This paper reports a simple method for the integration of highly intricate conducting polymer electrodes into polymer microchips. We have previously made circuits from the conducting polymer, polyaniline, and used these as high voltage electrodes in microchip electrophoresis . The circuits were patterned via flash lithography in which unmasked regions of the polyaniline were welded into an insulating material upon exposure to a high intensity burst of light from a camera flash. A detailed examination of the welding allowed us to identify the wavelengths crucial for the welding, enabling the use of a diode laser for the fabrication of intricate polyaniline electrodes as small as 10 μm. Direct writing with the laser and a computer-controlled xy stage allowed the fabrication of electrodes for contactless conductivity detection. Furthermore, the non-linear relationship between electrode width and resistance enables the creation of non-linear voltage gradients, and when placed on a flexible substrate, the creation of dynamically variable resistors.