Add temp var #417

Job	Run time
Build with PlatformIO (espgeigerhw)	1m 47s
Build with PlatformIO (espgeigerlog)	1m 47s
Build with PlatformIO (espgeigerlog_gc10next)	1m 44s
Build with PlatformIO (espgeigerlog_test)	1m 54s
Build with PlatformIO (esp32_pulse)	1m 59s
Build with PlatformIO (esp32_pulse_no_pcnt)	1m 53s
Build with PlatformIO (esp32_test)	1m 53s
Build with PlatformIO (esp32_testpulse)	1m 54s
Build with PlatformIO (esp32_test_gc10)	1m 56s
Build with PlatformIO (esp32_gc10)	2m 0s
Build with PlatformIO (esp8266_pulse)	1m 37s
Build with PlatformIO (esp8266_pulsemin)	1m 30s
Build with PlatformIO (esp8266_test)	1m 32s
Build with PlatformIO (esp8266_testpulse)	1m 40s
Build with PlatformIO (esp8266_test_gc10)	1m 34s
Build with PlatformIO (esp8266_gc10)	1m 33s
Build with PlatformIO (esp8266oled_gc10)	1m 46s
Build with PlatformIO (esp32oled_gc10)	1m 59s
Build with PlatformIO (esp8266oled_gc10next)	1m 45s
Build with PlatformIO (esp32oled_gc10next)	2m 2s
Build with PlatformIO (esp8266oled_pulse)	1m 34s
Build with PlatformIO (esp32_cajoe_iotgm)	2m 12s
	39m 31s

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