![]() ![]() Serial.println(tempString + ", " + humString) HumString = "H: " + String(hum, 1) + " %" TempString = "T: " + String(temp, 1) + " C" If (displayOn = 1 & digitalRead(SCREEN_BTN_INPUT) = HIGH)įloat hum = dht.readHumidity() // read humidityįloat temp = dht.readTemperature() // read temperature If (displayOn = 0 & digitalRead(SCREEN_BTN_INPUT) = LOW) HumString.reserve(10) // to avoid fragmenting memory when using String TempString.reserve(10) // to avoid fragmenting memory when using String PinMode(SCREEN_BTN_INPUT, INPUT_PULLUP) // input when button pressedĭht.begin() // initialize DHT22 the temperature and humidity sensor PinMode(DHTPIN, INPUT) // input of DHT22 sensor data tCursor((SCREEN_WIDTH - width) / 2, SCREEN_HEIGHT / 2 + 2) tCursor((SCREEN_WIDTH - width) / 2, SCREEN_HEIGHT / 2 - height - 2) ![]() display on horizontal and vertical center Oled.getTextBounds(temp, 0, 0, &x1, &y1, &width, &height) Void oledDispla圜enter(String temp, String hum) Serial.println(F("SSD1306 allocation failed")) If (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) ![]() initialize OLED display with address 0x3C for 128圆4 #define SCREEN_BTN_INPUT 3 // pin connected to push button to turn screen on on clickĪdafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1) // create SSD1306 display object connected to I2C #define DHTPIN 2 // pin connected to DHT22 sensor #define SCREEN_HEIGHT 64 // OLED display height, in pixels #define SCREEN_WIDTH 128 // OLED display width, in pixels I want to minimize the power consumption. I also want the DHT22 to only record data every 30 seconds. I want the OLED Display to be normally off and should turn on for 5 seconds when a tactile push button is pressed. The second byte (0x53) will be echoed back by the MCU.Hi I am trying to make a project that uses DHT22 (Temperature & Humidity Sensor) and SSD1306 (OLED Display) with the ATMega328p. Wait for at least 20 ms and then the programming enable serial instruction 0xAC, 0x53, 0x00, 0x00 is sent to the MOSI pin. Power is applied to V CC while RESET and SCK are set to zero. ![]() Serial data to the MCU is clocked on the rising edge and data from the MCU is clocked on the falling edge. Set XA1:XA0:BS1:DATA = 100 1000 0000, pulse XTAL1 for at least 150 ns, pulse WR to zero. Programming mode is entered when PAGEL (PD7), XA1 (PD6), XA0 (PD5), BS1 (PD4) is set to zero. High means the MCU is ready for a new command, otherwise busy.īyte select 1 ("0" = Low byte, "1" = High byte)īyte select 2 ("0" = low byte, "1" = 2nd high byte)īi-directional data bus (output when OE is low) Reliability qualification shows that the projected data retention failure rate is much less than 1 PPM over 20 years at 85 ☌ or 100 years at 25 ☌. Perhaps the most common implementation of this chip is on the popular Arduino development platform, namely the Arduino Uno, Arduino Pro Mini and Arduino Nano models. ATmega328PB and ATmega328PB-AUTOMOTIVE (superset of ATmega328P) - has more UART, I2C, and SPI peripherals than ATmega328PĪTmega328 is commonly used in many projects and autonomous systems where a simple, low-powered, low-cost micro-controller is needed.A comprehensive list of all other members of the megaAVR series can be found on the Atmel website. Features ParameterĪ common alternative to the ATmega328 is the "picoPower" ATmega328P. The device achieves throughput approaching 1 MIPS/MHz. The device operates between 1.8 and 5.5 volts. The Atmel 8-bit AVR RISC-based microcontroller combines 32 KB ISP flash memory with read-while-write capabilities, 1 KB EEPROM, 2 KB SRAM, 23 general-purpose I/O lines, 32 general-purpose working registers, 3 flexible timer/ counters with compare modes, internal and external interrupts, serial programmable USART, a byte-oriented 2-wire serial interface, SPI serial port, 6-channel 10-bit A/D converter (8 channels in TQFP and QFN/ MLF packages), programmable watchdog timer with internal oscillator, and 5 software-selectable power-saving modes. It has a modified Harvard architecture 8-bit RISC processor core. The ATmega328 is a single- chip microcontroller created by Atmel in the megaAVR family (later Microchip Technology acquired Atmel in 2016). ![]()
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