document how to build a solenoid driver and install a solenoid

* In contrast to the relay breakout board I was using before,
  the solenoid driver is HIGH-active, so some code had to be changed
  as well.

1 files changed, 2 insertions, 5 deletions

diff --git a/keyclick.h b/keyclick.h
index c7c7fd2..c88e313 100644
--- a/keyclick.h
+++ b/keyclick.h
@@ -38,13 +38,10 @@ extern enum keyclick_mode keyclick_mode;
 static inline void
 keyclick_solenoid_set(bool state)
 {
-	/*
-	 * NOTE: The solenoid/relay is LOW-active.
-	 */
 	if (state)
-	        PORTB &= ~(1 << PB3);
-	else
 		PORTB |= (1 << PB3);
+	else
+	        PORTB &= ~(1 << PB3);
 }
 
 #endif