Mcp23017 esp8266

That means that you only need pins (yes with Vcc and earth it makes 4) to control the chip and the added advantage is that you can share I2C with various other . Update: After I made this expander module, a ready made module with this chip has become available. So I actually would advice anybody needing a bit expander. You will then need to send commands to the device to initialise it and . For just about 1€ you get additional ports.

The point i am right now is the communication ok.

I can get the code below working. A couple of things you may want to look at: I was using chip address 0xinstead of 0xshown in your example, but the start . The number of GPIO pins on the ESP module can be expanded with a IO Expander. This way it becomes possible to control a channel relay board. Each individual pin can be used as either input or . Aanaput photoresistor from voltage divider. The reason why this is safe in this case is that on an I2C bus the clock and data lines are open-drain lines that are . The little chip with big dreams.

Funktioniert auf alles ganz gut, nur das der Pin 0xam Expander eine Art Interrupt auswirft sobald der Pin toggelt.

Kann man das irgendwo in der Lib ändern ? No GUI for the page isneed or included. I have mypifi Gpio extenders and want to use these with Gpio plugin but I am not sure firstly how to set these up in config and also where I add the address in conf. As we know the number of GPIOs for WeMos Mini and WeMos Dare only 1 we may require more GPIOs at our disposal. I tested it with Arduino IDE and . This IC can be used either with the Raspberry Pi or any I2C enabled Microcontroller for increasing the number of GPIO pins.

I suspect it might have something to do with pull up resistors. Daher habe ich eine etwas erweiterte Version der Platine erstellt. NodeLua and compatibles an extra digital.

John Boxall – a series of articles on the Arduino universe. The first chapter is here, the complete series is detailed here. Das läuft auch soweit alles recht stabil. How do I get the data from one wire Digital Temperature Sensor?

The data for each input or output is kept in the corresponding input or output register. Standard Male Headers for Board Interfacing.