Weathergadget

/*  USI SPI Slave Demo written by Robert Mollik, 2016
 *  
 *  This demo uses the SPI protocol with USI interface. This is necessary with with the smaller AVR controller since they don't 
 *  a complete SPI functionality. 
 *  Demo is written for the pinout of an Arduino Trinket and ATtiny85. Pins need to be modified if a different controller is used.
 *  
 *  The demo takes receives a request ID from the Master at the beginning of every communication. According to the request ID,
 *  it sends back either a temperature or a humidity values. Since both values are present in float, the 4 bytes of the float need
 *  to be send separately.
 */

Weathergadget

For ($Num = 1; $Num -le 12: $Num ++)
{   #Do stuff
}

Weathergadget

/*  USI SPI Slave Demo written by Robert Mollik, 2016
 *  
 *  This demo uses the SPI protocol with USI interface. This is necessary with with the smaller AVR controller since they don't 
 *  a complete SPI functionality. 
 *  Demo is written for the pinout of an Arduino Trinket and ATtiny85. Pins need to be modified if a different controller is used.
 *  
 *  The demo takes receives a request ID from the Master at the beginning of every communication. According to the request ID,
 *  it sends back either a temperature or a humidity values. Since both values are present in float, the 4 bytes of the float need
 *  to be send separately.
 */

Weathergadget

/*
 * 
 * Sketch to show how to get the single bytes out of a float variable and resemble them to a new variable with the original Value.
 * Can be used e. g. for the transfer via SPI, where only one byte at a time can be sent
 * 
 * Robert Mollik 2016
 * 
 * Created in the content of the development of my weather station and the need to tranfser values via SPI.
 * 
 */

Weathergadget

/*  SPI Master Demo written by Robert Mollik, 2016
 *  
 *  This demo uses the SPI protocol on a Arduino Uno R3 / ATmega8 controller
 *  
 *  The demo sends out a request ID depending, whether a temperature or humidity signal shall be obtained from the slave. Both signals 
 *  are datatype float, however get received as 4 bytes and need to be re-assembled.
 */


#define CS PC0                      // Chip select pin, any vacant portpin can be used