I did a weather devices 2023.
It has first a outside transmitter, which two temperature sensors, a air pressure sensor, a humidity sensor, a light sensor.
It works with PIC18F2620 processor with 5 and 3.3V.
It will send all the data in every 10 seconds.
It sends the data with 2,4GHz radio with serial data to receiver.
It is inside, with radio receiver and a Bluetooth device so that it get data to my PC.
The data goes to hard disk as example 202309.log.
It is fully ASCII value like
09:26:47,10,23.00
09:27:07,12,84.91
09:27:07,13,98.60
It has first the time 09:27:47, then the measuring channel 10, the the value 23.00 (centigrade).
With this data is made a graphics for each month ( from 1999 to 2023).
This is a schematic of the transmitter and receiver.
It has a 5V power supply, which goes also to humidity sensor DHT22, but it has a limiting resistor 5.6k ohm, because the processor has 3.3V power supply.
It needs 3.3V power supply because the BME280 sensor works with 3.3V I2C system.
BME280 should have a temperature, a air pressure and a humidity, but my sensor does not work with humidity.
Then there is a NTC temperature resistor, which has working for me about 10 years,
There is also a light sensor resistor, which shows when the day starts .
The data is send every 10 seconds to radio receiver, which is inside.
The receiver has also a PIC18F2620 processor although it is not really needed.
From receiver the data goes with Bluetooth transmitter to my PC Bluetooth and from there to the hard disk.
In the PC there is a graphics program, which show the data every month a graphics.
The graphics shows only one day.
The air pressure is a little under 1000mB.
The humidity is first about 60 %, but then I moved the transmitter to outside and the humidity increases to 90-95%.
Light goes about 0 lux, but at morning it increase to 30-40 lux.
The both temperatures follow each other.
The morning temperature is about 10 degrees.
Here is the transmitter.
The receiver is almost the same.
The PIC18F2620 is a DIP version, because it has been a problem to get anything else from Microchip.
It has a normal RS232 connector so that i can see what happens inside the processor when I am developing a program.
Here is the on day data
Pekka Ritamaki moc.liamg|odg3ho#moc.liamg|odg3ho
