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I2C Between Arduinos: Maybe sometimes we want to share the workload of one Arduino with another. We will program one master Arduino to command the other slave Arduino to blink its built-in LED once Connect pins A4 and A5 on one Arduino to the same pins on the other one. Uno, Pro Mini A4 (SDA), A5 (SCL). use and i2c device together with a pro micro, I have to hook it up to pins two less digital pins compared to when using an arduino pro mini? When I would like to use I2C on Arduino pro mini, I have to use pull-ups on SDA Which pins should I define for the I2C communication on the Pro Mini? Include the Wire library ( #include ) and call Wire.begin(). 26 Jul 2016 Hello, i'm starting to play with a arduino pro mini (clone from china) i bought some time ago. Since it has digital pins, pwm control. analogue in The Arduino Pro Mini is a microcontroller board based on the ATmega328. Arduino Pro Mini projects featured from Arduino Project Hub, our tutorial platform: I2C, 1. Analog Input Pins, 6. External Interrupts, 2. DC Current per I/O Pin, 40 mA. In this tutorial, we'll go over how to set up and use the 3.3V Arduino Pro Mini, The pins on the short side are used for programming, they match up to the FTDI Hardware problem! The nodeMCU I'm using fails (mostly resets and garbage in the Serial Monitor) when inserted in the breadboard. That is. 20 Feb 2015 I am trying to send data from a Teensy 3.1 to an Arduino Pro Mini with Atmega328 processor. After the Wire library by default will enable internal pullup. teensy 3.1 i2c pins are 5v tolerant so level shifters are not needed. Serial TTL/FTDI FT232RL module (Just in an Arduino pro mini case) (2€-3€) LINK eBay 5. First of all we connect i2c pins module as shown in the schematic.