lcd module sd card reader arduino quotation

Let me start with where I started, I am working on a project involving and arduino and a display that I want to display a new quote once a day for a month, before needing to have new quotes loaded. I decided, because I wanted to run it off of battery power to try and use an e-paper display, I originally purchased a pervasive display 4.41 inch display along with an Arduino Uno. I was able to get the two talking over SPI, I was also able to send basic commands like refreshing the display, however, I soon realized that the display require 15K bytes of image data to be sent each time I want to load new image data. I decided to move up to and Arduino Due, which I was bale to get talking again, however, it stopped working, and I was have intermittent problems, to the point where I reconnected the Uno and even previous code I had written would not work as I expected. I can only assume I cooked something on the pervasive display timing controller? If anyone has a suggestion regarding this I would appreciate it.

I have now decided to try going with a regular LCD display, I am thinking about the 20X4 character display for simplicity"s sake. The next question would be how can someone who does not want to go into the code to change the quotes change them, I am assuming I would need to incorporate some sort of SD card interface.

The Arduino TFT screen is a backlit LCD screen with headers. You can draw text, images, and shapes to the screen with the TFT library. There is an onboard micro-SD card slot on the back of the screen that can, among other things, store bitmap images for the screen to display.

The screen"s headers are designed to fit into the socket on the front of the Arduino Esplora, but it is compatible with any AVR-based Arduino (Uno, Leonardo, etc) or with the Arduino Due. The TFT library interfaces with the screen"s controller through SPI when using the TFT library.

The Arduino TFT library extends the Adafruit GFX, and Adafruit ST7735 libraries that it is based on. The GFX library is responsible for the drawing routines, while the ST7735 library is specific to the screen on the Arduino screen. The Arduino specific additions were designed to work as similarly to the Processing API as possible.

The TFT library relies on the SPI library, which must be included in any sketch that uses the scree. If you wish to use the SD card, you need to include the SD library as well.

Often times, we have the need for a way to store data in our projects, and most of the time, the EEPROM which comes readily to mind has a limited storage capacity, and issues with the format and nature of data it can hold. All this and more makes it probably not the best for storing data like text, CSV, audio, video or image files. To get around this we could use an SD card to store the data, and remove the card when we need to view on some other platform etc. That is why today’s project is focusing on how to interface an SD card module with an Arduino.

The Arduino Micro SD card Module is an SPI Communication based device. It is compatible with the TF SD cards used in mobile phones and can be used to provide some sort of external storage for micro controller and microprocessor based projects, to store different kind of data types from images to videos. SD cards generally are 3.3v logic level based devices, but with the aid of the Micro SD card module, the signals are converted to 5v via a logic level converter implemented on the SD card Module.

The SD card module as earlier stated, communicates with the arduino over the SPI (serial Peripheral interface) communication protocol and it is connected to the arduino hardware SPI pins. The SPI pins on an Arduino differs from one arduino to the other, but on the UNO which was used for this project, it is found between pin 10 to 12. To further highlight the connection made in the fritzing schematics above, below is a pin map of the connection between the SD card and the Arduino Uno;

The code for this tutorial will be based on the standard SD.h arduino library. It is one of the libraries that comes with the the installation of the IDE. The aim of this code is to basically show us the functions that can be performed with the SD card module, including read, write, etc.

So to jump right in, the first thing we do in the code is include the libraries that we will be using as shown below. We will basically be using the Arduino SD library and the SPI.h library which allows us to easily use the Arduino hardware SPI.

After the libraries have been declared, the next thing we do is declare the pin to which the CS pin of the SD card module is connected to the arduino. The CS pin is the only one that is not really fixed as any of the Arduino digital pin. We didn’t need to declare the other SPI pins since we are connected to the generic SPI pins and we have the SPI library included. After declaring the pin, we then create an object file, which will be used later on to store data on the SD card.

Next we move to the setup() function of the arduino code. The first thing we do is start the serial communication at 9600 baud rate. We then initialize the SD card with the next line of code, after which we create a file named test.txt and then write to it using the writeToFile() function. After writing to the file, it is closed. This section of the void setup() function was just used to demonstrate how easy it is to write  text/data to a file.

Since this was just a demo sketch to show how to read and write files, there was no point to run the code multiple times so they were all placed in the void setup() function which runs just once, instead of putting it in a void loop which runs for as long as you have power. Thus the void loop was included but with nothing inside, as you may have noticed, your arduino code will not compile without the void loop() function included. After the loop() function,are the code for the functions that were used under the void setup(), to read or write to the SD card.

Copy the code above and paste it into the Arduino IDE, Upload it to your board and you should see something like what is displayed below on your serial monitor.

Often times, we have the need for a way to store data in our projects, and most of the time, the EEPROM which comes readily to mind has a limited storage capacity, and issues with the format and nature of data it can hold. All this and more makes it probably not the best for storing data like text, CSV, audio, video or image files. To get around this we could use an SD card to store the data, and remove the card when we need to view on some other platform etc. That is why today’s project is focusing on how to interface an SD card module with an Arduino.

The Arduino Micro SD card Module is an SPI Communication based device. It is compatible with the TF SD cards used in mobile phones and can be used to provide some sort of external storage for micro controller and microprocessor based projects, to store different kind of data types from images to videos. SD cards generally are 3.3v logic level based devices, but with the aid of the Micro SD card module, the signals are converted to 5v via a logic level converter implemented on the SD card Module.

The SD card module as earlier stated, communicates with the arduino over the SPI (serial Peripheral interface) communication protocol and it is connected to the arduino hardware SPI pins. The SPI pins on an Arduino differs from one arduino to the other, but on the UNO which was used for this project, it is found between pin 10 to 12. To further highlight the connection made in the fritzing schematics above, below is a pin map of the connection between the SD card and the Arduino Uno;

The code for this tutorial will be based on the standard SD.h arduino library. It is one of the libraries that comes with the the installation of the IDE. The aim of this code is to basically show us the functions that can be performed with the SD card module, including read, write, etc.

So to jump right in, the first thing we do in the code is include the libraries that we will be using as shown below. We will basically be using the Arduino SD library and the SPI.h library which allows us to easily use the Arduino hardware SPI.

After the libraries have been declared, the next thing we do is declare the pin to which the CS pin of the SD card module is connected to the arduino. The CS pin is the only one that is not really fixed as any of the Arduino digital pin. We didn’t need to declare the other SPI pins since we are connected to the generic SPI pins and we have the SPI library included. After declaring the pin, we then create an object file, which will be used later on to store data on the SD card.

Next we move to the setup() function of the arduino code. The first thing we do is start the serial communication at 9600 baud rate. We then initialize the SD card with the next line of code, after which we create a file named test.txt and then write to it using the writeToFile() function. After writing to the file, it is closed. This section of the void setup() function was just used to demonstrate how easy it is to write  text/data to a file.

Since this was just a demo sketch to show how to read and write files, there was no point to run the code multiple times so they were all placed in the void setup() function which runs just once, instead of putting it in a void loop which runs for as long as you have power. Thus the void loop was included but with nothing inside, as you may have noticed, your arduino code will not compile without the void loop() function included. After the loop() function,are the code for the functions that were used under the void setup(), to read or write to the SD card.

Copy the code above and paste it into the Arduino IDE, Upload it to your board and you should see something like what is displayed below on your serial monitor.

This microSD (uSD) breakout board makes connecting a microSD card to your project a cinch. It functions using the "SD" interface (quad-SPI) or standard 4-wire SPI. The uSD card pins are broken out to a 0.1" header that is ideal to connect with a microcontroller dev board such as a Seeeduino or an ESP32 DevKit.

Connecting an uSD card to your project allows you to display images that exceed your microcontroller"s available memory. Perfect for all display types, including OLED, TFT, ePaper, etc. We use an uSD card and breakout board to show image slideshows on little OLED displays, as well as hold large demos for our EVE display modules, and playing a video on a TFT.

This uSD breakout board is designed for 3.3v microcontrollers like the Seeeduino or Raspberry Pi. To use with a 5v source, it will require external level shifters for each signal.

I want to use the SD card slot on my ""RepRapDiscount Full Graphic Smart controller"" to read and write data to and from it to my SD card. My question lays in the connection. I…

This tutorial will explore the range of capabilities available to the Arduino SD library by using a real-world example of data logging. The SD library allows users to read/write, list files, create/remove files, and make/delete directories. Additionally, we will develop an algorithm that creates a new file every time the Arduino board is restarted, which will prevent overwriting of existing data records. The resulting data file will be in comma separated format and contain multiple data points, including a time stamp in milliseconds since the program started. Therefore, it is important to record the program start time. For very accurate time monitoring tasks, a real-time clock is recommended, however, for the experiments conducted here, relative time suffices.

The primary components used for this tutorial are the Arduino board and SD card module, as such, those are the only required components. However, a real-world example will be carried out with the BME280 pressure sensor, which outputs pressure, temperature, and humidity. It also contains an algorithm that converts pressure to altitude - so we will be logging that as well. A lithium-polymer (LiPo) battery will be used so that the datalogger can be portable, which requires a breadboard and 3.7V to 5.0V regulator to also be required. Resultantly, the entire parts list is given below for the portable datalogger:

We will start by wiring the entire set of parts to the Arduino board. This will allow us to move from dealing with just the SD card to saving and storing data to the SD card from the BME280 pressure sensor. The wiring digram is shown below:

This tutorial focuses on creating files and saving data to them in a simple and ready-to-use format. Assuming the SD module is correctly wired to the Arduino module adherent to the diagram above, we can start by reading and writing files to the SD card. The micro SD card must be formatted using the FAT16 file system as per the suggestions on the Arduino website [here]. Below is a simple routine that writes and reads data to the SD card, ensuring that the wiring and formatting were done properly:

The code above looks for a file called “test.csv” and deletes it if it already exists and creates it if it doesn’t. Then the program saves headers called “Timestamp” and “Data.” It opens and closes the “test.csv” file each loop and saves the milliseconds since the program started and an iterating integer. If we subsequently run the built-in Arduino SD script called “DumpFile” - which dumps the contents of an SD card, we can see just how the test script above prints out its data to the SD card:

We can also run the built-in Arduino script called “listfiles” to further ensure that our script is working properly. At the top of the printout from listfiles, the “test.csv” file should be printed with its approximate size. These checks all ensure that our program is working properly, along with our SD card module and micro SD card. Moreover, if the user wants to surely verify that the data is being saved, they can always eject the micro SD card and read it on a computer via the USB port. Excel or a similar program should easily read the .csv data.

Ideally, we don’t want to be deleting files and would prefer to iterate over existing files to create an array of files that make sense chronologically. In this tutorial, I will only work with the root directory and create files based on a particular naming convention. Using this convention, we will be able to create up to 1000 unique files running the same program without overwriting. I have created a simplified script based on the “listfiles” SD routine which will list all the files in the root directory of the SD card. That routine is printed below.

The BME280 is wired in I2C mode such that pressure, temperature, and humidity can be read using the “Wire” library on the Arduino. The BME280 library can be downloaded from Adafruit’s website. We will be logging temperature, humidity, pressure, and calculated altitude. To start, I have included a simple demo of the BME280 that prints the aforementioned variables as comma separated values to the serial port. The code is shown below.

Now that we have an idea of what to expect from both the SD module and BME280 pressure sensor, we can save the data to the SD card and verify the results. The full BME280 SD saver code is shown below, which is essentially an implementation of the BME280 code above and the SD saver method, along with the naming convection discussed above that prevents overwriting. The full code is given below and at the project’s GitHub page.

In this tutorial, a simple datalogging system using Arduino was explored using a novel file saving method and real-world data. Using the methods outlined above, the BME280 pressure sensor outputted temperature, humidity, pressure, and altitude, all of which were saved to a unique file onto an SD card. The SD card method is useful for situations where users want to save data over a long period or use a portable solution for taking measurements. Once the data is saved onto the SD card, the user can take the data and process it on any platform by parsing the data using the simple comma separated formatting. This allows for a range of applications in weather, drones, indoor positioning, and other fields where portable or long-term data acquisition is important.

The proposed non-contact thermometer can measure body temperature of a person at forehead and records it in a text file on a SD card with time and temperature. If a person has abnormal body temperature the machine will alert by beeping.

MLX90614 can operate between 3.3V and 6V if your sensor comes with a breakout board as illustrated in the above image, because the breakout board comes with a voltage regulator. MLX90614 sensor works on I2C bus which makes interfacing with Arduino easy and it can be done by just hooking up the SDA and SCL lines to Arduino.

Generally, interfacing a micro SD card directly with any microcontroller is technically challenging, a micro SD card adapter module such as one illustrated above makes it easy.

This SD card adapter module regulates correct supply voltage and signal voltage to the SD card. This module consists of 3.3V on-board regulator and a level shifter IC which is responsible converting 5V signal from Arduino to 3.3V signal to SD card.

This module communicates with Arduino via SPI protocol and we need to establish four communication lines between Arduino and this SD card module which are MISO, MOSI, SCK and CS.

The proposed project utilizes a RTC module DS3231 or DS1307 (both are compatible) for registering correct time with the temperature when a person scans his/ her body with this machine.

The RTC module is responsible for tracking the correct time, it also comes with a backup battery which will keeps the RTC running even when the main power supply is disconnect.

How to set time to RTC:Open Arduino IDE > File > Examples > DS1307RTC > SetTime > upload this code and the open serial monitor and time is set to RTC.

We are using an I2C display adapter module to reduce the number of wires that connects from Arduino to LCD so that we can build the circuit with ease. We just need to connect four wires: SDA, SCL, Vcc and GND otherwise we will be connecting 16 wires.