ARDUINO MEGA 2560 SPI PINS HOW TO

Serial.println(' Ping device failed to initialize!') Serial.println('Blue Robotics ping1d-simple.ino') Logfile.println('depth (mm), confidence (%)') only open a new file if it doesn't exist Serial.println('Card failed, or not present') see if the card is present and can be initialized: make sure that the default chip select pin is set to output, even if you don't use it: PinMode(53, OUTPUT) //set default SS as output

Static const uint8_t arduinoTxPin = 18 //Serial1 tx Static const uint8_t arduinoRxPin = 19 //Serial1 rx LiquidCrystal lcd(rs, en, d4, d5, d6, d7) I am not sure I understand fully when to be writing the pins to HIGH vs LOW, or if I need to make changes to the LCD or SD libraries to make sure the MISO line is not being held up by one of the slave devices. set 53 to LOW, set the slave CS to LOW, have slave device 1 perform an action, then set 53 and CS to High, then repeat this process for salve device 2).

ARDUINO MEGA 2560 SPI PINS HOW TO

In my code I have taken the advice I've found ( How to Connect Multiple SPI devices to an Arduino Microcontroller (), Daisy Chaining SPI on the Arduino Mega 2560 - Joshua Woehlke, Multiple SPI on Arduino MEGA 2650 - Using Arduino / Networking, Protocols, and Devices - Arduino Forum to call the default pin HIGH/ LOW in conjunction with calling the slave devices (i.e. Pin 53, the default CS/SS pin I have set as an OUTPUT. These are on the same port register, which is a different port register than pins 50-53. My understanding is that each 'slave' device needs its own chip select pin, which I have assigned SD to digital 46 and LCD to digital 49.

I have read through many forum posts and articles to understand the multiple SPI issue I'm experiencing when trying to add code which saves to the SD module. I know pins 50-53 are the MISO, MOSI, SCK and SS pins on the Mega and the LCD works alone to print the altimeter reading, so I know my connections are good. I also have an altimeter connected (working fine) and an LCD display (from the Arduino starter kit) which uses SPI. I have an Arduino Mega 2560 Rev3 stacked with a Gravity Expansion shield by DF Robot, which has a built in micro SD module.

Arduino mega 2560 spi pins