Dual Thermometer with serial output
This Dual Thermometer with serial output.It’s consist of a PIC16F876, MCP1047A temperature sensor ( X2 ), MCP1541 voltage reference and MCP6022A opamp. The display is a 2 row HD74780 based 2X16 char, SII L1652BIJ2 but any other display based on HD74780 can be used.The temperature sensor used has an analog output, with 500mV at 0C ( zero degree Celsius or centigrade ) and a sensitivity of 10mV/Centigrade. The output of the sensor is filtered in order to eliminate the noise and applied to the A/D inputs of the integrated 10Bits A/D contained in PIC 16F876. As voltage reference a MCP1541 is used . The typical output voltage is 4.096V – this is buffered with a MCP6022 Rail-to-Rail AO and used to power the temperature sensors.
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