![]() When I let D4 “float”, the LED turned on. When I grounded D4 on the Spark, the LED went out. On the arduino side, I used this code: #include īecause I used a 3.3V Arduino pro mini, I put an LED to ground via a resistor on digital pin 3. Also, note I removed the boolean on the last_state and made it an INT since that’s what digitalRead returns. Slowest Key Leetcode Solution The problem Slowest Key Leetcode Solution provides us. The original code was looking for a change in the button and would xmit that change to the slave. Keypad is a library for using matrix style keypads with the Arduino. ![]() The button “bebounce” that BDub suggested was great but that is not what was needed. First, as per timb, I made the Spark the master with this code: #include "application.h" The I2Cdev.h header also includes it if necessary. Here’s the code I’m running on the Core: #define LED D7Īny help would be greatly appreciated, thanks in advance.Įverything is working! However, there are a couple of things I had to fix. If youre using the Arduino Wire library, make sure you include Wire.h in your main sketch file. ![]() I have the code working between 2 Unos but not to the Core. The intension was to use this sketch to confirm I have the I2C communication working before using it in “real” applications. I have connections between D0 -> A4 and D1 -> A5, both with 4k7 pull-up resistors, GND -> GND and +5 -> Vin.įor now I’m just trying to press a switch on one board and have the on-board LED light on the other. If there is no software solution I will use a knife and soldering iron to put both devices on the same bus.I’m having some issues communicating between a Spark Core and an Arduino Uno via I2C. Alternative ideas? An I2C multiplexer probably isn't in the cards. Any suggestions about this error? The Wire.h file has a note that it was modified in 2020, so it is fairly recent.Ģ. Looking at Wire.h and Wire.cpp files, they both include the end() function. When I use it, I get a compiler error that "class TwoWire has no member named 'end'". To use the Wire library again after this, call Wire.begin() again." Sounds perfect., but. I tried using "Wire.end() " since that is supposed to "Disable the Wire library, reversing the effect of Wire.begin(). ![]() I can communicate fine with one or the other using Wire.begin(0,2) or Wire.begin(5,4), but have not been able to talk to both in the same sketch. The PCF & SSD1306 are on two different IC2 busses for some stupid reason. ![]() I have a commercial PCB with an ESP 12-F, PCF8563 Clock, and SSD1306 based OLED. ![]()
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