• Simple ambient light sensor
• Convert light to digital data with 8-bit resolution
• 6-pin Pmod port with SPI interface
• Small PCB size for flexible designs 0.8 in x 0.8 in (2.0 cm x 2.0 cm)

The Digilent PmodALS demonstrates light-to-digital sensing through a single ambient light sensor. Digilent engineers designed this Pmod around the Texas Instruments ADC081S021 analog-to-digital converter and Vishay Semiconductor's TEMT6000X01.

Functional Description

The PmodALS utilizes a single ambient light sensor (ALS) for user input. The amount of light the ALS is exposed to determines the voltage level passed into the ADC, which converts it to 8-bits of data. A value of 0 indicates a low light level and a value of 255 indicates a high light level.

Interfacing with the Pmod

The PmodALS communicates with the host board via the SPI protocol. Since the on-board analog-to-digital converter is a read-only module, the only wires in the SPI protocol that are required are the Chip Select, Master-In- Slave-Out, and Serial Clock lines.

Physical Dimensions

The pins on the pin header are spaced 100 mil apart. The PCB is 0.8 inches long on the sides parallel to the pins on the pin header and 0.8 inches long on the sides perpendicular to the pin header.