I've been given the attached circuit to improve. The LED should light when a finger is placed across two contacts spaced around 1cm apart. However, the LED doesn't light with everyone's skin.
I have reduced the value of R2 from 150 Ohms to 47 Ohms which has slightly improved the sensitivity.
Is there anything else I can do to make the circuit work with anyone's skin?
Also, the brightness of the LED depends on the amount of pressure/skin resistance. Is there a way to just make the LED light up at full brightness when the contacts are touched and off when your finger is removed?
The circuit is powered from a CR2032 3V battery.
Thanks.
I have reduced the value of R2 from 150 Ohms to 47 Ohms which has slightly improved the sensitivity.
Is there anything else I can do to make the circuit work with anyone's skin?
Also, the brightness of the LED depends on the amount of pressure/skin resistance. Is there a way to just make the LED light up at full brightness when the contacts are touched and off when your finger is removed?
The circuit is powered from a CR2032 3V battery.
Thanks.