TSYS01 using SPI

Projects General Guidance
17

Try this in your setup so that all SPI devices are disabled:

pinMode(chipSelectPin, OUTPUT);
digitalWrite(chipSelectPin, HIGH);
pinMode(chipSelectPin2, OUTPUT);
digitalWrite(chipSelectPin2, HIGH);

Then all you need in the main loop is to wrap your SPI transactions like this:

digitalWrite(chipSelectPin, LOW);
// your SPI code
digitalWrite(chipSelectPin, HIGH);