![]() The Digispark is an ATtiny85 based microcontroller development board similar to the Arduino, only cheaper, smaller, and a bit less powerful. Step 6: Set up the ATTiny84 to work at 8Mhz for better compatibility with Arduino Libraries. ![]() The Digispark programs with a different procedure. Start by connecting the Arduino UNO to your PC. These are connected to the corresponding SDA / SCL pins at the MCP23017. ATtiny85 is an ideal shift register controller. ![]() Installing ATtiny support in older versions of Arduino. The SSD1306xLED library works with OLED display modules that use the I2C. Although hardware i2c may not be directly possible through software, the use of the other GPIO pins can be used for either a logic circuit to switch around the pull up resistor/green wire/whatever OR you can just use software i2c which is a lot easier to do. The DS3231 by Maxim is a "low-cost, extremely accurate I2C real-time clock (RTC) with an integrated temperature compensated crystal oscillator (TCXO) and crystal.
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