Iot

ESP 8266 with NodeMCU What is a NodeMCU NodeMCU is an open-source development board designed specifically for the Internet of Things (IoT). Key features of the NodeMCU Integrated Wi-Fi chip ((802.11 b/g/n) operating at 2.4GHz SOC: Powered by a 32-bit Tensilica Xtensa LX106 CPU, usually clocked at 80 MHz (which can be overclocked to 160 MHz). For comparison, a standard Arduino Uno runs at just 16 MHz. Also comes with a flash memory of a 4 MB of storage. Power: MicroUSB port (for data and power) + VIN pin (4.5V to 9V). IO GPIO Pins: It features 17 General Purpose Input/Output pins, though some are reserved for internal flash communication. Peripheral Support: It natively supports standard communication protocols like I2C (for displays and advanced sensors), SPI (for SD cards or RFID readers), and UART (for hardware serial communication). PWM Support: Pulse Width Modulation is available on the digital pins, allowing users to dim LEDs or control servo motors. ADC (Analog-to-Digital Converter): It features one analog input pin (A0), which is perfect for reading analog components like potentiometers, light-dependent resistors (LDRs), or soil moisture sensors. ...

IOT Professional elective IOT: A dynamic globan network infrastructure with a self-configuring capability based on standard protocols and inter operatble communication protocols where physical and virtual things have identities, physical attributes, and virtual personalities use intelligent interfaces and are seamlessly integrated into the information network often communicate data associated with users and external environment. Charecteristics Dynamic and self-configuring Self configuring Interopeable communications protocols Unique identity Integrated info network Block diagram of an iot device ...

Raspberry Pi The raspberry pi is a series of small single-board computers developed in the United Kingdom by the Raspberry Pi Foundation to promote teaching of basic computer science in schools and in developing countries. Setting up Raspberry Pi As standard the Raspberry Pi comes without an operating system. It depends on the user which operating system is installed within the computer. The operating system can be installed on the Raspberry Pi using the following steps: ...

Motor Encoder Components Arduino Uno 4x4 Keypad I2C LCD DC Motor with encoder L293D Motor Driver Connections Display connections From (I2C display) To (arduino) 1 VCC 5V 2 GND GND 3 SDA SDA 4 SCL SCL Keypad connections From (Keypad) To (arduino) 1 Row 1 D13 2 Row 2 D12 3 Row 3 D11 4 Row 4 D10 5 Col 1 D9 6 Col 2 D8 7 Col 3 D7 8 Col 4 D4 Motor connections From (Motor) To 1 Motor negative Output 4 (L293D) 2 Motor positive Output 3 (L293D) 3 Encoder ground GND (L293D) 4 Channel B D3 (arduino) 5 Channel A D2 (arduino) 6 Encoder power 5V (arduino) L293D connections From (L293D) To (arduino) 1 Power 1 5V 2 Input 4 D5 3 Output 4 refer above 4 Ground GND (both arduino/motor) 5 Ground GND (both arduino/motor) 6 Output 3 refer above 7 Input 3 D6 8 Enable 3,4 5V 9 Enable 1,2 5V 10 Input 1 N/A 11 Output 1 N/A 12 Ground GND 13 Ground GND 14 Output 2 N/A 15 Input 2 N/A 16 Power 2 5V Code 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 // ---------- // keypad setup #include <Keypad.h> const byte numRows= 4; //number of rows on the keypad const byte numCols= 4; //number of columns on the keypad // global keypad variables String enteredValue = ""; int encoderSpeed = 0; float debugEncoderSpeed = 0.00; // (encoderSpeed * 100) / 255 //keymap defines the key pressed according to the row and columns just as appears on the keypad char keymap[numRows][numCols]= { {'1', '2', '3', 'A'}, {'4', '5', '6', 'B'}, {'7', '8', '9', 'C'}, {'*', '0', '#', 'D'} }; //Code that shows the the keypad connections to the arduino terminals byte rowPins[numRows] = {13,12,11,10}; //Rows 0 to 3 byte colPins[numCols]= {9,8,7,4}; //Columns 0 to 3 Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols); // ---------- // lcd setup #include <Adafruit_LiquidCrystal.h> Adafruit_LiquidCrystal lcd_1(0); int LCDRow = 0; #define motorA 5 #define motorB 6 int encoderPin1 = 2; int encoderPin2 = 3; volatile int lastEncoded = 0; volatile long encoderValue = 0; volatile long correctEncoderValue =0; long lastencoderValue = 0; int lastMSB = 0; int lastLSB = 0; void setup() { Serial.begin (9600); pinMode(encoderPin1, INPUT); pinMode(encoderPin2, INPUT); digitalWrite(encoderPin1, HIGH); //turn pullup resistor on digitalWrite(encoderPin2, HIGH); //turn pullup resistor on attachInterrupt(0, updateEncoder, CHANGE); attachInterrupt(1, updateEncoder, CHANGE); pinMode(motorA,OUTPUT); pinMode(motorB,OUTPUT); lcd_1.begin(16, 2); lcd_1.print("Enter value:"); lcd_1.setCursor(LCDRow, 10); } void loop() { // encoder control statements correctEncoderValue = encoderValue/4; Serial.println(correctEncoderValue); if ( 0<=correctEncoderValue && correctEncoderValue < 3000) { analogWrite(motorA,encoderSpeed); digitalWrite(motorB,LOW); } else { analogWrite(motorA,0); digitalWrite(motorB,LOW); } delay(100); // keypad control statements char keypressed = myKeypad.getKey(); if (keypressed != NO_KEY) { Serial.println(keypressed); } // getting the key pressed from the user if (keypressed){ // gets triggered for numeric key presses if (keypressed != 'D' && keypressed != 'A' && keypressed != 'B' && keypressed != 'C') { Serial.println(keypressed); lcd_1.print(keypressed); lcd_1.setCursor(++LCDRow, 10); enteredValue += keypressed; // a - clear the entered value } else if (keypressed == 'A') { lcd_1.clear(); lcd_1.print("Enter value:"); lcd_1.setCursor(++LCDRow, 10); enteredValue = ""; encoderSpeed = 0; // d - update the entered value } else { LCDRow = 0; lcd_1.clear(); lcd_1.print("Value updated"); delay(500); // taking the encoder speed from the user // encoder value lies between 0 and 255 // we take the value only if its between 0 and 255 if (enteredValue == "") { encoderSpeed = 0; Serial.println("Case 1: Blank entered value"); } else if (enteredValue.toInt() > 0 && enteredValue.toInt() < 255) { encoderSpeed = enteredValue.toInt(); Serial.println("Case 2: Accepted entered value"); } else { encoderSpeed = 0; Serial.println("Case 3: Out of of bounds entered value"); } } // special keypresses end } // keypressed trigger end debugEncoderSpeed = (encoderSpeed * 100) / 255; Serial.println(debugEncoderSpeed); } void updateEncoder(){ int MSB = digitalRead(encoderPin1); //MSB = most significant bit int LSB = digitalRead(encoderPin2); //LSB = least significant bit int encoded = (MSB << 1) |LSB; //converting the 2 pin value to single number int sum = (lastEncoded << 2) | encoded; //adding it to the previous encoded value if(sum == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) encoderValue ++; if(sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) encoderValue --; lastEncoded = encoded; //store this value for next time } How to use this Click the link below and press simulate. You can see the debug output in the serial monitor. To enter a value press a key on the keypad. To update the value press D and to clear the value press A. ...

ARM Basics Advanced RISC Machine (ARM) is a family of reduced instruction set computing (RISC) architectures for computer processors, configured for various environments. Arm Holdings develops the architecture and licenses it to other companies, who design their own products that implement one of those architectures‍—‌including systems-on-chips (SoC) and systems-on-modules (SoM) that incorporate memory, interfaces, radios, etc. It also designs cores that implement this instruction set and licenses these designs to a number of companies that incorporate those core designs into their own products. Running ARM IC within simulator Download and install Keil uVision - MDK ARM Go to project in the menu bar anc click on new uVision Project. Select lpc2148 in the menu and click it. Disable startup file. Save the project in a new folder named something. This folder name can be changed accordingly but all the dependency file should correspnd to it. Within this folder create a newfile called as something.s. Copy and paste this code in something.s 1 2 3 4 5 6 7 8 AREA ONE, CODE, READONLY ENTRY MOV R0, #0X01 MOV R1, #0X02 ADD R2, R1, R0 L B L END Click one the source group on the left hand side and right click to add existing files… Add the something.s file, by checking the assembly files option Click translate first on the menu bar and then click build the second time. Now in the menu bar click on debug and then click start/stop debug session You can click run to run everything or click on step to run one line at a time More info about the lpc2148 The microcontroller lpc 2148 is a 32 bit memory controller. ...