commit fb3bae10479303796616ed64fbdedc4bbacbc4e0
Author: James Devine <devine.jd@gmail.com>
Date:   Sat Oct 3 16:30:37 2015 +0200

diff --git a/HV set and ramp.ino b/HV set and ramp.ino
new file mode 100644
index 0000000..d07830e
--- /dev/null
+++ b/HV set and ramp.ino	
@@ -0,0 +1,62 @@
+//upwards voltage ramp from 40V to 68.8V, takes approx 60 seconds to reach
+//03 10 15 Jdevine
+#include <SPI.h>
+const int slaveAPin = 52;
+
+
+void setup() {
+pinMode (slaveAPin, OUTPUT);
+digitalWrite(slaveAPin, LOW);
+SPI.begin();
+
+ramp(0x69);
+}
+
+void loop()
+{
+  
+
+Serial.print("Looper");
+stepset(0x60);
+Serial.print("up");
+stepset(0x70);
+Serial.print("down");
+
+
+}
+
+
+void ramp(int target)
+{
+  //wait 100ms before ramp up
+int currentval=0xFF;  
+int difference = currentval - target;
+
+for(int i = 0; i < difference; i++)
+{
+digitalWrite(slaveAPin, LOW);
+SPI.beginTransaction(SPISettings(2000000, MSBFIRST, SPI_MODE0));
+//digitalWrite(slaveAPin, LOW);
+delay(200);
+SPI.transfer(currentval);
+delay(200);
+//digitalWrite(slaveAPin, HIGH);
+SPI.endTransaction();
+digitalWrite(slaveAPin, HIGH);
+currentval = currentval -1;
+}
+}
+
+void stepset(int target)
+{
+  digitalWrite(slaveAPin, LOW);
+SPI.beginTransaction(SPISettings(2000000, MSBFIRST, SPI_MODE0));
+//digitalWrite(slaveAPin, LOW);
+delay(300);
+SPI.transfer(target);
+delay(300);
+//digitalWrite(slaveAPin, HIGH);
+SPI.endTransaction();
+digitalWrite(slaveAPin, HIGH);
+}
+