liquid crystal arduino library for the dfrobot i2c lcd displays in stock

The second step is to add the libraries to your arduino ide, to do that you go to sketch-> include library -> add zip library then find it in files. If it works, you should get a message saying it worked.

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The library allows to control I2C displays with functions extremely similar to LiquidCrystal library. THIS LIBRARY MIGHT NOT BE COMPATIBLE WITH EXISTING SKETCHES.

This module works with at least the LiquidCrystal I2C and LiquidCrystal_PCF8574 libraries available in the Arduino library manager. Address 0x3F worked for me since the A0, A1, and A2 jumpers are not shorted.

Recently purchased unit has a different address than the same part number purchased a year ago. It seems that if the small board is marked MH, the address is not going to be 0x27 or 0x20 but 0x3F. With that change of address, this display works and looks great.

Google for LCM1602 and you will find many pages that mention the board - including the pinouts stated above and sample programs using the Arduino library.

Heres the scoop. The library that works with this chip set is available at this link. http://www.play-zone.ch/en/fileuploader/download/download/?d=0&file=custom%2Fupload%2FFile-1345667375.zip

I liked the idea of the 4-wire interface, but I was disappointed that no documentation was available for this part. However after a night of hacking I got it to work with my Arduino Uno. I thought Id pass along the following information to spare others the trouble.

On the software side, you have to download and install a new LiquidCrystal_I2C library for Arduino, which has the capability to talk to the LCD display over the I2C bus. Heres a link to the library. Follow the example code for the DFRobot board, which turns out to have the same configuration as this LCD, and it should fire right up for you. The LCD has white characters on a backlit blue background, and looked great.

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I have an I2C LCD screen provided with a Sunfounder kit and certainly built by DFRobot or such a constructor (there is nothing written on the LCD), and an Arduino Uno R3 copy.

My issue is when I use lcd.print() to write a string on the LCD, only the first character of the string is printed. I can only print on other positions by using setCursor but only one character at a time.

I tried to change libraries (https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library, the one supplied with the LCD...), It always behaves the same!

The hello world from DFRobot also doesn"t work properly (first char only, again) (please note to make it display something with my LCD I have to change the address from 0x20 to 27).

Changing to marcoschwartz’s library still does not help: the LCD is still blank. (using the code in post-1; my DSL is down at the moment so I can’t try the official code with MQTT connection, and I doubt it would make any difference because I carefully copied everything related to LCD)

I have already tried swapping SDA/SCL lines, powering LCD at 3V3, and replacing the jumper wires. None of these helped. In each case, the red LED on the back of LCD lights up, but LCD itself remains blank.

The classic parallel LCD sometimes post a problem for projects that use a lot of Arduino pins. The least amount of pins you can use is six, excluding the power pins and the potentiometer contrast adjust (optional) pin. Thankfully, by using an I2C LCD "backpack", the pin use can be reduced to four!

At the center of the board is the PCF8547 controller by NXP. The row of pins is attached to the same row of pins on any HD44870-compatible LCD. The four pins on the side are the one you"ll attach to the Arduino or any I2C-supported microcontroller.

Some backpacks come with PCF8574T while some come with PCF8574AT. Each of this chips have their own I2C address! PCF84574T uses 0x27 while PCF8457AT uses 0x3F. These addresses are used in the sketch so they"re kinda important to know.

You can, in fact, change the I2C address via the I2C Address Set pads on the board.  A0, A1, A2 represent three bits that would be subtracted from the address. By default, each of these pads are connected to VDD or the positive supply. Soldering them connects them to GND. For example, if you were to solder pad A0, the address becomes 0x26 because 0x27 - (A2 + A1 - A0) = 0x27 - (001)2 = 0x26. If you were to solder A0 and A1 then the address becomes 0x24 because 0x27 - (A2 + A1 + A0) = 0x27 - (011)2 = 0x24.

For using with an Arduino, we"ll need the LiquidCrystal_I2C library. Here"s an example sketch which is found in File -> Examples -> LiquidCrystal_I2C -> HelloWorld:

The first parameter is the I2C address, the second is the number of columns and the last number is the number of rows. The library can be used with other LCD sizes as long as the controller is HD44870.

So far I"m really liking this I2C LCD backpack as it reduces the number of wires I have to use. If you"re also having problem with the pin count of a common parallel LCD, then you should try this one.

LiquidCrystalIO is a fork of the LiquidCrystal library for HD44780 devices that works on both Arduino and mbed devices, integrating with IoAbstraction library. Further, it also works either with device pins or any IO expansion device supported by IoAbstraction, including direct pins, PCF8574, PCF8575, MCP23017 and shift registers. Importantly, HD44780 displays are slow, very slow in fact, running at around 270Khz. This means that there are inevitable delays involved in programming the device, in this fork those delays give some time back to task manager so that other tasks can run while waiting. The only limitation this brings is that only one task manager task must draw to the display, otherwise the code would re-enter heavily affecting the delays.

During construction there is an additional parameter; which is of type IoAbstractionRef, this represents the means of communication with the device. Out of the box it supports device pins, shift registers, and PCF8547 / MCP23017 I2C IO expanders.

DfRobot provides the simplest way to get started with LiquidCrystalIO on Uno and Mega (and other compatible boards). It has a display with an array of switches connected to A0 (up, down, left, right and select). This library works correctly with the display and even has a shorthand way of creating the LCD for this case.

Connections to an Arduino Uno, Mega This board is for use with Arduino Uno and Mega devices, because they are compatible with the original wiring pin out spec.

An I2C LCD backpack based on the PCF8574 chip provides an easy way to get started with LiquidCrystalIO on most Arduino boards. It is usually in one of two configurations as listed below. This library works correctly with the display and even has a shorthand way of creating the LCD for this case.

Connectivity combinations for i2c backpacks Pin Option1 Option2 0 RS EN 1 RW RW 2 EN RS 3 Backlight Backlight 4 D4 D4 5 D5 D5 6 D6 D6 7 D7 D7 Construction for Option 1 outside of any functions (global):

You can connect up a device using just about any arrangement of pins or expander, at the end of the day any device supported by IoAbstraction, including MultiIo (pins and IoExpander mix) can be used here.

LiquidCrystalIO is now also compatible with mbed boards. It supports regular mbed pins, I2C backpacks based on PCF8574 and MCP23017 based connections. You can adapt any of the Arduino examples for mbed very easily, as the API is 99% the same.

Arduino - LCD - I2C - LM1602 module, based on PCF8574 chip, allows to connect a popular 2x16, 4x20 or 2x8 LCD display to any microcontroller via I2C bus. Thanks to such a connection, instead of 6 lines (D4, D5, D6, D7, E, RS), we will use only two. This will save valuable Arduino Uno outputs. We also don"t have to connect a contrast adjustment potentiometer, because it is already on the board. LM1602 gives us control over display backlighting - we can turn it on and off at any time using appropriate library function (LiquidCrystal I2C).

We can download the aforementioned library from the service: https://bitbucket.org/fmalpartida. Downloaded file should be unpacked, and then the whole LiquidCrystal folder should be placed in Arduinolibraries folder(libraries), which is located in Documentsfolder by default (the default path in Windows 7 is:C:/Users/user_name/Documents/Arduino/libraries).

Downloaded library has the same name as standard one, built in Arduino. Therefore, after installing it in Arduino environment only the new one will be visible. To return to the default version, you need a new LiquidCrystal folder from the Documents/Arduino/libraries directory .

This type of LCD display is very widespread in Arduino projects but unfortunately consumes a lot of Inputs/Outputs, hence the interest of an I2C backpack allowing to reduce four-wire connections (SDA and SCL, ground and power supply) between Arduino and I2C display. It is also well known that the fewer the wires, the easier the connection.

The I2C interface on the back uses a 2.54mm impaction, which allows the use dupont connectors to make connections on breadboard (or directly on an Arduino).

The advantage of an I2C bus is that it allows you to connect several peripherals on the same bus ... as long as each peripheral has a unique address on the bus.

This display has jumpers for configuring its address on the bus between 0x20 and 0x27. A potentiometer on the back allows you to adjust the contrast of the display.

One of the most widely used information display elements in the Arduino world is the 16×2 LCD (Liquid Crystal Display). When manufacturing an electronic system, it can be interesting to have it give us some information about its status without having to connect it to a computer or to another system such as a smartphone. The 16×02 LCD screen is supplied with a large number of Arduino kits and is very sufficient for a large number of applications.

The 16×2 LCD screen can be found mounted on a shield with the bonus of a few buttons to create simple programmable interfaces to display values and control your Arduino project. All this while making the installation much easier.

Liquid crystal displays make use of the light modulation property of liquid crystals. Liquid crystal displays consist of two layers of polarizers, with perpendicular polarization directions, sandwiching two glass plates between which the liquid crystals are placed. On the glass plates is a matrix of electrodes for each pixel. A voltage applied between the electrodes of a pixel causes a change in the orientation of the molecules and thus the transparency of the pixel, which may or may not allow the light of the backlight to pass through.

Once your module is correctly connected, you can modify the following code to obtain the desired functionality. In the following example, we define a function that will read the value of the buttons and execute an action according to the button pressed.

For each button pressed, the name and value of the button are displayed. Your shield may be different depending on the supplier and version. If this is the case, this code will allow you to easily modify the button detection values.

In this project, we learn to make a DIY Turbidity Meter by interfacing DfRobot Turbidity Sensor with Arduino. Turbidity is the measure of relative clarity of a liquid. It is an optical characteristic of water and is a measurement of the amount of light that is scattered by material in the water when a light is shined through the water sample.

Arduino Turbidity Sensor is applied in projects involving the monitoring of water turbidity in rivers, streams, lakes, water bodies, catchment and research sites, laboratories, tanks with liquids, and so on. Thus by interfacing this sensor with Arduino, we can make a Water Quality Monitoring System device. The water quality measurement also includes some other sensors like Ph Sensor for measuring the Ph value of Liquid, also the TDS Sensor for measuring total dissolved solute in water & DO Sensor to measure dissolved oxygen in water.

We have already discussed Ph Sensor and TDS Sensor earlier. In this entire article, we will cover the basics of Turbidity Sensor and its practical demonstration in measuring Water Turbidity for Water Quality Monitoring. The Turbidity value is measured in terms of NTU which is called Nephelometric Turbidity Units. We will display the Arduino Turbidity Sensor value in the 16X2 LCD Display.

The following are the components required for making this project. All the components can be easily purchased from Amazon. The component purchase link is given as well.

Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in the air. The measurement of turbidity is a key test of water quality.

Turbidity is caused by particles suspended or dissolved in water that scatter light making the water appear cloudy or murky. Particulate matter can include sediment, especially clay and silt, fine organic and inorganic matter, soluble colored organic compounds, algae, and other microscopic organisms.

High turbidity can significantly reduce the aesthetic quality of lakes and streams. It can increase the cost of water treatment for drinking and food processing. It can harm fish and other aquatic life by reducing food supplies, degrading spawning beds, and affecting gill function.

Sediment often tops the list of substances or pollutants causing turbidity. Natural sources can include erosion from upland, riparian, stream bank, and stream channel areas. Algae that grow with nourishment from nutrients entering the stream through leaf decomposition or other naturally occurring decomposition processes can also be a source of turbidity.

Stream channel movement can also release sediment. Organic matter from sewage discharges, especially during treatment plant bypasses, can contribute to turbidity. Human activities that disturb the land, such as construction, mining, and agriculture, can lead to high sediment levels entering water bodies during rainstorms due to stormwater runoff.

Turbidity is measured using specialized optical equipment in a laboratory or in the field. Light is directed through a water sample, and the amount of light scattered is measured.

The unit of measurement is called a Nephelometric Turbidity Unit (NTU), which comes in several variations. The greater the scattering of light, the higher the turbidity. Low turbidity values indicate high water clarity; high values indicate low water clarity.

The gravity Arduino Turbidity sensor from DfRobot detects water quality by measuring the levels of turbidity. It uses light to detect suspended particles in water by measuring the light transmittance and scattering rate, which changes with the amount of total suspended solids (TSS) in water. As the TTS increases, the liquid turbidity level increases.

This liquid sensor provides analog and digital signal output modes. The threshold is adjustable when in digital signal mode. You can select the mode according to your Microcontroller Applications.

The sensor operates on the principle that when the light is passed through a sample of water, the amount of light transmitted through the sample is dependent on the amount of soil in the water. As the soil level increases, the amount of transmitted light decreases. The turbidity sensor measures the amount of transmitted light to determine the turbidity of the wash water.

The front-end sensor is an optical device comprising an LED (light sender) and a phototransistor (light receiver). The schematic of the Turbidity Sensor’s inside board is given below. It has a three-wire interface: VCC (+5 V), GND (0 V) & OUT/SIGNAL.

The LMV358 IC-based module provides a three-pin interface to connect with Arduino, and there is also an analog/digital selector switch on the module to flip between analog and digital output mode.

From this graph I concluded, while coding for your microcontroller-based project that the equation included in the relationship graph is only applicable if the sensor gives out 4.2 V roughly at zero turbidity (clear water), and it’s only true within the range of 2.5 V to 4.2 V (3,000 to 0 turbidity).

Thus if you are not getting the correct value, calibration is required. This can be done by rotating the small potentiometer inside the turbidity sensor.

Here is a basic code for Interfacing Turbidity Sensor with Arduino. This code will read the analog value from the sensor and display it on the Serial Monitor.

Now let us check the Turbidity sensor Arduino Project code. You need to add the I2C LCD Library to the Arduino IDE. Download the library from this link.

The output analog voltage from the sensor has huge variations and its too noisy to measure. Hence we took the 800 readings and then took the average value for reading.

To check the working of the project, you can dip the sensor in different types of water sources. You can mix mud, or clay and check the water Turbidity in NTU.

For example in clean water, the voltage will remain 4.2V. If it’s not showing 4.2 then you need to adjust the calibration by rotating the Potentiometer in Sensor.