fix #324 to enable more than one HallSensor #827

Job	Run time
lint	8s
Test compiling (arduino:avr:uno)	2m 39s
Test compiling (arduino:sam:arduino_due_x)	57s
Test compiling (arduino:avr:mega)	42s
Test compiling (arduino:avr:leonardo)	23s
Test compiling (arduino:samd:nano_33_iot)	1m 15s
Test compiling (adafruit:samd:adafruit_metro_m4)	2m 29s
Test compiling (esp32:esp32:esp32doit-devkit-v1)	4m 29s
Test compiling (esp32:esp32:esp32s2)	2m 51s
Test compiling (esp32:esp32:esp32s3)	3m 0s
Test compiling (STMicroelectronics:stm32:GenF1:pnum=BLUEPILL_F103C8)	3m 37s
Test compiling (STMicroelectronics:stm32:Nucleo_64:pnum=NUCLEO_F411RE)	7m 10s
Test compiling (STMicroelectronics:stm32:GenF4:pnum=GENERIC_F405RGTX)	3m 27s
Test compiling (STMicroelectronics:stm32:GenL4:pnum=GENERIC_L475RGTX)	8m 6s
Test compiling (STMicroelectronics:stm32:Disco:pnum=B_G431B_ESC1)	1m 52s
Test compiling (arduino:mbed_rp2040:pico)	1m 27s
	44m 32s

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