---
name: "tsl"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/tsl"
---

# tsl(4)

TAOS TSL2560/61 light sensor

## NAME

**tsl** – TAOS TSL2560/61 light sensor

## SYNOPSIS

**tsl\* at iic?**

## DESCRIPTION

The **tsl** driver provides support for the TAOS TSL2560/61 light-to-digital converters that transform light intensity into a digital signal output. These sensors contain a broadband photodiode and an infrared-responding photodiode allowing the ambient light level to be determined, as experienced by the human eye. This illuminance (in lux) is made available through the [sysctl(8)](/sysctl/8.md) interface and can, for example, be used to adjust the backlight of LCD screens to lighting conditions.

## SEE ALSO

[iic(4)](/iic/4.md), [intro(4)](/intro/4.md), [sensorsd(8)](/sensorsd/8.md), [sysctl(8)](/sysctl/8.md)

## HISTORY

The **tsl** driver first appeared in OpenBSD 3.9.

## AUTHORS

The **tsl** driver was written by Mark Kettenis ⟨*kettenis@openbsd.org*⟩.