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At Adafruit, they love the ATmega328, and they use it a lot for their own projects. The processor has many GPIO inputs, analog inputs, UART SPI and I2C, timer and PWM inputs in abundance - just enough for most simple projects. When they need a small size, they use a Pro Trinket 3V or 5V, but when the size is not as large, and a USB-to-serial converter is needed, they prefer a METRO Adafruit.
This is the METRO Adafruit with connectors. It comes with welded connectors. It is a fully assembled and tested board with through hole conncectors.
METRO is the culmination of years with AVRs: we wanted to make a development map that was easy to use and user-friendly for hackers. The core is an ATmega328P, with 32KB of flash and 2KB of RAM, running at 16 MHz
- Power the METRO with a polarity-protected 7-9V DC power supply or via the micro USB connector from any 5V USB source. The 2.1 mm DC plug has an on/off switch next to the DC plug, so you can easily turn off your configuration. The METRO switches automatically between USB and DC.
- METRO has 19 GPIO pins, of which 6 are Analog and 2 are reserved for the USB serial converter. There are also 6 PWM available on 3 timers (1 x 16 bits, 2 x 8 bits). There is a hardware SPI port, a hardware I2C port and a UART port from hardware to USB. The logic level is 5V, but by cutting and soldering a jumper closed, you can easily convert it to 3.3V logic
- USB to Serial Converter, there is a USB to Serial converter that can be used by any computer to listen/send data to METRO, and can also be used to launch and update code via bootloader
- Four LEDs on the front edge of the card for easy debugging. One green power LED, two RX/TX LEDs for the UART and one red LED connected to pin PB5
- Easy reprogramming, delivered preloaded with Optiboot bootloader, which is supported by avrdude and uses only 512 bytes.
- Works with all Adafruit shield!
We also provide 4 rubber pads to prevent it from slipping off your desk.
- ATmega328 microcontroller with Optiboot (UNO) Bootloader
- USB Programming and debugging via the well-supported genuine FTDI FT231X
- Input voltage: 7-9V (a 9VDC power supply is recommended)
- 5V regulator can supply peak ~800mA as long as the die temp of the regulator does not exceed 150*C
- 3.3V regulator can supply peak ~150mA as long as the die temp of the regulator does not exceed 150*C
- 5V logic with 3.3V compatible inputs, can be converted to 3.3V logic operation
- 20 Digital I/O Pins: 6 are also PWM outputs and 6 are also Analog Inputs
- 6-pin ICSP Header for reprogramming
- 32KB Flash Memory - 0.5K for bootloader, 31.5KB available after bootloading
- 16MHz Clock Speed
- Compatible with "Classic" and "R3" Shields
- Adafruit Black PCB with gold plate on pads
- 53mm x 71mm / 2.1" x 2.8"
- Height (w/ barrel jack): 13mm / 0.5"
- Weight: 19g
- Derivative of "Arduino UNO R3 Reference design"
- Open source hardware files on github!
|Micro-contôroleur - Horloge||16 MHz|
|Tension logique (GPIO)||3,3V et 5V|
|Alimentation limite||7V à 9V|
|Connectique pour chargement||micro USB|
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