hi guys
i have problem with my project ....
i am doing Heart Rate Monitoring System My project have two circuits ...
1st circuit is to get the heart rate using LED and LDR by placing the finger for 30 second .The signal that we get from the LDR is passed to a microcontroller which is AT89C2051 .Which is programmed to calculate the heart rate and temperature . the temperature is obtained from a IC which is DS1621 this all obtained data should be showed in a LCD (all this is working perfectly for me )
second circuit should show the same data as the 1st circuit
To send the data to the second circuit I use a decoder and encoder and a RF module
The data should be sent from the microcontroller to the decoder to the RF module to the encoder then to the microcontroller (AT89C2051)
The problem of the project is that iam not getting the data at the second circuit LCD
I checked all the connection and I did test to the RF module and the encoder and decoder in othe circuit using LED method and it worked fine (means all the componet are ok I think ) the problem is iam not getting data out (no change in voltage) of the encoder to the microcontroller even I tried to connect the encoder and decoder directly but no response
i measure the voltage of the ports at the microcontroller to checked if there is data out
At the microcontroller
Pin 3 : the voltage at 0.27 V when the data is sending the voltage rise 4.14 V then it goes back to 0.27 V
Pin 11 : the voltage at 0.13 V when the data is sending the voltage rise 4.40 V then it goes back to 0.13 V
Pin 12: voltage at 0.23 V when the data is sending the voltage rise 4.36 V then it goes back to 0.23 V
Pin 13: the voltage at 0.21 V when the data is sending the voltage rise 4.36 V then it goes back to 0.21 V
the votage at the encoder HT12E
Pin 17 the voltage changing between 1.34V to 1.57V which is the output of the encoder
AT THE SECOND CIRCUIT
At the decoder HT12D
Pin 10 : the voltage is 4.48 V no change when the data is sending as well
Pin 11: the voltage is 4.48 V no change when the data is sending as well
Pin 12 : the voltage is 0.10 V no change when the data is sending as well
Pin 13 : the voltage is 0.10 V no change when the data is sending as well
Pin 14 the voltage changing between 1.20V to 1.32V which is the output of the encoder
i think the output from the decoder HT12D is no right so how i overcome this problem ? i appreciate helping me guys
i have problem with my project ....
i am doing Heart Rate Monitoring System My project have two circuits ...
1st circuit is to get the heart rate using LED and LDR by placing the finger for 30 second .The signal that we get from the LDR is passed to a microcontroller which is AT89C2051 .Which is programmed to calculate the heart rate and temperature . the temperature is obtained from a IC which is DS1621 this all obtained data should be showed in a LCD (all this is working perfectly for me )
second circuit should show the same data as the 1st circuit
To send the data to the second circuit I use a decoder and encoder and a RF module
The data should be sent from the microcontroller to the decoder to the RF module to the encoder then to the microcontroller (AT89C2051)
The problem of the project is that iam not getting the data at the second circuit LCD
I checked all the connection and I did test to the RF module and the encoder and decoder in othe circuit using LED method and it worked fine (means all the componet are ok I think ) the problem is iam not getting data out (no change in voltage) of the encoder to the microcontroller even I tried to connect the encoder and decoder directly but no response
i measure the voltage of the ports at the microcontroller to checked if there is data out
At the microcontroller
Pin 3 : the voltage at 0.27 V when the data is sending the voltage rise 4.14 V then it goes back to 0.27 V
Pin 11 : the voltage at 0.13 V when the data is sending the voltage rise 4.40 V then it goes back to 0.13 V
Pin 12: voltage at 0.23 V when the data is sending the voltage rise 4.36 V then it goes back to 0.23 V
Pin 13: the voltage at 0.21 V when the data is sending the voltage rise 4.36 V then it goes back to 0.21 V
the votage at the encoder HT12E
Pin 17 the voltage changing between 1.34V to 1.57V which is the output of the encoder
AT THE SECOND CIRCUIT
At the decoder HT12D
Pin 10 : the voltage is 4.48 V no change when the data is sending as well
Pin 11: the voltage is 4.48 V no change when the data is sending as well
Pin 12 : the voltage is 0.10 V no change when the data is sending as well
Pin 13 : the voltage is 0.10 V no change when the data is sending as well
Pin 14 the voltage changing between 1.20V to 1.32V which is the output of the encoder
i think the output from the decoder HT12D is no right so how i overcome this problem ? i appreciate helping me guys
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