Connecting something to ground is DEFINITELY NOT a good way of checking, as you are likely to burn the output.
If you put 4.5V straight between B and E of a transistor, then it´s toast. Go get another one.
Connect it like this and see if the leds light up when you close the switch.
Then use a mulitmeter and measure the VOLTAGE coming off your sensor when activated and when not, and post back.
If you put 4.5V straight between B and E of a transistor, then it´s toast. Go get another one.
Connect it like this and see if the leds light up when you close the switch.
Then use a mulitmeter and measure the VOLTAGE coming off your sensor when activated and when not, and post back.
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