Rob Dobson
Monitor for central heating system (e.g. 2zones+hw) Supports up to 15 temp probes (DS18B20/DS18S20) 3 valve monitors Gas pulse meter recording Use stand-alone or with nodeEnergyServer See http://robdobson.com/2015/09/central-heating-monitor
Dependencies: EthernetInterfacePlusHostname NTPClient Onewire RdWebServer SDFileSystem-RTOS mbed-rtos mbed-src
Diff: VoltAlerter.cpp
- Revision:
- 10:72eb217def1f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/VoltAlerter.cpp Sun Feb 22 20:23:43 2015 +0000
@@ -0,0 +1,34 @@
+// Detect stat of Volt-Alerter
+// Device produces a square wave when voltage detected
+// Cycle time of square wave around 100ms
+// Rob Dobson, 2015
+
+#include "VoltAlerter.h"
+
+VoltAlerter::VoltAlerter(PinName pinName) :
+ _inPin(pinName, PullUp)
+{
+ _curPinState = 0;
+ _consecutiveLows = 0;
+}
+
+void VoltAlerter::Service()
+{
+ // Check pin
+ if (!_inPin)
+ {
+ _curPinState = 1;
+ _consecutiveLows = 0;
+ return;
+ }
+
+ // Only set state low if we get X consecutive lows
+ _consecutiveLows++;
+ if (_consecutiveLows >= CONSECUTIVE_LOWS_REQD_FOR_LOW)
+ {
+ _curPinState = 0;
+ // The following is just to ensure the int doesn't overflow
+ _consecutiveLows = CONSECUTIVE_LOWS_REQD_FOR_LOW;
+ }
+}
+