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--- arduino_uno [2022-12-18 00:50] – created asdf
+++ arduino_uno [2023-02-25 19:14] (current) – asdf
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 ====== Arduino Uno ======
-A microcontroller based around the ATmega328P chip.
+A microcontroller based around the ATmega328P chip. The processor is clocked at 16 MHz and features 2 KB SRAM, 32 KB of program flash storage, and 1 KB of user-writable EEPROM.
 {{ ::arduino-pinout.png?400 |}}
+With a 10-bit ADC over an operating range of 0--5 V, the analog input pins have a resolution of 4.9 mV. Digital I/O pins can supply a maximum of 20 mA.
+It appears from the documentation that the serial pins (0 and 1) are internally connected to the USB interface [(docs_serial)]. In order to use both USB and another serial device, the ''SoftwareSerial'' library is necessary. In any case, serial operation is at TTL levels (//not// RS-232).
+Pins A4 and A5 can also function as I2C SDA and SCL, respectively. The ''Wire'' library expects 7-bit addresses, so if given an 8-bit address, drop the least significant bit. Note also that the I2C buffer is 32 bytes; transmissions longer than this will be truncated [(docs_wire)].
+On the Uno, ints and shorts are 2 bytes; floats and doubles are 4 bytes.
+===== References =====
+[(docs_serial>https://www.arduino.cc/reference/en/language/functions/communication/serial/)]
+[(docs_wire>https://www.arduino.cc/reference/en/language/functions/communication/wire/)]
+{{tag>microcontroller "dev board"}}