Overview

Toggling a LED is the ultimate experience! 😄

This can be done viaGPIO pins.

General note

It is recommended to use the GPIO as a sink: plug the long lead (positive side)on the 3.3V rail, the short lead on a 220Ω resistor, which is itself connectedto the GPIO.

The reason is that most boards have an easier time to sink current than sourcecurrent.

Learn more

• LED on Wikipedia

Example

periph doesn’t expose anytoggle-like functionality on purpose, it is asstateless as possible.

packagemainimport("log""time""periph.io/x/conn/v3/gpio""periph.io/x/host/v3""periph.io/x/host/v3/rpi")funcmain(){// Load all the drivers:if_,err:=host.Init();err!=nil{log.Fatal(err)}t:=time.NewTicker(500*time.Millisecond)forl:=gpio.Low;;l=!l{// Lookup a pin by its location on the board:iferr:=rpi.P1_33.Out(l);err!=nil{log.Fatal(err)}<-t.C}}

This example uses basically no CPU: theOut() call above doesn’t call intothe kernel, unlike other Go hardware libraries. Instead itdirectly writes tothe GPIO memory mapped register.

Buying

LEDs are generally best bought in bulk (e.g. 200 LEDs in a bag).

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