Front view                                              Rear view

                    The narrow trace is the outside temperature graph.
                    The wide trace is the pressure graph.

• 3 days of recording every 30 minutes.
• Measurement Range: Barometer; 95.0 to 105.0 kPa, resolution 1mb. Thermometer; -35 to +35 C.
• Mesurement and graph scales of 1 mb and 0.5 C resolution.
• Automatic switching between the 2 temperature scales; -35 < +15C for winter and  -15 < +35C for summer.
• Day of the week, time, present temperature and pressure display on the first line.
• ENGLISH MARKING  for day of the week and time header availlable.
• Display Optrex 160 X 128 pixels, LED backlighted.  DK part #   73-1181-ND.
• PIC16F876-20/P.
 

• A DECREASE IN BAROMETRIC PRESSURE ANNONCES BAD WEATHER, RAIN, WIND,STORM, HEAT.
• A RISE OF BAROMETRIC PRESSURE ANNOUNCES NICER, DRY, COLDER WEATHER.
 
1- A slow, regular and moderate fall in pressure indicates that a low pressure area is passing
     at a good distance. There should not be any marked change in weather.

2- A sudden decrease, even if it is small, announces a nearby disturbance; normally meaning
     wind, short showers. If large in 5 to 6 hours, signals a comming storm.

3- A large, slow and maintained decrease announces a long period of bad weather.
     This bad weather will be more pronounced if the barometer started higher to go lower.

4- A sudden rise of the pressure, when the pressure is about average or above
     average and the weather is nice, always announces the aproach of a low and the barometer
     will soon start to come down.

5- A rapid rise when the pressure is low, annonces a short period of nice weather;
     but, if the rise is large and prolonged, we can count on a many days of good
     weather.

6- A sharp change in temperature indicates a change in air mass and wind direction.
Read a more elaborate text on barometric pressure
 
Recorder's Parts list.
Schematic.
The PCB in tango format is availlable by writing to me
Construction and operation text.     Read it carefully if you intend to construct the recorder.
 

PCB and a pre-programmed PIC availlable by writing to me at [email protected].