Hi,
I'd like to build a row of 8 resistance touch sensors.
I am not that familiar with electronics so I started with a tutorial of how touch sensors work: **broken link removed**
This example worked very well and so I wanted to continue to a design with an IC housing 8 darlington circuits. I used the ULN2803A and (with 7 darlington circuits) the ULN2001A.
I connected the Pin1 (Input or Base) with two open cables (my touch sensor) and the other side to Vcc. Pin 18 (Output or Collector) I connected to an LED which was connected to Vcc, too. Pin9 was set to GND. However the whole thing does not work. I am not quite sure why but I think that the connected parts are right but the dimension of the resistors (R1 between my open cables and Vcc and R2 between the LED and Vcc) is not correct. I was trying to read the datasheet of the ICs but was not able to figure out what data is relevant to me. Can someone help?
Thanks
Sas
I'd like to build a row of 8 resistance touch sensors.
I am not that familiar with electronics so I started with a tutorial of how touch sensors work: **broken link removed**
This example worked very well and so I wanted to continue to a design with an IC housing 8 darlington circuits. I used the ULN2803A and (with 7 darlington circuits) the ULN2001A.
I connected the Pin1 (Input or Base) with two open cables (my touch sensor) and the other side to Vcc. Pin 18 (Output or Collector) I connected to an LED which was connected to Vcc, too. Pin9 was set to GND. However the whole thing does not work. I am not quite sure why but I think that the connected parts are right but the dimension of the resistors (R1 between my open cables and Vcc and R2 between the LED and Vcc) is not correct. I was trying to read the datasheet of the ICs but was not able to figure out what data is relevant to me. Can someone help?
Thanks
Sas