ASAIR Temperature and Humidity Sensor AM2302 (Original) The AM2302 is a wired version of the DTH22, in a large plastic body. It is a basic, low-cost digital temperature and humidity sensor . It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and spits out a digital signal on the data pin (no analog input pins needed). It's fairly simple to use but requires careful timing to grab data. The only real downside of this sensor is you can only get new data from it once every 2 seconds, so when using our library, sensor readings can be up to 2 seconds old. Connect the red 3-5V power, the yellow wire to your data input pin, and the black wire to the ground. Although it uses a single wire to send data it is not Dallas One Wire compatible! If you want multiple sensors, each one must have its own data pin. Compared to DTH11, this sensor is more precise, more accurate, and works in a bigger range of temperature/humidity, but it's larger and more expensive. There is a 5.1K resistor inside the sensor connecting Vcc and DATA so you do not need additional pullup resistors. Also check the AM2302 Temperature & Humidity Sensor available on Iotcart. The sensor is suitable for 0-100 percent humidity readings with 2-5 percent accuracy and -40 to 80 degrees Celsius temperature readings with ± 0.5-degree Celsius accuracy. It has a sampling rate of no more than 0.5 Hz (once every 2 seconds) and comes in a 4-pin single-row pin package for easy connection.

AT24C256 I2C EEPROM Memory Module All pins leads out and be marked, the address input and the write-protect pin direct jumper settings on-board pull-up resistor for I2C communications required Onboard 8P-chip carrier, can support AT24C256 series chips Pin power supply, on-board power indicator

The Atmel® AVR® ATmega128 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the  ATmega128 achieves throughputs approaching 1MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. Peripheral Features Programmable I/O Lines 53 Programmable I/O Lines Timers Two 8-bit Timer/Counters and Two Expanded 16-bit Timer/Counters with Separate Prescalers and Compare Modes ADC 8-channel, 10-bit ADC Serial Interface 2 Programmable Serial USARTs Master / Slave Interface SPI Serial Interface PWM Two 8-bit PWM Channels and 6 PWM Channels with Programmable Resolution from 2 to 16 Bits Watch Dog Timer Programmable Watch Dog Timer With on chip Oscillator Power Supply Type DC Operating Voltage 2.7V - 5.5V Special Features Internal Oscillator Internal Calibrated Oscillator External Oscillator Up to 16 MHz Interrupt Source External and Internal Clock Frequency Setting Adjustable through Software

ATmega16 The ATmega ATmega16 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega16 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. Pinout: Pinout of ATmega16 1 PB0(XCK/T0) Pin 0 of  PORTB T0( Timer0 External Counter Input) XCK ( USART External Clock I/O) 2 PB1(T1) Pin 1 of  PORTB T1(Timer1 External Counter Input) 3 PB2(INT2/AIN0) Pin 2 of  PORTB AIN0(Internal Analog Comparator Positive Input) INT2( External Interrupt 2 Input) 4 PB3(OC0/AIN1) Pin 3 of  PORTB AIN1(Internal Analog Comparator Negative Input) OC0 (Timer0 Output Compare Match Output) or  PWM output 5 PB4(SS ) Pin 4 of  PORTB SS (SPI Slave Select Input).  This pin is low when controller acts as slave. [Serial Peripheral Interface (SPI) for programming] 6 PB5(MOSI) Pin 5 of  PORTB MOSI (Master Output Slave Input). When controller acts as slave, the data is received by this pin. [Serial Peripheral Interface (SPI) for programming] 7 PB6(MISO) Pin 6 of  PORTB MISO (Master Input Slave Output). When controller acts as slave, the data is sent to master through this pin. [Serial Peripheral Interface (SPI) for programming] 8 PB7(SCK) Pin 7 of  PORTB SCK (SPI Bus Serial Clock). This is the clock shared between this controller and other system for accurate data transfer. [Serial Peripheral Interface (SPI) for programming] 9 RESET Reset Pin (Active Low Reset) 10 VCC Connected to +5V 11 GND Connected to GROUND 12 XTAL2 Connected to Crystal Oscillator 13 XTAL1 Connected to Crystal Oscillator 14 PD0(RXD) Pin 0 of  PORTD RXD (USART Input Pin) [USART Serial Communication Interface can be used for programming] 15 PD1(TXD) Pin 1 of  PORTD TXD (USART Output Pin) [USART Serial Communication Interface can be used for programming] 16 PD2(INT0) Pin 2 of  PORTD External Interrupt INT0 17 PD3(INT1) Pin 3 of  PORTD External Interrupt INT1 18 PD4(OC1B) Pin 4 of  PORTD OC1B (Timer Output Compare Match Output) or  PWM output 19 PD5(OC1A) Pin 5 of  PORTD OC1A (Timer Output Compare Match Output) or  PWM output 20 PD6(ICP) Pin 6 of  PORTD Timer/Counter1 Input Capture Pin 21 PD7 (OC2) Pin 7 of  PORTD Timer/Counter2 Output Compare Match Output 22 PC0 (SCL) Pin 0 of  PORTC TWI Interface 23 PC1 (SDA) Pin 1 of  PORTC TWI Interface 24 PC2 (TCK) Pin 2 of  PORTC JTAG Interface 25 PC3 (TMS) Pin 3 of  PORTC JTAG Interface 26 PC4 (TDO) Pin 4 of  PORTC JTAG Interface 27 PC5 (TDI) Pin 5 of  PORTC JTAG Interface 28 PC6 (TOSC1) Pin 6 of  PORTC Timer Oscillator Pin 1 29 PC7 (TOSC2) Pin 7 of  PORTC Timer Oscillator Pin 2 30 AVcc Vcc for Internal ADC  Converter 31 GND GROUND 32 AREF Analog Reference Pin for ADC 33 PA7 (ADC7) Pin 7 of  PORTA ADC (Analog to Digital Converter) Channel 7 34 PA6 (ADC6) Pin 6 of  PORTA ADC (Analog to Digital Converter) Channel 6 35 PA5 (ADC5) Pin 5 of  PORTA ADC (Analog to Digital Converter) Channel 5 36 PA4 (ADC4) Pin 4 of  PORTA ADC (Analog to Digital Converter) Channel 4 37 PA3 (ADC3) Pin 3 of  PORTA ADC (Analog to Digital Converter) Channel 3 38 PA2 (ADC2) Pin 2 of  PORTA ADC (Analog to Digital Converter) Channel 2 39 PA1 (ADC1) Pin 1 of  PORTA ADC (Analog to Digital Converter) Channel 1 40 PA0 (ADC0) Pin 0 of  PORTA ADC (Analog to Digital Converter) Channel 0 Applications: Hobbyists applications Engineers design Temperature control systems Analog signal measuring and manipulations. Embedded systems like coffee machine, vending machine. Motor control systems. Digital signal processing. Peripheral Interface system.

ATmega162 The ATmega162 is a low-power CMOS 8-bit microcontroller based on the AVR-enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. The AVR core combines a rich instruction set with 32 general-purpose working registers. All 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers. In order to maximize performance and parallelism, the AVR uses a Harvard architecture – with separate memories and buses for program and data. While one instruction is being executed, the next instruction is pre-fetched from the program memory. Program flow is provided by conditional and unconditional jump and call instructions, able to directly address the whole address space. Most AVR instructions have a single 16-bit word format. Every program memory address contains a 16- or 32-bit instruction. Pinout: Pinout Of ATmega162 Applications: Industrial Automation Automotive Applications Medical Devices Consumer Electronics Internet of Things (IoT)

ATmega168 The Atmel ATmega168 is a low-power CMOS 8-bit microcontroller based on the AVR-enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega168 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. The AVR core combines a rich instruction set with 32 general-purpose working registers. All 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers. Pinout: Pinout of ATmega168 Applications: Multiple DIY projects. Projects requiring more than logical control for devices. Microcontroller applications for multiple device interface/Control.

The high-performance, low-power Atmel 8-bit AVR RISC-based microcontroller combines 32KB of programmable flash memory, 2KB SRAM, 1KB EEPROM, an 8-channel 10-bit A/D converter, and a JTAG interface for on-chip debugging. The device supports a throughput of 16 MIPS at 16 MHz and operates between 4.5-5.5 volts. By executing instructions in a single clock cycle, the device achieves throughputs approaching 1 MIPS per MHz, balancing power consumption and processing speed

ATmega328P-U PDIP-28 8 BIT Microcontroller IC The Atmel ATmega328 IC is a 32K 8-bit microcontroller based on the AVR architecture. Many instructions are executed in a single clock cycle providing a throughput of almost 20 MIPS at 20MHz. The ATMEGA328P-U comes in an PDIP 28 pin package and is suitable for use on our 28 pin AVR Development Board . The ATmega328P-U AVR is supported with a full suite of program and system development tools including C Compilers, Macro Assemblers, Program Debugger/Simulators, In-Circuit Emulators, and Evaluation Kits. Applications: Industrial control systems Switched-mode power supply (SMPS) and power regulation systems Digital data processing Analog signal measuring and manipulation Embedded systems like coffee machines, vending machines Motor control systems Display units Key Features: Additional Features Features Internal calibrated oscillator Power on reset and programmable brown out detection External and internal interrupts 6 sleep modes including idle, ADC noise reduction, power save, power down, standby, and extended standby I/O and Package 23 programmable I/O lines 28 pin PDIP package Speed Grades: 0-4 MHz at 1.8-5.5V 0-10 MHz at 2.7-5.5V 0-20 MHz at 4.5-5.5V Low power consumption mode at 1.8V, 1 MHz and 25°C: Active Mode: 0.3 mA Power-down Mode: 0.1 ?A Power-save Mode: 0.8 ?A (Including 32 kHz RTC) Pinout:

ATmega8 The ATmega8A IC is a low-power CMOS 8-bit microcontroller based on the AVR RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega8A achieves throughputs approaching 1 MIPS per MHz, allowing the system designer to optimize power consumption versus processing speed. The ATmega has 16 KB programmable flash memory, static RAM of 1 KB and EEPROM of 512 Bytes. The endurance cycle of flash memory and EEPROM is 10,000 and 100,000, respectively. Pinout: Pinout of ATmega8A Applications: Home automation Industrial automation Robotics Automotive Medical devices Communication devices Also check ATmega32 , a high-performance, low-power 8-bit AVR RISC-based microcontroller by Atmel. It features 32KB of programmable flash memory, 2KB SRAM, 1KB EEPROM, an 8-channel 10-bit A/D converter, and a JTAG interface for on-chip debugging. The device supports a throughput of 16 MIPS at 16 MHz and operates between 4.5-5.5 volts. Package Include: 1 x ATmega8 IC

ATMEL 89C2051 IC The Atmel AT89C2051 IC is a low-voltage, high-performance CMOS 8-bit microcomputer with 2K bytes of Flash programmable and erasable read-only memory (PEROM). The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C2051 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications. The AT89C2051 provides standard features like 2K bytes of Flash, 128 bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five vector two-level interrupt architecture, a full duplex serial port, a precision analog comparator, on-chip oscillator and clock circuitry. In addition, the AT89C2051 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset. Pinout: Pinout Of ATMEL AT89C2051 IC Pinout Applications: Electronic Timers Temperature Control Systems Home Automation Robotics Automotive Applications