Abstract: A toy playset with a colorimeter and method of calibration is provided. The colorimeter may include the combination of a microcontroller with multiple switchable output ports, a light source connected to three of the output ports, and a photo transistor for sensing reflected light. The colorimeter may include four different resistors, each of the resistors connected to a corresponding additional one of the output ports, with the four different resistors connected in parallel to the photo transistor. The colorimeter may be programmed to cycle through the resistors and select a calibration based on a low predefined voltage target for reflection from a black surface and a higher predefined voltage target for reflection from a white surface. The light source is a RGB light source having a tri-band wavelength light.

Abstract: A toy playset with a colorimeter and method of calibration is provided. The colorimeter may include the combination of a microcontroller with multiple switchable output ports, a light source connected to three of the output ports, and a photo transistor for sensing reflected light. The colorimeter may include four different resistors, each of the resistors connected to a corresponding additional one of the output ports, with the four different resistors connected in parallel to the photo transistor. The colorimeter may be programmed to cycle through the resistors and select a calibration based on a low predefined voltage target for reflection from a black surface and a higher predefined voltage target for reflection from a white surface. The light source is a RGB light source having a tri-band wavelength light.