![]() It often directs the CS to pin 4 in different demos, i don't know why. So this is a typo (well, actually it is the pin 14 on the ATMEGA328 MCU chip which is connected to pin 10 on Uno) - connect to pin 4 to get it to work with the example code. Also in the code the SD.begin() is using the pin 4 as argument. ![]() In the figure however the yellow wire goes to pin 4. From the text above, the SD card CS (Chip Select) is pointed out to be wired to pin 14 at the Arduino. If you have another board please take a look at what pin setup your specific board is using. In this example the Arduino Uno board is used. Tft.I'd like to take moment to clarify some things and maybe dig a little bit deeper in whats what. Read data and store it to variables hum and temp Serial.print("Self Diagnostic: 0x") Serial.println(x, HEX) X = tft.readcommand8(ILI9341_RDSELFDIAG) Serial.print("Image Format: 0x") Serial.println(x, HEX) Serial.print("Pixel Format: 0x") Serial.println(x, HEX) Serial.print("MADCTL Mode: 0x") Serial.println(x, HEX) Serial.print("Display Power Mode: 0x") Serial.println(x, HEX) Uint8_t x = tft.readcommand8(ILI9341_RDMODE) read diagnostics (optional but can help debug problems) Serial.println("DHT22 temperature / humidity sensor Test") Initialize DHT sensor for normal 16mhz Arduino Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_MOSI, TFT_CLK, TFT_RST, TFT_MISO) ![]() If using the breakout, change pins as desired Use hardware SPI (on Uno, #13, #12, #11) and the above for CS/DCĪdafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC) For the LCD shield, these are the default. DHT22 Data line connected to Arduino digital IO 2 Adafruit ILI9341 library is modified for ILI9488 (320x480) Experiment of 3.5 Inch LCD (320x480), ILI9488 SPI Interface driver //And experiment of DHT22 digital temperature / humidity sensor The temperature is in Celsius format, which is converted into Fahrenheit, Kelvin and Rankine format by the software.Ī two column five row, multi colored table is drawn by using Arduino GFX lib, for displaying the temperature and humidity.Ĭonverted four formats of temperature are send to the serial port and also displayed on the TFT LCD. Included DHT library offers the read interface for the sensor.Īrduino reads the temperature and humidity values at 2 seconds interval. Writecommand(ILI9341_DFUNCTR) // Display Function Control Only, the Height and Width parameters at Adafruit_ILI9341.h file is modified toĪnd at the Adafruit_ILI9341.cpp file, at the function Adafruit_ILI9341::begin(void), the following lines are modified for adapting ILI9488 device (320x480 pixels). Install Adafruit GFX and Adafruit ILI9341 device libraries.Īdafruit ILI9341 library is best suitable for the ILI9488 device.Īdafruit ILI9341 library is modified for adopting ILI9488 LCD controller. The conversion formula for Celsius to other scale are given below. The sensor supports long transmission distance.Īrduino reads the temperature and humidity at 2 second interval and sends to the serial port as well as displays on LCD screen. Every DHT22 sensor of this model is temperature compensated and calibrated in accurate calibration chamber and the calibration-coefficient is saved in internal OTP memory. The DHT22 data pin is connected with Arduino digital IO pin, and pulled up to Vcc, via 10K ohm resistor.ĭHT22 (AM2302) outputs calibrated digital data signal. The temperature accuracy is ☐.1☌ (maximum). The ILI9488 is comprised of a 960-channel source driver, a 480-channel gate driver, 345,600 bytes GRAM for graphic data of 320 (RGB) x 480 dots, and power supply circuit.Īrduino SPI port is connected to the LCD ( D13- SCLK, and D11 – MOSI).Īrduino Digital IO pin D9 and D10 is connected to RS and CS pin of LCD.ĭHT22 digital temperature / humidity sensor delivers temperatures between -40☌ and +80☌ and humidity between 0% to 100%. The ILI9488 LCD Controller is a 16.7M single-chip SoC driver for a-Si TFT liquid crystal display panels with a resolution of 320(RGB) x 480 dots. The LCD is easily interfaced with Arduino SPI bus, and it needs minimum of four Digital IO lines. The TFT LCD (3.5 inch, 320x480 pixel, ILI9488 LCD controller), is used for this instructable. ![]()
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