BBC Microbit + Secure Digital
I feel it is always good to save my code variables, so I can go back and debug or understand better the robot behaviour. Now progress into wireless communication, I still see the benefit of saving observations locally on the robots. Partly because if communication is lost, I still have a black-box taking readings. I also don't have a computer by the side of the lake to store observations.
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Sketch
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| // BBC Micro:bit writing to a Secure Digital (SD) device | |
| // Copyright (C) 2019 https://www.roboticboat.uk | |
| // e14977a4-9eaa-4740-a9e7-6dd329c255d8 | |
| // | |
| // This program is free software: you can redistribute it and/or modify | |
| // it under the terms of the GNU General Public License as published by | |
| // the Free Software Foundation, either version 3 of the License, or | |
| // (at your option) any later version. | |
| // | |
| // This program is distributed in the hope that it will be useful, | |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| // GNU General Public License for more details. | |
| // | |
| // You should have received a copy of the GNU General Public License | |
| // along with this program. If not, see <https://www.gnu.org/licenses/>. | |
| // These Terms shall be governed and construed in accordance with the laws of | |
| // England and Wales, without regard to its conflict of law provisions. | |
| #include <SPI.h> | |
| #include <SD.h> | |
| #define chipSelectCS 16 | |
| // CLK - pin 13 - Blue - Serial Clock managed by Micro:bit (Hardware pin) | |
| // MISO - pin 14 - Green - Master input, Slave output (Hardware pin) | |
| // MOSI - pin 15 - Purple - Master output, Slave input (Hardware pin) | |
| // CS - pin 16 - White - Chip Select - Slave selected from available slaves | |
| // VCC - v3.3 - Orange - Power supply | |
| // GND - ground - Black - Ground | |
| // Timer | |
| unsigned long mytime; | |
| void setup() | |
| { | |
| // Update the User | |
| Serial.begin(9600); | |
| Serial.println("Initializing SD card..."); | |
| // All SPI slaves are listening on the SPI | |
| // Pin to tell our SPI device we want to communicate with it | |
| pinMode(chipSelectCS, OUTPUT); | |
| // Set pin to low, meaning we want to send data to this slave | |
| digitalWrite(chipSelectCS, LOW); | |
| // Is the SD device working ok? | |
| if (!SD.begin(chipSelectCS)) | |
| { | |
| // SD device has a problem | |
| Serial.println("SD failed"); | |
| delay(1000); | |
| return; | |
| } | |
| } | |
| void loop() | |
| { | |
| // Update the time | |
| mytime = millis(); | |
| // Open the file to write to | |
| File dataFile = SD.open("datalog.txt", FILE_WRITE); | |
| // Was the file opened ok? | |
| if (dataFile) | |
| { | |
| // Write the time to the disk | |
| dataFile.println(mytime); | |
| //Close the file | |
| dataFile.close(); | |
| // Update User of progress | |
| Serial.println(mytime, DEC); | |
| } | |
| else | |
| { | |
| // File could not be opened. Error :-( | |
| // On PC, clear the contents of the datalog.txt and try again | |
| Serial.println("error opening datalog.txt"); | |
| delay(50); | |
| } | |
| } | |