A bit smaller, but bigger.
Step 1: The Project Continued
Well i had a 1.8 inch tft lcd with ST7735 driver which i have not used for a time now. Because of the 2.4 lcd i could not use the I2C interface to connect more sensors to the Arduino Uno i decied to rewrite the sketch to fit my needs. I added a BMP280 barometric pressure sensor and a DS3231 RTC to display time and barometric pressure.
Step 2: Parts Needed
- Arduino Uno, Nano, Pro mini, Mega2560 etc.
- BMP280 barometric pressure sensor
- DS3231 RTC
- 1.8 inch tft lcd ST7735
- DHT11 or DHT22
- Libraries and sketch
Step 3: Software
I made 2 sketches. One is with RTC and the second is without the RTC.
Step 4: Connections
- CS Digital 9
- RST Digital 7
- DC Digital 8
- SCLK Digital 13
- MOSI Digital 11
- VCC 3.3 volt
- GND ground
- LED 5 volts
VCC: I strongly advise only 3.3 volt
SCL: Analog 5
SDA: Analog 4
Vcc: 3.3 or 5 volts
DS18B20: Digital 6
DHT11/22: Digital 10
Analog LDR: Any analog pin that is free
Step 5: Finally
You are done and assembled a very cheap and accurate weather station.
Basically it is the same as the previous one, but it uses another lcd. For displaying the time i thought a simple string will be more than enough.
tft.print(rtc.getTimeStr(FORMAT_SHORT)); // FORMAT_LONG for displaying seconds ; But it is a bit much for the Nano, displaying seconds is delayed
You still can add more sensors if you want, because we have a few digital and analog pins still free not to mention the I2C bus. The only limit is the lcd resolution :)
I hope you will have a good use for it.
Thank you for reading my instructable.