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The first board labelled "Arduino". Arduino USB [1] ATmega8 [52] 16 MHz Arduino 81.3 mm × 53.3 mm [ 3.2 in × 2.1 in ] USB FTDI FT232BM Arduino USB v2.0 Changed: USB replaces RS-232 interface, Improved: Arduino can be powered from host Arduino Extreme [1] ATmega8 [52] 16 MHz Arduino 81.3 mm × 53.3 mm [ 3.2 in × 2.1 in ] USB
Multi-Voltage Input/Output (MVIO) support on 3 or 4 pins on Port C; 4 Configurable Custom Logic (CCL) cells, 6 Event System channels; AVR EA-series. 8–64 KiB Flash; 28–48-pin package; internal 20 MHz oscillator; 24–32-channel 130 kS/s 12-bit differential Analog-to-Digital Converter (ADC) Programmable Gain Amplifier (PGA) with up to 16x gain
LED: There is a built-in LED driven by digital pin 13.When the pin is high value, the LED is on, when the pin is low, it is off. VIN: The input voltage to the Arduino/Genuino board when it is using an external power source (as opposed to 5 volts from the USB connection or other regulated power source).
If all inputs are high, each buffer will be in a high-impedance state and the pull-up resistor will pull the output high. But if any input is low, the output will be pulled low by the buffer for that input. This corresponds to wired AND in active-high logic, or to wired OR in active-low logic, and allows multiple inputs to share the same output ...
RP2040 is a 32-bit dual ARM Cortex-M0+ microcontroller integrated circuit [1] [2] [3] by Raspberry Pi Ltd. In January 2021, it was released as part of the Raspberry Pi Pico board. [ 1 ] Its successor is the RP2350 series.
The basic concept of the third state, high impedance (Hi-Z), is to effectively remove the device's influence from the rest of the circuit. If more than one device is electrically connected to another device, putting an output into the Hi-Z state is often used to prevent short circuits, or one device driving high (logical 1) against another device driving low (logical 0).
Here there is no virtual ground, and the steady op-amp output voltage is applied through R 1-R 2 network to the input source. The op-amp output passes an opposite current through the input source (it injects current into the source when the input voltage is positive and it draws current from the source when it is negative).
When at least one of the inputs is low, transistor V 1 is turned on, V 2 is turned off, V 3 is turned on and V 4 off, pulling output voltage high. When both inputs are high, V 2 is on, V 3 is off and V 4 is turned on, pulling output low. A digital use of a push–pull configuration is the output of TTL and related families.
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