From 1ea32bbc49c1536810b7b22b35ba2101e45de1e6 Mon Sep 17 00:00:00 2001
From: alanbjohnston <alan.b.johnston@gmail.com>
Date: Mon, 27 Jul 2020 11:14:44 -0400
Subject: [PATCH] handle case where no battery is plugged into INA219 which
 reads < 1V

---
 afsk/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/afsk/main.c b/afsk/main.c
index 82835276..385bfcc7 100644
--- a/afsk/main.c
+++ b/afsk/main.c
@@ -550,7 +550,7 @@ while (loop-- != 0)
    #ifdef DEBUG_LOGGING
       fprintf(stderr,"INFO: Battery voltage: %f V  Battery Threshold %f V\n", batteryVoltage, batteryThreshold);
    #endif	 
-   if ((batteryVoltage > 0) && (batteryVoltage < batteryThreshold))
+   if ((batteryVoltage > 1.0) && (batteryVoltage < batteryThreshold)) // no battery INA219 will give 0V, no battery plugged into INA219 will read < 1V
    {
 	fprintf(stderr,"Battery voltage too low: %f V - shutting down!\n", batteryVoltage);
   	digitalWrite (txLed, txLedOff);