8-bit means the processor uses an 8-bit register, which can handle 2^8 or 256 data values, which seems low for today’s standards, however, the higher the bit count and processing speed, the more power consumption the processor uses, hence, why microcontrollers are a favourable choice for low-power solutions.
THE ATMEGA328Pīriefly summarising, the ATmega328P is an 8-bit microcontroller that operates on a RISC architecture. Thus, we can implement the microcontroller only with its necessary components to a breadboard or custom designed printed circuit board.
#Atmega328p code#
Once we’ve uploaded our code to the microcontroller, all the additional connections and components on the development board may not be necessary, such as the USB connector, or female pin headers.
#Atmega328p series#
We’ve used the ATmega328P in its bare form in previous articles, however, let’s spend time just focusing on the ATmega328P, as you may learn something different from the Mega series in its wild form, outside its usual Arduino habitat.īut why use the ATmega328P on its own and not just stick to the development board? Simply put, we can significantly reduce the size of our projects. Generally speaking, the main reason we’ve heard of the ATmega328P is from using an Arduino, a development board centred around the Mega series of microcontrollers, specifically the Uno and Nano, which use different packages of the ATmega328P. This humble microcontroller is cheap, robust, and easy to program, the backbone of many maker projects.
#Atmega328p how to#
We take a look at this versatile chip, different ways to program it, and how to use one standalone.īeing part of the maker family generally means at some point or another you’ve encountered an ATmega328P. Serial.The ATmega328P is the brains of many Maker projects. If (startFlag || (millis() - prevTimeDHT > DHT_TIMEOUT)) If (millis() - prevTimeDisplay > DISPLAY_TIMEOUT) Instead if using delay for the DHT22, I used millis like used with the Display to delay and only measure once every 30 seconds. How can I achieve this, can someone guide me? I have also tried to use interrupts for this, but the OLED display does not sleep in the interrupt code oled.ssd1306_command(0xAE) //this does not work in interrupt subroutine But if I remove the code of delay, it does not function properly, because it is not able to turn the display on as the code is predominantly in the delay phase. OledDispla圜enter(tempString, humString) // display temperature and humidity on OLEDĪs you can see currently I have commented out the delay of 30 seconds and the code is working. 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. Hi I am trying to make a project that uses DHT22 (Temperature & Humidity Sensor) and SSD1306 (OLED Display) with the ATMega328p.
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