![]() ![]() The chip has 3 address pins and can set 8 different addresses, so 8 modules can be connected through two IIC buses to achieve up to 128 IO extensions. MCP23S17 is a high-speed SPI interface, up to 10MHz. Here NodeMCU is acting as a master device and we are using Arduino UNO as a slave. The IO interface has a strong driving capacity, and the current and current can reach 25mA. Lets write an Arduino sketch of SPI communication for NodeMCU. To read more about Arduino and SPI, you can visit the Arduino & Serial Peripheral Interface (SPI) guide. These modes control whether data is shifted in and out on the rising or. This library is bundled with every Arduino platform (avr, megaavr, mbed, samd, sam, arc32), so you do not need to install the library separately. Serial Peripheral Interface (SPI) is a synchronous serial communication protocol. The chip is fully functional, each IO can be configured as input or output arbitrarily, and it can be used for color weaving to use pull-up resistors, and configured as input sub IO can enable interrupt function. This library allows you to communicate with SPI devices, with the Arduino as the controller device. This module is the 16 IO extension module of the SPI interface, and uses the MCP23S17 chip of MicroChip. 208211 speed controllers defined, 291 driving brushless motors, 299 SPI (Serial Peripheral Interface) about, 182, 421425 driving 7-segment displays. ![]()
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