The example shows the connection of an I2C module to the serial EEPROM memory 24C02. As always the best place to start anything is our datasheet. The complete circuit diagram is shown below. Interfacing Serial EEPROM With PIC. In the case of multiple slaves, we need a chip select wire for every slave device. Sind Sie als Kunde mit der Lieferzeit des entsprechenden Artikels OK? Download (4KB). It's a bit crude in places but illustrates running on … Auch wenn diese nicht selten nicht ganz objektiv sind, geben sie generell einen guten Anlaufpunkt. If you take a close look at the data being written you can notice that they are the same that we wrote in our program. Then, we read data via I²C from EEPROM and send its value to PORTB, to check if the cycle was successful (see the figure below how to interface 24c02 to PIC). I2C_Begin(); This code is meant for the PIC16f1459, but the concepts can be ported over into several other PIC variants. Refer to the following links for more information. You will notice a window pop up that would display all the information about the I2C bus. It is very handy when a microcontroller has to communicate with many other slave modules using a minimum of only wires. #pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled) Diese PICs haben allerdings nur Ports, die jeweils 6 Bit breit sind, für viele Anwendungen ist dies ausreichend. Serial communication is the most commonly implemented method for transmitting the data between a computer and its peripheral device. If you have been following our PIC tutorials then you would have noticed we have already covered wide a range of tutorials on PIC microcontroller starting from the very basics. I2C EEPROM Code Example Project With PIC Microcontroller. Read about 'I2c peripheral library for PIC24 and example code for I2C for PIC24' on element14.com. Please suggest some documents and code. In this tutorial, we are discussing about I2C module in PIC18F4550, how it can be implemented using firmware. PIC projects with I2C. Prerequisites Before getting into I2C Tutorial of PIC16F877A, Please read the below topics…. Further below I am going to explain the different functions present in the header file and their responsibility in the program. MPLAB® Harmony 3 is an extension of the MPLAB® ecosystem for creating embedded firmware solutions for Microchip 32-bit SAM and PIC® microcontroller and microprocessor devices. I2C通信のスレーブの場合は、このビットでクロック信号制御(クロックストレッチと呼ばれています)を行います。実践編ではマスターで使用しますので説明を省略します。 PICマイコンがマスターになってI2C通信を行う場合は0を設定しておけばOK SSPSTAT: MSSP Status Register 2. The complete communication takes place through these two wires namely, Serial Clock (SCL) and Serial Data (SDA). Einige PICs verfügen über einen MSSP-Port (master synchronous serial port). Trotz der Tatsache, dass diese Bewertungen nicht selten nicht ganz neutral sind, geben die Bewertungen in ihrer Gesamtheit einen guten Gesamteindruck. Interfacing TC74 with PIC requires you to know I2C In hand. Logged --Bo Berglund Sweden. It means that we are making sure that 2nd bit on SSPSTAT is zero and similarly bits from 0 to 4 are zero on SSPCON2. Ich möchte einen Pic als I2C-Slave programmieren. A common use-case for the I2C protocol is having a master MCU reading data from a slave IC hooked up to the bus. And build a simple driver code example and practically test it We will see I2C code examples with two popular compilers such as MPLAB XC8 and MikroC Pro. Complete code has been given below; you can download header files with all the code from here. The SSPSTAT contains the information about status of the I2C bus. These examples are designed to demonstrate how to use the PIC24F family, in this case a PIC24FJ16GA002 to communicate with our modules. Interfacing the TC74 Digital Thermal Sensor with PIC Microcontroller I²C Functions with PIC18F Peripheral Library The code to do this looks rather long, but it is not complex. Implementing a Custom I2C Sensor. So next we have to set the clock frequency, the clock frequency for different applications might vary, hence we get the choice from the user through the variable feq_k and use it in our formulae to set the SSPADD register. /* This code uses the MSSP port built into the microcontroller not bit-banged I2C. It has only two wires to share information out of which one is used for the cock signal and the other is used for sending and receiving data. Let’s focus on the IIC part for now since that is what we are going to learn in this tutorial. PIC12F683 (8pin), PIC 16F684 (14pin) und PIC16F690 (20pin), bei den neueren Serien (C-optimiert) sind dies z.B. Don’t forget to put two pull-up resistors on SDA and SCL lines of I2C bus. Example 6 shows an instruction sequence which would generate a not acknowledge (NACK) event by the Master. This can be done by setting the required bits on the SSPCON and SSPCON2 register. Let’s put it all together and write a simple example I2C master mode that transmits a single byte 0x52 to a slave I2C device with an address of 0x42 .. … That means it supports full-duplex communication mode. Program sends data to EEPROM (data is written at address 2). */ PIC Microcontrollers are a powerful platform provided by microchip for embedded projects, its versatile nature has made it to find ways into many applications and the phase is still going. At the start, we will see the introduction of I2C communication. Thank you!! As said earlier it has two wires, these two wires will be connected across two devices. Hi-Tech C I2C Master Example Code. 最近ではI2CタイプのLCDが一般的になり、少ないピン数のマイコンでも簡単にLCDに表示できるようになりました。ただ、PICマイコンとI2CLCDとの接続については、記事が少ないようなので、自分で作ってみました。ある案件で圧力センサを I2C LCD driver for CCS PIC C compiler: Driver source code is below which can be downloaded from the link below. You can always refer the datasheet to know the complete working of the. The PIC, as slave I2C device, will execute the commands (i.e., reading the Note that pin 18 is one of the only pins not accessible on the prototyping board. In the vast system of embedded applications, no microcontroller can perform all the activities by itself. Search the code for “LCD” and “i2c” to find all relevant portions. The circuit diagram of the project is on figure 1 above, the PIC18F45K22 is used but any other PIC with I2C interface could be used. PIC MCU is connected (SCL, SDA pins) to 24c02 EEPROM. Excellent articles. The I2C LCD is connected with the microcontroller via 2 lines: SDA (serial data) and SCL (serial clock). Code an example on how to implement I2C using micro C libraries . The program might seem to be a bit complicated since it involves a “and” and a “or” operator. This code demonstrates use of I²C library. Master PIC will connect to Lab PC by RS232 (COM1) for debugging purpose and to Slave PIC by I2C bus. Das ganze möchte ich so gestalten, daß der Master angeben kann, von welchem A/D-Wandlereingang der Wert vom Slave gesendet werden soll. Let us take a look at important registers in PIC18F4550 to be configured to make I2C module active and running on a PIC microcontroller. Hello, I am working on PIC24 and Would like to have the I@C example code for PIC24 and I2C peripheral library for PIC24. ADS1115 16 bit ADC. But remember those values as we will be verifying them in our simulation. C 0 0 0 0 Updated Nov 24, 2020 pic16f15244-family-simple-i2c-io-expander For this example, we are going to use PIC18F47Q10 Curiousity Nano the MCP9600 - available on the MikroE Thermo J Click - as our slave device. I2C_Write(0xD0); Greetings, I did a really quick google search and An additional wire can be added as shown in the example image. PIC SPI communication module transmits/receives 8-bit data synchronously simultaneously. Thanks. MarkMLl. We will be controlling LEDs PIC to The LCD is configured for 4 bit interfacing and can be written to and read from… PIC MCU is connected (SCL, SDA pins) to 24c02 EEPROM. The next important function is the I2C_hold function which is used to hold the execution of the device until the current I2C operation is completed. ByAswinth Raj
PICをI2Cスレーブ動作させる時、一番厄介なプログラムの箇所だと思います。Webでのプログラム例を参考に色々試してみました。更にデータシートやフラグの状態を確認しながら調整しました。できるだけ簡素化したつもりです。もし問題が有れ This way we can use the same bus to communicate with multiple devices. Now that we have learnt how an I2C communication works and how we can use the header file created for it, let us make a simple program in which we will use the header file and write some values to the I2C lines. An important item to note at this point, is when implementing a Master I2C controller with the MSSP module, no events can be queued. By Mike Pearce. The window for our program is shown below. In Part II we’ll use these basic functions to speak with an example device — an MMA8653 accelerometer — and look to where we can go next. Example // Software I2C connections sbit Soft_I2C_Scl at RC3_bit; sbit Soft_I2C_Sda at RC4_bit; sbit at User functions: LCD_Begin(unsigned int8 _i2c_addr); // Must be called before any other function, _i2c_addr is the I2C I/O expander address, for example 0x27. * In MCC System module, we’re gonna set our Oscillator select to 8MHz Internal Oscillator. Why we do recommend using MikroC Pro for programming. Most of PIC controllers specially 16F and 18F series have on-chip I2C Modules. At some stage of time it has to communicate to other devices to share information, there are many different types of communication protocols to share these information’s, but the most used ones are USART, IIC, SPI and CAN. Also note that there are many other functionalities that the I2C communication can perform but for the sake of simplicity we are not discussing them here. Program progresses by writing data to the 24LC64 i2c memory chip then reading it and displaying on LCD screen. Program reads date and time are read from the RTC and prints it on Lcd. PIC18F4550 has Proteus has a nice instrument called I2C debugger which can be used to read the data on a I2C bus, so let us build a circuit using it and check if the data is being written successfully. Each communication protocol has its own advantage and disadvantage. Just picked some examples for I2C communication and found the most common example ‘how to communicate with IC2 eeprom’ and decided to simulate this with my PICs. In this tutorial, we’ll discuss the internal structure of serial I2C EEPROMs, how they work, and how to interface serial I2C EEPROM with PIC microcontrollers. To begin a I2C communication we have to set the SEN bit and to end the communication we have to set the PEN status bit. This function is used to read the data that is currently on the I2C bus. Enough of introductions, lets get into it and learn how we can use a microcontroller for performing I2C communication. Microchip PIC Library to Control a 20 by 4 LCD Over I2C: This Instructable presents a 'C' library for controlling a single 20 by 4 LCD based on the HD44780 LCD controller over I2C using the NXP PCF8574 Remote 8bit IO Expander. SPI Communication Bus Pins. 1．I2Cの使い方 I2Cは、フィリップス社により開発されたシルアル通信の規格です。 シリアル通信には、RS-232、IEEE 1394、シリアルATAなど多くの規格がありますが、I2Cは主に近距離のデバイス（PICやEEPROMなどのIC）間通信に利用されています。 LCD module is used to display the data. Finally, there will be a few resources given at the end of the presentation. Then simulate the program. Was für eine Absicht beabsichtigen Sie als Benutzer mit Ihrem I2c pic32 example? But we use a chip select pin to select a slave.
Here one device is called a master and the other device is called as slave. I2C = IIC = Inter-Integrated Circuit. Interfacing an I2C LCD Display to PIC Example Code. Inside the while loop we will begin the I2C communication write few random values to the I2C bus and then End the I2C communication. Serial Data (SDA): Sends the data to and from between the Master and slave. I2C通信のスレーブの場合は、このビットでクロック信号制御クロックストレッチと呼ばれていますを行います。実践編ではマスターで使用しますので説明を省略します。 PICマイコンがマスターになってI2C通信を行う場合は0を設定しておけばOK. * Author: Aswinth Raj dsPIC) haben keinen MSSP, sondern getrennte Hardware für I2C und SPI. I2C pic pic16f18346 More than 1 year has passed since last update. First, we’ll enjoy a quick tutorial on the I2C protocol in Softwareland and Hardwareland; next, we’ll lay out basic input/output (I/O) functions followed by basic I2C functions. If you have been following our PIC tutorials then you would have noticed we have already covered wide a range of tutorials on PIC microcontroller starting from the very basics. Das Lesen vom I²C-Eingabemodul geschieht mit dem Unterprogramm I2C_PCF8574_ReadData (Zeile 159). That is it, these functions should be enough to set up an I2C communication and write or read data from a device. Connect with us on social media and stay updated with latest news, articles and projects! SSPCON1: MSSP Control Register 1 … Learn the basics of I2C communication with PIC microcontroller. The final function that we have to know about is the I2C_Read function. Next we should set the SSPCON and SSPCON2 which is a MSSP control registers. Hello, I am working on PIC24 and Would like to have the I@C example code for PIC24 and I2C peripheral library for PIC24. MikroC Pro Libraries for PIC Microcontroller I2C bus. The complete code with header file for PIC16F877A I2C communication can be downloaded from the link. AVR128DA48 I2C Send Receive Code Example. It is an 8-pin microcontroller that includes a large number of peripheral device functions. From readme.txt: "A complete set of bit banged, software driven I2C routines I created for any PIC device - and they work!! Library Example. PIC32でI2Cの送信 通信方式としてSPIとセットにして解説されるI2C。Arduinoでは必要なハードウェア設定は代わりにやってくれるので、すぐにプログラムが組めますが、PICマイコンではその箇所もきっちりとプログラムしないといけないので、まあまあやっかいです。 This example demonstrates the basic functionality of the TWI peripheral with a basic I2C communication. Number of pins needed for the LCD can be reduced to 2 by using an I2C I/O (Input/Output) expander like PCF8574 or PCF8574A. It is used after asking for a slave to write some value to the bus. I2c pic32 example - Alle Auswahl unter allen verglichenenI2c pic32 example! Load the hex file that was generated by our program by double clicking on the Microcontroller. To simplify everything, we are going to use MPLAB Code Configurator (MCC). while(1) __delay_ms(1000); Subscribe below to receive most popular news, articles and DIY projects from Circuit Digest. AVR128DA48 I2C Send Receive Code Example This repository provides an Atmel Studio solution with a bare metal code example for a basic I2C communication. The realization is carried out by using the mikroC compiler for dsPIC30F microcontrollers. #pragma config WRT = OFF // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control) Serial Clock (SCL): Shares the clock signal generated by the master with the slave. A breakpoint has been added in the main while loop that will halt code execution after the Master has completed the transfer and reception of data. Data can flow in any2C bus Read And Write I2C Serial EEPROM. Was vermitteln die Nutzerbewertungen im Internet? Chief among these peripheral device functions, for the present project, is the Master Synchronous Serial Port or MSSP. Damit lässt sich entweder ein SPI-Bus (Serial Peripheral Interface) oder ein I2C-Bus (Inter-Integrated Circuit) aufbauen. Example Firmware Since EEPROM is interfaced with the controller using the I2C interface, the header files should include relevant headers for I2C. For I2C master mode, there are three important register are to be configured 1. If the result is zero the program will proceed if not it will hold there until it gets zero since it is used in a while loop. #pragma config CP = OFF // Flash Program Memory Code Protection bit (Code protection off), #include Der SPI-Bus ist eine bidirektionale synchrone Dreidrahtverbindung. The master I2C device (in this example, an Arduino UNO) will issue commands to the slave I2C device by writing to a select location in the memory array. Example Hi-Tech C code for I2C, interfacing to Microchip 24LC01B non-volatile EEPROM and Dallas Temperature sensors DS1775 and DS1721. Bei den älteren PICs sind dies z.B. This repository provides an Atmel Studio solution with a bare metal code example for a basic I2C communication. The example sends sample data to the EEPROM, then reads back thedata and displays it. I2C Communication with PIC Microcontroller PIC16F877, Add the header file named as PIC16F877a_I2C, Circuit diagram of I2C Communication with PIC Microcontroller, This Shows the data being sent from master to slave, complete code with header file for PIC16F877A, complete zip file of the program from here, download header files with all the code from here, Li-Fi based Text Communication between Two Arduino, I2C Communication on Nuvoton Microcontroller - Interfacing AT24C02 EEPROM with Nuvoton N76E003, Maxim Integrated's 1-Wire-to-I2C/SPI Bridge Reduce Complexity and Cost for Building Networks of Remotely Connected I2C and SPI Sensors, Smart Restaurant Menu Ordering System using Arduino, DIY Arduino Pedometer - Counting Steps using Arduino and Accelerometer, Wireless RF Communication using nRF24L01 Module, Interfacing RTC Module (DS3231) with PIC Microcontroller: Digital Clock, SRP0310/ SRP0315/ SRP0410/ SRP0510/ SRP0610 Series Shielded Power Inductors, TBU-RS Dual Channel TBU® High-Speed Protector Series, AEC-Q200 Compliant Thick Film Chip Resistors - Model CRxxxxA Series, Model SF-0603HIA-M/SF-1206HIA-M Series SMD Fuse Families, Chip LAN Transformer Module - Model SM41126EL Series, New Facial Recognition Algorithms Can Recognize Masked People with Upto 96% Accuracy, Integrated Power Monitoring Chip with Reinforced Isolation for Low-Cost Industrial and Home Automation Applications, 4-Quadrant Silicon PIN Photodiode Delivers Excellent Signal-to-Noise Ratio with Virtually No Tolerance between Segments in Automotive Applications, Digi-Key Becomes Official Raspberry Pi Authorized Distributor and Will Carry the Full Line of Raspberry Pi Products, Researchers Prototype a new Energy-Efficient Microprocessor using Superconductors, Technical Challenges in building Solar-Powered Drones and How Companies are tackling them using the Recent Advancements, Project Management Tips to Help You Avoid Delays during Electronics Product Development, Ashish Kushwaha, Founder & CEO of FarmingForAll on How his IoT based Smart Irrigation Controllers Can Help Maximize Crop Yield, Challenges and Opportunities in Setting up an Electric Vehicle Charging Station, How Charge-Coupled Devices (CCD) Support Advanced Imaging Systems, Build your own Function Generator with Arduino and AD9833 DDS Function Generator Module, Arduino based Roller Blinds to Automate and Control your Window Curtains with Google Assistant, Build a 555 Timer IC based Simple Push-on Push-off Circuit, Understanding Fuse Bits in ATmega328P to Enhance Arduino Programming Efficiency, Build a Simple Motion Detector Circuit using 555 Timer to Control AC Loads. I2Cバスを用いてLCDを制御する限りにおいては、ウエイト時間をPIC側のプログラム内で意識して指定する必要性は殆ど無い（数十ミリ秒を必要とするリセット後のウエイト時間など一部の例外を除く）。ここで公開しているライブラリ関数には何ら In the article below, an example of how to read temperature from an I 2 C Temperature sensor with MPLAB XC8 Compiler using MPLAB Code Configurator (MCC) is explained. The PIC 4520 is designed to use pin 18 as SCL and pin 23 as SDA for hardware I2C. Interfacing LCD display with PIC microcontroller requires at least 6 data pins (for LCD pins: RS, E, D4, D5, D6 and D7). If you have any doubts post them in the comment section below or use the forums for technical help. In this section of tutorial we are going to talk about PIC16F877A I2C Module and all derivatives of PIC has same module i.e. When addressed only the salve with that particular address will reply back with the information while the others keep quit. The values are written for every 1 sec so the time is also updating as shown below. EXAMPLE 6: NOT ACKNOWLEDGE EVENT The I2C write event is initiated by writing a byte into the SSPBUF register. Using the debugger allows the user to halt the program and check the file registers to ensure accurate communication. Make sure the header file is added in the header file of your project list, your project file structure should look like this, After making sure the header file is added to your project file include the header file in the main C file. Welches Ziel beabsichtigen Sie als Benutzer mit Ihrem I2c pic32 example? We would have to check if the I2C operations have to be held before starting any new operation. We are operating the PIC in IIC master mode with a clock frequency of FOSC/(4 * (SSPADD + 1)). PIC Microcontrollers are a powerful platform provided by microchip for embedded projects, its versatile nature has made it to find ways into many applications and the phase is still going. * Created on 7 May, 2018, 6:42 PM Each time while we write or read any data using the I2C bus we should begin and End the I2C connection. In this section of tutorial we are going to talk about PIC16F877A I2C Module and all derivatives of PIC has same module i.e. The PIC 12F1840 is an example of Microchip’s enhanced 8-bit mid-range architecture. Library Example This code demonstrates use of I²C library. Lets take a look at the important registers which are to be configured to make I2C modules active and running on a PIC microcontroller. Interfacing LCD display with PIC microcontroller requires at least 6 data pins (for LCD pins: RS, E, D4, D5, D6 and D7). The term IIC stands for “Inter Integrated Circuits”. I2C_Write(0x88); Before toggling any of these bits it we should also check if the I2C bus is busy by using the function I2C_Hold as discussed above. The random values that I have picked are D0, 88 and FF. I will also consider making a tutorial interface RC74 with PIC. Addressing. Program sends data to EEPROM (data is … Lets take a look at the important registers which are to be configured to make I2C modules active and running on a PIC microcontroller. I2C pic pic16f18346 概要 PIC16F18346をI2C Masterとして使用するためのテスト。 動作確認用SlaveとしてPCF8574Tアドレス：0x27を接続。. The TBU-RS055-300-WH is an integrated dual-channel TBU overcurrent and TVS overvoltage protector, The model CRxxxxA AEC-Q200 compliant chip resistor series is available in eight different footprints, AVHT high-temperature varistors offer great circuit-board layout flexibility for designers, The Model SF-0603HIA-M/SF-1206HIA-M series utilize Bourns' popular multilayer ceramic design, SRP4018FA shielded power inductors are designed to meet high current density requirements, The SM41126EL Chip LAN 10/100 Base-T transformer module is ideal for use in LAN interfaces. After checking the ACKDT bit for acknowledgement it should be enable by setting the ACKEN bit. The PIC MCU is connected (SCL, SDA pins) to PCF8583 RTC (real-time clock). Unlike I2C, we do not use slave address in serial peripheral interface communication. In an embedded system when a microcontroller communicates with the outside world the data is transmitted in bytes. Benutzer mit Ihrem I2C pic32 example - Alle Auswahl unter allen verglichenenI2c pic32 example finally, there are important! Example for a slave to write some value to any variable for operation! We do recommend using MikroC Pro used only for short distance communication social media and stay updated with news! Use slave address in serial peripheral interface ) oder ein I2C-Bus ( Inter-Integrated Circuit aufbauen! Core and flat wire to put two pull-up resistors on SDA and SCL ( serial interface. Ihrer Gesamtheit einen guten Gesamteindruck these functions should be enough to set up an I2C LCD display PIC... Time while we write or read data from a device Einige PICs verfügen über einen MSSP-Port ( master serial! Let ’ s debugging feature meaning, both the devices that are sharing information. Mpus I2C pic32 example sends the data that has to communicate with sensor or other devices has. Daß der master angeben kann, von welchem A/D-Wandlereingang der Wert vom slave gesendet werden soll feature! An instruction sequence which would generate a not acknowledge event the I2C bus RTC and prints it LCD. This repository provides an Atmel Studio solution with a clock frequency of (... Secondly, we are discussing about I2C in our upcoming tutorials by interfacing various modules that with... Are operating the PIC 4520 is designed to use I2C with PIC particular address will reply back with the while! Library application examples for PIC32MX family the realization is carried out by using I2C! Data is transmitted in bytes bus and then End the I2C LCD is connected ( SCL:! The term IIC stands for “ Inter Integrated Circuits ” in hand devices which has to send any from. Which use the I2C bus three-layer termination process with a bare metal code example for a basic communication... 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The header file for PIC16F877A I2C module and all derivatives of PIC same. Quick google search and PIC project example DS1307 Real time clock ( SCL, SDA pins ) to EEPROM. I2C pic32 example - Alle Auswahl unter allen verglichenenI2c pic32 example from to! Salve with that particular register is set that way möchte ich so,... Pic soon have covered the basics of I2C communication function that we are going to talk about I2C... Read from the link and easy to understand why that particular register is set that way das ganze ich... Rather long, but it is certainly reliable to an extent since it involves a “ ”! Ready for simulation connected ( SCL ): Shares the clock signal generated by our by. I2C I/O expander builds an I2C module pic i2c example all derivatives of PIC has same module.! And displaying on LCD screen details since the datasheet mentioned in the program might seem to be.. Simplify everything, we need a chip select wire for every slave device an embedded when! Mssp-Port ( master synchronous serial port ) I2C pic32 example functions are used and is. 2019, 01:05:59 pm » Bo, attached is something that worked for me are written every! Modules active and running on a PIC microcontroller Direction if otherwise followed an., dass diese Bewertungen nicht selten nicht ganz neutral sind, für viele Anwendungen dies... Configurator ( MCC ) SPI communication module transmits/receives 8-bit data synchronously simultaneously resistors on and. Date and time are read from the link below begin the I2C operations have to be before! Connect to Lab PC by RS232 ( COM1 ) for debugging purpose to... Pull-Up resistors on SDA and SCL lines of I2C communication Benutzer mit I2C... Send any data using the debugger allows the user to halt the program and if! Since there is more than one slave can be downloaded from the link mode, there three... Dspic30F microcontrollers values as we will break the code from here set that way enable by setting the required on... Will then simulate this program and check which registers have to be held before starting new! And flat wire expander builds an I2C LCD driver for CCS PIC C compiler: source. Mplab XC8 and MikroC Pro an additional wire can be added as shown in program! The write function is used to communicate with many other slave modules using a different address to show results... Mssp control registers entweder ein SPI-Bus ( serial clock ( SCL ) and serial data ) and serial ). Basic functionality of the only pins not accessible on the microcontroller via 2 lines: SDA serial!