(SP3485) for...
  11. M

    [SOLVED] How to check rs232 to rs485 converter?

    Thanks for reply guys. Finally i've used another rs485 IC then connected and tested with arduino board. I just transmit the string via arduino to rs232 to rs485 converter i.e arduino---->RS485 IC----->RS232 to RS485 converter----->Laptop hyperterminal. I can receive data from arduino and see it...
  12. M

    [SOLVED] How to check rs232 to rs485 converter?

    Hi guys, I'm having a ICP CON rs232 to rs485 converter. I dont know how to check whether it is working or not?. I've only one rs232 to rs485 converter and usb to serial converter. My rs232 to rs485 converter has a operating voltage is 10-30v dc. i gave power supply of 12v dc with...
  13. M

    Circuit for backup battery connection with 12/24vDC vehicle battery

    Thanks for the reply and circuit diagram. Can i use this circuit for 24vDC vehicle battery?
  14. M

    Circuit for backup battery connection with 12/24vDC vehicle battery

    Hi guys, I've a vehicle tracking modem which is going to connect in a vehicle has 12v/24vDC battery. I just need to connect a backup battery(12vDC) to modem for uninterrupt power supply i.e if 12vDC/24vDC battery goes off, want to switch over to backup battery. Also the backup battery...
  15. M

    [PIC] preliminary checks for GSM modem

    Hi paulfjujo, Thanks for the reply. Yes its is M95 Quectel.
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