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 300 dpi.
Construction and operation text.     Read it carefully if you intend to construct the recorder.