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 LCD DUAL THERMO-METER
    

  

PIC16F876A Dual LCD Thermometer - Project only
PIC16F876A Dual LCD Temp Meter KIT
 
PIC18F4520 Multi-Purpose Sensor System Controller
 

 

  PIC 16F876A LCD Dual Thermo Meter:
  
FD-TH1
   
This PIC based LCD Temperature measurement project was planned to measure two Temperatures Simultaneously. It can be effectively used to measure your room temperature and may be used for measuring RF Amplifier Temp.  I made this project for a friend who wanted to measure inside & outside temp in a Vegetable cold storage. It worked very accurately and reliably for last few months.

In addition to LCD display, TH1 also produces DATA Logger output available at D9F connector which may be used for such purposes.

The Hardware is quite simple using a PIC16F876A & its two 10bit A/D measuring inputs. Temperature sensors are tiny 3 terminal MCP1047A.

Accurate reference is created for PIC by using MCP1541 which is a 4.096. Its buffered by a Rail to Rail Op.Amp MCP6022. A voltage divided is used to get 2.56V for sensors resulting in a simple calculation of T = Reading - 200/4

Data-Logger output is available at Pin RC6, in a serial output the TH1 will send the temperature readings every second using 9600/N/8/1 format. Please note that Output from TH1 is at TTL level.

A MAX232 level converter is necessary in order to feed this info to a RS232 port and any terminal program such as  HyperTerminal is suitable for this purpose. Project details of making an RS232 level converter is available on this site.

Two sensors are used. Sensors are encapsulated inside a 3.5mm phono jack and they were comfortable inside it! I wanted to place one sensor inside the project board but a fear of heat generated within the board (Especially from 7805 with backlight "on") made me move both sensors out-board for peace of mind!!

Sensors require a simple two core (2 wires in center and a shielding braid) shielded cable used for microphone/audio purposes.

Results of this LCD meter were very encouraging and I am sure many radio amateurs would like to place this meter in their project or in their ham shack to measure various temperature levels. (Not to forget the Kitchen!!) 

 

Completed PIC LCD Meter:

 

 

Click image to enlarge
 FD-TH1  Doc & Schematic:
     

Technical Info Doc
       
Schematic & Parts List Not ready yet
 

 

 Data Sheets & Firmware Download
 

 

MCP1541
TC1047
PIC16F876A Firmware

 

 
Price $ Buy on-line
Please consider New Project/Kits : 
"Multi-Purpose Sensor System Controller"
 

 

 

 
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