30-08-2011, 03:12 PM
[attachment=15574]
This is actually a temperature logging System. Here 8 temperature sensors areconnected(4 shown in diagram for simplicity). values of all the sensors are sentserially by AT89C51 to pc. Software "DAQ System " takes these valuesand show them on its front panel, and also logs them to the data base "daq.mdb".we can set some parameters like set point , low limit ,and high limit . whentemperature of some sensor increases beyond set point ,the heater connected tocontroller (specific for that sensor) will be turned OFF( ON in opposite case ).Highlimit and low limits are for alarm. when temperature goes above high limit orbelow low limit the alarm will be turned on.
This is actually a temperature logging System. Here 8 temperature sensors areconnected(4 shown in diagram for simplicity). values of all the sensors are sentserially by AT89C51 to pc. Software "DAQ System " takes these valuesand show them on its front panel, and also logs them to the data base "daq.mdb".we can set some parameters like set point , low limit ,and high limit . whentemperature of some sensor increases beyond set point ,the heater connected tocontroller (specific for that sensor) will be turned OFF( ON in opposite case ).Highlimit and low limits are for alarm. when temperature goes above high limit orbelow low limit the alarm will be turned on.
